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GB 50410-2014: Code for design of rolling process of hot-rolled section and bar mill
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Code for design of rolling process of hot-rolled section and bar mill
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GB 50410-2014
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| GB 50410-2007 | English | 879 |
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Code for design of rolling process of hot-rolled small section and bar mill
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PDF similar to GB 50410-2014
Basic data | Standard ID | GB 50410-2014 (GB50410-2014) | | Description (Translated English) | Code for design of rolling process of hot-rolled section and bar mill | | Sector / Industry | National Standard | | Classification of Chinese Standard | P73 | | Classification of International Standard | 77.010 | | Word Count Estimation | 79,778 | | Date of Issue | 12/2/2014 | | Date of Implementation | 8/1/2015 | | Older Standard (superseded by this standard) | GB 50410-2007 | | Quoted Standard | GB 50009; GB 50010; GB 50011; GB 50015; GB 50016; GB 50017; GB 50019; GB 50028; GB 50029; GB 50034; GB 50037; GB 50046; GB 50050; GB 50057; GB 50058; GB 50108; GB 50187; GB 50191; GB 50195; GB 50406; GB 50414; GB 50493; GB 50603; GB 50632; GB 50696; GB 50 | | Regulation (derived from) | Housing and Urban-Rural Development Ministry Bulletin No. 586; Housing and Urban-Rural Development Ministry Bulletin No. 586 | | Issuing agency(ies) | Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China | | Summary | This standard applies to new construction and renovation of steel rolling project design. | GB 50410-2014: Code for design of rolling process of hot-rolled section and bar mill---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
1 General
1.0.1 In order to implement relevant national laws, regulations, guidelines and policies in the construction of section steel rolling projects, to achieve safety, reliability, environmental protection and energy saving, advanced technology, and economical rationality, this specification is formulated.
1.0.2 This specification is applicable to the design of new and reconstructed section steel rolling projects.
1.0.3 In addition to implementing this specification, the engineering design of section steel rolling should also comply with the current relevant national standards.
2 terms
2.0.1 Hot-rolled section steels
It generally refers to long strips of hot-rolled steel with specific cross-sectional shapes and sizes, and is the main type of steel that is different from strips and steel pipes.
2.0.2 continuous rolling mill
There are no reversible and reciprocating rolling passes, the racks are basically arranged in-line, and the rolling stock may be rolled simultaneously between two or more racks, which can be divided into full continuous arrangement and unrolling continuous arrangement. layout.
2.0.3 Semi-continuous rolling mill with semi-continuous arrangement
The rough rolling mill or billet rolling mill adopts reversible or reciprocating rolling method, and the middle and finishing rolling mills are continuous rolling mills.
2.0.4 Tandem arrangement rolling mills arranged in succession
The billet rolling mill, intermediate rolling mill and finishing mill are arranged in tandem, and both the billet mill and the intermediate rolling mill adopt reversible rolling.
2.0.5 multiple single-stand reversing mill
The whole line adopts multiple rolling mills, and each rolling mill is rolled separately.
3 Basic Regulations
3.0.1 The engineering design of section steel rolling should actively adopt advanced and reliable new technology, new process and new equipment.
3.0.2 In addition to special steel types, continuous casting slabs should be used as blanks in the engineering design of section steel rolling.
3.0.3 The continuous casting slab hot delivery and hot charging process should be adopted for the engineering design of section steel rolling.
3.0.4 It is strictly forbidden to adopt the production technology and equipment eliminated by the state in the design of section steel rolling engineering.
3.0.5 The design output of the section steel rolling project should reach an economical production scale, and the annual effective working time and load rate of the rolling mill should be reasonably determined. The main technical and economic indicators of the workshop should reach the domestic advanced level, and the energy consumption of the process should meet the relevant provisions of the current national standard "Code for Energy Conservation Design of Iron and Steel Enterprises" GB 50632.
3.0.6 The technological equipment capabilities of the section steel rolling workshop should match each other to ensure smooth and stable production process, meet the production requirements of the product outline, and the product quality should meet the current relevant national standards.
3.0.7 The level of electrical transmission and automation equipment in the section steel rolling workshop should be compatible with the production process and the equipment level of the production unit.
3.0.8 The fire protection design of section steel rolling works shall comply with the relevant provisions of the current national standard "Code for Fire Protection Design of Buildings" GB 50016 and "Code for Fire Protection Design of Iron and Steel Metallurgical Enterprises" GB 50414.
4 small section steel
4.1 Production scale and products
4.1.1 The production scale of the new small section steel production line shall meet the following requirements.
1 For a production line whose main product is small-sized section steel, the designed annual output should not be less than 250,000 t.
2 For a production line with alloy steel as the main steel type, the designed annual output should not be less than 300,000 tons.
3 For production lines with ordinary quality non-alloy steel and ordinary quality low-alloy steel as the main steel types, the designed annual output should not be less than 500,000 tons.
4.1.2 The division of product varieties should meet the following requirements.
1 Small-sized round steel, square steel, flat steel, hexagonal steel, octagonal steel and other simple section steels should be classified as small bars.
2 Ribbed steel bars and plain steel bars should be classified as steel bars.
3 Sectional steels with complex sections such as small-sized angle steels and channel steels should be classified into small-sized shaped steels.
4.1.3 The specification range of main varieties should meet the following requirements.
1 Bars should be round steel with a diameter of 8 mm to 50 mm and square steel, hexagonal steel, octagonal steel, (5 to 20) mm × (30 to 100) mm flat steel with corresponding cross-sections;
2 The diameter of steel bar should be 8mm~50mm;
3 The angle steel should be 2.5
4.2 Blank
4.2.1 The production line shall use continuous casting slabs as blanks, and for some special steel types, rolled or forged slabs may be used as blanks.
4.2.2 The section of the billet should meet the following requirements.
1 The section of the billet should be determined according to factors such as the steel type, specification and application of the product.
2 The section of non-alloy steel and low-alloy steel billet should be 130mm×130mm～165mm×165mm.
3 The section of the alloy steel billet should be 150mm×150mm～200mm×200mm.
4.2.3 The length of the billet should be 6m~12m.
4.2.4 The blank quality should meet the following requirements.
1 The quality of continuous casting slabs should comply with the relevant provisions of the current industry standard "Continuous Casting Billets and Rectangular Billets" YB/T.2011, and the quality of rolled slabs should comply with the current industry standards "Size, shape, weight and allowable deviation of hot-rolled billets" Relevant provisions of YB/T 002.
2 The billet quality should meet the steel rolling production requirements.
3 The necessary inspection and cleaning of billets should be completed in the pre-rolling process.
4.3 Production process
4.3.1 The layout of the rolling mill shall be in the form of full continuous or unrolling continuous layout according to the product variety, specification and rolling speed.
When using large-section blanks to produce alloy steel small bars, it is advisable to adopt the continuous arrangement of head off.
4.3.2 The rolling process shall meet the following requirements.
1 The alloy steel production line should be equipped with a high-pressure water descaling device behind the furnace.
2.Set the corresponding starting rolling temperature and control the finishing rolling temperature according to different steel grades.
3 The maximum rolling speed should be determined according to the product variety, specification and output.
4 The rough and intermediate rolling mills should adopt the micro-tension rolling process; the small-sized section steel production line and the high-speed bar production line finishing mill should adopt the micro-tension rolling process, and the finishing mills of the other production lines should adopt the no-tension rolling process.
5 The small alloy steel bar production line should be equipped with a reducing and sizing unit and an online caliper.
6.Flying shears should be installed after the rough rolling unit, intermediate rolling unit, finishing rolling unit and reducing and sizing unit.
7.Controlled rolling and controlled cooling process should be adopted.
4.3.3 The finishing process shall meet the following requirements.
1 Sampling, cooling, cutting to length, inspection, short length removal, counting, bundling, weighing, marking and other processes should be set up for the finishing of straight bars and steel bars. Straight bars should adopt conventional cooling or slow cooling process as required.
2 Sampling, cooling, straightening, cutting to length, inspection, resizing, stacking, bundling, weighing, marking and other processes should be set up for the finishing of small-sized section steel.
3 Coiling, cooling, inspection, sampling, bundling, weighing, marking and other processes should be set up for the finishing of coiled bars and steel bars.
4 Alloy steel bar production line should be equipped with heat treatment process as required.
5 The off-line finishing of the alloy steel bar production line should be equipped with processes such as shot blasting, straightening, chamfering, flaw detection, inspection, bundling, weighing, marking, peeling, grinding, and resizing.
6 The product packaging shall comply with the relevant requirements of the current national standard GB/T 2101 "General Provisions on Section Steel Acceptance, Packaging, Marking and Quality Certificate".
4.4 Process operation equipment
4.4.1 Alloy steel production line should use walking furnace, non-alloy steel and low alloy steel production line should adopt walking furnace.
4.4.2 The equipment in the rolling mill area shall meet the following requirements.
1 The rolling mill should consist of a rough rolling unit, an intermediate rolling unit and a finishing rolling unit. The alloy steel rolling mill can be equipped with a pre-finishing rolling unit and a reducing and sizing unit.
2.Short stress line rolling mills should be used for roughing and intermediate rolling mills; cantilever ring rolling mills should be used for finishing mills in high-speed bar production lines, and short stress line rolling mills should be used for finishing mills in other production lines.
3 The reducing and sizing mill can adopt two-roll or three-roll mills.
4 The bar rolling mill should adopt horizontal/vertical layout alternately. According to the product variety, an appropriate number of horizontal/vertical convertible racks can be set.
5 Flying shears should choose the corresponding structural form according to the section size of the rolled piece and the range of rolling speed.
6 The cooling bed should adopt the stepping rack type.
4.4.3 The equipment in the finishing area shall meet the following requirements.
1.Fixed cold shears and flying cold shears can be used for cutting and sizing equipment, and cold saws can be used for steel products with special requirements.
2 For the production line that mainly uses small-sized section steel, it is advisable to use a roller straightening machine for long-length online straightening.
3 Alloy steel bar production line should be equipped with off-line inclined roll straightening machine.
4 The bar and steel bar production line should be equipped with a finished product counting device.
5.Finished product weighing device should be set up.
4.5 Working system, working hours and load rate
4.5 Working system, working hours and load rate
4.5.1 The small section steel workshop shall adopt the continuous working system.
4.5.2 The annual prescribed working time of the workshop should be 7600h/a~8000h/a, and the annual rated working time of the workshop should be 6200h/a~7200h/a. The lower limit should be taken for small section steel workshops mainly made of alloy steel; the upper limit should be taken for small section steel workshops with ordinary quality non-alloy steel and ordinary quality low alloy steel as the main steel types; the lower limit should be taken for profile workshops; upper limit.
4.5.3 The load rate of the rolling mill should not be lower than 85%.
4.6 Workshop layout
4.6.1 The rolling workshop should be adjacent to the continuous casting workshop.
4.6.2 The process layout of the workshop shall meet the requirements of the production process, with smooth flow, reasonable layout and convenient operation; for the workshop reserved for development, the layout of equipment and facilities shall be reserved.
4.6.3 The arrangement of equipment should be compact, and there should be room for equipment installation, operation, maintenance and safe passage.
4.6.4 The workshop should be equipped with lifting and transporting equipment.
4.6.5 The elevation of the rail surface of the crane in the main workshop shall take into account the equipment height, equipment maintenance requirements, stacking capacity and transportation conditions of blanks and finished products.
4.6.6 The main electrical room should be arranged on the transmission side of the rolling mill. When the production line is long or the facilities are scattered, several electrical rooms can be arranged in different areas nearby.
4.6.7 The roll room should be close to the main span and should be arranged on the operating side of the rolling mill.
4.6.8 The area of blank warehouse, intermediate warehouse and finished product warehouse should ensure the normal production needs. The storage days of blank storage should be 5d~7d, the storage days of intermediate storage in finishing area should be 3d~4d, and the storage days of finished products should not be less than 7d..
5 medium section steel
5.1 Production scale and products
5.1.1 The designed annual output of a new medium-sized steel production line should not be less than 500,000 tons.
5.1.2 The product variety should be medium-sized H-shaped steel, T-shaped steel, I-shaped steel, channel steel, equilateral angle steel, unequal angle steel, L-shaped steel, U-shaped steel, spherical flat steel, light rail, wheel rim steel and other special-shaped section steel.
5.1.3 The specification range of main varieties should meet the following requirements.
1 H-shaped steel should meet the following requirements.
1) The wide flange H-shaped steel should be HW100×100～HW200×200;
2) The H-shaped steel of the middle flange should be HM150×100～HM300×200;
3) H-shaped steel with narrow flange should be HN100×50～HN400×200;
4) Thin-walled H-shaped steel should be HT100×50～HT400×200;
2 T-shaped steel should meet the following requirements.
1) Wide flange split T-shaped steel should be TW50×100～TW100×200;
2) The split T-shaped steel of the middle flange should be TM75×100～TM150×200;
3) The narrow flange split T-shaped steel should be TN50×50～TN200×200;
3 I-beam should be 10
11 The rim steel should be 5.50F~8.5B.
5.2 Blank
5.2.1 The production line should use continuous casting slabs as blanks.
5.2.2 The section of the billet should meet the following requirements.
1 The cross section of billet should be determined according to factors such as product variety, specification and rolling mill layout.
2 The section of the billet should be a rectangular billet or a special-shaped billet.
5.2.3 The length of the blank should be greater than 4m, and the length of the blank should be determined according to the final length of the product.
5.2.4 The blank quality should meet the following requirements.
1 The quality of continuous casting rectangular billets shall comply with the relevant provisions of the current industry standard "Continuous Casting Steel Billets and Rectangular Billets" YB/T.2011.
2 The billet quality should meet the steel rolling production requirements.
3 The necessary inspection and cleaning of billets should be completed in the pre-rolling process.
5.3 Production process
5.3.1 The layout of the rolling mill shall meet the following requirements.
1 The layout of the rolling mill should be selected according to the product variety, specification, production scale and investment scale, such as continuous type, semi-continuous type, tandem type or multi-stand single arrangement.
2 The production line whose main specifications are close to the lower limit should be arranged in a continuous way with heads off.
3 The production line with specifications close to the upper limit should adopt semi-continuous, tandem or multi-rack separate arrangement.
5.3.2 The rolling process should meet the following requirements.
1 A high-pressure water descaling device should be installed behind the furnace.
2.Set the corresponding starting rolling temperature and control the finishing rolling temperature according to different steel grades.
3 The maximum rolling speed should be determined according to product variety, specification, output and rolling mill layout.
4 A profiler can be installed at the exit of the finishing mill.
5 A quick cooling device can be installed after the finishing mill.
5.3.3 The finishing process shall meet the following requirements.
1 Processes such as sampling, cooling, straightening, cutting to length, inspection, resizing, automatic stacking, bundling, weighing, and marking should be set up.
2 It is advisable to adopt the long length finishing process of long length cooling-long length straightening-cold sawing to length.
3 The product packaging shall comply with the relevant provisions of the current national standard GB/T 2101 "General Provisions on Section Steel Acceptance, Packaging, Marking and Quality Certificate".
5.4 Process operation equipment
5.4.1 The heating furnace should adopt walking type.
5.4.2 The equipment in the rolling mill area shall meet the following requirements.
1 The composition of the rolling mill should be determined according to the billet section, product variety, specification, output and other factors.
2 The rolling mill should adopt quick roll changing device.
3 Hot shears should be installed after the rough rolling unit/billet opening mill, and flying shears or hot saws can be installed after the finishing rolling unit.
4 The cooling bed should adopt walking beam type, walking rack type or walking beam/chain combined type.
5.4.3 The finishing area equipment should meet the following requirements.
1 A roller leveler should be used.
2 The cut-to-length cold saw machine should use metal saws.
3 It is advisable to set up inspection and scrap removal benches.
4 An automatic palletizer should be set up.
5 It is advisable to set up an automatic strapping machine.
6.Finished product weighing device should be set up.
7 The collection platform should be equipped with a steel turning device.
5.5 Working system, working hours and load rate
5.5.1 The medium section steel workshop shall adopt the continuous working system.
5.5.2 The annual prescribed working time of the workshop should be 7600h/a~8000h/a, and the annual rated working time of the workshop should be 6000h/a~6500h/a. The upper limit is taken for medium-sized steel workshops with relatively single product varieties, and the lower limit is taken for medium-sized steel workshops with many product varieties and specifications.
5.5.3 The load rate of the rolling mill should not be lower than 80%.
5.6 Workshop layout
5.6.1 The rolling workshop should be adjacent to the continuous casting workshop.
5.6.2 The process layout of the workshop shall meet the requirements of the production process, with smooth flow, reasonable layout and convenient operation; for the workshop reserved for development, the layout of equipment and facilities shall be reserved.
5.6.3 The arrangement of equipment should be compact, and there should be room for equipment installation, operation, maintenance and safe passage.
5.6.4 The workshop should be equipped with lifting and transporting equipment.
5.6.5 The elevation of the rail surface of the crane in the main workshop shall take into account the equipment height, equipment maintenance requirements, stacking capacity and transportation conditions of blanks and finished products.
5.6.6 The main electrical room should be arranged on the transmission side of the rolling mill. When the production line is long or the facilities are scattered, several electrical rooms can be arranged in different areas nearby.
5.6.7 The roll room should be close to the main span and should be arranged on the operating side of the rolling mill.
5.6.8 The area of the blank warehouse and the finished product warehouse should meet the normal production needs. The storage days for blanks should be 5 days to 7 days, and the storage days for finished products should not be less than 7 days.
6 medium bars
6.1 Production scale and products
6.1.1 The designed annual output of the new medium-sized bar production line should not be less than 500,000 tons. When the products are mainly high-alloy steel, the designed annual output can be appropriately reduced.
6.1.2 The product variety should be medium-sized round steel, square steel, flat steel, hexagonal steel, octagonal steel, square (round) billet and other simple section steel.
6.1.3 The specification range of main varieties should meet the following requirements.
1 The diameter of round steel should be 40mm~110mm;
2 The side length of square steel should be 40mm~110mm;
3 Flat steel should be (18~60)mm×(80~150)mm;
4 Six (eight) angle steels should be 40mm~110mm.
6.2 Blank
6.2.1 The production line shall use continuous casting slabs as blanks, and for some special steel types, rolled or forged slabs may be used as blanks.
6.2.2 The section of the billet should meet the following requirements.
1 The section of the billet should be determined according to factors such as the steel type, specification and application of the product.
2 The section of billet should be square billet or rectangular billet.
6.2.3 The length of the billet should be 6m~12m.
6.2.4 The blank quality should meet the following requirements.
1 The quality of continuous casting slabs should comply with the relevant provisions of the current industry standard "Continuous Casting Steel Billets and Rectangular Billets" YB/T.2011, and the quality of rolled slabs should comply with the current industry standards "Size, Shape, Weight and Permissible Deviation of Hot-Rolled Steel Billets" Relevant provisions of YB/T 002.
2 The billet quality should meet the steel rolling production requirements.
3 The necessary inspection and cleaning of billets should be completed in the pre-rolling process.
6.3 Production process
6.3.1 The layout of the rolling mill should be in the form of continuous head-off arrangement.
6.3.2 The rolling process shall meet the following requirements.
1 A high-pressure water descaling device should be installed behind the furnace.
2.Set the corresponding starting rolling temperature and control the finishing rolling temperature according to different steel grades.
3 The maximum rolling speed should be determined according to the product variety, specification and output.
4 The continuous rolling unit shall adopt the non-twist and micro-tension rolling process.
5.It is advisable to set up a reducing and sizing unit and an online caliper.
6.Flying shears should be installed after the rough rolling unit, intermediate rolling unit, finishing rolling unit and reducing and sizing unit.
7.Controlled rolling and controlled cooling process should be adopted.
6.3.3 The finishing process shall meet the following requirements.
1 On-line finishing should be equipped with procedures such as sampling, conventional cooling or slow cooling, cutting to length, inspection, short length removal, counting, bundling, weighing, and marking.
2 The heat treatment process should be set according to the needs.
3 Off-line finishing should be equipped with processes such as shot blasting, straightening, chamfering, flaw detection, inspection, bundling, weighing, marking, peeling, grinding, and recalibration.
4 The product packaging shall comply with the relevant provisions of the current national standard GB/T 2101 "General Provisions on Section Steel Acceptance, Packaging, Marking and Quality Guarantee".
6.4 Process operation equipment
6.4.1 The heating furnace should adopt walking type.
6.4.2 The equipment in the rolling mill area shall meet the following requirements.
1 The rolling mill should be composed of rough rolling unit, intermediate rolling unit, finishing rolling unit and reducing and sizing unit.
2 Rough, medium and finish rolling mills should adopt short stress line rolling mills.
3 Two-roll or three-roll mills can be selected for reducing and sizing mills.
4 Flying shears should choose the corresponding structural form according to the section size of the rolled piece and the range of rolling speed.
5 The cooling bed should adopt the stepping rack type.
6.4.3 The finishing area equipment should meet the following requirements.
1 The equipment for cutting to length shall adopt fixed cold shears and cold saws.
2 It is advisable to set up a high-precision two-roller straightening machine.
3 Surface flaw detection and internal flaw detection equipment should be installed.
4 Other finishing and heat treatment equipment should be configured according to relevant procedures.
6.5 Working system, working hours and load rate
6.5 Working system, working hours and load rate
6.5.1 The continuous working system shall be adopted in the medium-sized bar workshop.
6.5.2 The annual prescribed working time of the workshop should be 7600h/a~8000h/a, and the annual rated working time of the workshop should be 6200h/a~6800h/a.
6.5.3 The load rate of the rolling mill should not be lower than 80%.
6.6 Workshop layout
6.6.1 The rolling workshop should be adjacent to the continuous casting workshop.
6.6.2 The process layout of the workshop shall meet the requirements of the production process, with smooth flow, reasonable layout and convenient operation; for the workshop reserved for development, the layout of equipment and facilities shall be reserved.
6.6.3 The arrangement of equipment should be compact, and there should be room for equipment installation, operation, maintenance and safe passage.
6.6.4 The workshop should be equipped with lifting and transporting equipment.
6.6.5 The elevation of the rail surface of the crane in the main workshop shall take into account the equipment height, equipment maintenance requirements, stacking capacity and transportation conditions of blanks and finished products.
6.6.6 The main electric room should be arranged on the transmission side of the rolling mill. When the production line is long or the facilities are scattered, several electric rooms can be arranged in different areas nearby.
6.6.7 The roll room should be close to the main span and should be arranged on the operating side of the rolling mill.
6.6.8 The area of blank warehouse, intermediate warehouse and finished product warehouse should ensure the normal production needs. The storage days of blank storage should be 5d~7d, the storage days of intermediate storage in finishing area should be 3d~4d, and the storage days of finished products should not be less than 7d..
7 large section steel
7.1 Production scale and products
7.1.1 The designed annual output of a new large-scale section steel production line should not be less than 700,000 tons, and the designed annual output of a production line with many varieties and a wide range of specifications can be appropriately reduced.
7.1.2 The product variety should be large-scale H-shaped steel, I-shaped steel, channel steel, equilateral angle steel, unequal angle steel, L-shaped steel, U-shaped steel, spherical flat steel, steel rail, steel sheet pile, 310 B-shaped steel, T-shaped steel, Track steel and other special-shaped section steel.
7.1.3 The specification range of main varieties should meet the following requirements.
1 H-shaped steel should meet the following requirements.
1) The wide flange H-beam should be HW250×250～HW500×500;
2) The H-shaped steel of the middle flange should be HM300×200～HM600×300;
3) H-shaped steel with narrow flange should be HN350×175～HN1000×300;
2 I-beam should be 30
1 The quality of continuous casting rectangular billet should meet the current industry...
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