Search Result of Chinese Standard: 'GB/T 711-2017'
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Hot-rolled quality carbon structural steel plates sheets and strips
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Detail Information of GB/T 711-2017; GB/T711-2017
Description (Translated English): Hot-rolled quality carbon structural steel plates sheets and strips
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H46
Classification of International Standard: 77.140.50
Word Count Estimation: 9,954
Date of Issue: 2017-02-28
Date of Implementation: 2017-11-01
Older Standard (superseded by this standard): GB/T 710-2008; GB/T 711-2008
Quoted Standard: GB/T 222; GB/T 223.5; GB/T 223.12; GB/T 223.19; GB/T 223.23; GB/T 223.37; GB/T 223.59; GB/T 223.64; GB/T 223.68; GB/T 223.86; GB/T 224; GB/T 228.1; GB/T 229; GB/T 232; GB/T 247; GB/T 709; GB/T 2970; GB/T 2975; GB/T 4336; GB/T 6394; GB/T 8170; GB/T 13298
Drafting Organization: Chongqing Iron and Steel Co., Ltd., Anshan Iron and Steel Co., Ltd., Metallurgical Industry Information Standards Institute, Shougang Corporation, Xinyu Iron and Steel Co., Ltd., Hebei Iron and Steel Co., Ltd. Tangshan Branch
Administrative Organization: National Steel Standardization Technical Committee (SAC/TC 183)
Regulation (derived from): National Standard Announcement No. 4 of 2017
Proposing organization: China Iron and Steel Industry Association
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China, China National Standardization Administration Committee
Summary: This standard specifies the quality, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of hot rolled steel sheets and stripes for high quality carbon structural steels. This standard applies to the thickness of not more than 100 mm, the width of not less than 600 mm high-quality carbon structural steel hot-rolled steel and steel (hereinafter referred to as steel and steel).
GB/T 711-2017
Hot-rolled quality carbon structural steel plates sheets and strips
ICS 77.140.50
H46
National Standards of People's Republic of China
Replacing GB/T 711-2008, GB/T 710-2008
High quality carbon structural steel hot rolled steel plate and strip
Hot-roledqualitycarbonstructuralsteelplatessheetsandstrips
Published on.2017-02-28
2017-11-01 Implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration released
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard is for GB/T 710-2008 "High Quality Carbon Structural Steel Hot Rolled Steel Sheet and Strip" and GB/T 711-2008 "High Quality Carbon
"Structural steel hot-rolled thick steel plate and strip" was revised.
This standard replaces GB/T 710-2008 "High-quality carbon structural steel hot-rolled steel sheet and strip" and GB/T 711-2008 "High-quality carbon
Structural steel hot-rolled thick steel plates and strips, compared with the GB/T 710-2008 and GB/T 711-2008 standards, the main technical changes are as follows.
--- Abolition of boiling steel related brands;
--- Cancel the pull along the level;
--- Increase 35Mn, 55Mn, 70Mn three brands (see Table 1, Table 2, Table 3);
--- Control of harmful elemental sulfur in Yannan Steel (see Table 1);
--- Adjust the delivery status of some brands (see Table 2).
This standard is proposed by the China Iron and Steel Industry Association.
This standard is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).
This standard was drafted by. Chongqing Iron and Steel Co., Ltd., Anshan Iron and Steel Co., Ltd., Metallurgical Industry Information Standards Institute, Shougang General Manager
Division, Xinyu Iron and Steel Co., Ltd., Hebei Iron and Steel Co., Ltd. Tangshan Branch.
The main drafters of this standard. Du Dasong, Ye Guohua, Pu Zhimin, Zhang Weixu, Shi Li, Liao Sang Sang, Deng Cuiqing, Xie Chaozhong, Guan Jichun,
Yang Shuo, Gao Yan, Wang Xin, Liu Xuyuan, and Su Shi.
The previous versions of the standards replaced by this standard are.
---GB/T 710-1988, GB/T 710-1991, GB/T 710-2008;
--- GB/T 711-1985, GB/T 711-1988, GB/T 711-2008.
High quality carbon structural steel hot rolled steel plate and strip
1 Scope
This standard specifies the dimensions, shape, weight, technical requirements, test methods, and inspection rules for high-quality carbon structural steel hot-rolled steel plates and strips.
Packaging, marking and quality certificates.
This standard applies to high-quality carbon structural steel hot-rolled steel plates and strips with a thickness of not more than 100mm and a width of not less than 600mm (below
Abbreviated steel plate and strip).
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
Finished chemical composition tolerance of GB/T 222 steel
GB/T 223.5 Determination of acid-soluble silicon and total silicon content in steels-Reduced molybdosilicate spectrophotometric method
GB/T 223.12 Methods for chemical analysis of iron, steel and alloy - The separation of sodium carbonate - Diphenylcarbazine photometric method for the determination of chromium content
GB/T 223.19 Methods for chemical analysis of iron, steel and alloy - The neocuproine-chloroform extraction photometric method for the determination of copper content
GB/T 223.23 Determination of nickel content in steels and alloys Dibutyl oxime spectrophotometric method
GB/T 223.37 Methods for chemical analysis of iron, steel and alloy - The distillation and indigo blue photometric method for the determination of nitrogen content
GB/T 223.59 Determination of phosphorus content in steels and alloys - Phosphomolybdate blue spectrophotometric method and antimony-molybdenum blue spectrophotometric method
GB/T 223.64 Determination of manganese and steel alloys by flame atomic absorption spectrometry
GB/T 223.68 Methods for chemical analysis of iron, steel and alloy - The potassium iodate titration method for the determination of sulfur after combustion in a tubular furnace
GB/T 223.86 Determination of total carbon content of steels and alloys Infrared absorption after combustion in induction furnaces
Decarburized Depth Determination Method for GB/T 224 Steel
GB/T 228.1 Tensile test of metallic materials Part 1. Test method at room temperature
GB/T 229 Charpy pendulum impact test method for metal materials
GB/T 232 bending test method for metallic materials
GB/T 247 General requirements for steel plate and strip packaging, marking and quality certificates
GB/T 709 Hot Rolled Steel Plates and Strips Dimensions, Shapes, Weights and Permissible Deviations
GB/T 2970 thick steel plate ultrasonic inspection method
GB/T 2975 Steel and Steel Products Mechanical Properties Test Sampling Position and Sample Preparation
GB/T 4336 Carbon steel and low-alloy steel spark source atomic emission spectrometry analysis method (conventional method)
GB/T 6394 Average grain size of metal
GB/T 8170 Representation and Determination of Numerical Rounding Rules and Limit Values
GB/T 13298 metal microstructure inspection method
Evaluation Method of Microstructure of GB/T 13299 Steel
General technical requirements for the delivery of GB/T 17505 steel and steel products
GB/T 20123 Determination of Total Carbon and Sulfur Content in Iron and Steel, Infrared Absorption after Combustion in High Frequency Induction Furnace (Conventional Method)
Determination of multi-element content of GB/T 20125 low-alloy steel by inductively coupled plasma atomic emission spectrometry
GB/T 20066 Sampling and preparation methods for samples for the determination of chemical composition of steel and iron
3 Order contents
Contracts or orders placed under this standard should include the following.
a) product name (plate or strip);
b) standard number;
c) brand number;
d) delivery status;
e) size and precision;
f) edge status (EC or EM);
g) weight;
h) Special requirements.
4 size, shape, weight
The size, shape, weight and allowable deviation of steel plates and strips are to comply with the requirements of GB/T 709.
5 Technical requirements
5.1 Grades and Chemical Composition
5.1.1 Steel grades and chemical composition (melting components) shall comply with the requirements of Table 1.
Table 1 Grades and Chemical Composition
Grade
Chemical composition (mass fraction)/%
C Si Mn
PS Cr Ni Cu
no greater than
08 0.05~0.11 0.17~0.37 0.35~0.65 0.035 0.030 0.10 0.30 0.25
08Ala ≤ 0.11 ≤ 0.03 ≤ 0.45 0.035 0.030 0.10 0.30 0.25
10 0.07~0.13 0.17~0.37 0.35~0.65 0.035 0.030 0.15 0.30 0.25
15 0.12~0.18 0.17~0.37 0.35~0.65 0.035 0.030 0.20 0.30 0.25
20 0.17~0.23 0.17~0.37 0.35~0.65 0.035 0.030 0.20 0.30 0.25
25 0.22~0.29 0.17~0.37 0.50~0.80 0.035 0.030 0.20 0.30 0.25
30 0.27~0.34 0.17~0.37 0.50~0.80 0.035 0.030 0.20 0.30 0.25
35 0.32~0.39 0.17~0.37 0.50~0.80 0.035 0.030 0.20 0.30 0.25
40 0.37~0.44 0.17~0.37 0.50~0.80 0.035 0.030 0.20 0.30 0.25
45 0.42~0.50 0.17~0.37 0.50~0.80 0.035 0.030 0.20 0.30 0.25
50 0.47~0.55 0.17~0.37 0.50~0.80 0.035 0.030 0.20 0.30 0.25
55 0.52~0.60 0.17~0.37 0.50~0.80 0.035 0.030 0.20 0.30 0.25
60 0.57~0.65 0.17~0.37 0.50~0.80 0.035 0.030 0.20 0.30 0.25
Table 1 (continued)
Grade
Chemical composition (mass fraction)/%
C Si Mn
PS Cr Ni Cu
no greater than
65 0.62~0.70 0.17~0.37 0.50~0.80 0.035 0.030 0.20 0.30 0.25
70 0.67~0.75 0.17~0.37 0.50~0.80 0.035 0.030 0.20 0.30 0.25
20Mn 0.17~0.23 0.17~0.37 0.70~1.00 0.035 0.030 0.20 0.30 0.25
25Mn 0.22~0.29 0.17~0.37 0.70~1.00 0.035 0.030 0.20 0.30 0.25
30Mn 0.27~0.34 0.17~0.37 0.70~1.00 0.035 0.030 0.20 0.30 0.25
35Mn 0.32~0.39 0.17~0.37 0.70~1.00 0.035 0.035 0.25 0.30 0.25
40Mn 0.37~0.44 0.17~0.37 0.70~1.00 0.035 0.030 0.20 0.30 0.25
45Mn 0.42~0.50 0.17~0.37 0.70~1.00 0.035 0.035 0.25 0.30 0.25
50Mn 0.47~0.55 0.17~0.37 0.70~1.00 0.035 0.030 0.20 0.30 0.25
55Mn 0.52~0.60 0.17~0.37 0.70~1.00 0.035 0.035 0.25 0.30 0.25
60Mn 0.57~0.65 0.17~0.37 0.70~1.00 0.035 0.030 0.20 0.30 0.25
65Mn 0.62~0.70 0.17~0.37 0.90~1.20 0.035 0.030 0.20 0.30 0.25
70Mn 0.67~0.75 0.17~0.37 0.90~1.20 0.035 0.035 0.25 0.30 0.25
a The content of acid-soluble aluminum (Als) in steel is 0.015%~0.065% or the content of all aluminum (Alt) is 0.020%~0.070%.
5.1.2 Residual elements in steel Chromium, nickel, copper content Suppliers may not perform analysis if they can guarantee compliance.
5.1.3 The nitrogen content of the steel smelted by the oxygen converter shall not exceed 0.008%. The supplier can guarantee the qualification and may not perform the analysis.
5.1.4 The allowable deviation of chemical composition of finished steel plates and strips shall comply with the provisions of GB/T 222.
5.2 Smelting method
Steel is smelted by an oxygen converter or an electric furnace.
5.3 Delivery status
5.3.1 The steel strip and the shear steel plate are delivered in the hot rolled state. The delivery status of the single-rolled steel plate shall meet the requirements in Table 2.
5.3.2 Strips are usually delivered without trimming. The steel plate shall be delivered by trimming, agreed upon by the supplier and the buyer, and specified in the contract, or may not be trimmed.
delivery.
Table 2 Delivery status
Brand delivery status
08, 08Al, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 20Mn, 25Mn, 30Mn,
35Mn, 40Mn, 45Mn, 50Mn, 55Mn
Hot rolling or heat treatment
60, 65, 70, 60Mn, 65Mn, 70Mn Heat Treatment a
a After the agreement between supply and demand, it can also be delivered in hot rolled condition.
5.3.3 When steel plates and strips are delivered in pickled condition, pickled steel plates and strips are usually supplied with oil, and the oil film should be able to be removed with an aqueous alkali solution.
Under normal packing, transportation, handling, and storage conditions, the supplier guarantees that no rust will be generated within 3 months from the date of completion of production. When requested by the buyer,
Both parties need to negotiate and indicate in the contract that hot-rolled pickled surfaces can also be delivered without oiling.
Note. For the non-oiled products required by the buyer, the surface may be slightly scratched and rusted during transportation, handling, storage and use. When ordering, the demand side should be
inform.
5.4 Mechanical Properties
5.4.1 The mechanical properties of steel plates and strips are to comply with the requirements of Table 3.
Table 3 Mechanical properties
Grade
tensile strength
Rm/MPa
Elongation after fracture
A/%
not less than
08Al 325 33
55a 645 13
60a 675 12
Grade
tensile strength
Rm/MPa
Elongation after fracture
A/%
not less than
65a 695 10
70a 715 9
20Mn 450 24
25Mn 490 22
30Mn 540 20
35Mn 560 18
40Mn 590 17
45Mn 620 15
50Mn 650 13
55Mn 675 12
60Mna 695 11
65Mna 735 9
70Mna 785 8
Note. Heat treatment refers to normalizing, annealing or high temperature tempering.
a After agreement between the supply and demand sides, the single-rolled steel sheet can also be delivered in the hot-rolled state, and the mechanical properties can be measured with the heat-treated sample blank.
5.4.2 After negotiating between supply and demand sides, the mechanical properties of 45, 45Mn and above grades can be delivered according to actual values. The indexes in Table 3 are for reference only.
5.4.3 Allowable tensile strength ratios for steel sheets delivered in heat treated condition when the elongation rate is more than 2% (absolute value) higher than specified in Table 2
The regulation is reduced by 40 MPa.
5.4.4 When the thickness of the steel plate and the strip is greater than 20mm, the elongation after the 1mm increase in thickness is allowed to decrease by 0.25% (absolute value).
The total reduction of not more than 32mm shall not be greater than 2% (absolute), and the total reduction of thickness greater than 32mm shall not exceed 3% (absolute
value).
5.4.5 After the agreement between the supplier and the buyer, the steel with the thickness of not less than 6mm can be used for low temperature impact test at 20°C or -20°C. For steel plates of 10, 15 and 20
The energy absorbed by the impact shall comply with the requirements of Table 4. The test temperature shall be specified in the contract. The test temperature and impact absorption energy of other brands shall be
Party agreement.
Table 4 Impact test
Grade
Longitudinal V-shaped shock absorption energy, KV2/J
not less than
20°C -20°C
5.4.6 In addition to the temperatures listed in Table 4, the V-type shock absorption energy at other temperatures may be determined and the values shall be agreed by both parties.
5.4.7 Charpy (V-notch) shock absorption energy, calculated on the arithmetic average of 3 specimens, allowing a single value of one of the specimens
Table 4 has a low value, but it must not be less than 70% of the prescribed value.
5.4.8 If the above conditions are not satisfied, three more samples may be taken from the same sample product for testing. The average of six consecutive samples is not
If the value is lower than the specified value, two samples are allowed to fall below the specified value. However, only one sample that is lower than the specified value by 70% is allowed.
5.4.9 Charpy (V-notch) impact test for steel plates with a thickness of less than 12 mm shall be made with auxiliary specimens, >8 mm to <12 mm
The auxiliary sample size is 7.5mm x 10mm x 55mm, and the test result should be not less than 75% of the value specified in Table 4, 6mm~8mm steel
The plate auxiliary specimen size is 5mm x 10mm x 55mm, and the test result should not be less than 50% of the value specified in Table 4. Thickness less than 6mm
The steel plate is not subjected to impact tests.
5.5 Process Performance
The cold bending test of 08~35 steel shall meet the requirements in Table 5. If the supplier can guarantee the qualification, it may not be tested.
Table 5 Cold bending test
Grade
Cold bending test 180°
Steel plate thickness/mm
≤20 >20
Bending head diameter D
08, 08Al, 10 0 a
15 0.5a 1.5a
20 a 2a
25, 30, 35 2a 3a
5.6 Decarburization layer
After negotiations between supply and demand sides, 35 steel and steel plates and strips with higher carbon content can be tested for decarburization. The total delamination depth should not be greater than
2% of the actual thickness of the steel plate and strip.
5.7 Ultrasonic testing
After negotiation between supply and demand sides, the steel plate can be ultrasonically tested according to GB/T 2970. The testing standards and qualification levels should be specified in the contract.
5.8 Ribbon organization
After negotiation between supply and demand sides, when the thickness of the steel strip and sheared steel plate is not more than 3mm, the 15th and 20th grades can be used for strip-shaped tissue inspection.
Not more than 3 levels.
5.9 Grain size
After negotiations between the supplier and the buyer, when the thickness of the steel strip and the shear steel plate is not more than 3mm, the grain grades of the 08, 08Al, 10, 15, and 20 grades can be checked.
The grain size should be 6 or finer, and the grain size inhomogeneity should be within 3 consecutive different levels.
5.10 Surface quality
5.10.1 There shall be no visually visible stratification of steel plates and strips, and there shall be no cracks, bubbles, folds, inclusions, knots, and indentations on the surface of steel plates and strips.
Iron oxide skin, etc. have harmful effects on use.
5.10.2 Steel sheets and strips must not have thin oxide scales or rust that interfere with the inspection of surface defects and the degree of roughness is not greater than that of steel sheets and strips.
Degree of tolerance half of the pit, concave, scratches and other local defects, and should ensure that the minimum allowable thickness of steel plates and strips.
5.10.3 Local defects on the surface of steel plates and strips are allowed to be cleaned. The clean-up area should be smooth and free from corners, and the minimum allowable steel plates and strips should be ensured.
thickness.
5.10.4 During the continuous production of steel strips, local surface defects are not easy to find and remove, thus allowing delivery with defects, but with defects
The part must not exceed 6% of the total length of each strip.
5.10.5 Steel plates with a thickness of more than 30 mm are allowed to be flame-cut. However, the steel plates to be heat treated should be processed before heat treatment.
5.10.6 The surface quality characteristics of each level of steel strip and shear steel plates are to comply with the requirements of Table 6.
Table 6 Surface quality characteristics of steel plates and strips at various levels
Grade and Code Applicable Surface Treatment Features
Ordinary surface (FA)
Rolling surface
Pickled surface
The surface is allowed to have a pit or concave with a depth (or height) not exceeding half of the thickness tolerance of the strip
Surfaces, scratches and other minor, local defects, but should ensure that the minimum allowable thickness of steel plate and strip
Degree; Allows slight serration, partial uncut, under pickling, pickling, parking spots, etc.
Local defects
Higher surface (FB) pickling surface
The surface is allowed to have local defects that do not affect the formability, such as. minor scratches, slight indentations,
Slight pitting, slight roll printing and color difference, etc.; the surface is allowed to have slight inconspicuousness after oiling
Parking spot, does not allow the lack of pickling, pickling and other defects
6 Test methods
6.1 Chemical composition analysis method for steel according to GB/T 223.5, GB/T 223.12, GB/T 223.19, GB/T 223.23, GB/T 223.37,
GB/T 223.59, GB/T 223.64, GB/T 223.68, GB/T 223.86, GB/T 4336, GB/T 20123, GB/T 20125 or
The method shall be used, but ......
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