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GB 24512.1-2009: [GB/T 24512.1-2009] Seamless steel tubes and pipes for nuclear power plant -- Part 1: Carbon steel seamless tubes and pipes
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Basic data | Standard ID | GB 24512.1-2009 (GB24512.1-2009) | | Description (Translated English) | [GB/T 24512.1-2009] Seamless steel tubes and pipes for nuclear power plant -- Part 1: Carbon steel seamless tubes and pipes | | Sector / Industry | National Standard | | Classification of Chinese Standard | H48 | | Classification of International Standard | 77.140.75 | | Word Count Estimation | 23,299 | | Date of Issue | 2009-10-30 | | Date of Implementation | 2010-06-01 | | Quoted Standard | GB/T 222; GB/T 223.5; GB/T 223.9; GB/T 223.11; GB/T 223.12; GB/T 223.14; GB/T 223.16; GB/T 223.18; GB/T 223.23; GB/T 223.26; GB/T 223.29; GB/T 223.31; GB/T 223.40; GB/T 223.50; GB/T 223.53; GB/T 223.54; GB/T 223.58; GB/T 223.59; GB/T 223.60; GB/T 223.62; GB/T 223.63; GB/T 223.64; GB/T 223.67; GB/T 223.68; GB/T 223.69; GB/T 223.71; GB/T 223.72; GB/T 223.76; GB/T 223.78; GB/T 224; GB/T 226; GB/T 228; GB/T 229; GB/T 232; GB/T 241; GB/T 242; GB/T 246; GB/T 1979; GB/T 2102; GB/T 2975; GB/T 4336; GB/T 4338; GB/T 5777-2008; GB/T 6394; GB/T 7735; GB/T 10561; GB/T 12606; GB/T 13298; GB/T 15822; GB/T 17395; GB/T 17505; GB/T 20066; GB/T 20123; GB/T 20125; GB/T 20490; JB/T 4730.5; YB/T 4149; YB/T 5137 | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 12 of 2009 (No. 152 overall) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This Chinese standard specifies the nuclear power plant with carbon steel pipe joints classification code, size, shape, weight and tolerances, technical requirements, test methods, inspection rules, packaging, marking and quality reports. This standard applies to the manufacture of 1, 2, 3 -level nuclear and non-nuclear grade cable equipment pressure parts carbon steel pipe joints. | GB 24512.1-2009: [GB/T 24512.1-2009] Seamless steel tubes and pipes for nuclear power plant -- Part 1: Carbon steel seamless tubes and pipes
---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.
Seamless steel tubes and pipes for nuclear power plant.Part 1. Carbon steel seamless tubes and pipes
ICS 77.140.75
H48
National Standards of People's Republic of China
Nuclear power plants with seamless steel pipe
Part 1. Carbon steel seamless pipe
Posted 2009-10-30
2010-06-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
5.1.2,5.2.2,5.3.1.2,5.3.2.1,5.5,5.7,6.1.2,6.1.3 this section , 6.2.2.2,6.3.2,6.7,6.14.2,
9.2 are recommended, the rest are mandatory.
GB 24512 and the name of the structure is expected to "seamless steel tubes for nuclear power plants" as follows.
--- Part 1. Carbon steel seamless pipe;
--- Part 2. alloy steel seamless steel tubes;
--- Part 3. stainless steel seamless pipe.
This section GB 24512 "nuclear power plant seamless steel pipe," Part 1. This section referring to EN10216-2.2002 "for pressure purposes
Seamless steel pipe Technical delivery conditions - Part 2. Unalloyed and alloyed steel high temperature performance "and" ASME Boiler and Pressure
Vessel Code, Vol. Ⅱ A piece of iron-based materials, "the 2007 edition of the SA-106" high temperature carbon steel seamless pipe specification ", SA-210M
"Boiler and Superheater carbon steel seamless steel pipe specifications" to develop.
This section Appendix B, Appendix C are normative appendices, Appendix A is an information appendix.
This part is proposed by the China Iron and Steel Association.
This part of the National Steel Standardization Technical Committee (SAC/TC183) centralized.
This section is drafted. Pangang Group Chengdu Iron & Steel Co., Ltd., Metallurgical Industry Information Standards Institute, Suzhou Institute of Thermal Engineering have
Ltd., Shenyang East Tube Power Technology Group Limited.
The main drafters of this section. Li Qi, Cheng Haitao, such as Yan Dong Li, Zhao Yanfen, Guoyuan Rong, Huang Ying, Xue Fei, Wu Hong, Liu Gang, Yu Yang.
Nuclear power plants with seamless steel pipe
Part 1. Carbon steel seamless pipe
1 Scope
GB 24512 of the provisions of this part of the nuclear power plant with carbon steel seamless pipe classification, code, size, shape, weight and tolerances, technical
Operation requirements, test methods, inspection rules, packaging, labeling and quality report.
This section applies to the manufacture of nuclear power plants 1,2,3 and non-nuclear pressure equipment parts Seamless carbon steel (including carbon manganese steel).
2 Normative references
The following documents contain provisions which, through reference in this Part of GB 24512, constitute provisions of this part. For dated reference documents
Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section
Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this
section.
GB/T 222 chemical composition of finished steel tolerance
GB/T 223.5 steel Determination of total soluble silicon and silicon content reduced silicon molybdate salt spectrophotometric method (GB/T 223.5-
2008, ISO 4829-1. 1986, ISO 4829-2. 1988, MOD)
GB/T 223.9 steel and aluminum alloys - Determination of chromium content Azure S Spectrophotometry
Determination of GB/T 223.11 steel and alloy chromium content of visual titration or potentiometric titration (GB/T 223.11-2008,
ISO 4937. 1986, MOD)
GB/T 223.12 Methods for chemical analysis of iron, steel and alloys of sodium carbonate separation - diphenyl hydrazine spectrophotometric determination of chromium content
GB/T 223.14 Methods for chemical analysis of iron, steel and alloys, tantalum reagent extraction and spectrophotometric determination of vanadium content
Spectrophotometric determination of titanium content GB/T 223.16 Methods for chemical analysis of iron, steel and alloy The chromotropic acid
GB/T 223.18 Methods for chemical analysis of iron, steel and alloy The sodium thiosulfate separation - determination of copper content Iodometry
GB/T 223.23 steel and alloy - Determination of nickel content dimethylglyoxime spectrophotometry
GB/T 223.26 steel and alloy - Determination of molybdenum content - Thiocyanate spectrophotometric
GB/T 223.29 steel and alloys of lead content measured carrier precipitation - xylenol orange spectrophotometric method
223.31 Steel Determination GB/T and alloy distillation of arsenic content - Molybdenum blue spectrophotometric method (GB/T 223.31-2008,
ISO 17058.2004, IDT)
GB/T 223.40 Determination of steel and alloy niobium content sulphochlorophenol S spectrophotometry
GB/T 223.50 Methods for chemical analysis of iron, steel and alloy Phenylfluorone - Direct spectrophotometric determination of cetyl trimethyl ammonium bromide
Tin
GB/T 223.53 Methods for chemical analysis of iron, steel and alloys by flame atomic absorption spectrophotometric method for determination of copper content (GB/T 223.53-
1987, eqv ISO /DIS4943. 1986)
GB/T 223.54 Methods for chemical analysis of iron, steel and alloys by flame atomic absorption spectrophotometric method for determination of nickel content (GB/T 223.54-
1987, eqv ISO /DIS4940. 1986)
GB/T 223.58 Methods for chemical analysis of iron, steel and alloys of sodium arsenite - sodium nitrite determination of manganese content titration
GB/T 223.59 Steel and Alloy Determination of phosphorus content by bismuth phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate blue spectrophotometry
GB/T 223.60 Methods for chemical analysis of iron, steel and alloy perchloric acid dehydration gravimetric method for the determination of silicon content
GB/T 223.62 Methods for chemical analysis of iron, steel and alloy butyl acetate extraction spectrophotometric determination of phosphorus content
GB/T 223.63 Methods for chemical analysis of iron, steel and alloy The sodium (potassium) for Determination of amount
GB/T 223.64 steel and alloy manganese content - Flame atomic absorption spectrometric method (GB/T 223.64-2008,
ISO 10700.1994, IDT)
GB/T 223.67 steel and alloy sulfur content - Methylene blue spectrophotometric method (GB/T 223.67-2008,
ISO 10701.1994, IDT)
Determination of sulfur content of potassium iodate titration method after GB/T 223.68 Methods for chemical analysis of iron, steel and alloy tube furnace combustion
GB/T 223.69 after carbon and alloy steel - Determination of the pipe furnace combustion gas volumetric method
After the determination of carbon content - Gravimetric method GB/T 223.71 Methods for chemical analysis of iron, steel and alloy tube furnace combustion
GB/T 223.72 steel and alloy sulfur content - Gravimetric method
GB/T 223.76 Methods for chemical analysis of iron, steel and alloys by flame atomic absorption spectrometry of vanadium content
GB/T 223.78 Methods for chemical analysis of iron, steel and alloy Curcumin spectrophotometric determination of boron content directly (GB/T 223.78-2000,
idt ISO 10153.1997)
GB/T 224 Determination of depth of decarburization of steel method (GB/T 224-2008, ISO 3887.2003, MOD)
GB/T 226 steel macrostructure and defect etching test method (GB/T 226-1991, neq ISO 4969. 1980)
GB/T 228 metal materials at room temperature tensile test method (GB/T 228-2002, eqv ISO 6892.1998)
GB/T 229 metal Charpy pendulum impact test method (GB/T 229-2007, ISO 148-1.2006, MOD)
GB/T 232 metallic materials - Bend test (GB/T 232-1999, eqv ISO 7438. 1985)
GB/T 241 metal pipe Hydrostatic pressure testing
GB/T 242 Test Method metal tube expansion port (GB/T 242-2007, ISO 8493.1998, IDT)
GB/T 246 metal pipe flattening test method (GB/T 246-2007, ISO 8492.1998, IDT)
GB/T 1979 structure steel macrostructure and defect rating FIG.
GB/T 2102 Acceptance, packing, marking and quality certification
GB/T 2975 Steel and steel products for mechanical testing location and sample preparation (GB/T 2975-1998, eqv ISO 377.
1997)
GB/T 4336 carbon steel and low alloy steel spark source atomic emission spectrometry method (conventional method)
GB/T 4338 high-temperature metallic materials - Tensile testing (GB/T 4338-2006, ISO 783.1999, MOD)
GB/T 5777-2008 Seamless Steel ultrasonic testing method (ISO 9303. 1989, Seamlessandwelded (except
submergedarc-welded) steeltubesforpressurepurposes-fulperipheralultrasonictestingforthede-
tectionoflongitudinalimperfections, MOD)
GB/T 6394 Determination of average grain size of metal (GB/T 6394-2002, ASTME112.1996, MOD)
GB/T 7735 steel pipe eddy current testing method (GB/T 7735-2004, ISO 9304. 1989, MOD)
GB/T 10561 Steel - Determination of content of nonmetallic inclusions standards diagrams microscopic examination method (GB/T 10561-2005,
ISO 4967.1998, IDT)
GB/T 12606 pipe magnetic flux leakage inspection method (GB/T 12606-1999, eqv ISO 9402. 1989; ISO 9598. 1989)
GB/T 13298 metal microstructure inspection method
GB/T 15822 (all parts), non-destructive testing magnetic particle testing
GB/T 17395 seamless steel pipe size, shape, weight and tolerances (GB/T 17395-2008, ISO 4200.1991,
ISO 5252.1991, ISO 1127.1992, NEQ)
GB/T 17505 Steel and steel products General technical delivery requirements (GB/T 17505-1998, eqv ISO 404.1992)
GB/T 20066 Steel and iron - Sampling and determination of the chemical composition of the sample with a sample preparation method (GB/T 20066-2006, ISO 14284.
1996, IDT)
GB/T 20123 Steel - Determination of total carbon and sulfur content of the high-frequency induction furnace combustion infrared absorption method (conventional method)
(GB/T 20123-2006, ISO 15350.2000, IDT)
Inductively coupled plasma atomic GB/T 20125 low-alloy steel multielement emission spectrometry
GB/T 20490 Seamless and welded (except submerged arc welded) steel tubes layered ultrasonic testing (GB/T 20490-2006,
ISO 10124.1994, MOD)
JB/T 4730.5 Non-destructive testing of pressure equipments - Part 5. penetrant testing
YB/T 4149 casting tube round
YB/T 5137 high-pressure hot-rolled and forged seamless steel tube round
3 Classification and designation
3.1 part by seamless steel pipe manufacturing is divided into two categories, their category and code are as follows.
a) hot-rolled (extrusion, top, forging, expansion) steel, codenamed W-H;
b) cold drawn (rolled) steel pipe, codenamed W-C.
Seamless Steel 3.2 part by dimensional accuracy divided into two categories, their category and code are as follows.
a) ordinary level precision, code-named PA;
b) High precision, code-named PC.
3.3 The following codes apply to this part.
D outer diameter (nominal diameter, unless otherwise specified or the calculated diameter, is calculated nominal diameter or outside diameter)
S wall thickness (unless otherwise specified nominal wall thickness or minimum thickness, is the nominal wall thickness or minimum thickness)
Smin minimum wall thickness
3.4 steel grades representative of nuclear power by the use of Chinese pinyin first in capital letters (HD) and room temperature, under specified minimum yield strength or
Proof strength values of steel composition, control the Cr content should be followed by the chemical symbol Cr.
For example. HD245, HD245Cr
among them.
HD --- "nuclear power" Pinyin first in capital letters;
Provisions 245 --- room temperature under minimum yield strength or proof strength value, in megapascals (MPa);
Cr --- chemical element symbol represents the content control Cr steels (Cr content of not less than 0.15%).
4 ordering content
The pipe section ordering contract or order should include the following.
a) the standard number;
b) the product name;
c) nuclear power plants for the manufacture of steel grade, level. 1, 2, or non-nuclear;
d) steel grades;
e) the number of orders (total weight or length);
f) Dimensions;
g) special requirements.
5 size, shape, weight and tolerance
5.1 diameter and wall thickness
5.1.1 nominal diameter steel pipe according to the nominal wall thickness and delivery pipe nominal diameter and nominal wall thickness shall comply with GB/T 17395 of.
5.1.2 According to the requirements, negotiated by both sides, according to pipe nominal diameter and minimum wall thickness, nominal inner diameter and nominal wall thickness or other foot
Inch standard mode of delivery.
According to the requirements, negotiated by both sides, we can supply other than the GB/T 17395 predetermined size of the pipe.
Note. If not otherwise specified nominal wall thickness or minimum thickness, this part of the "wall thickness" is the nominal wall thickness or the minimum wall thickness; unless otherwise specified nominal diameter or count
Operators diameter, this part of the "OD" is the nominal diameter or outside diameter calculated.
5.2 diameter and wall thickness of tolerance
5.2.1 nominal diameter steel pipe according to the nominal wall thickness and delivery, the nominal diameter and nominal wall thickness tolerances shall comply with the provisions in Table 1.
Pipe according to the nominal outside diameter and minimum wall thickness of the delivery, the nominal diameter tolerances shall comply with the requirements of Table 1, the wall thickness deviation should be allowed
In accordance with Table 2.
Specified in Table 1 together.
5.2.2 When the demand side is not specified in the contract pipe size tolerance level, pipe diameter and wall thickness tolerances shall comply with the general level of
Provisions.
According to the requirements, negotiated by both sides, and in the contract, the supply table outside dimensions and tolerances specified in Table 2 1 steel
Tube or other steel pipe inner diameter tolerances.
Table 1 pipe nominal diameter and nominal wall thickness tolerances in millimeters
Manufacturing methods pipe size classification code
Tolerance
Ordinary Level (PA) Advanced (PC)
W-H
Hot-rolled (extrusion, top, forging)
Steel Pipe
Nominal diameter
(D)
Nominal wall thickness
(S)
≤54 ± 0.40 ± 0.30
> 54 ± 1% D ± 0.75% D
≤4.0 ± 0.45 ± 0.35
> 4.0 to 20
+ 12.5% S
-10% S
± 10% S
> 20
D < 219 ± 10% S ± 7.5% S
D≥219
+ 12.5% S
-10% S
± 10% S
W-H thermal expansion pipe
Nominal diameter
(D)
All ± 1% D ± 0.75% D
Nominal wall thickness
(S)
Complete
+ 18% S
-10% S
+ 12.5% S
-10% S
Table 1 (continued) millimeters
Manufacturing methods pipe size classification code
Tolerance
Ordinary Level (PA) Advanced (PC)
W-C
Cold drawn (rolled)
Steel Pipe
Nominal diameter
(D)
Nominal wall thickness
(S)
≤25.4 ± 0.15 -
> 25.4 ~ 40 ± 0.20 -
> 40 ~ 50 ± 0.25 -
> 50 ~ 60 ± 0.30 -
> 60 ± 0.5% D -
≤3.0 ± 0.3 ± 0.2
> 3.0 ± 10% S ± 7.5% S
Table 2 pipe minimum wall thickness tolerances in millimeters
Manufacturing methods classification code thickness range
Tolerance
Ordinary level Advanced
W-H hot-rolled (extrusion, top, forging) steel
Smin≤4.0 +0.9 0
+0.7
Smin > 4.0
+ 25% Smin
+ 22% Smin
W-C cold drawn (rolled) steel pipe
Smin≤3.0 +0.6 0
+0.4
Smin > 3.0
+ 20% Smin
+ 15% Smin
5.3 length
5.3.1 usual length
5.3.1.1 pipe length is generally 4000mm ~ 12000mm.
5.3.1.2 negotiated by both sides, and specified in the contract, the delivery of a length greater than or less than 4000mm 12000mm but not less than
3000mm pipe. Shorter than 4000mm 3000mm pipe but not less than, the number should not exceed the total batch delivery pipe
5% of the amount.
5.3.2 cut length and double length
5.3.2.1 According to the requirements, negotiated by both sides, and in the contract, the length of the pipe can be cut to length or double length delivery.
5.3.2.2 Pipe press cut length delivery, the length tolerances shall comply with the following requirements.
When a) D≤406.4mm, + 15 0 mm;
b) D > when 406.4mm, + 20 0 mm.
5.3.2.3 Pipe press double length delivery, each double length the following provisions shall stay out of the incision margin.
When a) D≤159mm, cut the balance of 5mm ~ 10mm;
b) 159 < When D≤406.4mm, cut the balance of 10mm ~ 15mm;
c) D > When 406.4mm, and the balance of the cut 15mm ~ 20mm.
5.4 curvature
5.4.1 curvature per meter pipe shall be as follows.
a) S≤15mm time, not more than 1.5mm/m;
b) 15mm < when S≤30mm, not more than 2.0mm/m;
c) S > When 30mm, is not greater than 3.0mm/m.
5.4.2 D≥127mm steel pipe, the entire length of the bend should not exceed 0.10% of the total pipe length.
5.5 roundness and uneven thickness
According to the requirements, negotiated by both sides, and specified in the contract, roundness and wall thickness of the pipe shall not exceed the outer diameter, respectively, and no
80% of the wall thickness tolerance.
5.6 tip shape
Pipe ends and pipe end should be perpendicular to the axis, cut burr should be removed.
5.7 wt.
5.7.1 Delivery Weight
Pipe according to nominal diameter and nominal wall thickness or nominal inner diameter and a nominal wall thickness delivery pipe according to the actual weight of the delivery, also according to theoretical weight
delivery.
Pipe according to the nominal outside diameter and minimum wall thickness delivery pipe according to the actual weight of the delivery; supply and demand sides negotiated and specified in the contract, also steel
According to theoretical weight delivery.
5.7.2 Calculation of theoretical weight
Steel pipe theoretical weight calculated according to the provisions of GB/T 17395 (density steel press 7.85kg/dm3).
According to the nominal inner diameter and a nominal wall thickness of the delivery pipe, the outer diameter shall be calculated theoretical weight calculation, the calculation is based on the nominal inside diameter of the outer diameter and nominal
The outer diameter of the wall thickness calculated value; press delivery pipe minimum wall thickness should be used to calculate the average thickness of the theoretical weight, which is based on the thickness and the average thickness
Which allows the wall thickness deviation calculated from the average of the maximum and minimum values.
5.7.3 Weight Tolerance
According to the requirements, negotiated by both sides, and in the contract, the delivery pipe theoretical weight of the actual weight and deviation should be consistent as
Under the provisions of.
a) a single pipe. ± 10%;
b) a minimum of 10t each batch of steel pipe. ± 7.5%.
6 Technical Requirements
Grades and chemical composition of the steel 6.1
6.1.1 steel grades and chemical composition (melting component and finished components) shall comply with the requirements of Table 3.
Terminology finished chemical composition, and method of determining the definition should be consistent with the provisions of GB/T 222's.
Unless smelting needs, without the need to agree, it allows you to add elements not mentioned in Table 3 in the steel. The manufacturer shall take all appropriate
Measures to prevent other scrap materials and production processes used in the mechanical properties of steel to weaken and fitness elements into steel.
6.1.2 According to the requirements, negotiated by both sides, and in the contract, in addition to the elements specified in Table 3, further analysis of the chemical composition of the finished product
Boron, lead, arsenic and mercury, and to provide results of its analysis to the demand side.
6.1.3 This section of steel grades and other similar standard grades of steel control See Appendix A.
Book Book Book
(quality
) /
Si
Cr
Ni
Al
to
Cu
Sn
Ce
qb
D2
. 2
. 1
. 3
. 0
. 2
. 1
. 2
. 2
. 0
. 0
. 0
. 0
. 2
. 1
. 3
. 0
. 2
. 1
. 2
. 2
. 0
. 0
. 0
. 0
D2
Cr
. 2
. 1
. 3
. 0
. 2
. 3
. 1
. 2
. 2
. 0
. 0
. 0
. 0
. 2
. 1
. 3
. 0
. 1
. 3
. 1
. 2
. 2
. 0
. 0
. 0
. 0
D2
. 2
. 4
. 4
. 3
. 0
. 3
. 0
. 0
. 2
. 0
. 0
Ti
. 0
. 0
. 0
. 0
. 2
. 4
. 4
. 3
. 0
. 3
. 0
. 0
. 2
. 0
. 0
Ti
. 0
. 0
. 0
. 0
D2
Cr
. 2
. 4
. 4
. 1
. 3
. 0
. 3
. 0
. 0
. 2
. 0
. 0
Ti
. 0
. 0
. 0
. 0
. 2
. 4
. 4
. 1
. 3
. 0
. 3
. 0
. 0
. 2
. 0
. 0
Ti
. 0
. 0
. 0
. 0
Book Book Book
(Cont.
(quality
) /
Si
Cr
Ni
Al
to
Cu
Sn
Ce
qb
D2
. 2
. 1
. 3
. 8
. 6
. 2
. 1
. 5
. 0
. 0
. 2
. 0
. 4
. 0
. 0
. 2
. 1
. 4
. 8
. 6
. 2
. 1
. 5
. 0
. 0
. 2
. 0
. 4
. 0
. 0
D2
Cr
. 2
. 1
. 3
. 0
. 6
. 1
. 3
. 1
. 5
. 0
. 0
. 2
. 0
. 4
. 0
. 0
. 2
. 1
. 4
. 0
. 6
. 1
. 3
. 1
. 5
. 0
. 0
. 2
. 0
. 4
. 0
. 0
Al
to
Cu
Sn
. 5
,allow
Sn
. 0
, but
. 0
,copper
. C
. 1
, C
6S
. 3
. C
e q
n /
(C
) /
(N
i +
Cu
) /
D2
D2
Cr
Al
to
. 0
,Do not
, but
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. C
Ni
Cu
. 7
, but
;when
Ti
The
Al
Ti
. 0
6.2 Manufacturing Methods
6.2.1 Manufacturing Outline
Former steel manufacturing, the manufacturer shall establish manufacturing outline, which shall include the manufacturing process of various manufacturing and inspection processes.
6.2.2 steel smelting method
6.2.2.1 outer arc furnace steel should be used by the Canadian refining and outer vacuum refining process, or oxygen converter plus refining and vacuum refining process,
Or ESR smelting. When the demand side to specify a particular method of smelting, should be specified in the contract.
6.2.2.2 negotiated by both sides, and specified in the contract, may be more demanding other smelting methods.
6.2.3 tube manufacturing methods and requirements of
6.2.3.1 tube should be casting, molding or hot-rolled (forged) methods.
6.2.3.2 Casting tube shall comply with YB/T 4149, wherein the low magnification defect centers crack, crack in the middle, the skin cracks and skin
Level with bubble level should be less than 1, respectively.
Hot rolling (forging) tube should be consistent with the provisions of YB/T 5137's.
Molded tube (ingot) head and tail cut the amount should be sufficient to ensure the quality of steel pipe.
6.2.4 The method of manufacturing a steel pipe
Hot-rolled steel should be used (extrusion, top, forging, expansion) or cold drawn (rolled) seamless method of manufacture. Thermal expansion pipe should refer to the blank pipe by heating the whole
Enlarging the system deformed steel tubes made of higher caliber.
Pipe machining distortion of the total elongation factor (forging ratio) of not less than 3. The manufacturer shall take appropriate manufacturing process to ensure that the pipe
Different parts of the deformation process uniformity.
6.3 Delivery Status
6.3.1 pipe should be normalizing heat treatment delivery. Normalizing heat treatment temperature should be 890 ℃ ~ 940 ℃; holding time shall comply with. press
1mm wall thickness of not less than 1min each calculation, at least 30min. After normalizing steel, it should be cooled in still air.
6.3.2 by the need to agree, and specified in the contract, the pipe can be normalized heat treatment delivery. Positive temperature heat treatment should be
890 ℃ ~ 940 ℃; holding time shall comply with. less than 1min calculated for each 1mm wall thickness by at least 30min. Temperature heat treatment of
It should not be less than 620 ℃.
6.3.3 For an outer diameter of not less than 457mm of thermal expansion of steel pipe, steel pipe end when the expansion temperature at 810 ℃ ~ 940 ℃, and the lowest temperature is not the final expansion
Lower than the phase transition critical temperature Ar3, is the result of air-cooled pipe, steel pipe should be considered is the result of normalizing.
6.4 Mechanical Properties
6.4.1 Tensile Properties
6.4.1.1 Tensile properties at room temperature
Room temperature tensile properties of the delivery status of the tubes shall conform to Table 4.
Table 4 at room temperature tensile properties of steel
No. Grade
tensile strength
Rma /
MPa
Lower yield strength or proof strength
ReL or RP0.2 /
MPa
Elongation ratio Aa /
Portrait Landscape
1 HD245 410 ~ 550 ≥245 ≥24 ≥22
2 HD245Cr 410 ~ 550 ≥245 ≥24 ≥22
3 HD265 410 ~ 570 ≥265 ≥23 ≥21
4 HD265Cr 410 ~ 570 ≥265 ≥23 ≥21
5 HD280 470 ~ 590 ≥275 ≥21 ≥21
6 HD280Cr 470 ~ 590 ≥275 ≥21 ≥21
a measured tensile strength and elongation after fracture shall comply with. Rm (A-2) > 10500.
6.4.1.2 High Temperature Tensile Properties
Delivery Status steel high-temperature tensile properties shall conform to Table 5.
Table 5 high-temperature tensile properties of steel
No. Grade
Test temperature /
tensile strength
Rm /
MPa
Proof strength
RP0.2 /
MPa
1 HD245
250 - ≥170
300 - ≥149
2 HD245Cr
250 - ≥170
300 - ≥149
3 HD265 300 ≥369 ≥154
4 HD265Cr 300 ≥369 ≥154
5 HD280 300 ≥423 ≥186
6 HD280Cr 300 ≥423 ≥186
6.4.1.3 tensile test specimens
An outer diameter less than 219mm of steel pipe, longitudinal tensile test shall be sampled along the pipe.
An outer diameter of not less than 219mm of steel pipe when pipe size permits, tr...
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