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GB 24512.2-2009: [GB/T 24512.2-2009] Seamless steel tubes and pipes for nuclear power plant -- Part 2: Alloy steel seamless tubes and pipes
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[GB/T 24512.2-2009] Seamless steel tubes and pipes for nuclear power plant -- Part 2: Alloy steel seamless tubes and pipes
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Basic data | Standard ID | GB 24512.2-2009 (GB24512.2-2009) | | Description (Translated English) | [GB/T 24512.2-2009] Seamless steel tubes and pipes for nuclear power plant -- Part 2: Alloy steel seamless tubes and pipes | | Sector / Industry | National Standard | | Classification of Chinese Standard | H48 | | Classification of International Standard | 77.140.75 | | Word Count Estimation | 16,193 | | 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 223.14; GB/T 223.18; GB/T 223.23; GB/T 223.26; GB/T 223.29; GB/T 223.31; GB/T 223.37; GB/T 223.40; 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 223.67; 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 231.1; 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 17395; GB/T 17505; GB/T 20066; GB/T 20123; GB/T 20124; 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 a 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 manufacturing nuclear non -class equipment pressure parts with a steel pipe joints. | GB 24512.2-2009: [GB/T 24512.2-2009] Seamless steel tubes and pipes for nuclear power plant -- Part 2: Alloy steel seamless tubes and pipes
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Seamless steel tubes and pipes for nuclear power plant.Part 2. Alloy steel seamless tubes and pipes
ICS 77.140.75
H48
National Standards of People's Republic of China
Nuclear power plant seamless steel pipe
Part 2. alloy steel seamless
Published 2009-10-30
2010-06-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China issued
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 , 6.2.2.2,9.2 are recommended, the rest
Mandatory.
GB 24512 "nuclear power plant seamless steel pipe," the expected structure and names are as follows.
--- Part 1. Carbon steel seamless pipe;
--- Part 2. alloy steel seamless pipe;
--- part 3. stainless steel seamless pipe.
This section GB 24512 Part 2 "seamless steel tube for nuclear power plant," the. Referring to this Part EN10216-2.2002 "The use of pressure
Technical delivery conditions of seamless steel tubes - Part 2. Non-alloy and alloy steel predetermined elevated temperature properties "and" the ASME Boiler and Pressure
Vessel Code, Part A, Vol. Ⅱ iron-based material "SA-213M 2007 Edition" boiler, superheater, and the heat exchanger ferrite and austenite
Alloy steel seamless body Specification "and SA-335M" high temperature alloy steel seamless ferritic Specification "developed.
Appendix A of this section is an informative annex.
This section was proposed by China Iron and Steel Association.
This section is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).
This section was drafted. Pangang Group Chengdu Iron & Steel Co., Ltd., Metallurgical Industry Information Standards Institute, Suzhou Thermal Power Research Institute have
Limited, Shenyang East Tube Power Technology Holdings Limited.
This part drafter. Guo Yuanrong, into Long Beach, Yan e.g., Huang Ying, Zhao Yanfen, Li Qi, Dong Li, Xue Fei, Wu Hong, Liu Gang, in the ocean.
Nuclear power plant seamless steel pipe
Part 2. alloy steel seamless
Range 1
This section specifies the GB 24512 alloy steel seamless nuclear power plant classification code, size, shape, weight and tolerance, TECHNOLOGY
Surgery requirements, test methods, inspection rules, packaging, marking and reporting.
This part of nuclear power plants for the manufacture of non-nuclear devices used alloy steel seamless pressure member.
2 Normative references
Terms of the following documents constitute provisions of this section by reference in this part of GB 24512. For dated reference documents
Pieces, all subsequent amendments (excluding corrections) or revisions do not apply to this section, however, encouraged to reach under this section
Whether the parties to the agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this
section.
Chemical composition of the finished GB/T 222 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 chromium alloy steel and the aluminum content was measured Azure S Spectrophotometry
Determination of steel and alloy chromium content GB/T 223.11 visual titration or potentiometric titration (GB/T 223.11-2008,
ISO 4937. 1986, MOD)
GB/T 223.14 steel and tantalum alloys - reagent extraction and spectrophotometric determination of vanadium content
GB/T 223.18 steel and alloys - sodium thiosulfate Separation - Determination of copper content Iodimetry
GB/T 223.23 alloy steel and nickel content measured spectrophotometrically dimethylglyoxime
GB/T 223.26 thiocyanate salt spectrophotometric determination of molybdenum content alloy steel and
GB/T 223.29 alloy steel and the measurement vector precipitated lead content - Spectrophotometric xylenol orange
Determination GB/T 223.31 and arsenic content of the alloy steel distillation - molybdenum blue spectrophotometric method (GB/T 223.31-2008,
ISO 17058.2004, IDT)
GB/T 223.37 steel and alloy analysis distillation - indophenol blue spectrophotometric determination of nitrogen
GB/T 223.40 Determination of the contents of alloy steel and niobium sulphochlorophenol S Spectrophotometry
GB/T 223.53 steel and alloy flame atomic absorption spectrometry copper content (GB/T 223.53-
1987, eqv ISO /DIS4943. 1986)
GB/T 223.54 steel and alloy flame atomic absorption spectrophotometry nickel content (GB/T 223.54-
1987, eqv ISO /DIS4940. 1986)
GB/T 223.58 steel and alloys - sodium arsenite - Determination of the amount of sodium nitrite titration manganese
GB/T 223.59 phosphorus content of steel and alloy measured by bismuth phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate blue spectrophotometric method
GB/T 223.60 steel and alloy perchloric acid dehydration gravimetric method for the determination of silicon content
GB/T 223.62 Spectrophotometric determination of phosphorus and iron alloys - butyl acetate extraction
GB/T 223.63 steel and alloys - sodium periodate (K) for Determination of the amount of
GB/T 223.67 steel and alloy Determination of sulfur content methylene blue spectrophotometric method (GB/T 223.67-2008,
ISO 10701.1994, IDT)
Determination of sulfur content potassium iodate titration method after GB/T 223.68 and alloy steel pipe furnace combustion
GB/T 223.69 after the carbon content and alloy steel measuring tube furnace combustion gas volumetric method
Gravimetric method after the determination of carbon content GB/T 223.71 and alloy steel pipe furnace combustion
GB/T 223.72 steel and alloy sulfur content Gravimetric method
Determination of the amount of vanadium spectrometry GB/T 223.76 steel and alloy flame atomic absorption analysis of
GB/T 223.78 steel and alloy curcumin spectrophotometric analysis of the boron content directly measured (GB/T 223.78-2000,
idt ISO 10153.1997)
GB /decarburized layer depth measurement method T 224 steel (GB/T 224-2008, ISO 3887.2003, MOD)
GB/T 226 steel macrostructure defects and etching test method (GB/T 226-1991, neq ISO 4969. 1980)
GB/T 228 materials at ambient temperature tensile test method (GB/T 228-2002, eqv ISO 6892.1998)
GB/T 229 metal material Charpy pendulum impact test method (GB/T 229-2007, ISO 148-1.2006, MOD)
GB/T 231.1 Brinell hardness test Part 1. Test method (GB/T 231.1-2002, eqv ISO 6506-1.
1999)
GB/T 232 of a metal material bending test method (GB/T 232-1999, eqv ISO 7438. 1985)
GB/T 241 Test Method metal hydraulic tube
GB/T 242 Test Method for expanding the metal pipe port (GB/T 242-2007, ISO 8493.1998, IDT)
GB/T 246 Test Method flattening the metal tube (GB/T 246-2007, ISO 8492.1998, IDT)
GB/T 1979-fold structural steels and defect FIG.
Acceptance of GB/T 2102 steel, packaging, marking and certification
GB/T 2975 steel test sample position and the preparation and mechanical properties of samples of steel products (GB/T 2975-1998, eqv ISO 377.
1997)
GB/T 4336 carbon steel and low alloy steel for spark discharge atomic emission spectrometric method (conventional method)
GB/T 4338 high temperature tensile test method for metallic materials (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 the metal (GB/T 6394-2002, ASTME112.1996, MOD)
GB/T 7735 steel eddy current testing method (GB/T 7735-2004, ISO 9304. 1989, MOD)
GB/T 10561 content of nonmetallic inclusions in steel was measured standards diagrams microscopic test method (GB/T 10561-2005,
ISO 4967.1998, IDT)
GB/T 12606 Steel magnetic flux leakage inspection method (GB/T 12606-1999, eqv ISO 9402. 1989; ISO 9598. 1989)
GB/T 13298 test method for a metal microstructure
GB/T 17395 seamless steel pipe size, shape, weight and tolerance (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 chemical composition of the sample and the measurement sample preparation methods (GB/T 20066-2006, ISO 14284.
1996, IDT)
GB/T 20123 total carbon and sulfur content of steel an induction furnace combustion infrared absorption method (conventional method)
(GB/T 20123-2006, ISO 15350.2000, IDT)
GB/T 20124 Determination of the nitrogen content in the steel the inert gas fusion thermal conductivity method (conventional method) (GB/T 20124-2006,
ISO 15351.1999, IDT)
YB/T 4149 casting tube round
YB/T 5137 and a high-pressure hot-rolled seamless steel tube round forged
3 Classification and designation
3.1 part by manufacturing seamless steel tube is divided into two, and its category code as follows.
a) hot rolling (extrusion, top, forging, expanded) steel, code-named W-H;
b) cold drawn (rolled) steel, code is W-C.
3.2 seamless steel pipe section into two categories according to size accuracy, and its category code as follows.
a) General level precision, code-named PA;
b) High precision, code-named PC.
3.3 The following codes apply to this section.
The outer diameter D (unless otherwise specified nominal outer diameter or the outer diameter is calculated, that is calculated nominal diameter or outer diameter)
The wall thickness S (unless otherwise specified nominal wall thickness or the minimum wall thickness, that is, the nominal wall thickness or the minimum wall thickness)
Smin minimum wall thickness
3.4 Steel grades representative of nuclear power use by the first Pinyin capital letters (HD) and chemical composition.
For example. HD15Ni1MnMoNbCu
among them.
HD --- "nuclear power" Pinyin first in capital letters;
15Ni1MnMoNbCu --- "15" represents the average carbon content (in very few dollars), followed by the alloying elements and representative of a predetermined symbol
Arabic numerals average content of alloying elements.
4 ordering content
Pipe ordered under this part of the contract or order should include the following.
a) standard number;
b) the product name;
c) steel grades;
d) Order number (or the total weight of the total length);
e) Dimensions;
f) Special requirements.
5 size, shape, weight and tolerance
5.1 diameter and wall thickness
5.1.1 steel pipe according to nominal diameter and nominal wall thickness of the delivery of steel pipe nominal outside diameter and nominal wall thickness should be consistent with GB/T 17395 of.
5.1.2 According to the demand side, the supply and demand sides negotiated, according to nominal diameter steel pipe wall thickness and minimum nominal inside diameter and nominal wall thickness or other foot
Delivery inch standard way.
According to the demand side, the supply and demand sides negotiated, can supply steel pipe size to the provisions of GB/T 17395.
NOTE. unless otherwise specified nominal wall thickness or the minimum wall thickness, this portion of the "thickness" is the nominal wall thickness or the minimum wall thickness; unless otherwise specified or nominal outside diameter meter
Operators diameter, this portion of the "OD" is the nominal outer diameter or the outer diameter is calculated.
5.2 the diameter and wall thickness tolerance
5.2.1 steel pipe according to nominal diameter and nominal wall thickness delivery, the nominal outside diameter and nominal wall thickness tolerances shall comply with the requirements in Table 1.
Outer diameter steel pipe according to the nominal wall thickness and minimum delivery, the nominal outer diameter tolerance shall be as specified in Table 1, the wall thickness deviation should be allowed
In accordance with Table 2.
Co specified in Table 1.
5.2.2 if the buyer does not indicate the size of the steel pipe in the contract tolerance level, pipe diameter and wall thickness tolerance should be consistent normal grade
Provisions.
According to the buyer requirements, the agreement between manufacturer, and in the contract, other than a predetermined size may be supplied in Table 1 and Table 2 Steel tolerance
Pipe or other pipe internal diameter tolerances.
Table 1 nominal diameter steel pipe wall thickness and the nominal allowable deviation in mm
Classification code size steel pipe manufacturing methods
Tolerance
Ordinary Level (PA) Advanced (PC)
W-H
Hot-rolled (extrusion, top,
Forging) steel pipe
Nominal diameter
(D)
Nominal wall thickness
(S)
≤54
> 54
≤4.0
> 4.0 to 20
> 20
D < 219
D≥219
± 0.40 ± 0.30
± 1% D ± 0.75% D
± 0.45 ± 0.35
+ 12.5% S
-10% S ± 10% S
± 10% S ± 7.5% S
+ 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)
All + 18% S-10% S
+ 12.5% S
-10% S
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 Steel minimum wall thickness tolerance in mm
Wall thickness range of manufacturing methods classification code
Tolerance
Ordinary level Advanced
W-H hot rolling (extrusion, top, forging) steel
Smin≤4.0 +0.9 0
+0.7
Smin > 4.0 + 25% Smin 0
+ 22% Smin
W-C cold drawn (rolled) steel
Smin≤3.0 +0.6 0
+0.4
Smin > 3.0 + 20% Smin 0
+ 15% Smin
5.3 length
5.3.1 usual length
5.3.1.1 length of the steel pipe is generally 4000mm ~ 12000mm.
5.3.1.2 negotiated by supply and demand, and in the contract, the delivery can be greater than the length or shorter than 4000mm 12000mm but not less than
3000mm pipe. But shorter in length than 4000mm 3000mm shorter than the steel pipe, which should not exceed the number of total batch delivery Steel
5% of the amount.
5.3.2 Length length and double length
5.3.2.1 According to the demand side, the supply and demand sides negotiated, and in the contract, the pipe length can be cut to length or double length delivery.
5.3.2.2 steel press cut lengths delivery, the length tolerance should meet the following requirements.
When a) D≤406.4mm, + 15 0 mm;
b) D > When 406.4mm, + 20 0 mm.
5.3.2.3 steel press delivery double length, each double length should leave a notch below a predetermined margin.
When a) D≤159mm, cutout balance 5mm ~ 10mm;
b) 159 < When D≤406.4mm, the balance of the cutout 10mm ~ 15mm;
c) D > When 406.4mm, the balance of the cutout 15mm ~ 20mm.
5.4 curvature
5.4.1 curvature per meter pipe shall be as follows.
a) S≤15mm time, no greater than 1.5mm/m;
b) 15mm < When S≤30mm, no greater 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 be more than 0.10% of the total length of the pipe.
5.5 roundness and uneven thickness
According to the demand side, the supply and demand sides negotiated and specified in the contract, roundness and wall thickness of the pipe shall not exceed the outside diameter and are not
80% of the wall thickness tolerances.
5.6 tip shape
Pipe and pipe end faces at both ends should be perpendicular to the axis, the cutout burrs should be removed.
5.7 Weight
5.7.1 Delivery Weight
Pipe according to nominal diameter and a nominal wall thickness and a nominal inside diameter or the nominal wall thickness of delivery, delivery by actual weight of steel, also according to theoretical weight
delivery.
Pipe according to the nominal outside diameter and minimum wall thickness delivery, delivery according to the actual weight of the steel pipe; supply and demand sides negotiated and specified in the contract, also steel
Theoretical weight may be delivered.
5.7.2 Calculation of the theoretical weight
Theoretical calculation of the weight of steel required to GB/T 17395 (density of steel according to 7.85kg/dm3).
Press nominal inside diameter and nominal wall thickness of the delivery pipe, the outer diameter should be calculated using theoretical weight calculation, which is calculated according to the nominal outside diameter and a nominal inside diameter
Calculated thickness value outside diameter; wall thickness by the minimum delivery pipe, should be calculated theoretical weight average wall thickness, which is based on the wall thickness and the average thickness
The maximum allowed deviation of the calculated average value and the minimum value of the wall thickness.
5.7.3 Weight Tolerance
According to the demand side, the supply and demand sides negotiated, and in the contract, the deviation of the actual weight with the theoretical weight of the delivery pipe shall comply with such
Under the provisions.
a) a single steel tube. ± 10%;
b) minimum batch of steel 10t. ± 7.5%.
6 Technical Requirements
Grades and chemical composition of the steel 6.1
6.1.1 Steel grade and chemical composition (melting component and the finished component) shall be as specified in Table 3.
Related terms of chemical composition of the finished product, the definition and determination method shall conform to GB/T 222 a.
Unless smelting needs, without the need to agree, not allowed 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 to weaken the mechanical properties of steel and fitness elements into steel.
6.1.2 According to the demand side, the supply and demand sides negotiated, and in the contract, in addition to the elements specified in Table 3, also finished chemical analysis
It includes boron, lead, arsenic and mercury, and provides the analysis result to the demand side.
6.1.3 grade steel part with other standard steel grades similar to the control in Appendix A.
Table 3 Steel grade and chemical composition of the
No. Grade sampling
Chemical composition (mass fraction) /%
C Si Mn Cr Mo V Ni Altot Cu Nb N
P S
no greater than
HD12Cr2Mo
Melting
ingredient
0.08
0.15
0.50
0.40
0.70
2.00
2.50
0.90
1.20
0.08
0.30
- ≤
0.20
- - 0.0250.015
End product
ingredient
0.07
0.16
0.54
0.37
0.73
1.90
2.60
0.86
1.24
0.08
0.30
- ≤
0.20
- - 0.0300.020
HD15Ni1Mn-
MoNbCu
Melting
ingredient
0.10
0.17
0.25
0.50
0.80
1.20
0.15
0.30
0.25
0.40
0.02
1.00
1.30
0.050
0.50
0.80
0.015
0.025
0.020
0.0250.015
End product
ingredient
0.09
0.18
0.21
0.54
0.76
1.24
0.14
0.35
0.21
0.44
0.02
0.95
1.35
0.055
0.45
0.85
0.010
0.030
0.020
0.0300.020
Note. Altot refers to the aluminum content.
6.2 Manufacturing Methods
6.2.1 Manufacturing Outline
Former steel pipe manufacturing, the manufacturer shall establish manufacturing outline, which should include various manufacturing and inspection process in the manufacturing process.
6.2.2 steel smelting method
6.2.2.1 outer arc furnace steel should be applied and refined by the refining outside the vacuum refining process, or added oxygen converter and vacuum refining furnace,
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 supply and demand, and specified in the contract, other smelting methods can be more demanding.
6.2.3 and tube manufacturing method of claim
6.2.3.1 tube should continuous casting, molding or hot-rolled (wrought) manufacturing method.
6.2.3.2 casting tube shall comply YB/T 4149, wherein the macrostructure crack defect centers, intermediate cracks, cracks and subcutaneous skin
Under each level of bubbles should be not more than one stage.
Hot-rolled (forged) tube should be consistent with the provisions of YB/T 5137's.
Molded shell (ingot) of the head and tail cut should be of sufficient quantity to ensure the quality of steel.
A method for producing a steel pipe 6.2.4
Hot-rolled steel should be used (extrusion, top, forging, expanded), or a method for producing seamless cold drawn (rolled). Thermal expansion pipe shall mean the overall heating the steel billet
Enlarging larger diameter steel pipe made from a deformable.
Total extension coefficient (forging ratio) steel processing deformation is not less than 3. The manufacturer shall take appropriate manufacturing process to ensure that the pipe
Machining different parts of the uniform deformation.
6.3 Delivery status
Steel should be delivered to heat treatment. Heat treatment of steel shall conform to Table 4.
Table 4 heat treatment of steel
Reference grade heat treatment
Austenitizing and tempering
The heating temperature /
Cooling medium
The heating temperature /
Cooling medium
Holding time
1 HD12Cr2Mo
Normalized and tempered or
Quenched and tempered
Normalizing. 900 to 960
Quenching. ≥900
Air or
Rapid cooling
700-750 Air
HD15Ni1Mn-
MoNbCu
Normalized and tempered or
Quenched and tempered
Normalizing. 900 to 980
Quenching. 880 to 930
Air or
Rapid cooling
630 ~ 680 Air
Normalizing by holding time per thickness
1mm less than 1.5min computing,
But not less than 20min.
Tempering time is not less than 1h
6.4 Mechanical Properties
6.4.1 Tensile properties
Tensile properties at room temperature 6.4.1.1
Room temperature tensile properties of the delivery status of the tubes shall be as specified in table 5.
Table 5 Tensile properties at room temperature pipe
No. Grade
Tensile properties
tensile strength
Rm /
MPa
Proof strength
RP0.2 /
MPa
Percentage elongation
A /
Portrait Landscape
1 HD12Cr2Mo 450 ~ 600 ≥280 ≥22 ≥20
2 HD15Ni1MnMoNbCu 620 ~ 780 ≥440 ≥19 ≥17
High Temperature Tensile Properties 6.4.1.2
Delivery Status steel temperature tensile properties should meet the requirements in Table 6. HD15Ni1MnMoNbCu temperature tensile test temperature
Specified in the contract according to the demand side.
Table 6 high-temperature tensile properties of steel
No. Grade
Test temperature /
tensile strength
Rm /
MPa
Proof strength
RP0.2 /
MPa
rate of reduction in area
Z/
Single average value
1 HD12Cr2Mo 350 - ≥185 - -
2 HD15Ni1MnMoNbCu
200 ≥520 ≥402 ≥35 ≥25
300 ≥520 ≥382 ≥35 ≥25
400 ≥500 ≥343 ≥35 ≥25
Tensile test specimens 6.4.1.3
Pipe diameter of less than 219mm, the longitudinal tensile test should be sampled along the pipe.
An outer diameter of 219mm steel pipe, when the pipe size allowed, transverse tensile test should be taken cylindrical test pieces along the pipe. when
When the pipe size is insufficient, taken along a transverse cylindrical test pieces, a tensile test sample shall be the longitudinal direction steel. Lateral cylindrical test should
Taken from a sample without flattening.
6.4.2 Hardness
Pipe delivery status should be done Brinell hardness test, hardness test measured values should be provided to the demand side.
6.4.3 impact absorption energy
6.4.3.1 delivery status of steel Charpy V-notch impact energy absorption K Qiao 2 shall be in accordance with Table 7.
Impact test results should be consistent with the determination GB/T 2102's.
Table 7 Qiao-notch Charpy impact absorption energy (K Qiao 2) joules
No. Grade
20 ℃ 0 ℃ -20 ℃
Longitudinal transverse longitudinal transverse longitudinal transverse
1 HD12Cr2Mo ≥45 ≥30 - - - -
2 HD15Ni1MnMoNbCu ≥95 ≥64 ≥80 ≥54 ≥60 ≥40
The impact energy absorbing Table 7 6.4.3.2 full size specimen absorbed energy summer V-notch impact value requirements. When a small size red
When the sample was hit, the minimum sample size smaller Charpy V-notch impact absorption energy requirement value should absorb impact energy full size specimens required value
Table decreasing coefficients multiplied by 8.
Table 8 small sample size diminishing impact absorption energy coefficient
Sample Size Sample Size (width × height)/(mm × mm) decreasing coefficient
Standard sample 10 × 10 1.00
Small specimens 10 × 7.5 0.75
Small specimens 10 × 5 0.50
6.4.3.3 pipe outer diameter smaller than 219mm, the impact test sample along the vertical or horizontal steel; as contract without special provisions, arbitration sample
It should be taken longitudinally along the pipe.
Pipe diameter not less than 219mm of steel in the lateral impact test should be sampled.
Notch impact test specimens shall be perpendicular to the axial axis of the steel pipe (steel pipe surface).
Whether taken longitudinally or laterally taken along steel, impact of the sample in the steel should be a standard size, width, or width 7.5mm 5mm
The sample size may be larger. When the pipe wall thickness is not greater than 6.0mm, not impact test.
6.5 Hydraulic Test
Steel hydraulic test should be carried out by the root. The hydraulic pressure test according to formula (1) is calculated, the maximum test pressure should not exceed 50MPa. In test
...
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