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GB/T 34207-2017

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GB/T 34207-2017English199 Add to Cart Days<=3 Wide and heavy plates for offshore line pipe Valid GB/T 34207-2017
GB/T 34207-2017Chinese18 Add to Cart <=1-day [PDF from Chinese Authority, or Standard Committee, or Publishing House]

   
Detail Information of GB/T 34207-2017; GB/T34207-2017
Description (Translated English): Wide and heavy plates for offshore line pipe
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H46
Word Count Estimation: 11,115
Date of Issue: 2017-09-07
Date of Implementation: 2018-06-01
Drafting Organization: Wuhan Iron and Steel Co., Ltd., Metallurgical Industry Information Standards Institute, Jiangsu Shagang Group Co., Ltd., Shougang Corporation, Anshan Iron and Steel Co., Ltd.
Administrative Organization: National Steel Standardization Technical Committee (SAC/TC 183)

GB/T 34207-2017
Wide and heavy plates for offshore line pipe
ICS 77.140.50
H46
National Standards of People's Republic of China
Wide and thick steel plate for submarine pipeline
Published on.2017-09-07
2018-06-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration issued
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Iron and Steel Association.
This standard is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).
This standard was drafted. Wuhan Iron and Steel Co., Ltd., Metallurgical Industry Information Standards Institute, Jiangsu Shagang Group Co., Ltd., Shougang
Head Office, Angang Steel Co., Ltd.
The main drafters of this standard. Xu Jinqiao, Guo Bin, Zhang Weixu, Li Xiaobo, Shen Qinyi, Ren Yi, Li Lizhen, Li Qian, Nie Wenjin, Shi Li, Xu Wei,
Zou Hang, Zhang Zhengquan.
Wide and thick steel plate for submarine pipeline
1 Scope
This standard specifies the grade indication method, order content, size, shape, weight, technical requirements, and test of hot-rolled wide and thick steel plates for submarine pipelines.
Test methods, inspection rules, packaging, signs and quality certificates.
This standard is applicable to wide and thick steel plates (hereinafter referred to as steel plates) for submarine pipelines with a thickness of 6mm~45mm.
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 edition (including all amendments) applies to this document.
GB/T 223.9 Determination of aluminium content in steels and alloys - chrome azure S spectrophotometric method
GB/T 223.11 Determination of chromium content in steels and alloys - either titration or potentiometric titration
GB/T 223.14 Methods for chemical analysis of steels and alloys - Determination of vanadium content by extraction spectrophotometric method
GB/T 223.16 Methods for chemical analysis of steels and alloys - Determination of titanium content by chromotropic acid photometric method
GB/T 223.18 Methods for chemical analysis of steels and alloys - Separation of sodium thiosulfate - Iodometric method
GB/T 223.26 Determination of molybdenum content of steels and alloys - thiocyanate spectrophotometric method
GB/T 223.37 Methods for chemical analysis of steels and alloys - Distillation separation - Determination of nitrogen content
GB/T 223.40 Determination of bismuth content of steels and alloys - s
GB/T 223.54 Determination of nickel content by flame atomic absorption spectrophotometry
GB/T 223.59 Determination of phosphorus content of steels and alloys - phosphine molybdenum blue spectrophotometric method and bismuth phosphomolybdenum blue spectrophotometric method
GB/T 223.61 Steel and alloys - Determination of silicon content
GB/T 223.63 Determination of manganese content by sodium periodate (potassium) photometric method
GB/T 223.67 Determination of sulphur content of steels and alloys
GB/T 223.69 Determination of carbon content of steel and alloys
GB/T 223.75 Determination of boron content in steel and alloys - Distillation - Curcumin photometric method
GB/T 228.1 tensile testing of metallic materials - Part 1
GB/T 229 metal material Charpy pendulum impact test method
GB/T 232 metal bending test method
General provisions for GB/T 247 steel and steel strip packaging, marking and quality certificates
GB/T 709-2006 Hot rolled steel sheet and strip size, shape, weight and tolerance
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 Determination of multi-element content of carbon steel and medium-low alloy steels by spark discharge atomic emission spectrometry (conventional method)
GB/T 4340.1 Metallic materials - Vickers hardness test - Part 1. Test method
GB/T 6394 method for determination of average grain size of metals
GB/T 8170 Numerical Rounding Rules and Representation and Determination of Limit Values
GB/T 8363 ferritic steel drop hammer tear test method
GB/T 10561-2005 Determination of non-metallic inclusions in steel - Standard s
GB/T 12778 metal Charpy impact fracture determination method
GB/T 13298 metal microstructure inspection method
Microstructure evaluation method of GB/T 13299 steel
GB/T 14977 General requirements for surface quality of hot rolled steel sheets
GB/T 20066 Sampling and sample preparation method for samples for determination of chemical composition of steel and iron
GB/T 20123 Determination of total carbon and sulfur content of steels - Infrared absorption method after high-frequency induction furnace combustion (conventional method)
GB/T 20125 Determination of multi-element content of low alloy steels by inductively coupled plasma atomic spectroscopy
GB/T 20126 Determination of low carbon content of non-alloy steels - Part 2. Infrared absorption method after combustion in induction furnaces (preheated)
GB/T 21143 Unified test method for quasi-static fracture toughness of metallic materials
3 brand representation
The steel grade is represented by the English initial letter “L” representing the pipeline “Linepipe”, the minimum extension strength of the steel pipe, and the thermomechanical rolling.
The English initials "M" of "Mechanical" and the English initial "O" representing the "Offshore" of the sea bottom are composed. At the same time
The X series grades are listed, and the double brand system is adopted. See Appendix A for the relationship between the grades.
Example. L450MO/X65MO
L---the English initials of the pipeline "Linepipe";
450---Steel pipe specifies the minimum total extension strength in MPa (MPa);
65---specify the minimum total extension strength in kpsi (6.985MPa);
M---The first letter of the mechanical mechanical rolling "Mechanical";
O---The English initials of the "Offshore" under the sea.
Note. X--- represents pipeline steel, which is derived from APISpec5L-2012 "Pipeline Steel Pipe Specification", 45th Edition.
4 Ordering content
Contracts or orders ordered in accordance with this standard shall include the following.
a) standard number;
b) product name;
c) the brand number;
d) specifications;
e) delivery status;
f) weight;
g) Other special requirements.
5 size, shape, weight
5.1 The size, shape, weight and tolerance of the steel plate shall comply with the provisions of GB/T 709-2006, and the thickness deviation shall be performed according to Class B.
5.2 After consultation between the supplier and the buyer, and indicated in the contract, steel plates of other sizes, shapes and tolerances may be supplied.
6 Technical requirements
6.1 Grades and chemical composition
6.1.1 The grade and chemical composition of the steel (melting analysis and finished product analysis) shall comply with the requirements of Table 1.
6.1.2 The supplier may only provide smelting analysis under the condition that the finished product analysis meets the requirements. If you need to provide finished product analysis, you can use another
Negotiation.
6.1.3 Other elements than those listed in Table 1 may be added after consultation between the supplier and the purchaser.
Table 1 Grades and chemical composition
Brand
Chemical composition (mass fraction) /%
no greater than
C Si Mna PSV Nb Ti Other b
L245MO/BMO 0.12 0.40 1.20 0.020 0.010 0.04 0.04 0.04 c
L290MO/X42MO 0.12 0.40 1.30 0.020 0.010 0.04 0.04 0.04 c
L320MO/X46MO 0.12 0.45 1.30 0.020 0.010 0.05 0.05 0.04 c
L360MO/X52MO 0.12 0.45 1.40 0.020 0.010 0.05 0.05 0.04 d,e
L390MO/X56MO 0.12 0.45 1.40 0.020 0.010 0.06 0.08 0.04 d,e
L415MO/X60MO 0.12 0.45 1.60 0.020 0.010 0.08 0.08 0.06 d,e
L450MO/X65MO 0.12 0.45 1.60 0.020 0.010 0.10 0.08 0.06 d,e
L485MO/X70MO 0.12 0.45 1.70 0.020 0.010 0.10 0.11 0.06 d,e
L555MO/X80MO 0.12 0.45 1.85 0.020 0.010 0.10 0.11 0.06 d,e
a The carbon content is reduced by 0.01% for each specified maximum value, and the manganese content is increased by 0.05% than the specified maximum value, but the maximum increase of manganese content should not exceed
0.20%.
b Total aluminum (Alt) content is not more than 0.060%, nitrogen (N) content is not more than 0.012%, and Al/N ≥ 2.1 (not applicable to Ti-sedated or Ti-treated steel).
c copper content is not more than 0.35%, nickel content is not more than 0.30%, chromium content is not more than 0.30%, molybdenum content is not more than 0.10%, boron content is not more than
0.0005%.
d The sum of the content of niobium, vanadium and titanium should not exceed 0.15%.
e copper content is not more than 0.50%, nickel content is not more than 0.50%, chromium content is not more than 0.50%, molybdenum content is not more than 0.50%, boron content is not more than
0.0005%.
6.2 carbon equivalent
6.2.1 Carbon equivalent (CEPcm) shall be calculated according to formula (1).
CEPcm=C
Si
Mn Cu Cr
Ni
Mo
10 5B
(1)
6.2.2 Carbon equivalents shall comply with the requirements of Table 2.
Table 2 Carbon equivalent
Brand
Carbon equivalent CEPcm/%
no greater than
L245MO/BMO 0.19
L290MO/X42MO 0.19
L320MO/X46MO 0.20
L360MO/X52MO 0.20
Table 2 (continued)
Brand
Carbon equivalent CEPcm/%
no greater than
L390MO/X56MO 0.21
L415MO/X60MO 0.21
L450MO/X65MO 0.22
L485MO/X70MO 0.22a
L555MO/X80MO 0.23a
a For steel plates with a thickness greater than 25 mm, the carbon equivalent (CEPcm) can be increased by 0.01%.
6.2.3 If the supplier has special requirements for carbon equivalent, it shall be determined by both parties.
6.3 Smelting method
Steel should be smelted in a converter or electric furnace and refined outside the furnace.
6.4 Delivery status
The steel plate shall be delivered in a thermomechanical rolling state.
6.5 Mechanical properties and process properties
6.5.1 The mechanical properties and process properties of the steel plate are to comply with the requirements of Table 3.
6.5.2 If the supply specifies a total extension strength between the two consecutive grades in Table 3, the mechanical properties and process performance are provided by
It needs to be determined by both parties.
Table 3 Mechanical properties and process properties of steel plates
Brand
Stretching test
Charpy (V-notch)
Impact test c
Drop hammer tear test
Test (DWTT)d
General extension
Stretch strength
Rt0.5a/
MPa
tensile strength
Rma/MPa
Yield ratio
Rt0.5/Rm
no greater than
After extension
Long rate
A50mm/%
not less than
Shock absorption
Energy KV2/J
Shear section
Rate FA/%
Shear area
Rate SA/%
not less than
Single-valued mean single-valued mean single-valued mean
180° bending
Test a
Vickers
hardness
HV10
no greater than
CTOD/
Mm
not less than
L245MO
/BMO
245~450 415~760 0.90
L290MO
/X42MO
290~495 415~760 0.90
L320MO
/X46MO
320~520 435~760 0.90
L360MO
/X52MO
360~525 460~760 0.90
60 80 80 90 - -
60 80 80 90 60 80
70 90 80 90 60 80
70 90 80 90 60 80
D=2a
0.15e
Table 3 (continued)
Brand
Stretching test
Charpy (V-notch)
Impact test c
Drop hammer tear test
Test (DWTT)d
General extension
Stretch strength
Rt0.5a/
MPa
tensile strength
Rma/MPa
Yield ratio
Rt0.5/Rm
no greater than
After extension
Long rate
A50mm/%
not less than
Shock absorption
Energy KV2/J
Shear section
Rate FA/%
Shear area
Rate SA/%
not less than
Single-valued mean single-valued mean single-valued mean
180° bending
Test a
Vickers
hardness
HV10
no greater than
CTOD/
Mm
not less than
L390MO
/X56MO
390~540 490~760 0.90
L415MO
/X60MO
415~565 520~760 0.90
L450MO
/X65MO
450~570 535~760 0.90
L485MO
/X70MO
485~605 570~760 0.91
L555MO
/X80MO
555~675 625~825 0.91
90 120 80 90 70 85
90 120 80 90 70 85
90 120 80 90 75 85
120 150 80 90 75 85
120 150 80 90 75 85
D=2a
0.15e
Note. a is the thickness of the sample and D is the diameter of the bend.
a After negotiation between the supplier and the buyer, the tensile performance indicators in the table can be appropriately adjusted to ensure that the horizontal and vertical strength of the finished steel pipe meet the requirements of this table.
b Tensile test specimens are plate-shaped tensile specimens with a gauge length of L0=50 mm and a width of 38 mm. For elongation requirements, see 6.5.3.
c Charpy (V-notch) impact test temperature is -20 ° C unless otherwise specified.
d Unless otherwise specified, the drop weight tear test temperature is -10 °C.
e Applicable to steel plates with a thickness of not less than 13 mm, unless otherwise specified, the CTOD test temperature is -10 °C.
6.5.3 The minimum elongation after break of the original gauge length L0=50mm A50mm shall be calculated according to formula (2).
A50mm=1940×S00.2/Rm0.9×100% (2)
In the formula.
A50mm---the minimum elongation after break at the original gauge length of 50mm;
S0 --- tensile specimen original cross-sectional area in square millimeters (mm2); for full thickness rectangular specimens, take 485mm2 and
The smaller of the sample cross-sectional area (nominal thickness × sample width), repaired to the nearest 10mm2;
Rm --- The specified minimum tensile strength in megapascals (MPa).
6.5.4 Charpy (V-notch) impact test
6.5.4.1 The required side has special requirements for the Charpy (V-notch) impact test, the test temperature, the shock absorption energy specification and the shear section rate.
It can be determined by both parties.
6.5.4.2 For Charpy (V-notch) impact test of steel plate with thickness less than 12mm, use small size sample, >8mm~<12mm
The size of the steel plate sample is 10mm × 7.5mm × 55mm, and the impact absorption energy should not be less than 75% of the value specified in Table 3; 6mm~
The size of the 8mm steel plate sample is 10mm × 5mm × 55mm, and its impact absorption energy should not be less than 50% of the value specified in Table 3, but shear
The section rate should meet the requirements of Table 3.
6.5.4.3 Perform strain aging test according to the requirements of GB/T 229. Deformed perpendicular to the rolling direction on a larger test piece,
The shape variable is the maximum deformation of the base metal in the actual pipe making process or negotiated between the supplier and the buyer, and is aged at 250 ° C for 1 h, and then on the test piece.
Take a Charpy (V-notch) impact specimen perpendicular to the rolling direction, and perform Charpy (V-notch) impact test shear section rate and absorbed energy.
Toughness-brittle transition curve test, test temperature is -60 ° C, -40 ° C, -20 ° C, -10 ° C, 0 ° C, 20 ° C, impact absorption at -20 ° C
The energy received is not less than 50% of the actual impact energy absorbed under the unaged condition, and is not less than the impact absorption energy requirement of Table 3.
6.5.5 Drop hammer tear test (DWTT)
The drop hammer tear test (DWTT) of the steel plate should in principle be a full-thickness test specimen. For example, the thickness of the steel plate is greater than 19 mm.
For the quotient, the thinning specimen can be used. The test temperature of the thinned specimen should meet the requirements of GB/T 8363. The drop hammer tear area ratio should meet the requirements of Table 3.
Provisions.
6.5.6 Vickers hardness
When the thickness of the steel plate is greater than 10mm, it shall be sampled laterally at a quarter of the width of the steel plate. After polishing, it shall be in accordance with GB/T 4340.1.
For the determination of HV10, the hardness test point shall be not less than 9 points, the quality certificate shall indicate the average value, but the single value shall not exceed the allowable conditions specified in Table 3.
value. The position is shown in Figure 1. When the thickness is not more than 10 mm, the test point may be appropriately reduced, but not less than 3 points.
Description.
t---Steel thickness.
Figure 1 Vickers hardness point location
6.6 CTOD test
If the party has special requirements for the CTOD test, the test temperature and CTOD value can be determined by negotiation between the supplier and the buyer.
6.7 grain size
The grain size of the steel plate shall comply with the requirements of Table 4.
Table 4 Grain size level
Grade grain size
L245MO/BMO~L390MO/X56MO Level 7 or finer
L415MO/X60MO~L555MO/X80MO Grade 9 or finer
6.8 Non-metallic inclusions and ribbons
6.8.1 The grades of non-metallic inclusions of Class A, B, C and D in steel plates are to comply with the requirements of Table 5. The test method is in accordance with GB/T 10561-2005
Method A.
Table 5 Non-metallic inclusion levels
ABCD
Fine system, fine system, fine system, fine system, fine system, coarse system
≤2.0 ≤2.0 ≤2.0 ≤2.0 ≤2.0 ≤2.0 ≤2.0 ≤2.0
6.8.2 The band structure of the steel plate shall not exceed 3 grades.
6.9 Surface quality
6.9.1 The supplier shall keep the surface of the steel plate clean and there shall be no grease or corrosive substances on the surface of the steel plate.
6.9.2 The surface of the steel sheet shall be free from air bubbles, crusting, cracks, folding, heavy skin, inclusions and iron oxide indentation exceeding half the thickness tolerance and
Sharp defects such as scratches.
6.9.3 The surface of the steel plate may have a thin layer of iron oxide scale, rust and inconspicuous due to the falling of the iron oxide scale.
Surface roughness, scratches, indentations and other local imperfections, but the depth should not be greater than half of the thickness tolerance, and the minimum thickness of the steel plate should be guaranteed.
6.9.4 Repair of the surface defects of the steel plate is not permitted. Allow grinding and cleaning, but the minimum thickness of the steel plate should be guaranteed, and the grinding and cleaning should be smooth and free.
edges and corners.
6.10 Ultrasonic testing
The steel plate shall be ultrasonically tested one by one according to the provisions of GB/T 2970, and the acceptance level shall be indicated in the contract. Through the supply and demand sides
Business, and noted in the contract, other ultrasonic testing standards can also be used.
6.11 Special requirements
After consultation between the supplier and the buyer, and indicating in the contract, the buyer can propose other special technical requirements (such as chemical composition, drop hammer tear) on the steel plate.
Energy, strain aging, impact energy and shear area, test temperature, anti-HIC performance requirements, etc.).
7 Test methods
7.1 The chemical composition analysis method of steel is in accordance with GB/T 223.9, GB/T 223.11, GB/T 223.14, GB/T 223.16, GB/T 223.18,
GB/T 223.26, GB/T 223.37, GB/T 223.40, GB/T 223.54, GB/T 223.59, GB/T 223.61, GB/T 223.63,
GB/T 223.67, GB/T 223.69, GB/T 223.75, GB/T 4336, GB/T 20123, GB/T 20125, GB/T 20126 or pass
The method shall be followed, but the arbitration shall be in accordance with GB/T 223.9, GB/T 223.11, GB/T 223.14, GB/T 223.16, GB/T 223.18,
GB/T 223.26, GB/T 223.37, GB/T 223.40, GB/T 223.54, GB/T 223.59, GB/T 223.61, GB/T 223.63,
GB/T 223.67, GB/T 223.69, GB/T 223.75.
7.2 The inspection items and test methods for each batch of steel plates shall comply with the requirements of Table 6.
Table 6 Inspection items, sampling quantity, sampling position and method and test method of steel plate
Serial number test item sampling quantity sampling position and method test method
1 Chemical composition group 1/furnace GB/T 20066 See 7.1
2 Tensile test 2/batch plate width 1/2, horizontal, vertical, GB/T 2975 GB/T 228.1
3 bending test 1/batch plate width 1/4, horizontal, GB/T 2975 GB/T 232
4 Impact test 1 group/batch board width 1/4, horizontal, GB/T 2975 GB/T 229, GB/T 12778
Table 6 (continued)
Serial number test item sampling quantity sampling position and method test method
5 strain aging impact 1 time plate width 1/4, horizontal, GB/T 2975 GB/T 229, GB/T 12778
6 drop hammer tear 1 group/batch plate width 1/4, horizontal, GB/T 8363 GB/T 8363
7 Vickers hardness 1/batch plate width 1/4, horizontal, GB/T 2975 GB/T 4340.1
8 Ultrasonic testing one by one - GB/T 2970
9 non-metallic inclusions 1/batch plate width 1/4, GB/T 10561-2005 GB/T 10561-2005 Method A
10 band structure 1/batch plate width 1/4, GB/T 13298 GB/T 13299
11 grain size 1/batch plate width 1/4, GB/T 6394 GB/T 6394
12 CTOD 1 time plate width 1/4, horizontal, GB/T 21143 GB/T 21143
13 Dimensions and shapes one by one - suitable measuring tools
14 Surface quality by piece - visual
8 Inspection rules
8.1 Inspection and acceptance of steel plates shall be carried out by the supplier quality inspection department.
8.2 Steel plates shall be accepted in batches. Each batch consists of steel plates of the same grade, the same heat number, the same thickness specification and the same delivery state, each batch weight
The amount should not exceed 60t.
8.3 The number of steel plates to be sampled, the sampling department and the sampling method shall comply with the requirements of Table 6.
8.4 If a test result representing a batch of steel plates is unqualified, the manufacturer may choose to take two additional steel plates from the same batch, each steel plate
Re-inspection of unqualified items. If the retest results are all qualified, the batch of steel plates can be accepted except for the unqualified steel plate. If complex
If the test results of any of the steel plates in the test are unqualified, the manufacturer may choose to scrap the whole batch or the sheets of the untested steel plates.
test.
8.5 The test results shall be revised by the comparison method of the repair value, and the repair rules shall comply with the provisions of GB/T 8170.
9 Packaging, marking and quality certificate
The packaging, marking and quality certificate of the steel plate shall comply with the provisions of GB/T 247. If the party has special requirements for packaging, it should be in the contract.
Note.
Appendix A
(informative appendix)
This standard brand is compared with foreign related brands
See Table A.1 for the comparison between the standard grades and the relevant standard grades for steel plates and steel pipes for foreign submarine pipelines.
Table A.1 Comparison table between this standard grade and foreign related grades
This standard grade APISpec5L45th DNV-OS-F101
L245MO/BMO L245MO/BMO SMYS245
L290MO/X42MO L290MO/X42MO SMYS290
L320MO/X46MO L320MO/X46MO SMYS320
L360MO/X52MO L360MO/X52MO SMYS360
L390MO/X56MO L390MO/X56MO SMYS390
L415MO/X60MO L415MO/X60MO SMYS415
L450MO/X65MO L450MO/X65MO SMYS450
L485MO/X70MO L485MO/X70MO SMYS485
L555MO/X80MO L555MO/X80MO SMYS555
Related standard:   GB/T 34200-2017
   
 
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