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GB/T 37602-2019: Ship and offshore engineering steel for low temperature service
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Ship and offshore engineering steel for low temperature service
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GB/T 37602-2019
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Standard similar to GB/T 37602-2019 GB/T 37800 GB/T 38215 GB/T 37599 Basic data | Standard ID | GB/T 37602-2019 (GB/T37602-2019) | | Description (Translated English) | Ship and offshore engineering steel for low temperature service | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H46 | | Classification of International Standard | 77.140.50 | | Word Count Estimation | 14,159 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2020-05-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 37602-2019: Ship and offshore engineering steel for low temperature service---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.
Ship and offshore engineering steel for low temperature service
ICS 77.140.50
H46
National Standards of People's Republic of China
Low temperature toughness steel for marine and marine engineering
2019-06-04 release
2020-05-01 implementation
State Administration of Market Supervision
Published by China National Standardization Administration
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard is proposed by 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. Jiangyin Xingcheng Special Steel Co., Ltd., Metallurgical Industry Information Standards Research Institute, Hunan Hualing Xiangtan Iron & Steel Co., Ltd.
Company, Shougang Group Co., Ltd., Nanjing Iron and Steel Co., Ltd., China Classification Society, Shandong Iron and Steel Co., Ltd. Laiwu Branch.
The main drafters of this standard. Liu Zhaoxia, Xu Guangqin, Di Guobiao, Zhang Weixu, Hou Jie, Luo Deng, Zhang Xiaoxue, Zhao Jie, Du Chuanzhi, Bai Yun, Li Qian,
Wang Zhen, Shen Qinyi, Liu Yong, Zhang Peng, Miao Yifeng, Meng Yu, Jia Zhigang.
Low temperature toughness steel for marine and marine engineering
1 Scope
This standard specifies the designation method, order content, size, shape, weight, and technical requirements of low-temperature toughness steel for ships and marine engineering.
Requirements, test methods, inspection rules, packaging, marking and quality certificates.
This standard applies to carbon-manganese low-temperature steel and nickel-based low-temperature steel for liquefied gas carriers, polar ships and low-temperature marine engineering.
Steel plate larger than 60mm, section steel with thickness or diameter not larger than 50mm (hereinafter referred to as steel).
2 Normative references
The following documents are essential for the application of this document. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB/T 222 steel product chemical composition allowable deviation
GB/T 223.5 Determination of acid-soluble silicon and total silicon content in steel. Reduced silicate molybdate spectrophotometry
GB/T 223.9 Determination of aluminum content in iron, steel and alloys Chromazurol S spectrophotometric method
GB/T 223.12 Methods for chemical analysis of iron, steel and alloys-Sodium carbonate separation-Diphenylcarbazide photometric method for the determination of chromium content
GB/T 223.14 Methods for chemical analysis of iron, steel and alloys Determination of vanadium content by tantalum reagent extraction spectrophotometry
GB/T 223.19 Methods for chemical analysis of iron, steel and alloys-New copperine-chloroform extraction photometric method for determination of copper content
GB/T 223.23 Determination of nickel content in steels and alloys Butadione oxime spectrophotometric method
GB/T 223.25 Methods for chemical analysis of iron, steel and alloys. Determination of nickel content by butanedione oxime gravimetric method
GB/T 223.26 Determination of molybdenum content in steels and alloys thiocyanate spectrophotometric method
GB/T 223.37 Methods for chemical analysis of iron, steel and alloys-Distillation separation-Indophenol blue photometric method for determination of nitrogen content
GB/T 223.40 Determination of niobium content in steels and alloys Chlorosulfenol S spectrophotometric method
GB/T 223.62 Methods for chemical analysis of iron, steel and alloys Determination of phosphorus content by butyl acetate extraction spectrophotometry
GB/T 223.63 Methods for chemical analysis of iron, steel and alloys--The sodium periodate (potassium) spectrophotometric method for the determination of manganese content
GB/T 223.67 Determination of sulfur content in iron, steel and alloys Methylene blue spectrophotometric method
GB/T 223.69 Determination of carbon content in steel and alloys. Gas volume method after combustion in a tube furnace
GB/T 228.1 Tensile test for metallic materials-Part 1. Test method at room temperature
GB/T 229 Charpy pendulum impact test method for metallic materials
GB/T 247 General requirements for packaging, marking and quality certificates of steel plates and strips
GB/T 706 hot rolled section steel
GB/T 709 size, shape, weight and tolerance of hot-rolled steel plate and steel strip
GB/T 2101 General requirements for acceptance, packaging, marking and quality certificate of section steel
GB/T 2975 Sampling location and sample preparation for mechanical properties test of steel and steel products
GB/T 4336 Determination of multi-element content in carbon steel and low-alloy steels by spark discharge atomic emission spectrometry (conventional method)
GB/T 5313 thickness direction steel plate
GB/T 6803 Non-plastic transition temperature drop weight test method for ferritic steel
GB/T 8170 Numerical rounding rules and expression and judgment of limit values
GB/T 17505 General technical conditions for steel and steel product delivery
GB/T 20066 Sampling and sample preparation methods for determination of chemical composition of steel and iron
GB/T 20123 Determination of total carbon and sulfur content in iron and steel. Infrared absorption method after combustion in high frequency induction furnace (conventional method)
GB/T 20124 Determination of nitrogen content in iron and steel. Inert gas fusion thermal conductivity method (conventional method)
GB/T 20125 Determination of multi-element content in low alloy steels by inductively coupled plasma emission spectrometry
GB/T 21143 Unified test method for quasi-static fracture toughness of metallic materials
NB/T 47013.3 Non-destructive testing of pressure equipment. Part 3. Ultrasonic testing
3 Grade indication method
3.1 The steel grade, thickness direction (Z direction) performance level and classification shall meet the requirements of Table 1.
Table 1 Steel grades, thickness direction (Z direction) performance levels and classification
Grade thickness direction (Z direction) grade classification
LT32-1, LT32-2, LT32-3
LT36-1, LT36-2, LT36-3
LT40-1, LT40-2, LT40-3
Z25, Z35 carbon-manganese low temperature steel
0.5NiA, 0.5NiB, 1.5Ni, 2.25Ni
3.5Ni, 5Ni, 9Ni
Z25, Z35 nickel series low temperature steel
3.2 The grade of carbon-manganese low-temperature steel consists of the first letter LT representing the English lowtemperature of low temperature, the specified yield strength level, and the low-temperature toughness.
Sex level (1, 2 and 3) consists of 3 parts. The grade of nickel-based low temperature steel consists of the average content of nickel and the symbol of chemical element (Ni).
composition.
Example 1. LT32-2.
LT --- represents the first letter LT of English Lowtemperature;
32 --- represents the specified yield strength level;
2 --- represents low temperature toughness level.
Example 2. 3.5Ni.
3.5 --- Arabic numbers representing the average content (mass fraction) of the nickel element;
Ni --- a chemical element symbol representing nickel.
3.3 When the purchaser requires the steel plate to have the thickness direction performance, add the representative thickness direction (Z direction) performance level after the grade specified in Table 1.
Symbol, for example. LT32-2-Z35.
4 Order content
A contract or order placed under this standard shall include the following.
a) the number of this standard;
b) grades;
c) specifications;
d) weight (quantity);
e) dimensional and unevenness accuracy;
f) delivery status;
g) Special requirements.
5 Size, shape, weight
5.1 The size, shape, weight and allowable deviation of the steel plate shall meet the requirements of GB/T 709.The deviation under the thickness of the steel plate is limited to -0.3mm, and
Should ensure that the average thickness of the steel plate is not less than the nominal thickness.
5.2 The size, shape, weight and allowable deviation of section steel shall meet the requirements of GB/T 706.
5.3 The density of 9Ni steel shall be implemented as 7.89g/cm3, and the density of other steel grades shall be implemented as 7.85g/cm3.
6 Technical requirements
6.1 Grade and chemical composition
6.1.1 The grade and chemical composition (smelting analysis) of the steel shall meet the requirements in Table 2.
Table 2 Steel grades and chemical composition (smelting analysis)
Grade
Chemical composition a, b, c (mass fraction) /%
C Mn Si PS Ni other elements
LT32-1
LT32-2
LT36-1
LT36-2
LT40-1
LT40-2
≤0.18
LT32-3
LT36-3
LT40-3
≤0.16
0.70 ~ 1.60 0.10 ~ 0.50 ≤0.025 ≤0.025 ≤0.80
Cu≤0.35
Cr≤0.25
Mo≤0.08
Nb≤0.05
V≤0.10
Als ≥ 0.015
N≤0.015
0.5NiA ≤0.14 0.70 ~ 1.50 0.10 ~ 0.50 ≤0.025 ≤0.010 0.15 ~ 0.80
0.5NiB ≤0.16 0.85 ~ 1.70 0.10 ~ 0.50 ≤0.025 ≤0.010 0.15 ~ 0.85
1.5Ni ≤0.14 0.30 ~ 1.50 0.10 ~ 0.35 ≤0.025 ≤0.020 1.30 ~ 1.70
2.25Ni ≤0.13 0.30 ~ 1.50 0.10 ~ 0.35 ≤0.025 ≤0.020 2.00 ~ 2.50
3.5Ni ≤0.12 0.30 ~ 0.80 0.10 ~ 0.35 ≤0.025 ≤0.020 3.20 ~ 3.80
5Ni ≤0.12 0.30 ~ 0.90 0.10 ~ 0.35 ≤0.025 ≤0.020 4.70 ~ 5.30
9Ni ≤0.10 0.30 ~ 0.90 0.10 ~ 0.35 ≤0.025 ≤0.020 8.50 ~ 10.0
Cu≤0.35
Cr≤0.25
Mo≤0.08
Als ≥ 0.015
N≤0.012
a For 0.5NiA and 0.5NiB, Cr Mo Cu≤0.50%; for 1.5Ni ~ 9Ni, Cr Mo Cu≤0.60%.
b For 0.5NiA and 0.5NiB with a thickness of not less than 40mm, the lower limit of the Ni content is 0.30%.
c The content of acid-soluble aluminum (Als) can be replaced by the total aluminum (Alt) content. At this time, Alt should not be less than 0.020%.
6.1.2 According to the requirements of the acquirer, each grade can provide the smelting analysis carbon equivalent (Ceq), the value of which is to be determined by both parties. Carbon Equivalent (Ceq)
Equation (1) calculates.
Ceq = C Mn/6 (Cr Mo V)/5 (Ni Cu)/15 (1)
6.1.3 When the purchaser requires to guarantee the thickness direction performance of the steel sheet, the S content shall meet the requirements of GB/T 5313.
6.1.4 The allowable deviation of the chemical composition of the finished steel shall meet the requirements of GB/T 222.
6.2 Smelting method
Steel is smelted by converter or electric furnace and should be refined outside the furnace. All steels should be killed steel with aluminum deoxidation.
6.3 Delivery status
The delivery status of the steel shall meet the requirements in Table 3.
Table 3 Delivery status
Classification grade delivery status
Carbon-manganese low temperature steel
LT32-1, LT32-2, LT32-3
LT36-1, LT36-2, LT36-3
LT40-1, LT40-2, LT40-3
Controlled rolling, thermo mechanical rolling (TMCP), normalizing or quenching and tempering
Nickel low temperature steel
0.5NiA, 0.5NiB, 1.5Ni, 2.25Ni, 3.5Ni Thermomechanical rolling (TMCP), normalizing, normalizing or tempering
5Ni normalized, normalized or tempered
9Ni twice normalized or tempered
6.4 Mechanical properties
6.4.1 The mechanical properties of steel shall meet the requirements in Table 4.
Table 4 Mechanical properties
Grade
Stretching test
Upper yield strength
ReH/MPa
not less than
tensile strength
Rm/MPa
Elongation after breaking
A /%
not less than
Charpy (V-notch) impact testa
Material thickness
t/mm
Test temperature
T/℃
Impact absorption energy KV2/J
Portrait Landscape
not less than
Minimum design
Temperature/℃
LT32-1 315 440 ~ 570 22
≤25 -20
> 25 ~ 30 -25
> 30 ~ 35 -30
> 35 ~ 40 -35
> 40 ~ 60 -40
41 27 -15
LT32-2 315 440 ~ 570 22
≤25 -40
> 25 ~ 30 -45
> 30 ~ 35 -50
> 35 ~ 40 -55
> 40 ~ 60 -60
41 27 -35
LT32-3 315 440 ~ 570 22
≤25 -60
> 25 ~ 30 -65
> 30 ~ 35 -70
> 35 ~ 40 -75
> 40 ~ 60 -80
41 27 -55
Table 4 (continued)
Grade
Stretching test
Upper yield strength
ReH/MPa
not less than
tensile strength
Rm/MPa
Elongation after breaking
A /%
not less than
Charpy (V-notch) impact testa
Material thickness
t/mm
Test temperature
T/℃
Impact absorption energy KV2/J
Portrait Landscape
not less than
Minimum design
Temperature/℃
LT36-1 355 490 ~ 630 21
≤25 -20
> 25 ~ 30 -25
> 30 ~ 35 -30
> 35 ~ 40 -35
> 40 ~ 60 -40
41 27 -15
LT36-2 355 490 ~ 630 21
≤25 -40
> 25 ~ 30 -45
> 30 ~ 35 -50
> 35 ~ 40 -55
> 40 ~ 60 -60
41 27 -35
LT36-3 355 490 ~ 630 21
≤25 -60
> 25 ~ 30 -65
> 30 ~ 35 -70
> 35 ~ 40 -75
> 40 ~ 60 -80
41 27 -55
LT40-1 390 510 ~ 660 20
≤25 -20
> 25 ~ 30 -25
> 30 ~ 35 -30
> 35 ~ 40 -35
> 40 ~ 60 -40
41 27 -15
LT40-2 390 510 ~ 660 20
≤25 -40
> 25 ~ 30 -45
> 30 ~ 35 -50
> 35 ~ 40 -55
> 40 ~ 60 -60
41 27 -35
LT40-3 390 510 ~ 660 20
≤25 -60
> 25 ~ 30 -65
> 30 ~ 35 -70
> 35 ~ 40 -75
> 40 ~ 60 -80
41 27 -55
Table 4 (continued)
Grade
Stretching test
Upper yield strength
ReH/MPa
not less than
tensile strength
Rm/MPa
Elongation after breaking
A /%
not less than
Charpy (V-notch) impact testa
Material thickness
t/mm
Test temperature
T/℃
Impact absorption energy KV2/J
Portrait Landscape
not less than
Minimum design
Temperature/℃
0.5NiA 285 420 ~ 530 24
≤25 -60
> 25 ~ 30 -65
> 30 ~ 35 -70
> 35 ~ 40 -75
> 40 ~ 60 -80
41 27 -55
0.5NiB 355 490 ~ 610 22
≤25 -60
> 25 ~ 30 -65
> 30 ~ 35 -70
> 35 ~ 40 -75
> 40 ~ 60 -80
41 27 -55
1.5Ni 275 470 ~ 640 22
≤25 -65
> 25 ~ 30 -70
> 30 ~ 35 -75
> 35 ~ 40 -80
> 40 ~ 60 -85
41 27 -60
2.25Ni 305 500 ~ 660 22
≤25 -70
> 25 ~ 30 -75
> 30 ~ 35 -80
> 35 ~ 40 -85
> 40 ~ 60 -90
41 27 -65
3.5Ni 345 440 ~ 690 21
≤25 -95
> 25 ~ 30 -100
> 30 ~ 35 -105
> 35 ~ 40 -110
> 40 ~ 60 -115
41 27 -90
5Ni 390 520 ~ 710 21
≤25 -110
> 25 ~ 30 -115
> 30 ~ 35 -120
> 35 ~ 40 -125
> 40 ~ 60 -130
41 27 -105
9Ni 490 640 ~ 830 19 ≤60 -196 41 27 -165
a The horizontal value of shock absorption energy is applicable to steel plates, and the vertical value is applicable to profile steels.
6.4.2 Charpy (V-notch) shock absorption energy is calculated based on the arithmetic mean of 3 samples
The specified value in Table 4 is low, but it should not be lower than 70% of the specified value.
6.4.3 Thickness (Z-direction) performance The reduction in thickness in the thickness direction shall meet the requirements of GB/T 5313.
6.5 Surface quality
6.5.1 There should be no cracks, bubbles, scars, folds or pressing on the steel surface which are harmful to use. Steel should not be visual
Visible layers.
6.5.2 The surface of the steel is allowed to have a thin layer of iron oxide scale, rust that does not hinder the inspection of the surface defects, and the inferiority caused by the iron oxide scale falling off.
Significant surface roughness, indentation and other local defects, but its depth should not be greater than half of the thickness tolerance, and the minimum allowable steel should be guaranteed
thickness.
6.5.3 When there are harmful defects on the steel surface, cleaning is allowed. The cleaning place should be smooth without edges and corners, and the minimum allowable thickness of the steel should be guaranteed.
6.5.4 The steel shall not be repaired.
6.6 Nondestructive testing
6.6.1 Thickness (Z direction) performance steel plates shall be subjected to ultrasonic testing one by one.The testing method shall be in accordance with NB/T 47013.3.
The supply and demand sides negotiate and determine. After the supply and demand parties negotiate and indicate in the contract, other testing methods and qualification levels can be determined.
6.6.2 According to the requirements of the purchaser, non-destructive testing of other steels can also be carried out after consultation between the supply and demand parties.
6.7 Special requirements
According to the requirements of the purchaser, the drop hammer test, the crack tip opening displacement (CTOD) test, and the residual magnetism test can be performed after consultation between the supply and demand sides.
7 Test method
7.1 Chemical composition
The chemical composition analysis of steel is usually carried out according to GB/T 4336, GB/T 20123, GB/T 20124 or other general methods.
Press GB/T 223.5, GB/T 223.9, GB/T 223.12, GB/T 223.14, GB/T 223.19, GB/T 223.23, GB/T 223.25,
GB/T 223.26, GB/T 223.37, GB/T 223.40, GB/T 223.62, GB/T 223.63, GB/T 223.67, GB/T 223.69 or
GB/T 20125.
7.2 Other inspection items
The test method for each batch of steel inspection items shall meet the requirements of Table 5.
Table 5 Inspection items, sampling quantity, sampling method and test method
Sampling method Sampling method Test method
1 chemical composition 1 per furnace GB/T 20066 see 7.1
2 Tensile test 1/batch GB/T 2975 GB/T 228.1
3 Impact test 3/batch GB/T 2975 GB/T 229
4 Tensile test in thickness direction 3/batch GB/T 5313 GB/T 5313
5 Nondestructive testing one by one-NB/T 47013.3
6 drop weight test 2/furnace quarter width, sampling on the thickest steel plate GB/T 6803
Table 5 (continued)
Sampling method Sampling method Test method
Crack tip opening displacement
(CTOD)
3/quarter width of furnace, sampling on the thickest steel plate GB/T 21143
8 Residual magnetic piece by piece/piece by piece-negotiation
9 Surface quality piece by piece/piece by piece-visual inspection and measurement
10 Dimensions and Shapes Sheet by Piece/Piece-Appropriate Gages for Accuracy
7.3 Small size specimen impact test
The impact test specimens of steel plates shall be transverse specimens, and the impact test specimens of profile steels shall be longitudinal specimens. For steel plates with a thickness of less than 12mm,
Charpy (V-notch) impact test is performed with a small-sized sample.When the thickness of the steel plate is> 8mm ~ < 12mm, the sample size is 7.5mm ×
When the thickness is 10mm × 55mm and the steel plate thickness is 6mm ~ 8mm, the sample size is 5mm × 10mm × 55mm. Less than 6mm
The steel plate may not be subjected to an impact test. The conversion relationship between the impact absorption energy of the small sample and the standard sample is shown in Table 6.
Table 6 Conversion relationship between impact absorption energy of small-size samples and standard samples
Conversion factor of width of small sample/mm and impact absorption energy of standard sample
7.5 5/6
5 2/3
7.4 Dimension inspection
7.4.1 The size and shape of the steel shall be checked with suitable measuring tools.
7.4.2 The average thickness of the steel plate is measured as follows.
a) The average thickness of the steel plate can be measured by automatic or manual methods;
b) Measurement position of the side of the steel plate. When using the automatic method to measure, the distance from the side to the side is not less than 10mm and not more than 300mm.
Measurement within the area; when measuring by manual method, measure within a range of not less than 10mm and not more than 100mm from the side;
c) Refer to Figure 1 for the schematic diagram of the average thickness measurement of the steel plate. As shown in Figure 1, select at least two lines for measurement, and select at least three for each line.
Measurement points (when there are more than 3 measurement points, the measurement points of each line should be consistent), and the average thickness of the steel plate is calculated according to the average value.
Figure 1 Schematic diagram of average thickness measurement of steel plates
8 Inspection rules
8.1 Inspection and acceptance of steel shall be carried out by the supplier's quality supervision and inspection department.
8.2 Steel plates shall be accepted in batches. Each batch of steel plates shall consist of steel plates of the same grade, same furnace number, same thickness, and the same rolling or heat treatment system.
Among them, steel sheets delivered in thermomechanical rolling (TMCP) and controlled rolling conditions should be sampled one by one, normalizing, normalizing and tempering, twice normalizing and tempering,
Quenching and tempering should be sampled by heat treatment.
8.3 Section steels shall be batches with the same furnace number, same specifications, the same rolling method and the same heat treatment system (maximum weight of each batch is 10t).
8.4 The batch of steel plates with performance requirements in the thickness direction shall meet the requirements of GB/T 5313.
8.5 The sampling quantity and sampling method of each batch of steel shall meet the requirements in Table 5.
8.6 The re-inspection and determination rules for the mechanical properties of steel plates shall meet the requirements of GB/T 17505.
8.7 The re-inspection and determination rules for the mechanical properties of section steel shall meet the requirements of GB/T 2101.
8.8 The re-inspection and judgment rules of the Z-direction steel thickness direction shall comply with the requirements of GB/T 5313.
8.9 The test results of mechanical properties and chemical composition are compared by the rounded value comparison method. The rounded rules shall meet the requirements of GB/T 8170.
9 Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel shall meet the requirements of GB/T 247 and GB/T 2101.
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