Valid

GB/T 35012-2018Chromium molybdenum alloy steel plate for hydrogen service equipment (English PDF)

Preview PDF

Also coversGBT35012-2018

This is a limited preview

Buy now to download the full PDF (20 pages)

Need quotation for your management?

Get a formal quotation for GB/T 35012-2018 in 30 minutes.

Issued by

State Administration for Market Regulation

Level / Type

National · Recommended

Issue date

May 14, 2018

Implementation date

February 1, 2019

Scope

GB/T 35012-2018 (Chromium molybdenum alloy steel plate for hydrogen service equipment) is available as an English-translated PDF.

GB/T 35012-2018 is the Chinese standard "Chromium molybdenum alloy steel plate for hydrogen service equipment".

Its scope clause reads: This Standard specifies the ordering content, designation representation, dimensions, shape, weight and tolerances, technical requirements, test methods, inspection rules, packaging, marking, and quality certificate, etc. of chromium molybdenum alloy steel plate for hydrogen service equipment.

This Standard is applicable to the manufacture of chromium molybdenum alloy steel plate (hereinafter known as steel plate for short) with a thickness of 6 mm ~ 200 mm for hydrogen service equipment of petrochemical and coal chemical industry.

Its clauses include ordering content; designation representation; test methods. It was issued by the State Administration for Market Regulation on 2018-05-14 and took effect on 2019-02-01.

Found what you need?

Document preview — GB/T 35012-2018

National Standard of the People's Republic of China

ICS: 77.140.50
Classification: H 46

Issued by: State Administration for Market Regulation

Foreword...3
1 Scope...4
2 Normative references...4
3 Ordering content...7
4 Designation representation...7
5 Dimensions, shape, weight...8
6 Technical requirements...8
7 Test methods...13
8 Inspection rules...15
9 Packaging, marking, and quality certificate...15
Appendix A (Informative) Definition of heat treatment...16
Appendix B (Normative) Step cooling test...18
Appendix C (Normative) Special requirements...20

1 Scope

This Standard specifies the ordering content, designation representation, dimensions, shape, weight and tolerances, technical requirements, test methods, inspection rules, packaging, marking, and quality certificate, etc. of chromium molybdenum alloy steel plate for hydrogen service equipment.

This Standard is applicable to the manufacture of chromium molybdenum alloy steel plate (hereinafter known as steel plate for short) with a thickness of 6 mm

~ 200 mm for hydrogen service equipment of petrochemical and coal chemical industry.

2 Normative references

The following documents are indispensable for the application of this document.

For the dated references, only the versions with the dates indicated are applicable to this document. For the undated references, the latest version (including all the amendments) are applicable to this document.

GB/T 223.9 Iron steel and alloy - Determination of aluminium content -

Chrome azurol S photometric method

GB/T 223.11 Iron, steel and alloy - Determination of chromium content -

Visual titration or potentiometric titration method

GB/T 223.14 Methods for chemical analysis of iron, steel and alloy - The N- benzoyl-N-phenylhydroxylamine extraction photometric method for the determination of vanadium content

GB/T 223.17 Methods for chemical analysis of iron, steel and alloy - The diantipyrylmethane photometric method for the determination of titanium content

GB/T 223.18 Methods for Chemical Analysis of Iron, Steel and Alloy - The

Sodium Thiosulfate Separation Iodimetric Method for the Determination of

Copper Content

GB/T 223.23 Iron, Steel and Alloy - Determination of Nickel Content - The

Dimethylglyoxime Spectrophotometric Method

GB/T 223.26 Iron, Steel and Alloy - Determination of Molybdenum Content -

The Thiocyanate Spectrophotometric Method

GB/T 223.31 Iron, steel and alloy - Determination of arsenic content -

Distillation-molybdenum blue spectrophotometric method

GB/T 223.37 Methods for chemical analysis of iron, steel and alloy - The indophenol blue photometric methods for the determination of nitrogen content after distillation separation

GB/T 223.40 Iron, Steel and Alloy - Determination of Niobium Content by the

Sulphochlorophenol S Spectrophotometric Method

GB/T 223.47 Methods for chemical analysis of iron, steel and alloy - The carrier precipitation-molybdenum blue photometric method for the determination of antimony content

GB/T 223.50 Methods for chemical analysis of iron, steel and alloy - The phenylfuorone-CTMAB direct photometric method for the determination of tin content

GB/T 223.60 Methods for chemical analysis of iron, steel and alloy - The perchloric acid dehydration gravimetric method for the determination of silicon content

GB/T 223.62 Methods for chemical analysis of iron, steel and alloy - The butyl acetate extraction photometric method for the determination of phosphorus content

GB/T 223.63 Methods for chemical analysis of iron, steel and alloy - The sodium (potassium) periodate photometric method for the determination of manganese content

GB/T 223.67 Iron, Steel and Alloy - Determination of Sulfur Content -

Methylene Blue Spectrophotometric Method

GB/T 223.69 Iron, Steel and Alloy - Determination of Carbon Contents - Gas- volumetric Method after Combustion in the Pipe Furnace

GB/T 223.75 Iron, steel and alloy - Determination of boron content - Methanol distillation-curcumin photometric method

GB/T 223.76 Methods for chemical analysis iron, steel and alloy - The flame atomic absorption spectrometric method for the determination of vanadium content

GB/T 223.77 Methods for chemical analysis of iron, steel and alloy - The

GB/T 17505 Steel and steel products - General technical delivery requirements

GB/T 20066 Steel and Iron - Sampling and Preparation of Samples for the

Determination of Chemical Composition

GB/T 20123 Steel and iron - Determination of total carbon and sulfur content

Infrared absorption method after combustion in an induction furnace (routine method)

GB/T 20124 Steel and iron - Determination of nitrogen content - Thermal conductimetric method after fusion in a current of inert gas

NB/T 47013.3-2015 Nondestructive testing of pressure equipment - Part 3.

Ultrasonic testing

3 Ordering content

Contracts or orders for ordering in accordance with this Standard shall include the following.

a) Standard number;

b) Designation;

c) Dimensions;

d) Delivery state;

e) Weight;

f) Impact test temperature of 14Cr1MoR(H);

g) Specific holding temperature of 15CrMoR(H), 14Cr1MoR(H) in Table 8;

h) The heating rate, cooling rate, and holding time in Table 8;

i) Whether 12Cr2Mo1R(H), 12Cr2Mo1VR(H) are subjected to a step cooling test;

j) Sampling quantity and inspection location for Brinell hardness in Table 9;

k) Special requirements.

4 Designation representation

6.6 Nondestructive testing

The steel plate shall be subjected to ultrasonic testing one by one and shall comply with the Class I requirements of NB/T 47013.3-2015.

6.7 Surface quality

6.7.1 There shall be no defects which affect the use such as cracks, bubbles, scarring, folding, and inclusions on the surface of steel plate. The steel plate shall not have visible delamination. If there are the above surface defects, cleaning is allowed. The cleaning depth is calculated from the actual dimension of steel plate and shall not exceed half the thickness tolerance of the steel plate;

and the minimum thickness of the steel plate shall be ensured. The defect cleaning area shall be smooth and free of edges and corners.

6.7.2 Other defects are allowed. The depth is calculated from the actual dimension of steel plate and shall not exceed half the allowable tolerance of the thickness. It shall ensure that the thickness of steel plate at the defect is not less than the minimum allowable thickness of the steel plate.

6.7.3 Steel plates are not allowed to be welding-repaired.

6.8 Step cooling test

According to the requirements of the purchaser and stated in the contract,

12Cr2Mo1R(H) and 12Cr2Mo1VR(H) shall be subjected to step cooling test in accordance with Appendix B. SEE Appendix A for the definition of step cooling heat treatment.

6.9 Special requirements

According to the requirements of the purchaser, negotiated between the supplier and the purchaser and indicated in the contract, the corresponding special requirements shall be selected according to Appendix C.

7 Test methods

7.1 The test method for chemical composition of steel shall be in accordance with GB/T 223.9, GB/T 223.11, GB/T 223.14, GB/T 223.17, GB/T 223.18, GB/T

223.23, GB/T 223.26, GB/T 223.31, GB/T 223.37, GB/T 223.40, GB/T 223.47,

GB/T 223.50, GB/T 223.60, GB/T 223.62, GB/T 223.63, GB/T 223.67, GB/T

223.69, GB/T 223.75, GB/T 223.76, GB/T 223.77, GB/T 223.80, GB/T 223.82,

GB/T 4336, GB/T 11261, GB/T 20123, GB/T 20124 or general test methods.

Arbitration shall be in accordance with the provisions of GB/T 223.9, GB/T

223.11, GB/T 223.14, GB/T 223.17, GB/T 223.18, GB/T 223.23, GB/T 223.26,

GB/T 223.31, GB/T 223.37, GB/T 223.40, GB/T 223.47, GB/T 223.50, GB/T

223.60, GB/T 223.62, GB/T 223.63, GB/T 223.67, GB/T 223.69, GB/T 223.75,

GB/T 223.76, GB/T 223.77, GB/T 223.80, GB/T 223.82.

Appendix A (Informative)

Definition of heat treatment

A.1 Scope

This appendix defines the maximum simulated post-weld heat treatment, the minimum simulated post-weld heat treatment, and step cooling heat treatment.

A.2 Maximum simulated post-weld heat treatment

15CrMoR(H), 14Cr1MoR(H).

Maximum simulated post-weld heat treatment. specific heat treatment of the sample, used to simulate all manufacturing heat treatments, including austenitizing and tempering, final post-weld heat treatment, a possible manufacturer rework of post-weld heat treatment cycle, minimum additional post-weld heat treatment which the owner may use in the future.

12Cr2Mo1R(H), 12Cr2Mo1VR(H).

Maximum simulated post-weld heat treatment. specific heat treatment of the sample, used to simulate all manufacturing heat treatments, including austenitizing and tempering, all intermediate heat treatments above 482 °C, final post-weld heat treatment, a possible manufacturer rework of post-weld heat treatment cycle, minimum additional post-weld heat treatment which the owner may use in the future.

Note. To determine the equivalent time for a temperature (within the range of simulated post-weld heat treatment), the Larson-Miller parameter can be used.

A.3 Minimum simulated post-weld heat treatment

15CrMoR(H), 14Cr1MoR(H).

Minimum simulated post-weld heat treatment. specific heat treatment of the sample, used to simulate the minimum heat treatment (austenitizing, tempering, and one post-weld heat treatment cycle).

12Cr2Mo1R(H), 12Cr2Mo1VR(H).

Minimum simulated post-weld heat treatment. specific heat treatment of the sample, used to simulate the minimum heat treatment (austenitizing, tempering, one post-weld heat treatment cycle, and intermediate stress release above 482 °C).

Note. To determine the equivalent time for a temperature (within the range of simulated post-weld heat treatment), the Larson-Miller parameter can be used.

Appendix B (Normative)

Step cooling test

B.1 Test frequency

The steel plates of the same furnace (tank) number, the same thickness, and the same heat treatment system are taken as one group. The steel plate with the highest coefficient J for product analysis is selected from each group for step cooling test.

B.2 Sample and heat treatment requirements

B.2.1 2 groups of Charpy V-notch samples (at least 24 samples per group) shall be prepared and subjected to the following heat treatment.

a) Group 1 sample - minimum post-weld heat treatment, to determine the transformation temperature curve prior to the step cooling heat treatment.

b) Group 2 sample - minimum post-weld heat treatment plus the following step cooling heat treatment, to determine the transformation temperature curve after the step cooling heat treatment.

B.2.2 The step cooling heat treatment shall meet the following requirements.

1) HEAT to 316 °C. The heating rate is not strictly required;

2) HEAT to 593 °C at a heating rate of no more than 56 °C/h, and KEEP for

1 h;

3) COOL to 538 °C at a cooling rate of no more than 6 °C/h, and KEEP for

15 h;

4) COOL to 524 °C at a cooling rate of no more than 6 °C/h, and KEEP for

24 h;

5) COOL to 496 °C at a cooling rate of no more than 6 °C/h, and KEEP for

60 h;

6) COOL to 468 °C at a cooling rate of no more than 3 °C/h, and KEEP for

100 h;

7) COOL to 316 °C at a cooling rate of no more than 28 °C/h;

8) COOL to ambient temperature in still air.

B.2.3 After heat treatment, each group of samples shall be subjected to the impact test at the selected 8 test temperatures, 1 of which shall be -30 °C. 3

Appendix C (Normative)

Special requirements

C.1 Designation

According to the requirements of the purchaser, the steel designation can also be composed of Chinese characters representing hydrogen service and the corresponding designation in GB/T 713-2014, such as the Chinese characters

15CrMoR. When the steel designation is expressed in such a way, its technical requirements shall be consistent with those of the corresponding designations in Table C.1 of this Standard.

The comparison between the designations in this clause and the designations in the Standard text is given in Table C.1.

Table C.1 -- Comparison of designations

LinQing 15CrMoR 15CrMoR(H)

LinQing 14Cr1MoR 14Cr1MoR(H)

LinQing 12Cr2Mo1R 12Cr2Mo1R(H)

LinQing 12Cr2Mo1VR 12Cr2Mo1VR(H)

[Translator’s note. Chinese Pinyin “LinQing” means hydrogen service.]

C.2 Thickness tolerance

The thickness tolerance shall be in accordance with the Class C requirements in GB/T 709-2006.

C.3 Chemical composition (smelting analysis and product analysis)

C.3.1 The P content in steel shall be no more than 0.007%.

C.3.2 For 15CrMoR(H), 14Cr1MoR(H), and 12Cr2Mo1R(H), when the Z35

grade through-thickness characteristics are required, the S content shall meet the corresponding requirements of GB/T 5313.

C.3.3 The total aluminium (Alt) content of steel shall comply with the requirements of Table C.2.

......

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 20 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 223.9 · GB/T 223.17 · GB/T 223.67 · GB/T 223.75

How to Download GB/T 35012-2018

1
Add to cart
Click "Download PDF" on this page and choose "Buy this standard". You can add more standards before checkout.
2
Checkout
Enter your email and billing details. Payment is processed securely by Stripe (cards or bank transfer). Prefer bank details? Request a quotation (min. order $300).
3
Instant delivery (0–9 sec)
Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
4
Invoice included
A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.