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GB/T 32255-2015General martensitic stainless steel and alloy steel castings suitable for high temperature and high pressure service (English PDF)

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Issued by

General Administration of Quality Supervision, Inspection and Quarantine

Level / Type

National · Recommended

Issue date

December 10, 2015

Implementation date

July 1, 2016

Scope

GB/T 32255-2015 (General martensitic stainless steel and alloy steel castings suitable for high temperature and high pressure service) is available as an English-translated PDF.

GB/T 32255-2015 — This standard specifies the technical requirements, test methods, inspection rules, marking, storage, packing and transportation requirements for General martensitic stainless steel and alloy steel castings suitable for high temperature and high pressure service.

This standard is applicable to cast valves, flanges, and pipe fittings used at working temperature not higher than 600 °C; AND other castings for high temperature and high pressure service may refer to this standard.

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Document preview — GB/T 32255-2015

National Standard of the People's Republic of China

ICS: 77.140.80
Classification: J 31

Issued by: General Administration of Quality Supervision, Inspection and Quarantine

Foreword...3
1 Scope...4
2 Normative references...4
3 Technical requirements...6
4 Test methods...10
5 Inspection rules...11
6 Marking, storage, packaging and transportation...14

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard was proposed by AND shall be under the jurisdiction of National

Foundry Standardization Technical Committee (SAC/TC 54).

The drafting organizations of this standard. China Nuclear Valve Factory

Hengdian Machinery Co., Ltd., Shanghai Honggang Power Equipment Casting

and Forging Co., Ltd., Chinese Academy of Sciences Institute of Metal

Research, Anhui Yingliu Group Huoshan Casting Co., Ltd., KOCEL Cast Steel

Co., Ltd. Shenyang Casting Research Institute.

1 Scope

This standard specifies the technical requirements, test methods, inspection

rules, marking, storage, packing and transportation requirements for General

martensitic stainless steel and alloy steel castings suitable for high temperature

and high pressure service.

This standard is applicable to cast valves, flanges, and pipe fittings used at

working temperature not higher than 600 °C; AND other castings for high

temperature and high pressure service may refer to this standard.

2 Normative references

The following documents are essential to the application of this document. For

the dated documents, only the versions with the dates indicated are applicable

to this document; for the undated documents, only the latest version (including

all the amendments) are applicable to this Standard.

GB/T 222 Permissible tolerances for chemical composition of steel products

GB/T 223.4 Alloyed steel - Determination of manganese content -

Potentiometric or visual titration method

GB/T 223.5 Method for chemical analysis of iron, steel and alloy - The

reduced molybdosilicate spectrophotometric method for the determination of

acid-soluble silicon content

GB/T 223.9 Iron, steel and alloy - Determination of aluminum content –

Chrom azurol S spectrophotometric method

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

Visible titration or potentiometric titration method

GB/T 223.14 Method for chemical analysis of iron, steel and alloy - The N-

Benzoy-N-Phenylhydroxylamine extraction photometric method for the

determination of vanadium 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 223.36 Method for chemical analysis of iron, steel and alloy – The

neutral titration method for the determination of nitrogen content after

distillation separation

GB/T 223.40 Iron, steel and alloy - Determination of niobium content by the

Chlorosulfonol S spectrophotometric method

GB/T 223.43 Iron, steel and alloy - Determination of tungsten content -

Gravimetric method and spectrophotometric method

GB/T 223.59 Iron, steel and alloy - Determination of phosphorus content -

Bismuth phosphomolybdate blue spectrophotometric method and antimony

phosphomolybdate blue spectrophotometric method

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 - Gas-volumetric

method after combustion in pipe furnaces

GB/T 228.1 Metallic materials - Tensile testing - Part 1. Method of test at

room temperature

GB/T 229 Metallic materials - Charpy pendulum impact test method

GB/T 4336 Carbon and low-alloy steel - Determination of multi-element

contents - Spark discharge atomic emission spectrometric (Routine method)

GB/T 5677 Radiographic testing for steel castings

GB/T 6060.1 Roughness comparison specimens - Cast surfaces

GB/T 6414 Castings - System of dimensional tolerance and machining

allowances

GB/T 7233.2 Steel castings - Ultrasonic examination - Part 2. Steel castings

for highly stressed components

3.7.3 The welders undertaking welding repair work shall have corresponding

qualifications.

3.7.4 Unless otherwise agreed by the supplier and the buyer, if the depth of the

welding groove (pit) exceeds 40% of the wall thickness OR 25 mm (whichever

is the less), it belongs to major welding repair, which shall be agreed in advance

by the buyer, AND be with such records as welding conditions, welding repair

location, scope and so on.

3.7.5 It shall select suitable welding consumables AND finish the welding

procedure assessment, before welding. As for the casting to be subjected to

major welding repair, it shall be subjected to post-weld heat treatment.

3.7.6 After welding repair, the castings shall be inspected in accordance with

the same standard for castings inspection.

3.8 Correction

If the castings have deformation, it is allowed to correct it; AND the corrected

castings shall be subjected to stress relief treatment.

4 Test methods

4.1 Chemical analysis

4.1.1 Chemical composition arbitration analysis method shall be in accordance

with GB/T 223.4, GB/T 223.5, GB/T 223.9, GB/T 223.11, GB/T 223.14, GB/T

223.23, GB/T 223.26 , GB/T 223.36, GB/T 223.40, GB/T 223.43, GB/T 223.59,

GB/T 223.67, and GB/T 223.69.

4.1.2 Spectral analysis shall be conducted in accordance with the provisions of

GB/T 4336.

4.2 Mechanical properties test

4.2.1 Tensile test shall be conducted in accordance with GB/T 228.1.

4.2.2 The impact test shall be conducted in accordance with the provisions of

GB/T 229.

4.3 Non-destructive testing

4.3.1 Unless otherwise specified, the casting surface magnetic particle testing

shall be conducted in accordance with the provisions of GB/T 9444.

sample's impact value to be below the value as specified in Table 2, BUT it shall

not be less than 2/3 of the specified value.

5.2.6 The test results of mechanical properties that do not meet the specified

requirements are considered to be invalid for the following reasons.

a) The sample is not properly installed OR the test machine is not functioning

properly;

b) The tensile test sample breaks apart beyond the gauge length;

c) Improper sample preparation;

d) There is an abnormality in the sample.

In the case of one of the above cases, it shall take sample from the same test

block (casting) or another test block (casting) of same batch to conduct test

again, AND the test results can replace the bad test results.

5.2.7 Where the results of the mechanical properties test are not satisfactory

AND are not due to the reasons listed in 5.2.6, it is allowed to use the standby

sample from the same furnace to conduct re-test. As for the tensile test, TAKE

2 samples for re-test; if the test results of the both samples are qualified, this

tensile test can be judged as qualified; otherwise it is not qualified. As for the

impact test, TAKE 3 samples for re-test; if the test results of the 3 samples are

qualified, AND the arithmetic mean value of the 6 samples (3 for initial test and

3 for re-test) is also qualified, the impact test results can be judged as qualified;

otherwise it is not qualified.

5.2.8 When the results of the mechanical properties re-test still do not meet the

requirements in Table 2, it is allowed to make the castings and test pieces be

subjected to heat treatment again, AND then conduct re-test in accordance with

5.2.4 or 5.2.5. Unless otherwise agreed by the buyer, the number of re-heat

treatment shall not exceed 2 (except for tempering).

5.3 Appearance quality

The appearance quality of the castings shall be inspected in accordance with

3.5 one by one.

5.4 Non-destructive testing

In accordance with the ordering requirements of the buyer, the casting can be

subjected to penetration, magnetic particle, ultrasonic or radiographic testing.

The required testing methods, location and acceptance criteria shall be agreed

upon between the supplier and the buyer.

......

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 14 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 223.9

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