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JB/T 7248-2024Technical specification for low temperature service steel casting for valves (English PDF)

阀门用低温钢铸件技术规范

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Issued by

MIIT

Level / Type

Industry · Recommended

Issue date

April 10, 2024

Implementation date

October 1, 2024

Scope

JB/T 7248-2024 is the English-translated version of 阀门用低温钢铸件技术规范.

JB/T 7248-2024 is the Chinese standard "Technical specification for low temperature service steel casting for valves".

Its scope clause reads: This document specifies the technical requirements for low temperature service steel casting for valves, describes the corresponding test methods, specifies acceptance criteria, markings, quality certificates, packaging, and storage and transportation.

This document is applicable to the manufacturing of valve steel castings with temperatures ranging from -29°C to -196°C, and it can be used for reference for the manufacturing of valve steel castings with temperatures ranging from -196°C to -254°C. Its clauses include terms and definitions; technical requirements.

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Document preview — JB/T 7248-2024

National Standard of the People's Republic of China

Replacing: JB/T 7248-2008

Issued by: Ministry of Industry and Information Technology of the People's Republic of China

Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Technical requirements
4.1 General requirements
4.2 Minimum impact test temperature
4.3 Chemical composition
4.4 Smelting
4.5 Heat treatment
4.6 Mechanical properties
4.7 Welding repair
4.8 Cryogenic treatment
4.9 Dimensions and mass
4.10 Appearance inspection
5 Test methods
5.1 Chemical analysis
5.2 Mechanical performance test
5.3 Dimensional inspection
5.4 Appearance inspection
6 Acceptance criteria
6.1 Chemical composition
6.2 Mechanical properties
6.3 Retesting
6.4 Thermal re-treatment
7 Marking, quality certificates, packaging, storage and transportation
7.1 Marking
7.2 Quality certificate
7.3 Packaging, storage and transportation
Annex A (Normative) Supplementary testing, inspection methods, and acceptance criteria
Annex B (Informative) Information that the purchaser needs to provide when ordering the product
B.1 Information required for ordering
B.2 Supplementary information required for ordering
Annex C (Informative) Welding repair process conditions

1 Scope

This document specifies the technical requirements for low temperature service steel casting for valves, describes the corresponding test methods, specifies acceptance criteria, markings, quality certificates, packaging, and storage and transportation.

2 Normative references

The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

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

GB/T 223 (All parts) Iron steel and alloy

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 4334 Corrosion of metals and alloys - Test methods for intergranular corrosion of austenitic and ferritic-austenitic (duplex) stainless steels

GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method)

GB/T 5677 Radiographic testing for steel castings

GB/T 6414 Castings - Dimensional tolerances and geometrical tolerances and machining allowances

GB/T 9443-2019 Steel and iron castings - Liquid penetrant inspection

GB/T 9444-2019 Steel and iron castings - Magnetic particle inspection

GB/T 9445 Non-destructive testing - Qualification and certification of NDT personnel

GB/T 9452 Test method for qualified work zone of heat treatment furnace

GB/T 11170 Stainless steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method)

GB/T 11351 Mass tolerances of casting

GB/T 11352-2009 Carbon steel castings for general engineering purpose

GB/T 12224 General requirements for industrial steel valves

GB/T 15056 Casting surface roughness- Appraising method

GB/T 15169 Qualification test of welders - Fusion welding for steels

GB/T 16253 Steel castings for pressure purposes

GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition

GB/T 26480 Valve inspection and testing

GB/T 32541-2016 Quality control system for heat treatment

GB/T 38223 Determination of ferrite content in austenitic stainless steel castings

JB/T 6439-2008 Methods of magnetic examination for valves

JB/T 6440-2008 Methods of radiographic examination for steel castings valves

JB/T 6902-2008 Methods for liquid penetrant examination of valves

JB/T 7927-2014 Valve cast steel visual quality requirements

3 Terms and definitions

None.

4 Technical requirements

4.1 General requirements

4.1.1

The casting process method shall be agreed upon by both the supplier and the purchaser. The low-temperature steel castings (hereinafter referred to as "castings") used for the first production of valves, as well as their process and technical documents, shall be approved by the purchaser.

4.1.2

The purchaser may choose one or more requirements of the supplementary testing, inspection methods, and acceptance criteria for castings in Annex A as needed, and provide information in accordance with Annex B as part of the contract. The supplier shall implement and provide reports.

4.2 Minimum impact test temperature

The minimum impact test temperature for castings is shown in Table 1.

Table 1 Minimum impact test temperature […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Cited by

Similar standards

GB/T 18984-2026|NB/T 47019.4-2021|GB/T 37577-2019|GB/T 37602-2019|GB/T 18984-2016|GB/T 32238-2015

Editions of JB/T 7248

Edition	Title	Revision	Status
JB/T 7248-2024	Technical specification for low temperature service steel casting for valves	current edition	Current
JB/T 7248-2008	Technical specification for low temperature service steel casting for valves	previous edition	Superseded

This page sells the current edition, JB/T 7248-2024. Earlier editions are listed for reference only.

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