JB/T 7248-2024 Technical specification for low temperature service steel casting for valves
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.
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.
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
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
JB/T 7248-2024 Technical specification for low temperature service steel casting for valves
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.
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.
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
Contents of JB/T 7248-2024
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
