GB/T 26648-2026 Austenitic iron castings English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS
CCS
National Standard of the People's Republic of China
GB/T 26648-2026
Austenitic iron castings
奥氏体铸铁件
Issue date: 2026-02-27 Implementation date: 2026-09-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Designation
5 Technical Requirements
6 Test Methods
7 Inspection Rules
8 Marking, Certificate of Conformity, Packaging, Transport and Storage
Annex A (Informative) Supplementary information on mechanical and physical properties of austenitic cast irons
Annex B (Informative) Characteristics and main applications of austenitic cast irons
Annex C (Informative) Recommended heat treatment processes
Austenitic iron castings
1 Scope
This document specifies the designation and technical requirements for austenitic iron castings, describes the corresponding test methods, and specifies the inspection rules as well as requirements for marking, certificate of conformity, packaging, storage and transport.
This document applies to the manufacture of austenitic iron castings.
2 Normative references
The contents of the following documents constitute essential provisions of this document through normative reference. For dated references, only the edition cited applies. For undated references, the latest edition (including all amendments) applies.
GB/T 223.3 Methods for chemical analysis of iron, steel and alloy — The diantipyrylmethane phosphomolybdate gravimetric method for the determination of phosphorus content
GB/T 223.4 Iron, steel and alloy — Determination of manganese content — Potentiometric or visual titration method
GB/T 223.11 Iron, steel and alloy — Determination of chromium content — Titration method and spectrophotometric method
GB/T 223.18 Methods for chemical analysis of iron, steel and alloy — The sodium thiosulfate separation iodometric method for the determination of copper content
GB/T 223.25 Methods for chemical analysis of iron, steel and alloy — The dimethylglyoxime gravimetric method for the determination of nickel content
GB/T 223.58 Methods for chemical analysis of iron, steel and alloy — The sodium arsenite sodium nitrite titrimetric method for the determination of manganese content
GB/T 223.60 Iron, steel and alloy — Determination of silicon content — Gravimetric method
GB/T 223.68 Methods for chemical analysis of iron, steel and alloy — The potassium iodate titrimetric method after combustion in a tube furnace for the determination of sulfur content
GB/T 223.71 Methods for chemical analysis of iron, steel and alloy — The gravimetric method after combustion in a tube furnace for the determination of carbon content
GB/T 228.1 Metallic materials — Tensile testing — Part 1: Method of test at room temperature
GB/T 229-2020 Metallic materials — Charpy pendulum impact test method
GB/T 231.1 Metallic materials — Brinell hardness test — Part 1: Test method
GB/T 5611 Foundry terminology
GB/T 5612 Code for representing cast iron grades
GB/T 5677 Castings — Radiographic testing
GB/T 5678 Sampling methods for spectrochemical analysis of casting alloys
GB/T 6060.1-2018 Surface roughness comparison specimens — Part 1: Cast surfaces
GB/T 7216 Metallographic test for grey cast iron
GB/T 9441 Metallographic test for spheroidal graphite cast iron
GB/T 9443 Steel and iron castings — Penetrant testing
GB/T 9444 Steel and iron castings — Magnetic particle testing
GB/T 11351-2017 Mass tolerances for castings
GB/T 14203 General rules for spark discharge atomic emission spectrometry
GB/T 15056 Evaluation method of surface roughness for castings
GB/T 20066 Steel and iron — Sampling and preparation of samples for the determination of chemical composition
GB/T 34904 Spheroidal graphite iron castings — Ultrasonic testing
GB/T 42124.3-2025 Geometrical product specifications (GPS) — Dimensional and geometrical tolerances for moulded parts — Part 3: Dimensional tolerances, geometrical tolerances and machining allowances
JB/T 9219 Spheroidal graphite cast iron — Method for measuring ultrasonic velocity
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 5611 and the following apply.
3.1 austenitic cast irons
Cast irons that are mainly composed of iron, carbon and nickel, with the addition of elements such as silicon, manganese, copper and chromium through melting, and which have a stable predominantly austenitic matrix at room temperature.
4 Designation
The designations for austenitic cast irons shall comply with GB/T 5612 and are divided into 12 designations, as shown in Table 1 and Table 2. Information on the mechanical and physical properties of austenitic cast irons is given in Annex A.
5 Technical requirements
5.1 Chemical composition
The chemical composition of castings shall comply with the provisions of Table 1 and Table 2. When special requirements for chemical composition arise for castings of special purpose designations (see Annex B), they shall be agreed upon between the supplier and the purchaser.
5.2 Mechanical properties
5.2.1 The mechanical properties of the casting material at room temperature shall comply with the provisions of Table 3 and Table 4.
5.2.2 The acceptance items for the mechanical properties of castings shall be agreed upon between the supplier and the purchaser. In general:
a) For austenitic grey cast irons and QTANi30Si5Cr5, tensile strength shall be used as the acceptance criterion;
b) For austenitic spheroidal graphite cast irons, tensile strength and elongation shall be used as the acceptance criteria.
5.2.3 When yield strength, impact toughness or hardness is required, they may be used as acceptance criteria upon agreement between the supplier and the purchaser.
5.2.4 When mechanical properties are determined by sampling from the casting body, the sampling location, size, quantity and the performance indicators to be achieved shall be agreed upon between the supplier and the purchaser.
5.3 Metallographic structure
5.3.1 The metallographic structure of castings shall meet the following requirements:
a) Metallographic structure of austenitic grey cast iron: austenite + a small amount of grain boundary carbides + flake graphite. Type A graphite ≥ 70%, graphite length grades 3 to 5.
b) Metallographic structure of austenitic spheroidal graphite cast iron: austenite + spheroidal graphite. Spheroidization grade not lower than Grade 3, graphite size grades 5 to
8. A small amount of carbides is permitted, the specific content to be agreed upon between the supplier and the purchaser.
5.3.2 The presence of lumpy carbides is not permitted. Heat treatment methods may be used to alter the morphology of carbides.
5.3.3 Castings shall generally be supplied in the as cast condition. When required by the purchaser, they shall be treated according to the specified heat treatment process. Recommended heat treatment processes are given in Annex C.
5.4 Geometric shape and dimensional tolerances
The geometric shape and dimensions of castings shall comply with the requirements of the drawing or the purchase contract. When no special requirements are specified, the dimensional tolerance grade of castings shall reach Grade DCTG10 in GB/T 42124.3-2025, and the geometrical tolerance grade shall comply with Grade GCTG6 in GB/T 42124.3-2025.
5.5 Mass tolerances
The mass tolerances of castings shall comply with the requirements of the drawing or the purchase contract. When no special requirements are specified, the mass tolerance grade of
Standard
GB/T 26648-2026 Austenitic iron castings (English Version)
GB/T 26648-2026 Austenitic iron castings English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS
CCS
National Standard of the People's Republic of China
GB/T 26648-2026
Austenitic iron castings
奥氏体铸铁件
Issue date: 2026-02-27 Implementation date: 2026-09-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Designation
5 Technical Requirements
6 Test Methods
7 Inspection Rules
8 Marking, Certificate of Conformity, Packaging, Transport and Storage
Annex A (Informative) Supplementary information on mechanical and physical properties of austenitic cast irons
Annex B (Informative) Characteristics and main applications of austenitic cast irons
Annex C (Informative) Recommended heat treatment processes
Austenitic iron castings
1 Scope
This document specifies the designation and technical requirements for austenitic iron castings, describes the corresponding test methods, and specifies the inspection rules as well as requirements for marking, certificate of conformity, packaging, storage and transport.
This document applies to the manufacture of austenitic iron castings.
2 Normative references
The contents of the following documents constitute essential provisions of this document through normative reference. For dated references, only the edition cited applies. For undated references, the latest edition (including all amendments) applies.
GB/T 223.3 Methods for chemical analysis of iron, steel and alloy — The diantipyrylmethane phosphomolybdate gravimetric method for the determination of phosphorus content
GB/T 223.4 Iron, steel and alloy — Determination of manganese content — Potentiometric or visual titration method
GB/T 223.11 Iron, steel and alloy — Determination of chromium content — Titration method and spectrophotometric method
GB/T 223.18 Methods for chemical analysis of iron, steel and alloy — The sodium thiosulfate separation iodometric method for the determination of copper content
GB/T 223.25 Methods for chemical analysis of iron, steel and alloy — The dimethylglyoxime gravimetric method for the determination of nickel content
GB/T 223.58 Methods for chemical analysis of iron, steel and alloy — The sodium arsenite sodium nitrite titrimetric method for the determination of manganese content
GB/T 223.60 Iron, steel and alloy — Determination of silicon content — Gravimetric method
GB/T 223.68 Methods for chemical analysis of iron, steel and alloy — The potassium iodate titrimetric method after combustion in a tube furnace for the determination of sulfur content
GB/T 223.71 Methods for chemical analysis of iron, steel and alloy — The gravimetric method after combustion in a tube furnace for the determination of carbon content
GB/T 228.1 Metallic materials — Tensile testing — Part 1: Method of test at room temperature
GB/T 229-2020 Metallic materials — Charpy pendulum impact test method
GB/T 231.1 Metallic materials — Brinell hardness test — Part 1: Test method
GB/T 5611 Foundry terminology
GB/T 5612 Code for representing cast iron grades
GB/T 5677 Castings — Radiographic testing
GB/T 5678 Sampling methods for spectrochemical analysis of casting alloys
GB/T 6060.1-2018 Surface roughness comparison specimens — Part 1: Cast surfaces
GB/T 7216 Metallographic test for grey cast iron
GB/T 9441 Metallographic test for spheroidal graphite cast iron
GB/T 9443 Steel and iron castings — Penetrant testing
GB/T 9444 Steel and iron castings — Magnetic particle testing
GB/T 11351-2017 Mass tolerances for castings
GB/T 14203 General rules for spark discharge atomic emission spectrometry
GB/T 15056 Evaluation method of surface roughness for castings
GB/T 20066 Steel and iron — Sampling and preparation of samples for the determination of chemical composition
GB/T 34904 Spheroidal graphite iron castings — Ultrasonic testing
GB/T 42124.3-2025 Geometrical product specifications (GPS) — Dimensional and geometrical tolerances for moulded parts — Part 3: Dimensional tolerances, geometrical tolerances and machining allowances
JB/T 9219 Spheroidal graphite cast iron — Method for measuring ultrasonic velocity
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 5611 and the following apply.
3.1 austenitic cast irons
Cast irons that are mainly composed of iron, carbon and nickel, with the addition of elements such as silicon, manganese, copper and chromium through melting, and which have a stable predominantly austenitic matrix at room temperature.
4 Designation
The designations for austenitic cast irons shall comply with GB/T 5612 and are divided into 12 designations, as shown in Table 1 and Table 2. Information on the mechanical and physical properties of austenitic cast irons is given in Annex A.
5 Technical requirements
5.1 Chemical composition
The chemical composition of castings shall comply with the provisions of Table 1 and Table 2. When special requirements for chemical composition arise for castings of special purpose designations (see Annex B), they shall be agreed upon between the supplier and the purchaser.
5.2 Mechanical properties
5.2.1 The mechanical properties of the casting material at room temperature shall comply with the provisions of Table 3 and Table 4.
5.2.2 The acceptance items for the mechanical properties of castings shall be agreed upon between the supplier and the purchaser. In general:
a) For austenitic grey cast irons and QTANi30Si5Cr5, tensile strength shall be used as the acceptance criterion;
b) For austenitic spheroidal graphite cast irons, tensile strength and elongation shall be used as the acceptance criteria.
5.2.3 When yield strength, impact toughness or hardness is required, they may be used as acceptance criteria upon agreement between the supplier and the purchaser.
5.2.4 When mechanical properties are determined by sampling from the casting body, the sampling location, size, quantity and the performance indicators to be achieved shall be agreed upon between the supplier and the purchaser.
5.3 Metallographic structure
5.3.1 The metallographic structure of castings shall meet the following requirements:
a) Metallographic structure of austenitic grey cast iron: austenite + a small amount of grain boundary carbides + flake graphite. Type A graphite ≥ 70%, graphite length grades 3 to 5.
b) Metallographic structure of austenitic spheroidal graphite cast iron: austenite + spheroidal graphite. Spheroidization grade not lower than Grade 3, graphite size grades 5 to
8. A small amount of carbides is permitted, the specific content to be agreed upon between the supplier and the purchaser.
5.3.2 The presence of lumpy carbides is not permitted. Heat treatment methods may be used to alter the morphology of carbides.
5.3.3 Castings shall generally be supplied in the as cast condition. When required by the purchaser, they shall be treated according to the specified heat treatment process. Recommended heat treatment processes are given in Annex C.
5.4 Geometric shape and dimensional tolerances
The geometric shape and dimensions of castings shall comply with the requirements of the drawing or the purchase contract. When no special requirements are specified, the dimensional tolerance grade of castings shall reach Grade DCTG10 in GB/T 42124.3-2025, and the geometrical tolerance grade shall comply with Grade GCTG6 in GB/T 42124.3-2025.
5.5 Mass tolerances
The mass tolerances of castings shall comply with the requirements of the drawing or the purchase contract. When no special requirements are specified, the mass tolerance grade of
