GB/T 8491-2026 Corrosion resistant high silicon 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 8491-2026
Corrosion resistant high silicon iron castings
高硅耐蚀铸铁件
Issue date: 2026-03-31 Implementation date: 2026-10-01
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 Grade Designation
5 Manufacturing Method
6 Technical Requirements
7 Test Methods
8 Inspection Rules
9 Marking, Certificate, Packaging, Transport and Storage
Annex A (Informative) Application Conditions and Examples of High silicon Corrosion resistant Iron Castings
Annex B (Informative) Heat Treatment Processes for High silicon Corrosion resistant Iron Castings
High silicon corrosion resistant iron castings
1 Scope
This document specifies the grade designation, manufacturing method, technical requirements, inspection rules, marking, certificate, packaging, transport and storage for high silicon corrosion resistant iron castings, and describes the corresponding test methods.
This document applies to the manufacture of high silicon corrosion resistant iron castings with a silicon content of 10.00 % to 18.00 %.
2 Normative References
The following documents are essential for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any 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 223.11 Iron, steel and alloy — Determination of chromium content — Titration and spectrophotometric method
GB/T 223.12 Methods for chemical analysis of iron, steel and alloy — The sodium carbonate separation diphenylcarbazide photometric method for the determination of chromium content
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 223.19 Methods for chemical analysis of iron, steel and alloy — The neocuproine chloroform extraction photometric method for the determination of copper content
GB/T 223.26 Iron, steel and alloy — Determination of molybdenum content — Thiocyanate spectrophotometric method
GB/T 223.28 Methods for chemical analysis of iron, steel and alloy — The α benzoinoxime gravimetric method for the determination of molybdenum 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 223.59 Iron, steel and alloy — Determination of phosphorus content — Bismuth phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate blue spectrophotometric method
GB/T 223.60 Iron, steel and alloy — Determination of silicon content — Gravimetric method
GB/T 223.64 Iron, steel and alloy — Determination of manganese content — Flame atomic absorption spectrometric method
GB/T 223.68 Methods for chemical analysis of iron, steel and alloy — The potassium iodate titration method after combustion in a tube furnace for the determination of sulfur content
GB/T 223.69 Iron, steel and alloy — Determination of carbon content — Gas volumetric method after combustion in a tube furnace
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 Method of sampling for spectrographic analysis of cast alloys
GB/T 6060.1 Surface roughness comparison specimens — Part 1: Cast surfaces
GB/T 9443 Steel and iron castings — Liquid penetrant inspection
GB/T 9444 Steel and iron castings — Magnetic particle inspection
GB/T 11351 Mass tolerance of casting
GB/T 13927 Industrial valves — Pressure testing
GB/T 14203 General rules for spark discharge atomic emission spectrometry
GB/T 15056 Casting surface roughness — Appraisal method
GB/T 16545 Corrosion of metals and alloys — Removal of corrosion products from corrosion test specimens
GB/T 19291 Corrosion of metals and alloys — General principles for corrosion testing
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 24234 Cast iron — Determination of multi element contents — Spark discharge atomic emission spectrometric method (routine method)
GB/T 42124.3 Geometrical product specifications (GPS) — Dimensional and geometrical tolerances for moulded parts — Part 3: Castings — Dimensional tolerances, geometrical tolerances and machining allowances
JB/T 7945.2 Test methods for mechanical properties of grey cast iron — Part 2: Bending test
3 Terms and Definitions
The terms and definitions given in GB/T 5611 apply to this document.
4 Grade Designation
The grade designation method for high silicon corrosion resistant iron and its castings shall comply with GB/T 5612. There are 9 grades, as shown in Table 1. The application conditions and application examples of high silicon corrosion resistant iron are given in Annex A.
5 Manufacturing Method
5.1 Unless otherwise specified, the melting method and casting process shall be determined by the supplier.
5.2 High silicon iron castings may be supplied in the as cast condition. Castings with complex structures, large differences in wall thickness, or important components shall be stress relief annealed. The delivery condition shall be agreed upon between the supplier and the purchaser.
5.3 The heat treatment method for castings is given in Annex B.
6 Technical Requirements
6.1 Chemical composition
The grade designations of high silicon corrosion resistant iron castings and their corresponding chemical compositions shall comply with the provisions of Table 1.
6.2 Mechanical properties
6.2.1 The mechanical properties of high silicon corrosion resistant iron castings are generally not used as acceptance criteria. If required by the purchaser, bending tests shall be performed on test bars at a frequency and quantity agreed upon by the supplier and the purchaser to determine their flexural strength and deflection. The test results shall comply with the provisions of Table 2.
6.2.2 The hardness requirements for high silicon corrosion resistant iron castings shall be agreed upon between the supplier and the purchaser. Table 2 lists reference hardness values for heat resistant cast iron.
6.3 Geometry and dimensions
The geometry and dimensions of the castings shall comply with the provisions of the purchaser‘s drawings or the order contract. Unless otherwise specified, the appropriate tolerance class for the geometry and dimensions of the castings shall be selected according to the provisions of GB/T 42124.3.
NOTE: High silicon corrosion resistant iron is a relatively brittle metallic material. Its casting structural design should avoid sharp corners and abrupt cross sectional transitions.
6.4 Mass
The mass tolerance of the castings shall comply with the provisions of the drawings or the order contract. Unless otherwise specified, the appropriate mass tolerance class for the castings shall be selected according to the provisions of GB/T 11351.
6.5 Surface quality
6.5.1 The surface roughness of the castings shall comply with the provisions of the drawings or the order contract. If not specified in the drawings or the order contract, the surface roughness of the castings shall comply with the corresponding values specified in GB/T 6060.1.
6.5.2 Castings shall be cleaned and excess material trimmed. The permissible residual gates and risers, fins, burrs, and internal cavity cleanliness of the castings shall comply with the provisions of the drawings or the order contract.
6.5.3 Castings shall not have cracks or casting defects that reduce strength, affect corrosion resistance, or impair product appearance. If the purchaser requires magnetic particle inspection and liquid penetrant inspection of the castings, the supplier shall perform the inspections as required and meet the corresponding technical requirements.
6.5.4 The morphology, quantity, dimensions and location of permissible casting defects on the surface of the castings, as well as repair methods, shall be agreed upon between the supplier and the purchaser.
Standard
GB/T 8491-2026 Corrosion resistant high silicon iron castings (English Version)
GB/T 8491-2026 Corrosion resistant high silicon 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 8491-2026
Corrosion resistant high silicon iron castings
高硅耐蚀铸铁件
Issue date: 2026-03-31 Implementation date: 2026-10-01
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 Grade Designation
5 Manufacturing Method
6 Technical Requirements
7 Test Methods
8 Inspection Rules
9 Marking, Certificate, Packaging, Transport and Storage
Annex A (Informative) Application Conditions and Examples of High silicon Corrosion resistant Iron Castings
Annex B (Informative) Heat Treatment Processes for High silicon Corrosion resistant Iron Castings
High silicon corrosion resistant iron castings
1 Scope
This document specifies the grade designation, manufacturing method, technical requirements, inspection rules, marking, certificate, packaging, transport and storage for high silicon corrosion resistant iron castings, and describes the corresponding test methods.
This document applies to the manufacture of high silicon corrosion resistant iron castings with a silicon content of 10.00 % to 18.00 %.
2 Normative References
The following documents are essential for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any 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 223.11 Iron, steel and alloy — Determination of chromium content — Titration and spectrophotometric method
GB/T 223.12 Methods for chemical analysis of iron, steel and alloy — The sodium carbonate separation diphenylcarbazide photometric method for the determination of chromium content
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 223.19 Methods for chemical analysis of iron, steel and alloy — The neocuproine chloroform extraction photometric method for the determination of copper content
GB/T 223.26 Iron, steel and alloy — Determination of molybdenum content — Thiocyanate spectrophotometric method
GB/T 223.28 Methods for chemical analysis of iron, steel and alloy — The α benzoinoxime gravimetric method for the determination of molybdenum 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 223.59 Iron, steel and alloy — Determination of phosphorus content — Bismuth phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate blue spectrophotometric method
GB/T 223.60 Iron, steel and alloy — Determination of silicon content — Gravimetric method
GB/T 223.64 Iron, steel and alloy — Determination of manganese content — Flame atomic absorption spectrometric method
GB/T 223.68 Methods for chemical analysis of iron, steel and alloy — The potassium iodate titration method after combustion in a tube furnace for the determination of sulfur content
GB/T 223.69 Iron, steel and alloy — Determination of carbon content — Gas volumetric method after combustion in a tube furnace
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 Method of sampling for spectrographic analysis of cast alloys
GB/T 6060.1 Surface roughness comparison specimens — Part 1: Cast surfaces
GB/T 9443 Steel and iron castings — Liquid penetrant inspection
GB/T 9444 Steel and iron castings — Magnetic particle inspection
GB/T 11351 Mass tolerance of casting
GB/T 13927 Industrial valves — Pressure testing
GB/T 14203 General rules for spark discharge atomic emission spectrometry
GB/T 15056 Casting surface roughness — Appraisal method
GB/T 16545 Corrosion of metals and alloys — Removal of corrosion products from corrosion test specimens
GB/T 19291 Corrosion of metals and alloys — General principles for corrosion testing
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 24234 Cast iron — Determination of multi element contents — Spark discharge atomic emission spectrometric method (routine method)
GB/T 42124.3 Geometrical product specifications (GPS) — Dimensional and geometrical tolerances for moulded parts — Part 3: Castings — Dimensional tolerances, geometrical tolerances and machining allowances
JB/T 7945.2 Test methods for mechanical properties of grey cast iron — Part 2: Bending test
3 Terms and Definitions
The terms and definitions given in GB/T 5611 apply to this document.
4 Grade Designation
The grade designation method for high silicon corrosion resistant iron and its castings shall comply with GB/T 5612. There are 9 grades, as shown in Table 1. The application conditions and application examples of high silicon corrosion resistant iron are given in Annex A.
5 Manufacturing Method
5.1 Unless otherwise specified, the melting method and casting process shall be determined by the supplier.
5.2 High silicon iron castings may be supplied in the as cast condition. Castings with complex structures, large differences in wall thickness, or important components shall be stress relief annealed. The delivery condition shall be agreed upon between the supplier and the purchaser.
5.3 The heat treatment method for castings is given in Annex B.
6 Technical Requirements
6.1 Chemical composition
The grade designations of high silicon corrosion resistant iron castings and their corresponding chemical compositions shall comply with the provisions of Table 1.
6.2 Mechanical properties
6.2.1 The mechanical properties of high silicon corrosion resistant iron castings are generally not used as acceptance criteria. If required by the purchaser, bending tests shall be performed on test bars at a frequency and quantity agreed upon by the supplier and the purchaser to determine their flexural strength and deflection. The test results shall comply with the provisions of Table 2.
6.2.2 The hardness requirements for high silicon corrosion resistant iron castings shall be agreed upon between the supplier and the purchaser. Table 2 lists reference hardness values for heat resistant cast iron.
6.3 Geometry and dimensions
The geometry and dimensions of the castings shall comply with the provisions of the purchaser‘s drawings or the order contract. Unless otherwise specified, the appropriate tolerance class for the geometry and dimensions of the castings shall be selected according to the provisions of GB/T 42124.3.
NOTE: High silicon corrosion resistant iron is a relatively brittle metallic material. Its casting structural design should avoid sharp corners and abrupt cross sectional transitions.
6.4 Mass
The mass tolerance of the castings shall comply with the provisions of the drawings or the order contract. Unless otherwise specified, the appropriate mass tolerance class for the castings shall be selected according to the provisions of GB/T 11351.
6.5 Surface quality
6.5.1 The surface roughness of the castings shall comply with the provisions of the drawings or the order contract. If not specified in the drawings or the order contract, the surface roughness of the castings shall comply with the corresponding values specified in GB/T 6060.1.
6.5.2 Castings shall be cleaned and excess material trimmed. The permissible residual gates and risers, fins, burrs, and internal cavity cleanliness of the castings shall comply with the provisions of the drawings or the order contract.
6.5.3 Castings shall not have cracks or casting defects that reduce strength, affect corrosion resistance, or impair product appearance. If the purchaser requires magnetic particle inspection and liquid penetrant inspection of the castings, the supplier shall perform the inspections as required and meet the corresponding technical requirements.
6.5.4 The morphology, quantity, dimensions and location of permissible casting defects on the surface of the castings, as well as repair methods, shall be agreed upon between the supplier and the purchaser.
