Standard No.:	GB/T 9437-2026
English Name:	Heat resistant iron castings
Chinese Name:	耐热铸铁件
Professional Classification:	GB    National Standard
Source Content Issued by:	SAMR, SAC
Issued on:	2026-04-30
Implemented on:	2026-11-1
Status:	to be valid
Superseding:	GB/T 9437-2009 Heat resistant iron castings
Target Language:	English
File Format:	PDF
Word Count:	12500 words
Translation Price(USD):	375.0
Delivery:	via email in 1~5 business day

GB/T 9437-2026 Heat resistant 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 9437-2026 Heat resistant iron castings 耐热铸铁件 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, Quality Certificate, Rust Prevention, Packaging and Storage Annex A (Informative) ShortTime HighTemperature Tensile Strength of HeatResistant Iron Castings Annex B (Informative) Service Conditions and Application Examples of HeatResistant Iron Castings Annex C (Informative) Oxidation Resistance Test Method for HeatResistant Iron Castings Annex D (Informative) Growth Resistance Test Method for HeatResistant Iron Castings Bibliography Heatresistant iron castings 1 Scope This document specifies the grade designation, manufacturing method, technical requirements, inspection rules, marking, quality certificate, rust prevention, packaging and storage for heatresistant iron castings, and describes the corresponding test methods. This document applies to the manufacture of heatresistant iron castings poured in sand moulds or moulds with thermal conductivity equivalent to sand, intended for service at temperatures below 1100 °C. Heatresistant iron castings produced by pouring in other moulds may refer to this document. 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 223.4 Iron, steel and alloy — Determination of manganese content — Potentiometric or visual titration method GB/T 223.8 Iron, steel and alloy — Determination of aluminium content — Titration and spectrophotometric method 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 separationdiphenylcarbazide photometric method for the determination of chromium 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 αbenzoinoxime gravimetric method for the determination of molybdenum content GB/T 223.58 Methods for chemical analysis of iron, steel and alloy — The sodium arsenitesodium 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 223.61 Methods for chemical analysis of iron, steel and alloy — The ammonium phosphomolybdate volumetric method for the determination of phosphorus content 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 223.72 Iron, steel and alloy — Determination of sulfur content — Gravimetric method GB/T 223.83 Iron, steel and alloy — Determination of high sulfur content — Infrared absorption method after combustion in an induction furnace GB/T 223.86 Iron, steel and alloy — Determination of total carbon content — Infrared absorption method after combustion in an induction furnace GB/T 228.1 Metallic materials — Tensile testing — Part 1: Method of test at room temperature GB/T 231.1 Metallic materials — Brinell hardness test — Part 1: Test method GB/T 1348 Spheroidal graphite iron castings 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 7216 Metallographic test for grey cast iron GB/T 7233.1 Ultrasonic testing of steel castings — Part 1: Steel castings for general purposes GB/T 9439 Grey iron castings GB/T 9441 Metallographic test for spheroidal graphite cast iron 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 13298 Inspection method of microstructure for metals GB/T 14203 General rules for spark discharge atomic emission spectrometry GB/T 15056 Casting surface roughness — Appraisal method GB/T 20066 Steel and iron — Sampling and preparation of samples for the determination of chemical composition GB/T 24234 Cast iron — Determination of multielement contents — Spark discharge atomic emission spectrometric method (routine method) GB/T 26655 Compacted graphite iron castings GB/T 26656 Metallographic test for compacted graphite iron GB/T 31213.1 Nondestructive testing — Testing of cast iron components — Part 1: Ultrasonic testing method GB/T 34904 Spheroidal graphite iron castings — Ultrasonic testing GB/T 38441 Pig iron and cast iron — Determination of chromium, copper, magnesium, manganese, molybdenum, nickel, phosphorus, tin, titanium, vanadium and silicon — Inductively coupled plasma atomic emission spectrometric 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 3 Terms and Definitions The terms and definitions given in GB/T 5611 apply to this document. 4 Grade Designation 4.1 Heatresistant iron casting code The code for heatresistant iron castings shall be designated according to GB/T 5612. HTR denotes heatresistant grey iron castings, BTR denotes heatresistant white iron castings, RuTR denotes heatresistant compacted graphite iron castings, and QTR denotes heatresistant spheroidal graphite iron castings. 4.2 Grade designation method for heatresistant iron castings The grade designation method for heatresistant iron castings shall comply with the provisions of GB/T 5612. The grade designation consists of the heatresistant iron casting code, the alloying element symbol, and the nominal alloying element content, as shown below. Example: QTRSi4Mo1 indicates a heatresistant spheroidal graphite iron casting with a nominal silicon content of 4 % and a nominal molybdenum content of 1 %. 4.3 Heatresistant iron casting grades Based on the microstructure and chemical composition of the heatresistant iron castings, they are divided into 12 grades, as specified in Table 1. 5 Manufacturing Method 5.1 Unless otherwise specified, the melting method and casting process for heatresistant iron castings shall be determined by the supplier. 5.2 Unless otherwise specified, castings may be supplied in the ascast condition. 5.3 If the tensile strength of the ascast castings does not meet the specified requirements, the supplier may heattreat the castings. 6 Technical Requirements 6.1 Chemical composition The chemical composition of heatresistant iron castings shall comply with the provisions of Table 1. 6.2 Mechanical properties 6.2.1 The roomtemperature tensile strength of separately cast test samples for heatresistant iron castings shall comply with the provisions of Table 2. Shorttime hightemperature tensile properties are given in Annex A. 6.2.2 The tensile strength and sampling location for test specimens taken from the casting body of heatresistant iron castings shall be agreed upon between the supplier and the purchaser. 6.2.3 The hardness requirements for heatresistant iron castings shall be agreed upon between the supplier and the purchaser. Table 2 lists reference hardness values for heatresistant iron castings. 6.2.4 The characteristics, service conditions and typical application examples of heatresistant iron castings are given in Annex B. 6.3 Microstructure The microstructure of heatresistant iron castings shall be agreed upon between the supplier and the purchaser. 6.4 Geometry and dimensions 6.4.1 The geometry and dimensional tolerances of the castings shall comply with the provisions of the drawings or the order contract. 6.4.2 If not specified in the drawings and the order contract, the appropriate tolerance class for the geometry and dimensions of the castings shall be selected according to the provisions of GB/T 42124.3. 6.5 Mass 6.5.1 The mass tolerance of the castings shall comply with the provisions of the drawings or the order contract. 6.5.2 If not specified in the drawings and the order contract, the appropriate mass tolerance class for the castings shall be selected according to the provisions of GB/T 11351. 6.6 Surface quality 6.6.1 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. 6.6.2 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. 6.6.3 The surface of the castings shall not have cracks, cold shuts or slag inclusion defects. 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. 6.6.4 The morphology, quantity, dimensions and location of permissible defects on the castings, as well as repair methods, shall be agreed upon between the supplier and the purchaser. 6.7 Internal quality 6.7.1 The interior of the castings shall not have cracks. The type, extent, quantity and size of permissible internal defects in the castings shall be agreed upon between the supplier and the purchaser.