GB/T 1299-2025 Tool and mould steels English, Anglais, Englisch, Inglés, えいご
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ICS 13.220
CCS H 57
National Standard of the People's Republic of China
GB/T 1299-2025
Replaces GB/T 1299-2014
Tool and mould steels
工模具钢
Issue date: 2025-10-31 Implementation date: 2026-05-01
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 Classification and designations
5 Order content
6 Manufacturing processes
6.1 Melting method
6.2 Delivery condition
7 Technical requirements
7.1 Grade and chemical composition
7.2 Delivery hardness
7.3 Macrostructure
7.4 Microstructure
7.5 Non-metallic inclusions
7.6 Decarburized layer
7.7 Relative permeability
7.8 Ultrasonic testing
7.9 Surface quality
7.10 Dimensions, shape, and weight
7.11 Special requirements
8 Test methods
9 Inspection rules
9.1 Inspection and acceptance
9.2 Batch rules
9.3 Number and location of samples
9.4 Re-inspection and judgment rules
10 Packaging, marking, and quality certificate
Appendix A (Informative) Comparison of grades in this document with foreign grades
Appendix B (Informative) Main characteristics and uses of each grade
Appendix C (Normative) Sampling for hardness test after quenching or quenching and tempering
Appendix D (Normative) Standard reference charts for steel bars
Appendix E (Normative) Etching and evaluation method for low-magnification structure of remelted steel bars and billets
Appendix F (Normative) Test method for hardenability of non-alloy tool steel bars
References
1 Scope
This document specifies the classification and designations, order content, manufacturing processes, technical requirements, test methods, inspection rules, packaging, marking, and quality certificates for tool and die steels.
This document applies to hot-rolled, forged, cold-drawn, polished, and machined steel bars and hot-rolled wire rods (hereinafter collectively referred to as steel bars), as well as cold-rolled single-plate steel sheets with a nominal thickness not exceeding 4 mm and hot-rolled single-plate steel sheets with a nominal thickness not exceeding 10 mm (hereinafter referred to as steel sheets). The chemical composition requirements also apply to steel ingots, steel billets, and their products.
Note: In this document, steel bars and steel sheets are collectively referred to as steel products.
2 Normative references
The contents of the following documents referenced in this document constitute indispensable clauses. For dated references, only the version cited applies. For undated references, the latest version (including all amendments) applies.
GB/T 222 - Steel and alloys - Permissible tolerances on chemical composition of products
GB/T 223 (all parts) - Methods for chemical analysis of iron and steel
GB/T 224 - Method for determination of decarburized layer depth on steel
GB/T 225 - Steel - End-quench test method for hardenability (Jominy test)
GB/T 226 - Steel - Acid-etch inspection method for macrostructure and defects
GB/T 230.1 - Metallic materials - Rockwell hardness test - Part 1: Test method
GB/T 231.1 - Metallic materials - Brinell hardness test - Part 1: Test method
GB/T 247 - General requirements for packaging, marking, and quality certificates of steel plates and steel strips
GB/T 702-2017 - Hot-rolled steel bars - Dimensions, shape, weight, and permissible deviations
GB/T 708-2019 - Cold-rolled steel plates and steel strips - Dimensions, shape, weight, and permissible deviations
GB/T 709-2019 - Hot-rolled steel plates and steel strips - Dimensions, shape, weight, and permissible deviations
GB/T 905-1994 - Cold-drawn round steel, square steel, and hexagonal steel - Dimensions, shape, weight, and permissible deviations
GB/T 908-2019 - Forged steel bars - Dimensions, shape, weight, and permissible deviations
GB/T 1172 - Conversion values for hardness and strength of ferrous metals
GB/T 1979 - Assessment of low-magnification structure defects in structural steels - Acid-etching method and ultrasonic testing method
GB/T 2101 - General rules for acceptance, packaging, marking, and quality certificates of section steel
GB/T 3207-2025 - Polished steel
GB/T 4336 - Carbon and low-alloy steels - Determination of multi-element content - Spark discharge atomic emission spectrometry (routine method)
GB/T 4340.1 - Metallic materials - Vickers hardness test - Part 1: Test method
GB/T 6394 - Method for evaluation of average grain size of metallic materials
GB/T 8651 - Ultrasonic plate wave testing method for metallic plates
GB/T 10561-2023 - Steel - Determination of non-metallic inclusion content - Standard chart rating method for microscopic examination
GB/T 11170 - Stainless steel - Determination of multi-element content - Spark discharge atomic emission spectrometry (routine method)
GB/T 11261 - Iron and steel - Determination of oxygen content - Pulsed heating inert gas fusion with infrared absorption
GB/T 13298 - Metallic materials - Microstructure examination methods
GB/T 14979-1994 - Assessment method for eutectic carbide inhomogeneity in steels
GB/T 14981-2009 - Hot-rolled steel wire rods - Dimensions, shape, weight, and permissible deviations
GB/T 17505 - Steel and steel products - General technical requirements for delivery
GB/T 20066 - Steel and iron - Sampling and sample preparation for determination of chemical composition
GB/T 20123 - Iron and steel - Determination of total carbon and sulfur content - High-frequency induction furnace combustion with infrared absorption (routine method)
GB/T 20124 - Iron and steel - Determination of nitrogen content - Inert gas fusion with thermal conductivity detection (routine method)
GB/T 20566 - Terminology for steel and alloys
GB/T 35690 - Measurement method for relative permeability of weakly magnetic materials
YB/T 6019 - Ultrasonic testing method for die steels
YB/T 6240-2024 - Assessment of carbides in hypereutectoid steels - Standard chart rating method
3 Terms and definitions
The terms and definitions defined in GB/T 20566 and the following apply to this document.
3.1
Tool and die steels - steels used for manufacturing tools and molds, which are processed into components or products for specific applications through cutting, forming, or other processes from raw materials (steel, non-ferrous metals, plastics, etc.), characterized by high hardness, wear resistance, and sufficient toughness and strength.
3.2
Non-alloyed steels for tools and molds - steels for tools and molds with carbon content typically within 0.40% to 1.50% and containing trace amounts of silicon, manganese, and other elements.
Note: Also known as carbon steels for tools and molds.
3.3
Steels for measuring tools and cutting tools - steels collectively used for manufacturing measuring tools (calipers, gauge blocks, plug gauges, micrometers, etc.) and ordinary cutting tools (lathe tools, milling cutters, planers, drills, taps, dies, etc.), characterized by high hardness, wear resistance, dimensional stability, and certain toughness.
3.4
Shock-resisting tool steels - steels collectively used for manufacturing tools and molds that operate under high-impact loads, frequent vibrations, and dynamic stress environments, characterized by high hardness, excellent impact toughness, and fatigue resistance.
3.5
Steels for cold-rolled forging steel rolls - steels collectively used for manufacturing cold-rolled steel sheet and strip mill rolls through forging processes, characterized by high surface hardness, certain hardening depth, excellent wear resistance, fatigue resistance, and core toughness.
3.6
Cold-work mold steels - steels collectively used for manufacturing molds that perform cold forming (≤200℃) operations such as punching, stretching, cold heading, extrusion, embossing, and rolling on workpieces, characterized by high hardness, wear resistance, resistance to plastic deformation, and moderate toughness.
3.7
Hot-work mold steels - steels collectively used for manufacturing molds that perform hot forming (>200℃) operations such as forging, die casting, extrusion, and shearing on metal workpieces, characterized by high thermal strength, thermal fatigue resistance, heat wear resistance, high hardenability, and excellent resistance to tempering softening.
3.8
Plastic mold steels - steels collectively used for manufacturing plastic molding molds (such as injection molds, blow molds, extrusion molds, etc.), characterized by certain strength, hardness, wear resistance, corrosion resistance, and heat resistance, as well as good processability.
4 Classification and designations
4.1 Steel products are classified into the following two categories based on chemical composition and application:
a) Non-alloyed steels for tools and molds:
