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Eternal
H13 hot work tool steel (AISI H13 / DIN 1.2344 / JIS SKD61 / GB 4Cr5MoSiV1) is the most widely used chromium-based hot work die steel in the global mold and die industry. It is specifically engineered for high-temperature forging, extrusion, and die casting applications where components are subjected to extreme thermal and mechanical stresses.
Jiangyin Eternal Heavy Industry Co., Ltd is the manufacturer of H13 forgings.Our H13 forging dies and extrusion dies are manufactured from premium-quality electro-slag remelted (ESR) steel, delivering superior cleanliness, improved toughness, and excellent isotropic properties. Whether you need hot forging dies for automotive components, extrusion dies for aluminum profiles, or die casting molds for non-ferrous metals, our H13 tool steel solutions provide the durability and performance you demand.
H13 forged steel resists softening at temperatures up to 550°C (1022°F) and maintains its mechanical properties in continuous hot work service. It withstands thermal cycling without significant loss of hardness or strength.
The unique combination of chromium, molybdenum, and vanadium provides outstanding resistance to thermal shock and heat checking – the primary failure modes in hot work tooling. This translates directly to longer die life and reduced downtime.
H13 forged steel offers an optimal balance of hardness and fracture toughness, even at elevated temperatures. The ESR refinement process enhances isotropic properties, ensuring consistent performance in all directions.
With high carbon and vanadium content, H13 forged steel provides excellent resistance to abrasive wear, extending tool life in high-volume production runs.
H13 forged steel can be machined, polished, and surface-treated (nitriding, chrome plating, PVD coating) to meet the most demanding surface finish requirements.
Our H13 tool steel complies with NADCA #207 specifications for Premium and Superior categories, as well as major automotive die tooling specifications.
The use of a high-purity slag system and precise control of the melting rate ensures the purity of the steel and the density of its microstructure.
Extrusion heating temperature: 1270 °C; forging ratio: ≥6.0; improved isotropy
The material was removed from the furnace twice, at 1050°C and 980°C, and quenched in water to 300–350°C, effectively suppressing the network-like precipitation of carbides.
Each batch is subjected to impact, hardness and microstructural testing in accordance with NADCA #207.
Property | Specification |
Standard Equivalents | AISI H13, DIN 1.2344, JIS SKD61, GB 4Cr5MoSiV1 |
Chemical Composition | C: 0.32-0.45%, Si: 0.80-1.20%, Mn: 0.20-0.50%, Cr: 4.75-5.50%, Mo: 1.10-1.75%, V: 0.80-1.20% |
Annealing Hardness | ≤ 230 HB |
Quenching Hardness | 51-55 HRC |
Tempering Hardness | 46-50 HRC |
Density | 7.8 g/cm³ |
Heat Treatment | Hardening: 1020-1080°C, oil or air quench; Tempering: 560-580°C (minimum two tempers recommended) |
Quality Assurance
Our H13 tool steel undergoes rigorous quality control throughout the manufacturing process:
Special Steel Melting – Precise chemistry control with low sulfur content for enhanced toughness
Electroslag Remelting (ESR) – Superior cleanliness, homogeneous microstructure, and fine dispersed carbides
Heavy Forging Reductions – Optimized heating, forging, and annealing processes for improved structural integrity
Complete Testing & Certification – Manufactured and quality-assured within ISO-certified facilitie
NADCA Compliance – Meets North American Die Casting Association #207 specifications
Application | Use | Characteristic |  |
Aluminum alloy extrusion die | Aluminum profile extrusion die, hollow profile die | High temperature + Frequent thermal cycling stress + Alternating stress | |
Aluminum alloy die casting mold | Automobile lightweighting components (structural parts for new energy vehicles) | High-pressure casting, high-takt production | |
Hot-forging die | Precision hot forging dies, precision forging dies | High impact load, high temperature environment | |
Hot extrusion tool | Compression perforating core rod, compression cylinder | High temperature and long-term strength requirements are high. | |
Plastic mould | High-output plastic injection mold | Durable and heat-resistant | |
Aerospace structural components | Structural parts that can withstand working temperatures ranging from 400 to 500 degrees Celsius | Special performance requirements |
Application | Recommended Hardness (HRC) |
Extrusion Dies – Aluminum | 46-50 |
Extrusion Dies – Copper | 44-48 |
Extrusion Dies – Steel | 44-48 |
Die Casting Dies | 42-48 |
Die Casting Cores | 44-50 |
Forging Dies – Aluminum | 44-52 |
Forging Dies – Copper Alloys | 44-52 |
Forging Dies – Steel | 40-50 |
Product Form | Size Range |
Round Steel | φ10 – φ800 mm |
Flat Steel | 6-200 × 120-610 mm |
Blocks | 100-600 × 120-1400 mm |
Available Surface Conditions: Black, milled, turned, polished
Value-Added Services:
Hardening and tempering
Vacuum heat treatment
Precision cutting to drawing specifications
Surface grinding and polishing (tolerance: -0 to +0.1mm, flatness: 0.01/100mm)
CNC machining
Deep drilling
Proven Performance – H13 hot work steel is the industry standard for hot work tooling, trusted by die casters, forgers, and extruders worldwide
Extended Tool Life – Superior thermal fatigue resistance means fewer die changes and reduced production downtime
Cost-Effective – Competitive pricing with exceptional value-to-performance ratio
Global Supply – Available in multiple grades (AISI H13, DIN 1.2344, JIS SKD61, GB 4Cr5MoSiV1) to meet your regional specifications
Custom Solutions – We work from your drawings to deliver dies tailored to your exact requirements
Growing Market Demand – The global H13 tool steel market is projected to grow from USD 2.3 billion in 2024 to USD 3.0 billion by 2031, reflecting the sustained demand for high-performance hot work tooling
