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H13 steel (equivalent to China's 4Cr5MoSiV1) is a representative grade of chromium-molybdenum-vanadium hot-work tool steel. It is known for its good high-temperature strength, resistance to thermal fatigue, and hardenability. It is widely used in high-temperature processes such as aluminum extrusion dies, die-casting molds, and hot forging dies.
However, large-size H13 mold steel often faces problems caused by size effects, such as uneven composition, poor toughness in the center, and inconsistent quality between different batches. Domestic products still lag behind top international brands, so high-quality H13 steel has long been imported.
Our product uses a complete production process including electro-slag remelting (ESR), high-temperature diffusion annealing, and isothermal forging. It is specially designed for large-size mold steel to solve the key problem of poor center toughness in large cross-section blocks.
ELEMENT | wt% |  |
C | 0.37 ~ 0.42 | |
Si | 0.80 ~ 1.20 | |
Mn | 0.20 ~ 0.50 | |
Cr | 5.00 ~ 5.50 | |
Mo | 1.20 ~ 1.75 | |
V | 0.80 ~ 1.20 | |
P | ≤ 0.025 | |
S | ≤ 0.005 | |
Fe | Bal. |
Nation | Grade | Standard |
China | 4Cr5MoSiV1 | GB/T 1299 |
USA | H13 | ASTM A681 |
Germany | 1.2344 / X40CrMoV5-1 | DIN EN ISO 4957 |
Sweden | ASSAB 8407 / Orvar Supreme | Company（Uddeholm） |
Japan | SKD61 | JIS G4404 |
International | T20502 | ISO |
Item | Data | Test standard |
Impact energy without notch (lateral/longitudinal) | ≥ 280J | NADCA #207 |
Isotropy (lateral/longitudinal ratio) | ≥ 0.85 | — |
The three-dimensional direction hardness after quenching and tempering of the heart part | HRC 44-46 | 1010±10℃油冷+≥593℃两次回火 |
Annealing hardness | ≤ 223 HBW | — |
Grain size | ≥ 8.0 | GB/T 6394 |
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.
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 |
How does this product compare in terms of performance to imported H13 steel (such as 8407 and SKD61)?
This product is manufactured using a combination of electroslag remelting, high-temperature diffusion and isotropic forging processes. It achieves an impact energy of ≥280 J and an isotropy of ≥0.85, with an annealed microstructure meeting NADCA #207 AS1–AS4 grades. Its performance specifications are on a par with international best practice, making it a direct substitute for imported products whilst offering a more competitive production cost.
How can the size effect in large-dimension mould steel be addressed?
Why is the material removed from the furnace and immersed in water twice during the annealing process?
