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Eternal
X37CrMoV5-1 (Material No. 1.2343) is a chromium-molybdenum-vanadium alloy hot-work tool steel conforming to ISO 4957:2018. Renowned for its excellent high-temperature toughness, thermal fatigue resistance, and good thermal conductivity, it has become the standard material of choice in hot-work applications such as die-casting, forging, and extrusion.
This forged product is classified under ISO 4957:2018 as an "alloy hot-work tool steel," suitable for applications where surface working temperatures exceed 200°C.
ELEMENT | wt% |  |
C | 0.33~ 0.41 | |
Si | 0.80 ~ 1.20 | |
Mn | 0.25 ~ 0.50 | |
Cr | 4.80 ~5.50 | |
Mo | 1.10 ~ 1.50 | |
V | 0.30 ~ 0.50 | |
P | ≤ 0.03 | |
S | ≤ 0.03 |
Nation | Grade | Standard |
China | 4Cr5MoSiV | GB/T 1299 |
USA | H11 | AISI |
Germany | 1.2343 | DIN EN ISO 4957 |
France | Z38CDV5 | NF A35-590 |
Japan | SKD6 | JIS G4404 |
Condition | Symbol | Hardness |
soft annealed | +A | ≤ 229 HB |
Physical Properties (Typical Values)
|
Process | temperature | cooling way |
soft annealed | 750 – 790℃ | furnace cooling，hardness ≤ 229 HB |
quenching | 1000 – 1050℃ | Oil, pressurized gas（N₂）、air or 500–550℃ salt bath |
tempering | 500 – 550℃ | furnace cooling，hardness 48–54 HRC |
Application | Use |  |
Die-casting dies | Aluminum alloy and magnesium alloy die-casting molds | |
Forging Dies | Hot forging dies and precision forging tools | |
Extrusion tools | Aluminum profile extrusion dies and extrusion containers | |
Plastic Processing | Injection molds, screws, and barrels |
100% compliant with ISO 4957:2018; EN 10204 3.1/3.2 test certificates provided.
Open-die forging + optimized heat treatment delivers consistent core-to-surface properties, with high hardenability maintained in large sections (>500 mm).
Unique heat number per batch; complete traceability throughout the entire production process.
Available in round bars (Ø20–800 mm), billets, blocks, and custom-shaped forgings.
