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High purity and uniform structure: Electroslag remelting (ESR)+forging, with extremely low impurities, no obvious segregation, good isotropy, and polishing up to mirror level.
Strong and tough, with excellent crack resistance: forging refines grain size, evenly distributes carbides, and has an impact toughness 30% higher than ordinary H13. It has strong resistance to thermal fatigue and thermal cracking.
High thermal stability and good red hardness: It does not soften after long-term operation at 500-600 ℃, has excellent high-temperature strength and wear resistance, and is resistant to metal erosion.
Stable heat treatment and small deformation: excellent hardenability, uniform hardness (± 1HRC), heat treatment deformation<0.05%, high dimensional accuracy.
Long lifespan and high reliability: Under die-casting/hot forging conditions, the mold lifespan is increased by 30% -50% compared to ordinary H13, reducing downtime and repair costs.
Good processing and surface treatment properties: easy to cut, polish, nitride, and PVD coating, with strong surface quality and coating adhesion.
GB | JIS | ASTM | EN | DIN | W-Nr. | ГOCT |
4Cr5MoSiV1 ESR | SKD61 ESR | H13 ESR | X40CrMoV5-1 | X40CrMoV5-1 ESR | 1.2344 ESR | 4KH5MF1S |
element | C | Si | Mn | Cr | Mo | V | P | S |
scope | 0.35–0.42 | 0.8–1.2 | 0.2–0.5 | 4.8–5.5 | 1.2–1.5 | 0.85–1.15 | ≤0.025 | ≤0.010 |
Tensile strength Rm (MPa) | Yield strength ReL (MPa) | Elongation A (%) | Impact toughness KV2 ( V-shaped notch J/cm² ) | hardness (HRC) |
600-750 | ≥450 | ≥15 | ≥ 40 | 44-46 |
Smelting: EAF → LF → VD → ESR electric slag remelting (high purity, uniform structure).
Forging: Three upsetting and three pulling+high temperature diffusion forging, crushing carbides and refining grains
Heat treatment: Annealing (220-250HB) → Rough machining → Quenching (1010-1030 ℃ air cooling) → Tempering (540-650 ℃ secondary tempering), with adjustable hardness of 46-54HRC.
At room temperature: hardness of 50-54HRC, impact energy ≥ 40J, tensile strength of 1200-1400MPa.
High temperature: 600 ℃ still maintains ≥ 48HRC, resistant to softening, thermal cracking, and thermal fatigue.
Organization: ESR+forging → no obvious segregation, fine grains, uniform carbides, mold life 30-50% higher than ordinary H13.
Size: Forged round with a diameter of 140-700mm
Surface: black leather forging, rough turning, fine turning, peeling, polishing.
Tolerance: forged circle 0/+5mm, smooth circle 0/+1mm, precision machined h9/h8.
Ultrasonic testing: UT (ultrasonic)+MT (magnetic powder), according to GB/T 6402/EN 10228 standard.
Aluminum/magnesium alloy die-casting molds, hot extrusion molds, and hot forging molds (for automotive/aerospace precision forgings).
High end mold core components require high toughness, heat fatigue resistance, and erosion resistance.
