Alloy tool steel: 4Cr3Mo3SiV
Standard: GB/T 1299-1985
4Cr3Mo3SiV hot-work die steel, imported from the United States as H10 steel, boasts excellent hardenability, toughness, and high-temperature hardness. The 4Cr3Mo3SiV alloy tool steel can replace steels like 3Cr2W8V for manufacturing hot forging dies, hot rolling dies, hot extrusion dies, and plastic molding dies. Its performance and service life exceed that of 3Cr2W8V steel. It is also used as structural components for aircraft, rockets, and other heat-resistant parts operating at temperatures of 400-500°C.

Chemical Composition

Carbon (C): 0.35～0.45

Silicon (Si): 0.80～1.20

Manganese (Mn): 0.25～0.70

Sulfur (S): ≤0.030

Phosphorus (P): ≤0.030

Chrome (Cr): 3.00～3.75

Nickel (Ni): Allowable residual content ≤ 0.25

Copper (Cu): Allowable residual content ≤ 0.30

Vanadium (V): 0.25～0.75

Tungsten (Mo): 2.00～3.00
Mechanical Properties

Hardness: Annealed, ≤229HB, indentation diameter ≥4.0mm
Heat Treatment Specifications and Microstructure

Heat Treatment Specification: Quenching, preheat at 790±15°C, heating at 1010±6°C (salt bath) or 1020±6°C (furnace controlled atmosphere), hold for 5-15min, air cool, temper at 550°C.
Shipment Status

Steel is supplied in annealed condition.