Guide To Frequently Asked Questions About Gost 4kh5mf1s Tool Steel - China

GOST 4Х5МФ1С tool steel FAQ

Q1: What is GOST 4Х5МФ1С tool steel equivalent to?

It is the Russian GOST designation of the H13-family hot work tool steel: AISI H13 (UNS T20813), DIN 1.2344 / X40CrMoV5-1, JIS SKD61, GB 4Cr5MoSiV1, BS BH13 - Q2: What hardness can GOST 4Х5МФ1С tool steel achieve?

Annealed delivery ≤241 HB; after hardening at 1020–1040 °C and double tempering, 48–52 HRC is standard, with impact toughness KCU ≈ 40–46 J/cm² retained .

Q3: What is the old name EP572?

ЭП572 (EP572) is the former Soviet electric-furnace steel designation for modern 4Х5МФ1С; you'll still see it on legacy drawings .

Q4: Can I water-cool 4Х5МФ1С dies?

Limited, controlled water cooling is possible thanks to thermal fatigue resistance — standard H13-family practice — but excessive thermal shock will eventually cause checking; follow standard die-cooling design rules.

Q5: 4Х5МФ1С vs 4Х5МФС — which one?

Choose 4Х5МФ1С when wear resistance and thermal fatigue life matter most (die casting, long-run forging).

Choose 4Х5МФС for cost-driven, toughness-led general forging dies.

Q6: Can a Chinese mill supply GOST 4Х5МФ1С tool steel?

Yes — Chinese mills produce it as 4Cr5MoSiV1 (GB/T 1299), which matches the GOST grade chemistry; confirm melting quality, MTC, and UT inspection for export orders .

Songshun Steel Manufacturing & Test

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