Skh51 W6mo5cr4v2 Cross Reference Guide For Global Purchasing Teams - China

SKH51 W6Mo5Cr4V2 – One Steel, Three Names: How To Buy Confidently Across Standards When a drawing says SKH51, a quote sheet says W6Mo5Cr4V2, and a competitor offer says M2 or 1.3343, many buyers wonder whether they are comparing the same material.

The answer is yes — these are designation differences, not quality differences.

This cross-reference guide explains what changes between the names and what must never change in your purchase specification.

The equivalence table at a glance:

- SKH51 — JIS G4403 (Japan)

- W6Mo5Cr4V2 — GB/T 9943 (China)

- M2 — AISI/ASTM A600 (USA)

- 1.3343 — DIN/EN (Germany)

- All share the same balanced W-Mo chemistry: 6% tungsten, 5% molybdenum, 4% chromium, 2% vanadium What actually differs between suppliers:

1 - Smelting route: EAF + LF + forging versus powder metallurgy (PM) — PM offers finer carbides at a higher price point; standard SKH51 W6Mo5Cr4V2 covers most drill, tap and die applications.

2 - Annealed condition: properly annealed stock arrives at HB 255 max; poorly annealed bars distort more during hardening.

3 - Testing depth: UT inspection on large sections and full heat-number traceability separate serious mills from traders.

4 - Certification: a genuine mill certificate lists the exact chemistry per heat — C 0.80–0.90, Cr 3.80–4.40, Mo 4.50–5.50, W 5.50–6.75, V 1.75–2.20 - Purchasing tips when orders specify one name only:

- Accept any of the four designations in your PO with the words "chemical composition per AISI M2" to protect your spec.

- Insist on hardness data after heat treatment (HRC 63–65 with triple tempering at 550–580°C).

- For export orders, confirm packing (bundles with rust-proof paper and steel strapping) before shipment.

Songshun supplies SKH51 / W6Mo5Cr4V2 / M2 / 1.3343 in round bar, flat bar, plate and block formats, dia 3–300mm and thickness 5–300mm, ex-stock common sizes with mill certificate and UT report included.

Send your drawing or size list for a same-week quotation.

Songshun Company Website: https: //songshunsteel.

com/

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