Jis Skh51 Esr Steel Cleaner Microstructure For Demanding Punch And Die Applications - China

JIS SKH51 ESR Steel – What Electric Slag Remelting Changes In Your Tool Steel Standard JIS SKH51 (equal to AISI M2, DIN 1.3343 and GB W6Mo5Cr4V2) is an excellent general-purpose high speed steel.

But when a punch breaks in a progressive die at 2 a.m. or a fine blanking edge chips every second week, the root cause is often hidden inside the steel: inclusions and carbide segregation that conventional EAF melting cannot fully remove.

That is the problem JIS SKH51 ESR steel was developed to solve.

What the ESR process actually does:

1 - The as-cast electrode is remelted through a reactive slag layer, drop by drop — non-metallic inclusions are captured by the slag and the liquid pool solidifies under controlled conditions.

2 - The result is a much cleaner steel: fewer and smaller inclusions, meaning fewer internal stress raisers where cracks start.

3 - Solidification is slow and directional, which sharply reduces carbide segregation and banding compared with conventional ingot casting.

Measurable differences your QC lab can verify:

- Inclusion rating clearly better than standard EAF SKH51 (per ASTM E45 or comparable methods)

- Finer, more uniform carbide distribution across the whole cross section

- Better transverse toughness — the direction where conventional HSS is weakest Where SKH51 ESR steel pays for itself:

- Fine blanking punches and die inserts under high cyclic loads

- Thick-sheet stamping where edge chipping destroys ordinary tools

- Precision components where sudden punch fracture stops an entire production line

- Any tool where the cost of failure per hour far exceeds the modest ESR premium Processing is identical to standard SKH51: annealed delivery HB 255 max, austenitize 1200–1240°C, triple temper 550–580°C to HRC 63–65 - Your existing recipe works unchanged — only the internal cleanliness improves.

Songshun supplies JIS SKH51 ESR steel in round bar, flat bar and cut blocks, with full documentation: ESR heat reference, mill certificate with exact chemistry (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), UT report and optional third-party inspection before shipment.

Send us your current failure problem and tool drawing — our engineers will tell you honestly whether ESR grade brings you enough benefit to justify the switch, and quote within 12 hours.

Songshun Company Website: https: //songshunsteel.

com/

Company Contact:

• Posted By: Dongguan Songshun Mould Steel Co., Ltd.

• Phone: 0086 0769 85475596

• Address: 1st Floor, No. 1, Dongda Fourth Street, Shatou Community, Chang'an Town, Dongguan , GuangDong , China

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• Website: https://songshunsteel.com/

• Business Description: Established in 2009,Songshun Steel supplies a wide range of carbon, alloy and tool steel products, including high speed tool steel, cold work tool steel, hot work tool steel, plastic mould steel, engineering steel and machine structural steel etc.
  
  After more than 10 years development and growing, Songshun Steel becomes one comprehensive special steel factory, stockist and exporter.
  
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