W6mo5cr4v2 Quenching Process Control For M2 High Speed Steel Tools - China

W6Mo5Cr4V2 quenching is the most critical step in heat treating M2 high speed steel, because it fixes the as-quenched structure that tempering will transform.

Correct quenching practice gives HRC 63-66 before tempering with a fine grain; poor control leads to cracking, coarse grain or soft spots that no later tempering can repair.

Recommended Quenching Sequence:

1 - Preheating

- First stage 550-600C for equalization of the whole cross section

- Second stage 850C held just below the transformation point

- Purpose: prevent thermal shock and cracking of large or complex tools 2 - Austenitizing

- Salt bath or vacuum furnace with controlled carbon potential

- Small precision tools: 1180-1200C

- Larger sections and tougher tools: 1200-1230C

- Soak time: about 1-2 minutes per mm of section, do not over-soak 3 - Quenching Media Options

- Salt bath at 500-550C (martempering): best for complex shapes, minimal distortion

- Oil quench: acceptable for simple shapes below 50mm, fast and economical

- Pressurized gas in vacuum furnace: clean parts, medium cooling rate, low distortion

- Air quench: only very small sections, risk of carbide precipitation if too slow 4 - Post-Quench Handling

- Move directly to tempering while parts are still around 100C

- Never leave as-quenched tools overnight: risk of cracking and retained austenite stabilization Common Quenching Defects and Causes:

- Quench cracks: too fast cooling in the martensite range, sharp corners, insufficient preheat

- Soft spots: decarburized surface, uneven bath temperature, vapor blanket in oil

- Coarse grain: overheating above 1240C or excessive soak time

- Carbide network at grain boundaries: quench too slow through 900-750C range Quality Checkpoints After Quenching:

1 - As-quenched hardness HRC 63-66 confirms proper austenitizing.

2 - Grain size check on a broken sample or metallographic section.

3 - Dimensional survey before tempering to catch distortion early.

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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.
  
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