W350 Steel

W350 Steel is a premium hot work tool steel developed by Fushun Special Steel for demanding applications involving high thermal shock, strong mechanical impact, and continuous hot working conditions.

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Product Introduction

W350 Steel High-performance Hot Work Tool Steel – Superior Thermal Fatigue Resistance & Ultra-high Toughness

W350 Steel is a premium hot work tool steel developed by Fushun Special Steel for demanding applications involving high thermal shock, strong mechanical impact, and continuous hot working conditions.
Designed as an enhanced-grade alternative to conventional H13/1.2344, W350 offers higher purity, improved toughness, and excellent resistance to thermal fatigue cracking-making it ideal for high-output die casting and forging operations.

Product Parameters (Specification)

Property	Description
Material Type	High-performance hot work tool steel
Hardness	HRC 46–52 (after vacuum quenching & tempering)
Working Temperature	Up to 600–620°C
Microstructure	Ultra-clean tempered martensite with refined carbides
Heat Treatment	Vacuum quenching + double/triple tempering
Application	Die casting molds, hot forging dies, extrusion dies, high-temperature tooling

Product Features & Applications

Enhanced Thermal Fatigue Resistance

W350 significantly reduces heat cracking, ideal for Al/Mg/Zn die casting molds with frequent thermal cycling.

Ultra-high Toughness & Impact Strength

Special alloy optimization and ESR-level refining ensure excellent resistance to cracking under high load.

Stable Hardness at Elevated Temperatures

Maintains wear resistance and mechanical stability in long-term hot work operations.

Excellent Machinability After Hardening

Supports precision machining, polishing, EDM, and nitriding with minimal distortion.

Wide Application Range

Perfect for aluminum die casting dies, hot forging tools, aluminum extrusion dies, high-temperature injection molds, and hot shear blades.

Product Details

W350 is manufactured using advanced smelting technologies including vacuum degassing, controlled alloy refining, and optimized forging processes.

This results in a dense, homogeneous microstructure with reduced segregation and uniformly distributed carbides.

After vacuum quenching and multi-stage tempering, W350 Steel achieves excellent dimensional stability, deep hardenability, and outstanding resistance to thermal fatigue, making it suitable for continuous industrial hot work environments.

Product Qualification

Produced under ISO 9001:2015 quality standards
Ultrasonic tested for internal integrity (100% passed)
Refined through advanced smelting ensuring high purity and homogeneity
International equivalents: Enhanced grade H13 / 1.2344 / SKD61

FAQ

Q1: What hardness can W350 reach after heat treatment?

W350 achieves HRC 46–52 after vacuum quenching and tempering.

Q2: How does W350 compare with H13/1.2344?

W350 provides higher purity, better toughness, and stronger thermal fatigue resistance than standard H13.

Q3: What applications is W350 suitable for?

High-performance die casting molds, hot forging dies, aluminum extrusion tools, and other hot work tooling.

Q4: Is W350 suitable for nitriding?

Yes. Nitriding improves surface hardness and wear resistance without compromising core toughness.

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