In the precision-driven world of CNC machining and mold manufacturing, the finishing and semi-finishing stages on hardened mold steels are among the most demanding applications for cutting tools. When working with materials like S136 and SKD61 in the HRC 45°–55° range, the requirements for surface finish, dimensional accuracy, and tool stability become extremely stringent. The GREWIN GHS Mold-Specific End Mill is engineered specifically for these high-precision applications. Designed for HRC 45°–55°, the GHS Mold-Specific End Mill combines a premium GW09 carbide substrate (0.2-0.4μm grain size, HRA 93.8) with an advanced TiS copper-colored coating (3800 HV, 1300°C oxidation temperature), delivering exceptional wear resistance, thermal stability, and surface finish quality in finishing and semi-finishing operations on S136, SKD61, and other heat-treated die steels. With a continuous working capacity of 8 hours, the GREWIN GHS Mold-Specific End Mill offers performance that rivals leading Japanese brands such as OSG, Mitsubishi, and NACHI.

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Advanced Substrate and Coating Technology in GHS Mold-Specific End Mill

The performance of the GREWIN GHS Mold-Specific End Mill is built upon a premium carbide substrate and a high-performance coating system specifically developed for hardened mold steel applications.

GW09 Substrate: Ultra-Fine Grain for Maximum Hardness and Strength

The GW09 substrate used in the GHS Mold-Specific End Mill represents a premium carbide grade optimized for finishing and semi-finishing of hardened mold steels. With a cobalt content of 9%, an ultra-fine grain size of 0.2-0.4 μm, and a hardness of HRA 93.8, the GW09 substrate delivers exceptional hardness and wear resistance—properties essential for maintaining cutting edge integrity in hardened materials. The bending strength of ≥3800 N/mm² ensures the tool can withstand the cutting forces typical of finishing operations without chipping.

This substrate formulation makes the GREWIN GHS Mold-Specific End Mill especially effective for S136 (stainless mold steel) and SKD61 (hot work tool steel)—materials that combine high hardness with challenging machining characteristics. Industry benchmarks such as Mitsubishi's Mstar series utilize ultra-fine grain carbide (UWC) substrates to achieve broad applicability from raw materials to high-hardness steels up to 55 HRC -5-11.

TiS Coating: High-Temperature Performance and Low Friction

The TiS copper-colored coating on the GREWIN GHS Mold-Specific End Mill represents an advanced PVD coating engineered for demanding finishing applications. The coating’s key properties—3800 HV hardness, 1300°C oxidation temperature, and 0.4 coefficient of friction—deliver three core benefits:

• Extended Wear Resistance: The extremely high hardness protects the cutting edge from abrasive wear in hardened materials.

• Superior Thermal Stability: The elevated oxidation temperature allows sustained performance at higher cutting speeds, enabling increased productivity in finishing operations.

• Reduced Friction: The low coefficient of friction minimizes heat generation and improves workpiece surface finish.

The 1300°C oxidation temperature of the GHS coating exceeds that of many industry-standard coatings. For reference, OSG's WXL coating, used in high-hardness applications, offers +1100°C oxidation temperature and +3100 Hv hardness . The GREWIN GHS series delivers comparable high-temperature protection for extended finishing runs.

Optimized Helix Angles for Specific Geometries

The GREWIN GHS Mold-Specific End Mill series features differentiated helix angle design based on tool geometry:

• Flat End Mills: 45° Helix Angle — optimized for finishing flat surfaces, providing a balance of cutting force reduction and surface quality.

• Ball-Nose End Mills: 30° Helix Angle — optimized for contouring and finishing on curved surfaces, offering stability in radial engagement.

• Corner Radius End Mills: 35° Helix Angle — optimized for finishing with reinforced corners, providing edge protection and surface quality.

This differentiated helix approach ensures that each geometry type in the GHS series delivers optimal performance for its specific application—a design philosophy consistent with leading manufacturers like OSG, whose AE-TS-N series and related end mills are engineered with specific flute geometries for different material applications .

Real-World Performance and Applications

The GREWIN GHS Mold-Specific End Mill is designed for high-precision finishing and semi-finishing across demanding applications.

Material Compatibility and Hardness Range

The GHS Mold-Specific End Mill is suitable for:

• S136: Premium stainless mold steel used in high-gloss and corrosion-resistant molds.

• SKD61: Hot work tool steel widely used in die-casting and hot forging molds.

• Other Hardened Steels: HRC 45°–55° range for heat-treated dies and precision components.

This material coverage makes the GHS series a versatile choice for mold and die manufacturers requiring high-precision finishing tools. Industry practice confirms that mold-specific end mills for hardened materials like S136 and SKD61 require specialized substrates and coatings to achieve the surface finishes demanded in injection mold and die-casting applications .

8-Hour Continuous Working Capacity

A defining feature of the GREWIN GHS Mold-Specific End Mill is its continuous 8-hour working capacity—a performance benchmark that demonstrates the tool's stability and durability in long-duration finishing operations. In large mold manufacturing, finishing operations often run unattended for extended periods. The 8-hour continuous working capacity of the GHS ensures reliable performance through full production shifts, reducing the risk of unexpected tool changes.

Comparison with Industry Benchmarks

The GREWIN GHS Mold-Specific End Mill is designed as a direct alternative to three leading Japanese brands:

Alternative to OSG AE-TS / AQUA Series
OSG's AE-TS series is designed for non-ferrous materials with DLC coating . The GHS series targets the corresponding high-hardness application space, offering comparable performance on S136 and SKD61 for semi-finishing and finishing operations.

Alternative to Mitsubishi MS2000 Series
Mitsubishi's MS series features MS coating and ultra-fine grain carbide (UWC) substrates, covering carbon steel, alloy steel, high-hardness steel up to 55 HRC, and stainless steel . The GREWIN GHS series offers similar substrate technology (0.2-0.4μm grain, 93.8 HRA) and hardness range (45-55 HRC), making it a direct alternative for customers seeking comparable performance.

Alternative to NACHI ACH Series
NACHI's ACH series targets S136, SKD61, and similar mold steels for semi-finishing and finishing, offering high bending strength carbide and wear-resistant coating. The GREWIN GHS series aligns with this performance profile.

Application Summary

The GREWIN GHS Mold-Specific End Mill series delivers a comprehensive, high-precision solution for finishing and semi-finishing on hardened mold steels.

Conclusion

The GREWIN GHS Mold-Specific End Mill series delivers a comprehensive, high-precision solution for finishing and semi-finishing on hardened mold steels. By combining a premium GW09 carbide substrate (0.2-0.4μm grain, HRA 93.8) with a durable and high-temperature-resistant TiS coating (3800 HV, 1300°C), the GHS series provides exceptional wear resistance, thermal stability, and surface finish quality on S136, SKD61, and other heat-treated die steels. With continuous 8-hour working capacity and performance that rivals OSG, Mitsubishi, and NACHI, the GREWIN GHS Mold-Specific End Mill represents a cost-effective solution engineered for the demands of high-precision mold manufacturing.

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About Grewin Tools

Grewin Tools is a leading manufacturer and supplier of precision CNC tooling and metalworking solutions. With over 20 years of experience, we offer a comprehensive range of carbide products including GHS Mold-Specific End Mills, solid carbide end mills, CNC inserts, and tool holding systems.

Contact Us Today

Ready to optimize your finishing and semi-finishing operations with the GREWIN GHS Mold-Specific End Mill series? Contact Grewin Tools for a catalog, technical support, or to request a quote.

Lydia Choo
 WhatsApp: +86 18673327292
 Email: info@gwcarbide.com
 Website: www.grewintools.com

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