In the world of rough face milling, productivity and tool life depend heavily on selecting the right insert geometry and grade. The GREWIN SNHT13T6 Milling Insert has been specifically engineered to deliver exceptional performance in demanding rough milling applications, particularly for WCB cast iron (ZG280-520) workpiece materials.

The GREWIN SNHT13T6 Milling Insert features a sharp edge design that enables light cutting action while maintaining excellent wear resistance and high stability. With a maximum depth of cut capability of Ap < 4.5 mm, this #MillingInsert is ideal for rough face milling operations where consistent performance and long tool life are critical. Designed by #GrewinTools, the SNHT13T6 excels across stainless steel, superalloy, steel, and cast iron applications, making it a versatile choice for shops handling diverse workpiece materials.

Real-world testing on WCB cast iron demonstrates the capabilities of the GREWIN SNHT13T6 Milling Insert. Under cutting conditions of Vc = 226 m/min, Fz = 0.25 mm/tooth, Ap = 3.8 mm, and Ae = 130 mm, with compressed air cooling, the insert delivers stable, reliable performance. When mounted in a D160 x 10T holder, the #SNHT13T6 provides the productivity and surface quality that modern foundries and machining operations demand.

Understanding the GREWIN SNHT13T6 Milling Insert Design

Sharp Edge Geometry for Light Cutting Action

The GREWIN SNHT13T6 Milling Insert features an optimized sharp edge design that significantly reduces cutting forces compared to conventional inserts. This sharp edge geometry provides several important benefits for rough milling operations:

• Reduced power consumption – Lower cutting forces mean less strain on the machine spindle

• Improved surface finish – Sharp edges produce cleaner cuts even at aggressive parameters

• Reduced heat generation – Less friction translates to lower cutting temperatures

For #RoughMilling of WCB cast iron specifically, the sharp edge of the SNHT13T6 helps prevent work hardening and reduces the risk of edge buildup.

Light Cutting Characteristics

The light cutting nature of the GREWIN SNHT13T6 Milling Insert makes it particularly suitable for applications where machine rigidity may be limited or where delicate workpiece fixturing is required. Despite its light cutting action, the insert maintains excellent material removal rates.

When processing #CastIron components such as WCB valve bodies, pump housings, and industrial castings, the light cutting geometry of this #MillingInsert enables smooth operation even at the tested parameters of Vc = 226 m/min and feed rates of Fz = 0.25 mm/tooth.

High Wear Resistance and Stability

The GREWIN SNHT13T6 Milling Insert combines sharp edge geometry with exceptional wear resistance. This balance is achieved through:

• Premium carbide substrate – Provides the toughness needed for interrupted cuts

• Advanced coating technology – The GWP4302FS grade offers excellent wear protection

• Optimized edge preparation – Prevents micro-chipping while maintaining sharpness

For #RoughMilling operations with depth of cut up to Ap < 4.5 mm, the wear resistance of the SNHT13T6 ensures consistent performance throughout the insert's life. High stability during cutting reduces vibration and chatter, which is particularly important when machining large cast iron surfaces with wide radial engagement (Ae = 130 mm).

Technical Specifications of the GREWIN SNHT13T6 Milling Insert

Insert Dimensions and Holder Compatibility

The SNHT13T6 designation follows standard ISO naming conventions, ensuring compatibility with a wide range of industry-standard milling cutters.

Cutting Parameters Summary

Grade Information: GWP4302FS

The GREWIN SNHT13T6 Milling Insert is manufactured in grade GWP4302FS, specifically engineered for:

• Steel (ISO P) – General and alloy steels

• Stainless steel (ISO M) – Austenitic and duplex grades

• Cast iron (ISO K) – Gray, ductile, and WCB castings

• Superalloys (ISO S) – Heat-resistant alloys

This broad material compatibility makes the SNHT13T6 a true #MillingInsert for shops that process multiple material types.

Application Case Study – WCB Cast Iron Rough Face Milling

Workpiece Material: WCB (ZG280-520)

WCB (Cast Steel Grade WCB) is a common material for valve bodies, pump casings, and industrial fittings. According to standard specifications (ASTM A216), WCB cast steel has the following characteristics-1:

• Tensile strength: 485–655 MPa (70–95 ksi)

• Yield strength: ≥ 250 MPa (36 ksi)

• Hardness: 140–197 HB

The material is widely used in the oil and gas, power generation, and general industrial sectors. Machining WCB castings presents challenges including:

• Variable hardness due to casting skin

• Potential sand inclusions and porosity

• Interrupted cuts when machining rough cast surfaces

The GREWIN SNHT13T6 Milling Insert is specifically designed to address these challenges.

Tested Cutting Conditions

The following parameters were successfully validated on WCB cast iron using the GREWIN SNHT13T6 Milling Insert:

Performance Results

Under these conditions, the GREWIN SNHT13T6 Milling Insert demonstrated:

• Stable cutting action – Minimal vibration despite wide radial engagement

• Good wear resistance – Extended tool life between edge changes

• Consistent surface quality – No significant variation across the machined surface

For #RoughMilling of cast iron components, this performance level translates directly into reduced tooling costs and improved productivity.

Application Range of the GREWIN SNHT13T6 Milling Insert

Material Compatibility

For #StainlessSteel applications, the sharp edge design helps prevent work hardening, which is a common challenge when machining austenitic grades like 304 and 316.

Application Types

The GREWIN SNHT13T6 Milling Insert is specifically designed for:

• Rough face milling – Primary material removal on cast surfaces

• Scalping operations – Removing casting skin and scale

• Heavy stock removal – Up to Ap 4.5 mm depth of cut

• Large surface machining – Wide cutters with full engagement

Compatible Machine Tools

The SNHT13T6 performs optimally on:

• Vertical machining centers (VMC) – With rigid spindle designs

• Horizontal machining centers (HMC) – For large castings

• Gantry mills – For oversized components

• Planer mills – For heavy-duty roughing

Operating Recommendations

Cooling and Lubrication

The tested parameters used compressed air cooling, which provides several advantages for cast iron machining:

• No coolant disposal costs – Environmentally friendly operation

• No thermal shock – Prevents edge cracking from intermittent cooling

• Clean operation – No coolant mist or residue

For other materials, flood coolant or MQL may be preferred. Always ensure adequate chip evacuation to prevent recutting.

Parameter Selection Guidelines

For Cast Iron (including WCB):

• Vc: 180–250 m/min (reduce for harder castings)

• Fz: 0.20–0.35 mm/tooth

• Ap: 1.5–4.5 mm

For Stainless Steel:

• Vc: 120–180 m/min

• Fz: 0.15–0.25 mm/tooth

• Ap: 1.0–3.0 mm

For Steel:

• Vc: 180–300 m/min

• Fz: 0.20–0.35 mm/tooth

• Ap: 1.5–4.5 mm

Troubleshooting Common Issues

The GrewinTools Advantage

Quality Commitment

#GrewinTools has established itself as a trusted provider of CNC machine tool accessories and metalworking cutting tools. The GREWIN SNHT13T6 Milling Insert exemplifies our commitment to quality, delivering the performance that modern manufacturing demands.

Technical Support

When you choose GrewinTools, you gain access to experienced applications engineers who can assist with tool selection, parameter optimization, and troubleshooting support.

Conclusion

The GREWIN SNHT13T6 Milling Insert represents the ideal solution for manufacturers seeking a reliable, high-performance rough milling tool for cast iron and steel applications. With its sharp edge geometry, light cutting action, good wear resistance, and high stability at depths up to Ap 4.5 mm, this #MillingInsert delivers consistent results in demanding rough face milling operations.

Whether you are processing WCB castings, stainless steel components, or general steel parts, the GREWIN SNHT13T6 provides the versatility and reliability you need to maintain competitive advantage.

Lydia Choo
Sales Manager, GrewinTools

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