Sandvik Coromant Releases GC4330, GC4340 Insert Grades for Steel Milling

Sandvik Coromant Releases GC4330, GC4340 Insert Grades for Steel Milling
0 comments, 13/11/2018, by , in CAM, News

SANDVIKEN, Sweden, Nov 13, 2018 – Cutting tool and tooling systems specialist Sandvik Coromant is launching GC4330 and GC4340, two new insert grades for steel milling. With the development of advanced production technologies, such as a new substrate, Inveio coating, and an improved post-treatment technology, the new grades provide great opportunities for substantially increased tool life and process security in comparison to the previous generation GC4230 and GC4240 grades, which will now be superseded.




Manufacturers face many challenges when milling ISO P workpieces. For instance, some hard and abrasive steels can generate wear along the flank face of the insert, especially at higher speeds and longer time in the cut. In addition, machining in unstable conditions due to the compromised clamping or long overhang elevates the risk of insert chipping, while thermal fluctuation during machining, especially under wet conditions, can cause crack formation and subsequent sudden breakages.

“Our new grades overcome these issues in many ways,” states Magnus Engdahl, Product Application Manager at Sandvik Coromant. “For instance, the optimized Inveio® coating increases wear resistance and tool life dramatically, without jeopardizing security. With its uni-directional crystal orientation, the coating has a high resistance to thermal cracks, which in turn promotes long and reliable tool life, a factor further supported by a new post-treatment process that strengthens the insert by modifying its mechanical properties.”

A newly developed substrate provides well-controlled grain size distribution, which provides more reliable and predictable tool behavior. In addition, consistent tool life is supported with more narrow edge-rounding (ER) tolerance. Increased tool life will deliver a reduced cost per component, while improved process security gives a predictable performance and less downtime, not to mention higher component quality.

GC4330 is a medium hard grade and is the first choice for roughing to semi-finish face milling, with the tough GC4340 grade preferred for rough shoulder milling and groove milling. Wet and dry machining is supported, although dry machining is recommended.

Both GC4330 and GC4340 are available in the following product families: CoroMill 390 and CoroMill 490 for shoulder milling; CoroMill 345 and CoroMill 745 for face milling; CoroMill 210 for high-feed milling; CoroMill 200 for profile milling; and CoroMill 331 for grooving and parting off. Although the grades are optimized for steel, they also offer suitability for mixed production involving ISO K (cast iron) and ISO M (stainless steel) workpieces.

About Sandvik Coromant

Part of global industrial engineering group Sandvik, Sandvik Coromant is at the forefront of manufacturing tools, machining solutions and knowledge that drive industry standards and innovations demanded by the metalworking industry now and into the next industrial era. Educational support, extensive R&D investment and strong customer partnerships ensure the development of machining technologies that change, lead and drive the future of manufacturing. Sandvik Coromant owns over 3100 patents worldwide, employs over 7,900 staff, and is represented in 150 countries. For more information, visit

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