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     | For mordern industrial production, particularly mass production, machining is one of the most important shaping and forming processes. Almost all tools employed for this purpose are made from high speed steels. In recent times, the use of high speed steels has also gained increasing importance for chipless shaping, eg. for extrusion, blanking and punching tools. With regard to chemical composition, distinction made between W-, Mo- and W-Mo alloyed steel grades which, depending on the dominant stress they will be exposed to contain different amounts of carbon, vanadium and cobalt. |
| Carbon | : forms carbides, increases wear resistance, is responsible for the basic matrix hardness. |
|---|---|
| Tungsten and molybdenum | : improve red hardness, retention of hardness and high temperature strength of the matrix, form special carbides of great hardness. |
| Vanadium | : forms special carbides of supreme hardness, increases high temperature wear resistance, retention of hardness and high temperature strength of the matrix. |
| Chromium | : promotes depth hardening, produces readily soluble carbides. |
| Cobalt | : improves red hardness and retention of hardness of the matrix. |
Response to Heat Treatment| Powmaxgrade | Chemical Composition (Average Value in %) | Standards | ----------Applications---------- | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| C | Cr | Mo | V | W | Co | BOHLER | AISI | BS | IS | JIS | DIN | ||
| IT1 | 0.75 | 4.1 | - | 1.1 | 18.0 | - | S 200 | T1 | BT 1 | XT72W18 Cr4V1 | SKH-2 | S 18-0-1 | Turning, Planing and slotting tools, taps, twist drills, threading dies, profile cutting tools, broaching tools, reamers. |
| IT4 | 0.75 | 4.3 | 0.65 | 1.1 | 18.0 | 5.0 | S 305 | T4 | BT 4 | XT75W18 Co5Cr4MoV1 | SKH-3 | S18-1-2-5 | Turning, planing and milling tools, in particular for roughing work. |
| IT15 | 1.50 | 4.5 | - | 5.0 | 12.5 | 5.0 | S 308 | T15 | BT 15 | - | - | S12-1-4-5 | Turning tools for finishing a precision-cutting work. Where max. abrasion resistance and hardness retention and red hardness is required. |
| IT42 | 1.25 | 4.0 | 3.6 | 3.2 | 9.3 | 10.0 | S 700 | - | BT 42 | XT125WCo10 CrMo4V3 | SKH-57 | S10-4-3-10 | Turning and milling tools for roughing and finishing work,wood working tools, highly stressed cold work tools, tooltool bits. |
| IM 2 | 0.90 | 4.1 | 5.0 | 1.8 | 6.4 | - | S 600 | M2 | BM 2 | XT87W6Mo5 Cr4V2 | SKH-51 | S 6-5-2 | Taps, twistdrills, reamers milling and broaching tools, metal saws, milling tools of all types, wood working tools, cold work tools. |
| IM 3 CL2 | 1.20 | 4.3 | 5.1 | 3.3 | 6.4 | - | S 607 | M3 CL2 | BM 4 | - | SKH-53 | S 6-5-3 | |
| IM 35 | 0.92 | 4.1 | 5.0 | 1.9 | 6.4 | 4.8 | S 705 | M41 | BM 35 | XT90W6Co Mo5Cr4V2 | SKH-55 | S 6-5-2-5 | Turning, planing tools of all types, milling cutters, broaches and hobs, taps, twist drills, wood working tools, cold work tools. |
| IM 42 | 1.10 | 3.9 | 9.2 | 1.2 | 1.4 | 7.8 | S 500 | M42 | BM 42 | XT110Mo10 Co8Cr4W2 | SKH-59 | S 2-10-1-8 | Milling cutters, twist drills, taps, broaching tools, cold work tools. |
| IV 3 | 0.99 | 4.0 | 2.7 | 2.4 | 2.9 | - | S 610 | - | - | - | - | S 3-3-2 | Economical high speed steel grade. Taps, drills, reamers, milling tools, wood working tools, cold work tools, tool bits. |
| POPULAR GRADES | Chemical Composition (Average Value in %) | ---------------APPLICATIONS--------------- | |||||
|---|---|---|---|---|---|---|---|
| C | Cr | Mo | V | W | Co | ||
| ASP 23 | 1.27 | 4.2 | 5.0 | 3.1 | 6.4 | - | Economical PM high speed grade. Turning and milling tools, highly stressed cold work tools, tool bits. |
| ASP 30 | 1.27 | 4.2 | 5.0 | 3.1 | 6.4 | 8.5 | Machining tools, eg.: for machining of nickel-base and titanium alloys, for heavy and interrupted cuts, such as milling cutters, twist drills, taps and broaching tools. |
| ASP 60 | 2.30 | 4.0 | 7.0 | 6.5 | 6.5 | 10.5 | Turning and milling tools for roughing and finishing work, wood working tools, highly stressed cold work tools, tool bits. |
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