High Speed Tool Steel

We sell a wide variety of high speed tool steels in sheet, plate and cut to size pieces. Standard high speed steels are used in high speed cutting tool applications. We carry M type, T type and CPM grades of high speed steels. The M type steels are typically lower in initial cost, followed by the T type and finally the CPM grades. Below is a list of what we carry, a summary of their key characteristics and typical alloy content.

Molybdenum or M series steels contain molybdenum, tungsten, chromium, vanadium, cobalt and carbon as the principle alloying elements. M series steels are typically tougher than T series steels at the same hardness. Otherwise, their properties are similar. The T series steels use tungsten, chromium, vanadium, cobalt and carbon as the principle alloying elements. T type steel exhibit high red hardness and wear resistance. They are also less susceptible to decarburization at high temperatures than M type steels. The high alloy content of T type steels produces a large number of hard, wear resistant carbides. The most wear resistant steel of this group is T-15.

Chemical requirements, Percent (Maximum unless otherwise noted)

Grade C Mn P S Si Cr V W Mo
M-1 .78/.88 .15/.40 .03 .03 .20/.50 3.50/4.00 1.00/1.35 1.40/2.10 8.20/9.20
M-2 .78/.88 .15/.40 .03 .03 .20/.45 3.75/4.50 1.75/2.20 5.50/6.75 4.50/5.50
M-3/1 1.00/1.10 .15/.40 .03 .03 20/.45 3.75/4.50 2.25/2.75 5.50/6.75 4.75/6.50
M-3/2 1.15/1.25 .15/.40 .03 .03 20/.45 3.75/4.50 2.75/3.75 5.50/6.75 4.75/6.50
M-4 1.25/1.40 .15/.40 .03 .03 20/.45 3.75/4.75 3.75/4.50 5.25/6.50 4.25/6.50
M-42 1.05/1.15 .15/.40 .03 .03 .15/.65 3.50/4.25 .95/1.35 1.15/1.85 9.00/10.00+Co 7.75/8.75
T-15 1.50/1.60 .15/.40 .03 .03 .15/.65 3.75/5.00 4.50/5.25 11.75/13.0 1.00 Max + Co 4.75/5.25

We carry four CPM grades of high speed steel. CPM M-4 and CPM T-15 are well known and have similar chemistries to wrought M-4 and T-15. The main difference is the fine carbide structure that the CPM process produces makes grinding these grades much easier. CPM Rex 20 and CPM Rex-76 are highly alloyed grades that cannot be manufactured by conventional steelmaking. CPM Rex20 is cobalt free and yet outperforms M-42. CPM Rex-76 offers a good combination of toughness and high red hardness and also makes an excellent substrate for coatings such as TiAlN. CPM Rex-76/ can be heat treated to Rc 68 to 70.

The exact chemistry of the following grades is proprietary information of Crucible Industries LLC. Only the nominal content is given unless otherwise noted.

Grade C Mn P S Si Cr V W Mo
CPM M-4 1.4 .30 .03Max .06 .55 4.00 4.00 5.70 5.15
CPM T-15 1.6 .30 .03Max .06 .30 4.00 4.90 12.25 .75Max + Co 5.00
CPM Rex-20 1.32 .30 .03Max .07Max .30 3.75 2.00 6.25 10.50
CPM Rex-76 1.50 .30 .03Max .06 .30 3.75 3.15 10.00 5.25 + Co 9.00

CPM, Rex-20 and Rex-76 are registered trademarks of Crucible Industries LLC

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