CPM REX 25 is a super high-speed steel made without cobalt. It is comparable to AISI Type T15 cobalt-containing high-speed steel in response to heat treatment, properties, and tool performance. CPM REX 25 is recommended for machining operations requiring heavy cuts, high speeds and feeds, and difficult-to-machine materials of high hardness and abrasion resistance. Typical applications are boring tools, drills, gear cutters, punches, form tools, end mills and broaches. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on forming, heat treating, machining, and surface treatment. Filing Code: TS-365. Producer or source: Crucible Materials Corporation.

CPM REX 20 is the second in a family of super high-speed steels made without cobalt. (For the first one, see CPM REX 25, Alloy Digest TS-365, July 1980.) CPM REX 20 is comparable to the AISI Type 40 series of high-speed steels, particularly AISI Type 42, in heat-treating response and tool performance. CPM REX 20 is designed for use in machining operations requiring heavy cuts, high speeds and feeds, and for difficult-to-machine materials that are high in hardness and abrasion resistance. Typical applications are boring tools, drills, gear cutters and punches. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on forming, heat treating, and machining. Filing Code: TS-398. Producer or source: Crucible Specialty Metals Division, Colt Industries.

CPM Rex 121 is a super high-speed steel with significantly higher wear resistance and red hardness than other high-speed steels. It is best suited for applications requiring high cutting speeds. It may provide an alternative to carbide where carbide cutting edges are too fragile. The annealed hardness is approximately 350-400 HB, and maximum hardness is approximately 72 HRC. This datasheet provides information on composition, physical properties, microstructure, hardness, and elasticity as well as fracture toughness. It also includes information on high temperature performance and wear resistance as well as heat treating and surface treatment. Filing Code: TS-591. Producer or source: Crucible.

Crucible CPM Rex 54 is a high-speed tool steel with cobalt added to improve red hardness. It is often used as an upgrade over grades M4 and M35. This datasheet provides information on composition, physical properties, microstructure, hardness, and elasticity. It also includes information on forming, heat treating, and surface treatment. Filing Code: TS-608. Producer or source: Crucible Service Centers Divisional Headquarters.

Crucible CPM Rex 66 is a high-speed tool steel of the tungsten type made by the CPM process. This datasheet provides information on composition, physical properties, microstructure, hardness, and elasticity. It also includes information on heat treating and machining. Filing Code: TS-704. Producer or source: Crucible Industries LLC.

Crucible CPM Rex 54 HS is a cobalt-bearing high speed tool steel that is produced by the proprietary Crucible Particle Metallurgy (CPM) process. It combines the wear properties of the popular high vanadium M4 grade with the red hardness of the cobalt-bearing M35/Crucible CPM Rex 45 HS grades. Crucible CPM Rex 54 HS may be used as an upgrade for improved red hardness over M3 or M4 without giving up the abrasion resistance, or as an upgrade for improved wear resistance over M35 or Crucible CPM Rex 45 HS without giving up the red hardness. This datasheet provides information on composition, physical properties, microstructure, hardness, and elasticity. It also includes information on wear resistance as well as heat treating and surface treatment. Filing Code: TS-818. Producer or source: Crucible Industries LLC.

REX M3S-2 is a sulfur-bearing high-speed tool steel offering very good abrasion resistance and resistance to softening at elevated temperatures. CPM REX M3S-2, produced by the Crucible Particle Metallurgy process, is an improved-quality product with finer grain size, better toughness and better grindability than the conventionally produced REX M3S-2. Other characteristics and properties of the two products are very similar (See General Characteristics for more details). This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming, heat treating, and machining. Filing Code: TS-260. Producer or source: Crucible Specialty Metals Division, Colt Industries.

CPM REX 45 is an 8% cobalt high-speed steel which has excellent hot hardness along with good wear resistance and toughness, making it suitable for difficult machining applications. This datasheet provides information on composition, physical properties, microstructure, hardness, and elasticity as well as fracture toughness. It also includes information on wear resistance as well as forming and heat treating. Filing Code: TS-534. Producer or source: Crucible Materials Corporation.

Crucible CPM REX M35HCHS is a modification of the AISI M2 high-speed steel by an addition of cobalt and produced by powder metallurgy to be homogeneous with good toughness. This datasheet provides information on composition, physical properties, microstructure, hardness, and elasticity. It also includes information on forming and machining. Filing Code: TS-595. Producer or source: Crucible.

Crucible CPM Rex 76 (HS) is a superhigh-speed steel that can be heat treated to very high hardness levels. It is made by the Crucible Particle Metallurgy (CPM) process. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming, heat treating, machining, and surface treatment. Filing Code: TS-304. Producer or source: Crucible Service Centers Divisional Headquarters. Originally published July 1976, revised 2006.

CPM Rex T15 is a tungsten-type high-speed steel containing high carbon and vanadium for very high hardness and maximum wear resistance, and cobalt for good red hardness. It is now made exclusively by Crucible’s particle metallurgy process, resulting in improved quality and grindability. This alloy was designed for use in difficult machining operations requiring heavy-duty cuts, high speeds and feeds, and for difficult-to-machine materials that are high in hardness and abrasion resistance. This datasheet revision updates chemistry, properties, and the benefits of high sulfur (HS). This datasheet provides information on composition, physical properties, hardness, elasticity, and bend strength as well as fracture toughness. It also includes information on wear resistance as well as forming, heat treating, and machining. Filing Code: TS-249. Producer or source: Crucible Service Centers. Originally published as CPM REX T15, January 1973, revised March 2007.

Crucible CPM Rex M4 HC (HS) is a high-vanadium high-speed tool steel made by the Crucible particle metallurgy (CPM) process. This higher-carbon modification of M4 (See Alloy Digest TS-264, November 1973) has high hardening. It also comes with a high-sulfur modification for large cross-section pieces to ease machinability. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on forming, heat treating, machining, and surface treatment. Filing Code: TS-639. Producer or source: Crucible Service Centers Divisional Headquarters.

CPM REX M3-1 is a modification of M3-2 with lower carbon and vanadium. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on surface qualities as well as forming, heat treating, and machining. Filing Code: TS-693. Producer or source: Crucible Service Centers.

Micro-Melt M48 alloy is a superhigh-speed tool steel with a high alloy content and capable of achieving a hardness of 70 HRC. The alloy is used in various tooling and die inserts. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming and heat treating. Filing Code: TS-622. Producer or source: Carpenter Specialty Alloys.