Base Materials

Following are descriptions of the screw materials listed in the Selector Guide.

Chromium alloy steel

The material used meets the ANSI 4140 specification (DIN 42CRO4 equivalent.) This is a medium-carbon alloy steel with good yield strength. It is deep-hardened to Rockwell values of 28-32 Rc.

Nitriding steel

The material, Nitralloy 135M, is heat-treated to develop high core strength, then nitrided to achieve very high case hardness of 66-69 Rc.

CPM (9V/10V)

Tool steels made by the Crucible Particle metallurgy process provides toughness and wear resistance. Usually through-hardened to 56-58 Rc. We do not recommend hardfacing or rebuilding screws made of these alloys.

PH stainless steels

Precipitation-hardened stainless steels 17-4 and 15-5 offer high strength and excellent corrosion resistance. Usually heat-treated to H1150 condition, resulting in a Rockwell hardness of 32 Rc.

Hastelloy C-276

Nickel wrought alloy for highly corrosive applications. Excellent resistance to stress, corrosion, cracking and pitting. One of the most versatile wear-resistance alloys available.

Inconel 625, 718

Alloys with high nickel and chromium content that provide excellent corrosion resistance and good strength. The 718 grade can be heat-treated, increasing its resistance to compression.

Xaloy, Inc., 104 Parker Street. Tel: 978-462-3163; Fax: 978-463-9842.