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Alloy Steel

Alloy steels are steels containing elements such as chromium, cobalt, nickel, etc. Alloy steels comprise a wide range of steels having compositions that exceed the limitations of Si, Va, Cr, Ni, Mo, Mn, B, and C allocated for carbon steels.

In comparison with carbon steels, alloy steels are a lot more responsive to mechanical and heat treatments. Alloy steels can be subjected to unique melting and deoxidization processes for specific kind of applications.

Alloy Steel 4130

A common general purpose grade of medium carbon, Cr-Mo steel. Flexibility afforded by heat treatment options allows it to attain a range of toughness and strength values. Good hardenability, strength, wear resistance, toughness, and ductility.

Alloy Steel 4140

Normalized: heated to 815°C, air cooled. Medium-carbon steel with high hardenability and good fatigue, abrasion and impact resistance.

Alloy Steel 4145

Oil quenched. Forging temp.: 1205°C (2200°F) max. Annealing temp.: 790 – 845°C. Hardening temp.: 815 – 845°C. Tempered to desired hardness.

Alloy Steel 4330

A heat-treatable steel alloy (for high strength) containing chromium, nickel and molybdenum. Carbon content is in the 0.30% range and in the heat-treated condition the alloy has good toughness and fatigue strength as well as good strength. 

Alloy Steel 4340

AISI 4340 has a favorable response to heat treatment (usually oil quenching followed by tempering) and exhibits a good combination of ductility and strength when treated thusly. Uses include piston pins, bearings, ordnance, gears, dies, and pressure vessels.

Alloy Steel 8620

AISI 8620 is a harden-able chromium, molybdenum, nickel low alloy steel often used for carburizing to develop a case-hardened part. This case-hardening will result in good wear characteristics.