4140 alloy round bar
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ASTM 4140 Steel Round Bar
AISI 4140 alloy steel is defined as a low alloy steel which has 1% Cr-Mo as strengthening alloy elements.Compared with AISI 4130, it has a higher carbon content with good balance of strength, toughness ,abrasion and impact resistance and heat treatment capabilities,but poor in weldability characteristics.AISI 4140 is generally supplied in quenched and tempered condition with hardness 28-32HRC. 4140 steel is used to manufacture forgings with higher strength and larger quenched cross-section than 35CrMo steel, such as large gears for locomotive traction, supercharger transmission gears, rear axles, connecting rods and spring clips which are subject to great loads, and also used for oil deep well drill pipe joints and salvage tools below 2000m.
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