AISI SAE 4140 alloy steel is a chromium molybdenum alloy steel specification widely used in general purpose high tensile steel for components, like axles, shafts, bolts, gears and hydraulic applications. Similar to alloy grade AISI 4130 chrome moly alloy steel but with a slightly higher carbon content. The higher carbon content of AISI 4140 steel gives greater strength and heat treatment capabilities in comparison to AISI / ASTM 4130 alloy steels, however it does have inferior weldability characteristics.
Common 4140 Steel Specifications
|Standard||DIN 17200||GB/T 3077||AS 1444|
4140 Steel Bar Chemical Composition
AISI 4140 Steel Grade Heat Treatment
Heat ASTM 4140 steels to 800 oC – 850 oC, hold until temperature is uniform throughout the section and cool in furnace.
Heat steel alloy 4140 to 870 oC – 900 oC, hold until temperature is uniform throughout the section, soak for 10 – 15 minutes and cool in still air.
Re-heat 4140 grade steel to 550 oC – 700 oC as required, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm of section, and cool in still air.
4140 steel bar is widely used in hydraulic field, as a professional hydraulic solution expert, Anbao Hydraulic specialized in 4140 hydraulic cylinder barrels, 4140 chrome plated bars, 4140 hollow chrome bars and other 4140 steel products.if you have any inquiry about AISI 4140 steel bars and tubes, please contact us here