Alloy Steel 4140 with High Tensile

4140 is a chromium molybdenum alloy steel with high tensile. It is similar to grade Grade 4130, but with a slightly higher carbon content. The higher carbon content of alloy steel 4140 gives greater strength and heat treatment capabilities in comparison to Alloy 4130. Grade 4140 alloy steel with high tensile is availabe in AISI, SAE and SAME standard.

Alloy steel 4140 is now available with improved machinability, which greatly increases feeds and/or speeds, while also extending tool life without adversley affecting mechanical properties. AISI/ SAE/ SAME 4140 alloy steel is supplied in square bars, and flat bars.
Alloy Steel AISI/ SAE/ SAME4140 Heat Treatment:
Pre hardened and tempered 4140 can be further surface hardened by flame or induction hardening and by nitriding.
Preheat the steel carefully, then raise the temperature to 1150-1200°C for forging. Do not forge below 850°C.
Heat the Alloy steel 4140 slowly to 800-850°C and allow enough time for the steel to be thoroughly heated. Cool slowly in the furnace to 480°C followed by air cooling.
4140 alloy steel is usually supplied ready heat treated to 18-22HRC. If further heat treatment is required annealed alloy steel 4140 should be heated slowly to 840-875C and after adequate soaking at this temperature quench in oil. Temper as soon as the tools reach room temperature.
AISI/ SAE/ SAME 4140 alloy steel is commonly used for a variety of applications in the oil and gas sector. Typical applications include components such as connection rods, collets, conveyor pins, gears, stem assemblies, pump shafts and tool holders.