4140 vs 4340

4140 vs 4340 : what is the difference between 4140 steel and 4340 steel?

A： Let me share with you something interesting. My customer—— Mike asked me what is the difference between P20 steel and 4140 steel.

B： Distinguish from the type of steel, 4140 steels, and 4340 steel are all alloy steels.

A： From the analysis of the composition, they all contain Chromium and molybdenum.

B： Yes. But 4340 steel has Nickel content, while 4140 steel does not.

A： From the analysis of the hardness，4140 steel is usually supplied with ready heat treated to hardness in 18-22 HRC.

B： Hardened and tempered 4340 alloy steel can be nitrided, giving a surface hardness of up to 60 HRC. 

A： In terms of use, 4140 steel can be used for engineering structural parts, like high tensile shafts and gears.

B：4340 steel can be also used for engineering structural parts, like high tensile shafts and gears. 

A： So what is the difference between them?

B：4340 steel is used in most industry sectors for applications requiring higher tensile/yield strength than 4140 steel can provide.

A： I hope that customers should consider what kind of performance you need for the steel you purchase and then buy on demand. 

B： The above is about the difference between P20 steel and 4140 steel. If you want to know more, you can visit our website：www.otaisteel.com

A： You can also send an email or call us.

Otai does not act as a material handler. We possess proprietary technology and continuously iterate. We undertake every order to end and solve customer’s problems without any hesitation on responsibility. We are welcome to your kind inquiry.