4140 vs 9310

4140 vs 9310 : what is the difference between 4140 steel and 8620 steel?

A： Today we are still discussing 4140 steel. As we know that 4140 steel belongs to the alloy structural steel.

B： I found a steel that is very similar to 4140 steel—9310 alloy steel.

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

B： Yes. But the carbon content of 4140 steel is 0.38%-0.43%, while the carbon content of 9310 steel is 0.07%-0.13%.

A： From the analysis of the hardness, 4140 steel is usually supplied ready heat treated to hardness in 28-32 HRC.

B：9310 steel is usually supplied ready heat treated to hardness in 60-62 HRC. 

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

B：9310 steel is mainly used for automotive applications, structural components, and high-performance helicopter transmission gears.

A： So what is the difference between them?

B：9310 steel can be used in some applications without case-hardening, as it exhibits strength with excellent toughness and ductility.

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

B： By the way, for 4140 steel, we can supply the round bar, steel flat bar, and plate.

A： Rectangular pieces can be cut from flat bar or plate to your specific sizes.

B： The above is about the difference between 9310 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.