4130 vs 4340

4130 vs 4340 : what is the difference between 4130 steel and 4340 steel?

A： Today we will discuss 4130 steel and 4340 steel.

B： Distinguish from the type of steel, 4130 steel 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 4130 steel does not.

A：4130 steel has an excellent strength to weight ratio and is considerably stronger and harder than standard 1020 steel, but is not easily welded, requiring thermal treatment both before and after welding to avoid cold cracking.

B：4340 steel is “ultra-high” strength steel classified a medium-carbon, low-alloy steel. 4340 has high strength, ductility, toughness, creep resistance, and fatigue resistance relative to most other steels. High degrees of hardenability are achievable in the alloy, with HRC hardnesses ranging from 24 to 53 depending on the heat treatment.

A： So what is the difference between them? 

B：4130 steel has a higher carbon level, giving it improved weldability, at the expense of through-thickness strength.

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 4130 steel and 4340 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.