4340 steel heat treatment- Through-Hardening Low Alloy Steel Bar 4340 | OTAI

What is 4340 steel

4340 alloy steel is a high-quality Quenched and Tempered Alloy Structural steel, It belongs to the high-quality medium carbon, Oil Quenched & Tempered Hardness is 28-34 HRc.4340 Annealing delivery hardness less than 250HB.

4340 steel properties are very similar to GB 40CrNiMo steel, JIS SNCM439, and DIN 1.6511 36CrNiMo4 Alloy structural steel. In most work environments, 4340 is equivalent to 40CrNiMo, 1.6511 36CrNiMo4, and SNCM439 steel.

Why Choose OTAI

1)All year round, Otai can guarantee 4340 bars’ stock in different thicknesses and lengths, which can be customized.

2)After placing an order, shipment can be arranged immediately.

3)Otai is a leading China supplier of 4340 steel, working with Bohler, Uddeholm, Thyssenkrupp, with ISO9001 certified.

Customer’s story

We would like to share a real case of our customer with you. Mohamed from Egypt sent us an inquiry for the 4340 grade of steel. After giving her a quote, he gave us feedback that our price is more expensive than others. We sent him the MTC to prove it was the real 4340. And suggested he compare whether the MTC of low-priced is the real 4340 or not. (4340 steel heat treatment)