37Mn5 Petroleum steel

Execution standard YB/T5222-2004; Q/TGGK01-2004; hot rolling tube according to APISPEC5CT.

Typical grade or steel grade J55, K55, N80 and so on.

Specification size: Φ160mm, Φ180mm, Φ200mm

Chemical Composition of 37Mn5 Steel Pipe

C: 0.34-0.39
Si: 0.20-0.35
Mn: 1.25-1.50
P:≤0.025
S: ≤0.015
Cr: ≤0.15
Ni: ≤0.20
Cu: ≤0.20 

The difference use between 37Mn5 and 45 steel:

The 37Mn5 steel pipe is a J55 steel pipe, which is commonly used for oil well drilling and it is also as a raw material for rolling anchors.

45 steel is a high-quality carbon structural steel, which is the most commonly used medium carbon quenched and tempered steel. 45 steel has good comprehensive mechanical properties, low hardenability and easy cracking during water quenching. Small parts should be treated with quenching and tempering, and large parts should be normalized. 45 steel is mainly used to manufacture high-strength moving parts, such as turbine impellers and compressor pistons, Shafts, gears, racks, worms, etc. Welded parts are preheated before welding and stress relief after welding.