Features and Scope:
Strength steel is slightly higher than 15, rarely quenching, no temper brittleness. Cold plastic deformation of high, usually for bending, rolling, bending and hammer arch side processing, and contact welding arc welding performance is good, when welding thin, form-critical or complex shape of the workpiece on the crack-prone. Machinability drawn or annealed state than normalizing condition is good, generally used in the manufacture Shouli Bu large and require high toughness.

Chemical composition: Carbon C: 0.17 ~ 0.24 " ,Si Si: 0.17 ~ 0.37 ,Manganese Mn: 0.35 ~ 0.65 ,S S: ≤ 0.035 ,P P: ≤ 0.035 ,Chromium Cr: ≤ 0.25 ,Ni-Ni: ≤ 0.25 ,Copper Cu: ≤ 0.25