steel parts
1.machined parts
2.High precision
3 big size
4.forging, heat treatment, rough turning and finished turning

Certificate to provide:

Mechanical test reportHardness test reportChemical test reportHeat treatment recordMT report ( All accessible surfaces of finished products)UT reportDimensional control report

Chemical composition of the material:

C: 0.38-0.43Mn: 0.75-1.00P:  0-0.04S:  0-0.04Si:  0.15-0.35Cr:  0.80-1.10Mo:  0.15-0.25

Mechanical Property of the material:

AISI 4140 Weldless ForgingHeat treatment:  Normalized Quenched and temperedYield strength (0.2% strain): 550-760 MPaTensile Strength: 800-950 MPaElongation ( in 50 mm): 14% (min)  Hardness: 26-28 HRC