Materials

303 is a free-machining stainless steel containing sulfur and selenium, which enhances the cutting performance and resistance to high-temperature galling. The 303 stainless steel is an Austenitic free-machining, wear-resistant, and acid-resistant steel. To improve the properties of this steel, up to 0.60% molybdenum can be added. It is resistant to erosion and has excellent cutting properties, as well as resistance to burn and corrosion. After stress-relieving heat treatment, the mechanical properties of 303 stainless steel are: tensile strength 515MPa, yield strength 205MPa, elongation 40%. The standard hardness of stainless steel 303 is HRB 90-100, HRC 20-25. Note: HRB100 = HRC20

Application Scenario

For applications requiring high machinability and surface finish, *suited for automatic lathe processing of bolts and nuts.

Chemical Composition (%)

C :≤0.15

Si :≤1.00

Mn :≤2.00

P :≤0.20

S :≥0.15

Cr :17.00-19.00

Ni :8.00-10.00[1]