Austenitic stainless steel

Corrosion resistance: both have rust resistance and corrosion resistance. With the increase of Cr content, the resistance to nitric acid and other oxidizing acid corrosion and high temperature oxidation resistance, and the vulcanization performance are improved. With the increase of Ni content, the chloride stress corrosion resistance and reducing acid resistance increase. The intergranular corrosion resistance of steel is improved with the reduction of C content or the addition of stabilizing elements. With the increase of Mo content, the reducing acid resistance, pitting resistance and crevice corrosion resistance of steel increase. The steel containing Cu, especially Mo and Cu composite, has significantly improved its sulfuric acid resistance, and can resist fuming nitric acid corrosion when it contains Si~4%. Reduce the content of impurity elements C, Si, P, Ti, etc. in some steels, which can be used as nitric acid grade and urea grade stainless steel.

Mechanical and physical properties: both have a good combination of strength, toughness and plasticity. The low-temperature toughness is excellent, and can be used as low-temperature steel. With the decrease of C content in steel, the strength of steel decreases slightly (generally, low carbon steel is 29.4~49MPa lower than the higher carbon steel). With the increase of cold deformation, the strength and elasticity of steel increase. When the steel contains N, the strength of steel increases. Due to the strengthening effect of Mn and N, the strength of Cr-Mn austenitic stainless steel is about 30% higher than that of Cr-Ni austenitic steel, and its plasticity and toughness are still good. This kind of steel is mostly non-magnetic, so it can be used as non-magnetic steel.

Martensitic stainless steel

Corrosion resistance: martensitic chromium stainless steel has rust resistance and weak medium corrosion resistance. With the increase of Cr content, the corrosion resistance increases with the addition of Mo. With the increase of C content, the corrosion resistance decreases. With the increase of hardness, the sensitivity of hydrogen sulfide stress corrosion resistance increases. Martensitic Cr-Ni stainless steel has rust resistance. When the content of Cr17%, the corrosion resistance is similar to or slightly lower than 18-8.

Mechanical and physical properties: with the increase of C content, the strength and hardness of martensitic chromium stainless steel increase, and the maximum can reach more than RC60. The steel has good wear resistance, but poor toughness. With Mo and V, the strength of steel increases. When a small amount of Ni is contained, the steel has a good combination of strength and toughness. This kind of steel has brittle transition temperature, magnetism, low density, good seismic resistance, and slightly lower elastic modulus than carbon steel. Martensitic chromium-nickel stainless steel has high strength (ó s not less than 9800MPa) and high hardness (RC not less than 36), and has high strength/weight ratio.

Application of materials in stainless steel bearings: SUS304, SUS316, SUS316L: inner and outer rings, balls, cages, rivets, bearing seats, jackscrews, dust covers, sealing ring framework in austenitic stainless steel bearings. Cage, rivet, bearing seat, top screw, dust cover, seal ring framework in martensitic stainless steel bearing.

SUS440C, SUS440B: inner and outer rings and balls in martensitic stainless steel bearings.