Corrosion resistance:
Both have rust and corrosion resistance. With the increase of the amount of Cr, it is resistant to oxidizing acid corrosion such as nitric acid and high temperature oxidation resistance, and the vulcanization performance is improved. As the amount of Ni increases, the resistance to chloride stress corrosion resistance and the resistance to reducing acid increase. As the amount of C decreases, or the stabilizing element is added, the intergranular corrosion resistance of the steel is improved. With the increase of the amount of Mo, the steel is resistant to reducing acid and pitting corrosion, and the crevice corrosion performance is increased. The steel contains Cu, especially Mo and Cu composite, and the sulfuric acid resistance of the steel is obviously improved. When it contains Si~4%, it can resist the corrosion of fuming nitric acid. It can reduce the content of impurity elements C, Si, P, Ti, etc. in some steels, and can be used as nitric acid grade and urea grade stainless steel.
Mechanical and physical properties:
They all have a good combination of strong-toughness and plasticity, and have excellent low temperature toughness 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 that of carbon). With the increase of cold deformation, the strength of steel increases the strength of steel with N in steel. increase. Cr-Mn austenitic stainless steel is about 30% stronger than Cr-Ni austenitic steel due to the strengthening effect of Mn and N addition, and the plastic and toughness are still good. Most of these steels are non-magnetic and can be used as non-magnetic steel.
Martensitic stainless steel
Corrosion resistance:
Martensite chromium stainless steel has rust resistance and resistance to weak medium corrosion. As the amount of Cr increases, the corrosion resistance of Mo increases, and as the content of C increases, the corrosion resistance decreases, and with the increase of hardness, the resistance to hydrogen sulfide stress corrosion improve. Martensite chrome-nickel stainless steel has a non-rust property, and when it contains 17% Cr, the corrosion resistance is similar to or slightly lower than 18-8.
Mechanical and physical properties:
The martensitic chromium stainless steel increases with the amount of C. The strength and hardness of the steel increase, up to RC60. The wear resistance of the steel is good, but the toughness is poor. When Mo and V are contained, the strength of the steel is increased. When a small amount of Ni is contained, the strength-toughness of the steel is well matched. Such steels have brittle transition temperatures, are magnetic, have low density, are good in shock resistance, and have a slightly lower modulus of elasticity than carbon steel. Martensitic chrome-nickel stainless steel has high strength (ós not less than 9800 MPa) and high hardness (RC not less than 36) and has a high strength/weight ratio.
Application of materials in stainless steel bearings:
SUS304, SUS316, SUS316L: inner and outer rings in austenitic stainless steel bearings, balls, cages, rivets, bearing seats, top wires, dust caps, seal ring skeleton. The cage in the martensitic stainless steel bearing, rivet, bearing seat, top wire, dust cover, seal ring skeleton.
SUS440C, SUS440B: inner and outer rings in martensitic stainless steel bearings, balls.
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