Stainless Steel Bearing Material Performance Table

Stainless Steel Bearing Material Performance Table

In special applications, ordinary bearing steel cannot meet the requirements. You can choose the corresponding type of stainless steel bearings according to different working conditions. The materials commonly used by our company to make stainless steel bearings are AISISUS304, AISI SUS316, AISI SUS316L, AISI SUS440C, AISI SUS440B, etc. Among them, the martensitic stainless steel AISI SUS440C is used as the standard material of our company's stainless steel bearings, which is suitable for medium speed and high load use. As a special order, austenitic stainless steel bearings (304 or 316, 316L) are also provided. Because of their non-hardenability, they are only suitable for low-speed and light-load applications.

Austenitic Stainless Steel

Corrosion Resistance:

Both have rust resistance and corrosion resistance. As the amount of Cr increases, resistance to oxidizing acid corrosion such as nitric acid, high temperature oxidation resistance, and vulcanization performance improve. As the amount of Ni increases, the resistance to chloride stress corrosion and the resistance to reducing acids increase. As the amount of C decreases, or stabilizing elements are added, the intergranular corrosion resistance of steel is improved. As the amount of Mo increases, the steel's resistance to reducing acids, pitting corrosion, and crevice corrosion increases. The steel contains Cu, especially Mo and Cu compound, and the sulfuric acid resistance of steel has been significantly improved. When it contains Si~4%, it can resist fuming nitric acid corrosion. 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:

All have a good combination of strength-toughness-plasticity, excellent low-temperature toughness, and can be used as low-temperature steel. As the amount of C in steel decreases, the strength of steel decreases slightly (generally low-carbon steel is 29.4~49MPa lower than the one with higher carbon). As the amount of cold deformation increases, the strength and elasticity of steel increase when steel contains N, the strength of steel increase. The strength of Cr-Mn austenitic stainless steel is about 30% higher than that of Cr-Ni austenitic steel due to the strengthening effect of Mn and N addition, and its plasticity and toughness are still good. This type of steel is mostly non-magnetic, so it can be used as a non-magnetic steel.

Martensitic Stainless Steel

Corrosion Resistance:

Martensitic chromium stainless steel has rust resistance and resistance to weak media corrosion. With the increase of Cr content, the corrosion resistance of Mo increases. With the increase of C content, the corrosion resistance decreases. With the increase of hardness, it is resistant to hydrogen sulfide stress corrosion sensitivity. improve. The martensitic chromium-nickel stainless steel has rust resistance, and when it contains 17% Cr, the corrosion resistance is similar to or slightly lower than that of 18-8.

Mechanical And Physical Properties:

Martensitic chromium stainless steel increases with the C content, the strength and hardness of the steel increases, up to RC60 or more, the steel has good wear resistance, but poor toughness. When Mo and V are contained, the strength of steel is improved. When a small amount of Ni is contained, the strength-toughness of the steel is coordinated well. This type of steel has a brittle transition temperature, is magnetic, has low density, good shock resistance, and has a slightly lower modulus of elasticity than carbon steel. Martensitic chromium-nickel stainless steel has high strength (ós not less than 9800MPa) 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, balls, cages, rivets, bearing seats, jacks, dust caps, seal ring skeletons in austenitic stainless steel bearings. The cage rivet, bearing seat, top wire, dust cover, seal ring skeleton in martensitic stainless steel bearing. To
SUS440C, SUS440B: Inner and outer rings and balls in martensitic stainless steel.

The following table lists the comparison table of commonly used stainless steel grades:

Austenite type

Martensite