Even so, C28 Ball Bearing cannot be completely ignored because they also affect the performance and structure of stainless steel. influences. Silicon is an element that forms ferrite, and it is an impurity element often present in general stainless steel. Cobalt is not widely used in steel as an alloying element.

This is because of the high price of cobalt and its importance in other aspects (such as high-speed steel, hard alloy, cobalt-based heat-resistant alloy, magnetic steel or hard magnetic alloy, etc.) use. There are not many common stainless steels that add cobalt as alloying element. Commonly used stainless steels such as 9Crl7MoVCo steel (containing 1.2-1.8% cobalt) add cobalt. The purpose is not to improve corrosion resistance but to increase hardness, because the main purpose of this stainless steel It is the manufacture of slicing machine cutting tools, scissors and surgical blades.

Boron: The addition of 0.005% boron to the high-chromium ferritic stainless steel Crl7Mo2Ti steel can improve the corrosion resistance in the boiling 65% acetic acid. Adding a small amount of boron (0.0006~0.0007%) can improve the thermal plasticity of austenitic stainless steel. A small amount of boron forms a low melting point eutectic, which increases the tendency of austenitic steel to produce hot cracks during welding, but when it contains more boron (0.5 to 0.6%), it can prevent the occurrence of hot cracks. .

Because when it contains 0.5 to 0.6% of boron, austenite-boride two-phase structure is formed, which reduces the melting point of the weld. When the solidification temperature of the molten pool is lower than the semi-melting zone, the tensile stress generated by the base material during cooling will be in the liquid state.

The solid weld metal will not cause cracks at this time. Even if a crack is formed in the near-joint area, it can be filled with liquid-solid molten pool metal. The boron-containing chromium-nickel austenitic stainless steel has special applications in the atomic energy industry. Phosphorus: It is an impurity element in general stainless steel, but its hazard in austenitic stainless steel is not as significant as in general steel, so the content can be allowed to be higher, if some data suggest it can reach 0.06%. To facilitate smelting control.

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