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Effects of various impurity elements on the stainless steel Business Articles | April 29, 2013 According to metal powder supplier, cobalt as an alloying element is rarely used in steel, this is because of the high price of cobalt and it has more important purposes in other respects (such as ...
According to metal powder supplier, cobalt as an alloying element is rarely used in steel Cheap Adidas Shoes , this is because of the high price of cobalt and it has more important purposes in other respects (such as high-speed steel, carbide, cobalt-based heat resistant alloy, magnetic steel or hard magnetic alloy, etc.). Cobalt is not commonly used as alloy elements in stainless steel, common stainless steel such as 9Crl7MoVCo steel (containing 1.2-1.8 % cobalt) plus cobalt was not meant to improve corrosion resistance but to improve the hardness, because the main purpose of this stainless steel is manufacturing sliced mechanical cutting tools, scissors and scalpel blades.
Boron: in high chromium ferritic stainless steel Crl7Mo2Ti add 0.005% boron powder, can improve the corrosion resistance of boiling 65% acetic acid. Plus trace amounts of boron powder (0.0006~0.0007%) can improve the thermal state ductility of the austenitic stainless steel. A small amount of boron powder because of forming low-melting crystals, make the tendency of austenitic steel produce hot cracking increased while welding, but when it contains a lot of boron powder (0.5% to 0.6%), it can prevent the generation of thermal cracks instead. Because when containing 0.5% to 0.6 % boron, it formed of austenite-borides two-phase structure, so that lower the melting point of the weld. When the molten bath?s solidification temperature is less than half-melted zone, the tensile stress of base material generated in the cooling is withstood by the liquid state, solid state weld metal#8# it would not cause cracks at this time, even near the seam zone is formed of cracks, it can also be filled by the liquid-solid metal. Chrome-nickel austenitic stainless steel containing boron has a special purpose in the atomic energy industry.
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