The major attribute of stainless steel material

Stainless steel material major attribute
Stainless steel (StainlessSteel) it is not to become rusty the abbreviation of acid-proof steel, be able to bear or endure air, vapour, water corrode medium infirmly or have do not become rusty sexual steel is planted call stainless steel; And will be able to bear or endure chemical medium is corroded (the chemical dip corrode such as acerbity, alkaline, salt) steel is planted call acid-proof steel. As a result of both make in the difference on chemical composition their be able to bear or endure corrode sex is different, common stainless steel is not able to bear or endure commonly chemical medium is corroded, and acid-proof steel all is had commonly do not become rusty quality. Weldability


Of product use different to soldering the requirement of function also each are not identical. A kind of tableware can not make a demand commonly to weldability, include partial boiler even kind enterprise. But it is good that great majority product needs raw material weldability, like 2 kinds of tableware, vacuum cup, steel tube, water heater, water machine.
Corrosion resistance
When the chromium in steel quantity atomicity is measured not under 12.5% when, can make the electrode potential of steel produces mutation, rise by negative potential electrode potential. Prevent electrochemistry to corrode.
Goods of great majority stainless steel asks corrosion resistance can be good, picture one, 2 kinds of tableware, kitchen utensils and appliances, water heater, water machine, some abroad businessman still does corrosion resistance to be able to experiment to the product: Add with NACL aqueous solution lukewarm to boiling, solution is dropped after period of time, abluent drying, call weight the loss, will suffer certainly corrode degree (attention: When product polish, because the part of Fe is contained in emery cloth or sand paper, occurrence rusty spot of the surface when can bringing about a test)
Polishing function
Goods of current society stainless steel passes polishing commonly when production this one working procedure, only a few goods is like water heater, water the bravery inside machine do not need polish. Accordingly this asks the polishing function of raw material is very good. The factor that affects polishing performance basically has the following:
Blemish of surface of ① raw material. If cut, hemp is nodded, cross pickling to wait.
Material of ② raw material is inscribed questioningly. Hardness is too low, when polishing cast not easily bright (BQ sex is bad) , and hardness is too low, in the surface when cupping is extended phenomenon of skin of easy occurrence orange, affect BQ sex thereby. The BQ sex with tall hardness is opposite good.
③ passes the product of difficult stretch, surface of deflection huge area also can give small macula and RIDGING, affect BQ sex thereby.
Heat-resisting function
Heat-resisting function is to show the stainless steel below high temperature still can maintain its good physics machine function.
Carbolic influence: Carbon is to be formed strongly in austenite stainless steel firm. Decide austenite and the element that enlarges austenite area. Carbon forms the ability of austenite to be 30 times of nickel about, carbon is element of a kind of clearance, through solid dissolve aggrandizement can increase the strength of austenite stainless steel significantly. Carbon still can raise austenite stainless steel to be in tall thick chloride (like 42%MgCl2 boiling solution) be able to bear or endure mediumly stress is anticorrosive function.
But, in austenite stainless steel, carbon often is regarded as harmful element, because be in,this basically is of stainless steel be able to bear or endure below a few conditions in corrode utility (solder for instance or heat via 450~850 ℃ ) , carbon can form compound of Gao Ge's Cr23C6 carbon to cause the dilution of local chromium thereby with the chromium in steel, make of steel be able to bear or endure corrode sex is able to bear or endure especially function is corroded to drop between brilliant. Accordingly. Since 60 time the stainless steel of chromic nickel austenite of new development is carbolic content is less than mostly 0.03% or 0.02% exceed low carbon model, can know to be reduced as carbolic content, sensitivity is corroded to reduce between the brilliant of steel, have the most apparent effect under 0.02% ability when carbolic content, bead light still points out a few experiments, carbon still can increase the spot corrosion of chromic austenite stainless steel to divide the tendency. As a result of ill effect of carbon, pass in smelt of austenite stainless steel not only demand control should be pressed in mixing as far as possible low carbolic content, and in subsequently heat, also be in in the process such as cold working and heat treatment prevent carburet of stainless steel surface, and the carbide separate out that avoids chromium.