The main characteristics of stainless steel
Usage of different welding performance requirements are also different . A general class of cutlery on the welding performance is not required , even including some pot enterprises . But most products require materials welding performance is good, like second-class cutlery , mug , steel , water heaters, drinking fountains , etc.
The vast majority of stainless steel products require good corrosion resistance , like a second class tableware, kitchen utensils , water heaters , drinking fountains , and some foreign businessmen corrosion products also do test: NACL solution heated to boiling , pour some time after solution off , washed dried and weigh loss , to determine the degree of corrosion ( NOTE : the product is polished by sandpaper or emery cloth containing Fe component , the surface can cause rust test )
Today’s society is generally in the production of stainless steel products are polished in this process , only a few products such as water heaters, drinking fountains , etc. does not require polishing liner . Therefore, the performance of which requires a good polishing materials . The main factors affecting the polishing performance are the following :
① raw surface defects. Such as scratches , pitting , excessive pickling .
② raw material problem. Hardness is too low, it is not easy to throw light (BQ is bad ) when polished , and the hardness is too low , in the deep stretch prone to orange peel surface , thus affecting BQ sex . BQ relatively high hardness like .
③ After deep drawing of products , the deformation of the surface area will be a great little black dots and RIDGING, thus affecting BQ sex .
Refers to a high temperature heat resistance of stainless steel can maintain its excellent mechanical properties.
The impact of carbon : carbon in austenitic stainless steel is a strong and stable. Austenite and expanded set of elements austenite . The ability of carbon to austenite is about 30 times of nickel , carbon, is an interstitial element , solid solution strengthening can significantly improve the strength of austenitic stainless steel . Carbon can also improve the performance of austenitic stainless steel in a high concentration of chloride (e.g., boiling 42% MgCl2 solution) resistance to stress corrosion .
When the number of atoms of chromium content in the steel is not less than 12.5% , the electrode potential of steel can be mutated , by the negative potential of the positive electrode potential rises . Prevent galvanic corrosion .
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