1. Ferritic stainless steel ste窗鄉m: 12% to 30% chromium. Its corrosion玩吃 resistance, toughness and weldabil輛錢ity increase with the increase o對可f chromium content, and i作姐ts resistance to chloride鐘懂 stress corrosion is better than other輛員 types of stainless 她女steel valve stems.
2. Austenitic stainless stee拍錯l valve stem: contains more than 1習動8% chromium, and als來呢o contains about 8% nickel河們 and a small amount 吧愛of molybdenum, titanium, nitrogen a會票nd other elements. It has go身服od comprehensive performance and is re錯城sistant to corrosion by vari嗎人ous media.
3. Austenitic-ferritic duplex stainles舊媽s steel stem: It has the advanta海老ges of both austenitic and ferritic 南弟stainless steel ball stems, and has 鄉光superplasticity.
4. Martensitic stain費技less steel stem: high strength, but po和做or plasticity and weldability.
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