Các Ảnh hưởng của Molypden

Hiệu ứng của Molypden trên Cấu trúc
Cả hai molypden và crom là phần tử điều đó hình thức và ổn định ferrite và mở rộng ferrite pha vùng. Khả năng của molypden đến hình thức ferrite is tương đương đến đó of crom. molypden cũng thúc đẩy intermetallic pha in austenit không gỉ thép% 2c như vậy như vậy chì đến a giảm in dẻo và độ dẻo dai. In thứ tự đến duy trì a đơn austenite cấu trúc in austenit không gỉ thép% 2c hàm lượng of austenite tạo hình phần tử (niken% 2c nitơ% 2c mangan% 2c v.v.) nên cũng be tương ứng tăng với the tăng of molypden content in the steel, in order to maintain a balance between ferrite and austenite forming elements in the steel.
The Effect of 2 Molybdenum on Performance
The oxidation effect of molybdenum on austenitic stainless steel is not significant. Therefore, when chromium nickel austenitic stainless steel maintains a single austenite structure and there is no intermetallic precipitation, the addition of molybdenum has little effect on its room temperature mechanical properties. However, with the increase of molybdenum content, the high temperature strength of the steel improves greatly, such as durability and creep properties. Therefore, molybdenum containing stainless steel is often used at high temperatures. However, The addition of molybdenum increases the high-temperature deformation resistance of steel, and in addition, there is often a small amount in the steel δ Therefore, the hot workability of ferrite containing molybdenum stainless steel is worse than that of non molybdenum steel, and the higher the molybdenum content, the worse the Hot working. In addition, it is easy to occur in molybdenum containing austenitic stainless steel κ （ σ） Phase precipitation, which will significantly deteriorate the plasticity and toughness of the steel. Therefore, during the production, equipment manufacturing and application of molybdenum containing austenitic stainless steel, attention should be paid to prevent the formation of intermetallic phase in the steel. Although the reason why molybdenum acts as an alloy element resistant to the reduction medium of austenitic stainless steel, pitting corrosion and Crevice corrosion is not completely clear, a large number of experiments have pointed out that the corrosion resistance of molybdenum is only effective when it is equivalent to the high content of chromium in the steel, Molybdenum is mainly used to strengthen the corrosion resistance of chromium in steel. At the same time, the corrosion inhibition effect of molybdenum after forming acid salt has also been confirmed by experiments. In terms of stress corrosion resistance of high concentration chloride solution, although the reason why molybdenum, as an alloy element, is resistant to reducing medium of austenitic stainless steel, pitting corrosion and Crevice corrosion is not completely clear, a large number of experiments have pointed out that the role of molybdenum is only effective when the steel contains a high amount of chromium, Molybdenum mainly strengthens the corrosion resistance of chromium in steel. At the same time, the buffering effect of molybdenum after forming Molybdate has also been confirmed by experiments. Although this experiment refers to the stress corrosion resistance of high concentration chloride sinking. Molybdenum below 3 # is harmful to the stress corrosion resistance of austenitic stainless steel. However, due to the common use of chromium nickel austenitic stainless steel in water media containing trace amounts of chloride and saturated oxygen, its stress corrosion originates from point corrosion. Therefore, chromium nickel molybdenum austenitic stainless steel containing molybdenum often has better resistance to chloride stress corrosion than steel without molybdenum in practical applications due to its high resistance to point corrosion.