Alloy steel and manufacture method thereof
A manufacturing method and alloy steel technology, which are applied to the alloy steel of high pressure boilers and its manufacturing field, can solve the problems of reducing impact resistance, steel failure, and increasing the aging of steel, and achieve low Al content and reduce aging. Effect
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example 1
[0081] Add 140 tons of molten iron into a converter with a nominal capacity of 120 tons (the actual tapping capacity is 125 to 135 tons), and use the function of oxygen blowing and decarburization of the converter to initially smelt the molten iron into molten steel. When the molten steel is initially smelted to a C content of 0.03%, a P content of 0.011%, a S content of 0.010%, a Si content of 0.02%, a Mn content of 0.03%, a Cr content of 0.05%, and a Mo content of 0.03%, it begins to Ladle tapping. The amount of molten steel after converter smelting is 133 tons.
[0082] In the tapping process, add 350kg of FeAl (aluminum content is 40%, the rest is Fe) that can remove the oxygen content of molten steel to below 0.0020%, and FeSi (Si content is 73%, the rest is Fe) 500kg, Metal Mn (Mn content is 98%) 660kg, low carbon ferrochrome (Cr content is 66%) 1670kg and molybdenum iron (Mo content is 59%) 875kg. After the addition, the actual oxygen content of the molten steel measu...
example 2
[0087] Add 140 tons of molten iron into a converter with a nominal capacity of 120 tons (the actual tapping capacity is 125 to 135 tons), and use the function of oxygen blowing and decarburization of the converter to initially smelt the molten iron into molten steel. When molten steel is initially smelted to a C content of 0.04%, a P content of 0.014%, a S content of 0.019%, a Si content of 0.02%, a Mn content of 0.04%, a Cr content of 0.05%, and a Mo content of 0.04%, it begins to Ladle tapping. The amount of molten steel after converter smelting is 133 tons.
[0088] During the tapping process, add 320kg of FeAl (aluminum content is 40%, the rest is Fe) and FeSi (Si content is 73%, the rest is Fe) 390kg, which can remove the oxygen content of molten steel to below 0.0020% Metal Mn (Mn content is 98%) 940kg, low carbon ferrochrome (Cr content is 66%) 1800kg and molybdenum iron (Mo content is 59%) 920kg. After the addition, the actual oxygen content of the molten steel measu...
example 3
[0093] Add 135 tons of molten iron into a converter with a nominal capacity of 120 tons (the actual tapping amount is 125 to 135 tons), and use the function of oxygen blowing and decarburization of the converter to initially smelt the molten iron into molten steel. When the molten steel is initially smelted to a C content of 0.06%, a P content of 0.010%, a S content of 0.008%, a Si content of 0.02%, a Mn content of 0.05%, a Cr content of 0.05%, and a Mo content of 0.04%. Ladle tapping. The amount of molten steel after converter smelting is 128 tons.
[0094] During the tapping process, 350 kg of FeAl (aluminum content of 40%, the remainder being Fe), 720 kg of FeSi (Si content of 73%, and the remainder being Fe), which can remove the oxygen content of molten steel to below 0.0020%, are added to the ladle. Metal Mn (Mn content is 98%) 720kg, low carbon ferrochrome (Cr content is 66%) 2000kg and molybdenum iron (Mo content is 59%) 830kg. After the addition, the actual oxygen c...
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