Martensitic stainless steel for oil casing and manufacturing method thereof
A martensitic stainless steel and manufacturing method technology, applied in manufacturing tools, heat treatment equipment, heat treatment furnaces, etc., can solve the problem of high cost and achieve the effects of high production efficiency, good hardenability and good toughness
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[0030] Table 1 shows the chemical composition of the steels A1-A8 of the examples of the present invention and the steels B1-B3 of the comparison. Among them, B1 steel does not add N, Cu and other elements, and the matrix contains more than 10% high-temperature ferrite.
[0031]The processing and manufacturing methods of the steel in the embodiment of the present invention and the reference steel are as follows: 1) smelting in a vacuum furnace, protective pouring into a round ingot, and forming by hot rolling after casting the ingot. 2) Carry out modulated heat treatment, the heat treatment quenching temperature is 950-1100°C, keep warm for 45 minutes, then take out the furnace and air cool to around room temperature; tempering temperature is 550-650°C, keep warm for 60 minutes, and air cool.
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