Method for improving radial structure uniformity of martensite heat-resistant steel large-caliber thick-wall pipe
A technology for uniform structure and heat-resistant steel, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve problems such as radial structure and performance inhomogeneity, improve radial temperature field, improve uniformity, and eliminate tissue inheritance sexual effect
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[0038] The main components of the novel martensitic heat-resistant steel (G115) in the embodiment of the present invention are (wt.%): C: 0.080%; Cr: 8.99%; Si: 0.30%; Mn: 0.50%; Co: 3.01%; W: 2.81%; V: 0.21%; Nb: 0.53%; N: 0.008%; B: 0.014%; Cu: 0.8%; Ti: 0.01%; Zr: 0.01%; the balance is Fe.
[0039] The present invention smelts 40 tons of molten steel according to the above-mentioned composition EAF+LF+VD process, casts 3 steel ingots, and selects two of them for vertical hot extrusion. Large-diameter thick-walled heat-resistant steel pipe. One is implemented by the prior art; the other is implemented by the process of the present invention.
[0040] The implementation of the existing technology is as follows: the temperature of the furnace is 550 ° C, and after the penetration is heated to 1080 ° C at 130 ° C / h, the penetration time is 2 hours, and then the temperature is kept for 1 hour, and the water is quickly quenched to room temperature after the furnace; Fire tre...
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