Method for improving radial structure and performance uniformity of G115 steel large-caliber thick-wall pipe
A thick-walled pipe and large-diameter technology, which is applied to improve the radial structure and performance uniformity of G115 steel large-diameter thick-walled pipes, and in the field of pipe manufacturing related to supercritical thermal power units with steam parameters of 630-650°C, can solve the problem of radial structure and performance. Uneven performance and other problems, to achieve good radial organization and performance uniformity, improve the radial temperature field, and shorten the production cycle
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[0033] Example 1
[0034] The main component weight percentages of the new 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%; P: 0.001%; S: 0.0005%; Ni: 0.01%; Al: 0.005%; Ti: 0.01%; Zr: 0.01%; the balance is Fe.
[0035] The invention smelt 40 tons of molten steel according to the above-mentioned composition EAF+LF+VD process, poured 3 steel ingots, and selected two of them for vertical hot extrusion. Both product specifications are G115 with outer diameter Φ590mm×wall thickness 90mm×length 6000mm Large-diameter thick-walled heat-resistant steel pipe. One is implemented according to the existing technology; the other is implemented according to the process of the present invention.
[0036] The existing technology is implemented as follows: the furnace is installed at a temperature of 550°C, heated to 1080°C at 130°C / h...
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