24-30% Mn-containing alloy pipe material and manufacture method thereof
A manufacturing method and technology for alloy pipes, which are used in manufacturing tools, temperature control, heat treatment equipment, etc., can solve problems such as high insecurity and reduced plasticity, and achieve low yield ratio, high plasticity, and good corrosion resistance. Effect
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Embodiment 1
[0022]Alloy composition: C=0.003%, Mn=27.1%, Si=3.2%, Al=2.8%, P=0.008, S=0.005, N=0.008%, Ti: 0.03%, the rest Fe.
[0023] Manufacturing process: smelting and casting under vacuum conditions, the ingot is subjected to homogenization annealing at 1200°C±20°C for 3 hours, the steel ingot is made into a steel plate after hot rolling, the rolling is started at 1180°C, and the final rolling temperature is 890°C; through the straight seam resistance Welded tube into tube blank. The steel pipe with complete austenitic structure is obtained after the tube blank is solution treated at 1180°C±20°C, and the expandable pipe is made after aging treatment at 350-400°C for 450-550s. Main properties: Yield strength 260MPa, tensile strength 650MPa, yield strength ratio 0.40, uniform elongation 80%, elongation after fracture 95%. After 40% expansion and deformation, the yield strength is 505MPa, the tensile strength is 680MPa, the yield ratio is 0.74, the uniform elongation is 36.3%, and the ...
Embodiment 2
[0025] Alloy composition: C=0.08%, Mn=24.6%, Si=1.9%, Al=1.65%, P=0.008, S=0.003, N=0.007%, Nb=0.06%, Cr=4.3%, Cu=0.2% , the rest Fe.
[0026] Manufacturing process: smelting and casting under vacuum conditions, homogenizing annealing for 4 hours at 1200°C±20°C for ingots, and hot rolling the ingots to make seamless pipe billets. The steel pipe with complete austenite structure is obtained after the tube blank is solution treated at 1170°C±20°C, and the expandable pipe is made after aging treatment at 380-430°C for 420-470s.
[0027] Main properties: Yield strength 360MPa, tensile strength 780MPa, yield strength ratio 0.46, uniform elongation 68.0%, elongation after fracture 75.3%. After 35% expansion and deformation, the yield strength is 556MPa, the tensile strength is 814MPa, the yield strength ratio is 0.68, the uniform elongation is 30.1%, and the total elongation is 38.4%. After expansion and deformation, the mechanical properties meet the performance requirements of A...
Embodiment 3
[0029] Alloy composition: C=0.32%, Mn=24.4%, Si=0.5%, Al=1.5%, P=0.007, S=0.004, N=0.008%, Cr=3.3%, Cu=0.4%, V=0.05% , the rest Fe.
[0030] Manufacturing process: smelting and casting under vacuum conditions, homogenizing annealing for 4 hours at 1180°C±20°C for ingots, and hot rolling the ingots to make seamless pipe billets. The steel pipe with complete austenitic structure is obtained after the tube blank is solution treated at 1160°C±20°C, and the expandable pipe is made after aging treatment at 400-450°C for 400-450s.
[0031] Main properties: Yield strength 382MPa, tensile strength 825MPa, yield ratio 0.46, uniform elongation 64.5%, elongation after fracture 81.3%. After 30% expansion and deformation, the yield strength is 628MPa, the tensile strength is 860MPa, the yield ratio is 0.73, the uniform elongation is 29.3%, and the total elongation is 49.2%. After expansion and deformation, the mechanical properties meet the performance requirements of API 90ksi steel grad...
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