Engineering heat treatment method of ultrahigh-strength steel for compressor impeller
An ultra-high-strength steel, compressor impeller technology, applied in metal processing equipment and other directions, can solve the problems of not meeting the strength requirements of the impeller, unable to meet the needs of large-scale compressor civil engineering, etc., to achieve high strength, good plasticity and toughness, improve The effect of stability
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Embodiment 1
[0024] In terms of weight percentage, the chemical composition is C: 0.025%, Cr: 12.0%, Ni: 11.0%, Mo: 1.25%, Ti: 1.5%, Nb: 0.3%, V: 0.4%, Al: 0.3%, Cu : 0.4%, Mn: 0.4%, Si: 0.2%, S: 0.01%, P: 0.02%, and the balance is Fe and unavoidable impurities. The raw materials are smelted and poured, and then the obtained slab is forged at 1200℃ to obtain Sheets with dimensions 250×130×60mm.
[0025] Raise the temperature of the plate to 980-1030°C at a rate of 70-80°C / h at a furnace entry temperature of 300-400°C, and then oil-cool it to 300-400°C after holding for 2 hours. Then, at the furnace temperature of 150-200°C, the temperature is raised to 550-580°C at a rate of 50-60°C / h, kept for 2 hours, and then air-cooled to room temperature. At this time, the mechanical properties of the plates are shown in Table 1.
[0026] Table 1
[0027]
[0028] It can be seen from Table 1 that the ductile and plastic properties such as tensile strength, elongation, reduction of area, and impa...
Embodiment 2
[0030] In terms of weight percentage, the chemical composition is C: 0.03%, Cr: 11.0%, Ni: 10.5%, Mo: 1.0%, Ti: 0.9%, Nb: 0.1%, V: 0.2%, Al: 0.1%, Cu : 0.5%, Mn: 0.5%, Si: 0.3%, S: 0.01%, P: 0.02%, and the balance is Fe and unavoidable impurities for smelting and casting, and then forging the obtained slab at 850°C A panel with dimensions 250 x 130 x 60 mm was obtained.
[0031] The plate is heated to 950-1000°C at a rate of 90-100°C / h at a furnace entry temperature of 400-500°C, and oil-cooled to 400-500°C after holding for 1.5 hours. Then, at the furnace temperature of 100-200°C, the temperature is raised to 580-600°C at a rate of 60-70°C / h, kept for 2 hours, and then air-cooled to room temperature. The mechanical properties of the plates at this time are shown in Table 2.
[0032] Table 2
[0033]
[0034] It can be seen from Table 2 that the ductile and plastic properties such as tensile strength, elongation, reduction of area, and impact energy after heat treatment of...
Embodiment 3
[0036] In terms of weight percentage, the chemical composition is C: 0.03%, Cr: 11.5%, Ni: 10.8%, Mo: 1.2%, Ti: 1.0%, Nb: 0.2%, V: 0.3%, Al: 0.2%, Cu : 0.45%, Mn: 0.45%, Si: 0.2%, S: 0.01%, P: 0.01%, and the balance is Fe and unavoidable impurities. The raw materials are smelted and poured, and then the obtained slab is forged at 1100°C to obtain Sheets with dimensions 250×130×60mm.
[0037] At the furnace temperature of 450-500°C, the plate is heated to 1000-1050°C at a rate of 70-80°C / h, and oil-cooled to 400-450°C after holding for 2 hours. Then, at the furnace temperature of 100-200°C, the temperature is raised to 560-590°C at a rate of 50-60°C / h, kept for 2 hours, and then air-cooled to room temperature. The mechanical properties of the plates at this time are shown in Table 3.
[0038] table 3
[0039]
[0040] It can be seen from Table 3 that the ductile and plastic properties such as tensile strength, elongation, reduction of area, and impact energy after heat tr...
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