A continuous casting near net forming preparation method of high carbon martensitic stainless steel strip
A carbon martensite and near-net forming technology, applied in the field of steel alloy materials, can solve the problems of difficulty in hot working preparation, difficulty in preparing thin-gauge products, element segregation, etc. Surface quality problems, the effect of improving yield
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Embodiment 1
[0030] Process such as figure 1 shown;
[0031] Prepare raw materials according to the set composition, add electrolytic chromium, molybdenum, nickel, vanadium iron, T10 carbon steel and pure iron in the melting furnace, and heat under the protection of argon atmosphere until all the materials are melted, then add electrolytic manganese alloy , melted into molten steel, its composition by mass percentage is C 0.5%, Cr 15%, Mn 0.7%, Mo 0.5%, Ni 0.4%, V 0.2%, Si 1.0%, and the balance is iron and unavoidable impurities; The melting temperature is 1550°C;
[0032] The molten steel is poured into the tundish, and flows into the cavity between the two counter-rotating crystallization rollers and the side sealing plate through the tundish. The molten steel is led out with the rotation of the crystallization rollers to form a casting belt. The rotation speed of the crystallization rollers is controlled at 25m / min, the cast strip is water-cooled to room temperature after it comes ou...
Embodiment 2
[0036] Method is with embodiment 1, and difference is:
[0037](1) The composition of molten steel contains C 0.7%, Cr 17%, Mn 0.6%, Mo 0.5%, Ni 0.8%, V0.1%, Si 1.5% by mass percentage; melting temperature is 1580°C;
[0038] (2) The rotation speed of the crystallization roller during continuous casting is 30m / min, the thickness of the casting belt is 3.5mm, and the width is 100mm;
[0039] (3) Heat the water-cooled cast strip at 1100°C for 3 minutes, then carry out 2 passes of hot rolling, the starting temperature is 1100°C, the total reduction ratio of hot rolling is 40%, the final rolling temperature is 1000°C, and water-cooled to 200°C after hot rolling Below ℃, a hot-rolled thin strip with a thickness of 2.1mm is obtained;
[0040] (4) The hot-rolled thin strip is kept at 1050°C for 20min, and then tempered at 550°C for 2h after water cooling; the high-carbon martensitic stainless steel thin strip has a yield strength of 600MPa, a tensile strength of 800MPa, an elongatio...
Embodiment 3
[0042] Method is with embodiment 1, and difference is:
[0043] (1) The composition of molten steel contains 0.4% of C, 14% of Cr, 1.5% of Mn, 0.7% of Mo, 1.0% of Ni, 0.3% of V, and 1.0% of Si according to the mass percentage; the melting temperature is 1560°C;
[0044] (2) The rotation speed of the crystallization roller during continuous casting is 30m / min, the thickness of the casting strip is 4.0mm, and the width is 100mm;
[0045] (3) Heat the water-cooled cast strip at 1100°C for 5 minutes, and then carry out 2 passes of hot rolling, the starting temperature is 1100°C, the total reduction ratio of hot rolling is 40%, the final rolling temperature is 1000°C, and water-cooled to 200°C after hot rolling Below ℃, a hot-rolled thin strip with a thickness of 2.4mm is obtained;
[0046] (4) The hot-rolled strip is kept at 1000°C for 20min, and then tempered at 500°C for 2h after water cooling; the yield strength of the high-carbon martensitic stainless steel strip is 530MPa, t...
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