Manufacturing method of 700MPa grade F/B high strength band steel
A manufacturing method and technology of high-strength steel, applied in manufacturing tools, metal rolling, contour control, etc., can solve the problems of difficult steel smelting, increase steel cost, etc., and achieve the goal of reducing yield ratio, increasing strength, and reducing production costs Effect
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example 1
[0013] Example 1: The chemical composition of the selected high-strength strip steel, the weight percent ratio is: C0.12%, Si0.10%, Mn2.20%, Ti0.15%, P0.003%, S0.008%, and the rest are Iron Fe, the steel is smelted on a 200-ton converter, and continuously cast into a continuous casting slab of 250mm×1300mm×10020mm, the continuous casting slab is heated to 1200°C, rolled on a 2050 hot continuous rolling mill, and the rough rolling start temperature is controlled 1150°C, the temperature of the rough rolling and finish rolling is controlled at 1050°C, the rough rolling is 2 passes, the thickness of the intermediate billet is 40mm, after that, the intermediate billet is finished rolling, the temperature of the start rolling of the finish rolling is controlled at 1000°C, and the temperature of the finish rolling is controlled at 1000°C. 850°C, 5 passes of finishing rolling, water cooling between finishing mills;
[0014] The billet after rolling was cooled, the cooling rate was 30°...
example 2
[0015] Example 2: The chemical composition of the selected high-strength strip steel, the weight percent ratio is: C0.18%, Si0.10%, Mn1.60%, Ti0.22%, P0.003%, S0.007%, and the rest are Iron Fe: 1 pass of rough rolling, the billet thickness after rough rolling is 45mm, the temperature of start rolling of finish rolling is controlled at 970°C, the temperature of finish rolling is controlled at 806°C, the temperature of finish rolling is controlled at 806°C, finish rolling is 7 passes, cooling after rolling, the cooling rate is 50°C / s, coiling temperature is 550°C. Other technological processes and technological conditions are the same as example 1. Finally, a high-strength strip steel product is obtained, with a thickness of 8mm, and the mechanical property test result is: σ s 800MPa, σ b 895MPa, δ 5 20%, akv 130J / mm 2 , Cold bending, B=35, d=0.5a, qualified.
example 3
[0016] Example 3: The chemical composition of the selected high-strength strip steel, the weight percent ratio is: C0.158%, Si0.10%, Mn1.74%, Ti0.18%, P0.003%, S0.008%, and the rest are Iron Fe; 3 passes of rough rolling, the billet thickness after rough rolling is 32mm, the start rolling temperature of finish rolling is 950°C, the finish rolling temperature is 790°C, 5 passes of finish rolling; cooling after rolling, the cooling rate is 40°C / s, the coiling temperature is 450°C. Other technological processes and process conditions are all identical with example 1. Finally, a high-strength strip steel product is obtained, with a thickness of 5mm, and the mechanical property test result is: σ s 790MPa, σ b 885MPa, δ 5 20%, akv 134J / mm 2 , Cold bending, B=35, d=0.5a, qualified.
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Abstract
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