Method for producing low-carbon bainite steel with optimized texture and performance
A carbon bainitic steel, production method technology, applied in the direction of rolling mill control device, metal rolling, manufacturing tools, etc., can solve the problem of high yield strength, tensile strength and yield ratio, difficult composition design and rolling process To achieve the perfect combination, the impact power does not meet the requirements and other problems, to achieve the effect of saving costs
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Embodiment 1
[0027] The chemical composition of the low carbon bainitic steel of this example is as follows. C: 0.062%, Si: 0.30%, Mn: 1.64%, P: ≤0.02%, S: ≤0.003%, Nb: 0.042%, Ti: 0.012%, B: 0.0011%, Al (full): 0.048%, Al (acid soluble): 0.043%, Cr: 0.24%, Mo: 0.10%. The rest is Fe and unavoidable impurities. The low-carbon bainite steel designed according to this composition is subjected to the following steps:
[0028] 1) Smelting: Vacuum induction furnace is used for smelting, and the chemical composition is adjusted to reach the above range;
[0029] 2) Hot rolling the low-carbon bainitic steel ingot with adjusted chemical composition, and raising the temperature to 1200°C at a rate of 10°C / s on the GLEEBLE-3800 thermal simulation test machine to ensure that a considerable amount of Nb is solid-dissolved to In austenite, it is conducive to the formation of bainite, and keep warm for 8 minutes;
[0030] 3) Perform two-stage controlled rolling on the sample after holding at 1200°C f...
Embodiment 2
[0034] The chemical composition of the low carbon bainitic steel of this example is as follows. C: 0.042%, Si: 0.15%, Mn: 1.50%, P: ≤0.02%, S: ≤0.003%, Nb: 0.051%, Ti: 0.014%, B: 0.0008%, Al (full): 0.038%, Al (acid soluble): 0.0332%, Mo: 0.19%. The rest is Fe and unavoidable impurities. The low-carbon bainite steel designed according to this composition is subjected to the following steps:
[0035] 1) smelting: adopt vacuum induction furnace smelting, adjust chemical composition to reach within the scope of the present invention;
[0036] 2) Hot rolling the low-carbon bainitic steel ingot with adjusted chemical composition, and raising the temperature to 1250°C at a rate of 10°C / s on the GLEEBLE-3800 thermal simulation test machine to ensure that a considerable amount of Nb is solid-dissolved to In austenite, it is conducive to the formation of bainite, and keep warm for 10 minutes;
[0037] 3) Carry out two-stage controlled rolling on the sample after holding at 1250°C f...
Embodiment 3
[0041] The chemical composition of the low carbon bainitic steel of this example is as follows. C: 0.060%, Si: 0.25%, Mn: 1.65%, P: ≤0.02%, S: ≤0.003%, Nb: 0.05%, Ti: 0.016%, B: 0.0012%, Al (full): 0.052%, Al (acid soluble): 0.048%, Cr: 0.22%, Mo: 0.17%, V: 0.012%, and the rest is Fe and unavoidable impurities. The low-carbon bainite steel designed according to this composition is subjected to the following steps:
[0042] 1) smelting: adopt vacuum induction furnace smelting, adjust chemical composition to reach within the scope of the present invention;
[0043] 2) Hot rolling the low-carbon bainitic steel ingot with adjusted chemical composition, and raising the temperature to 1250°C at a rate of 10°C / s on the GLEEBLE-3800 thermal simulation test machine to ensure that a considerable amount of Nb is solid-dissolved to In austenite, it is conducive to the formation of bainite, and keep warm for 10 minutes;
[0044] 3) Carry out two-stage controlled rolling on the sample af...
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