Rolling method for low carbon twisted steel bar
A technology of threaded steel bar and low carbon steel, applied in the field of metal rolling, can solve the problem that the strength-to-yield ratio cannot be reached, and the tensile strength of grade III steel bar cannot be fully satisfied.
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Embodiment 1
[0019] The composition of the selected steel grade is 0.21%C-0.40%Si-0.79%Mn, the starting rolling temperature is 950°C, the temperature is controlled by water cooling between the intermediate and finishing rolling units and between the racks, the temperature of the finishing rolling mill is 840°C, and then the temperature is ≥10°C / The cooling rate of S is cooled to 600°C. The average yield strength obtained is σ s =460Mpa, tensile strength σ b = 630Mpa, elongation = 22.5%, strength ratio σ b / σ s =1.36, the structure is ferrite + pearlite, the ferrite grain size is 10 μm, and the pearlite grain size is 7 μm. The performance reaches the national standard of grade III steel bar.
Embodiment 2
[0021] The composition of the selected steel grade is 0.22%C-0.35%Si-0.60%Mn, the starting rolling temperature is 950°C, the temperature is controlled by water cooling between the intermediate and finishing rolling units and between the racks, the temperature of the finishing rolling mill is 850°C, and then the temperature is ≥10°C / The cooling rate of S is cooled to 550°C. The average yield strength obtained is σ s =450Mpa, tensile strength σ b = 610Mpa, elongation = 25%, strength ratio σ b / σ s =1.35, the structure is ferrite + pearlite, the ferrite grain size is 8 μm, and the pearlite grain size is 5 μm. The performance reaches the national standard of grade III steel bar.
Embodiment 3
[0023] The composition of the selected steel grade is 0.21%C-0.53%Si-0.8%Mn, the starting rolling temperature is 920°C, the temperature is controlled by water cooling between the intermediate and finishing mills and between the racks, the temperature of the finishing mill is 830°C, and then the temperature is ≥10°C / The cooling rate of S is cooled to 500°C. The average yield strength obtained is σ s =520Mpa, tensile strength σ b = 660Mpa, elongation = 22%, strength ratio σ b / σ s =1.26, the structure is ferrite + pearlite, the ferrite grain size is 7.5 μm, and the pearlite grain size is 5 μm. The performance reaches the national standard of grade IV steel bar.
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