Quenched and tempered low-yield ratio pipeline steel and preparation method thereof
A low yield ratio, pipeline steel technology, applied in the field of pipeline steel production, can solve the problems of low yield ratio and difficulty in controlling the drop weight performance.
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Embodiment 1
[0020] For 17.5mm pipeline steel, the final rolling temperature of the steel plate is 840-860°C, rapid water cooling after rolling, and the final cooling temperature is 520-560°C, to refine the original grains of the hot-rolled steel plate. Among them, the quenched and tempered low yield strength ratio pipeline steel includes the following components in weight percentage: C 0.08~0.12%, Si 0.15~0.35%, Mn 1.45~1.70%, P≤0.02%, S≤0.01%, Nb 0.030~ 0.050%, V 0.015-0.035%, Ti 0.050-0.075%, Mo 0-0.30%, and the balance is iron and unavoidable impurities.
[0021] Use thermal radiation heating roller hearth non-oxidation heating furnace, control the heating temperature in the two-phase area of 840 ℃ ~ 880 ℃, control the heating time in 30 ~ 45min, adopt sub-temperature quenching, can refine the grains, increase the grain boundaries, and retain some The ferrite that has not changed is used to improve the toughness of the steel plate and reduce the yield ratio of the steel plate; it is ...
Embodiment 2
[0026] For 22.2mm pipeline steel, the final rolling temperature of the steel plate is 830-850°C, rapid water cooling after rolling, and the final cooling temperature is 520-560°C, to refine the original grains of the hot-rolled steel plate. Among them, the quenched and tempered low yield strength ratio pipeline steel includes the following components in weight percentage: C 0.08~0.12%, Si 0.15~0.35%, Mn 1.45~1.70%, P≤0.02%, S≤0.01%, Nb 0.030~ 0.050%, V 0.015-0.035%, Ti 0.050-0.075%, Mo 0.10-0.30%, and the balance is iron and unavoidable impurities.
[0027] Use thermal radiation heating roller hearth non-oxidation heating furnace, control the heating temperature in the two-phase area of 840 ℃ ~ 880 ℃, control the heating time in 40 ~ 60 minutes, adopt sub-temperature quenching, can refine the grains, increase the grain boundaries, and retain some Unchanged ferrite to improve the toughness of the steel plate and reduce the yield ratio of the steel plate; add an appropriate am...
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