High-strength hot-rolled reinforcement bar of 830 MPa level, and production technology thereof
A production process, 830mpa technology, applied in the field of steel bars and their production processes, can solve the problems of low yield strength of hot-rolled steel bars and difficulty in ensuring the yield platform, achieve good ductility, avoid excessive corrosion rate and hardness, and reduce the amount of steel bars Effect
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Embodiment 1
[0034] The 830MPa grade high-strength hot-rolled steel bar in this embodiment has the following chemical components by weight: C: 0.38%, Cr: 0.7%, Mn: 0.6%, Mo: 0.25%, Si: 0.2%, Ni: 1.6%, S: 0.025%, P: 0.03%, N: 0.025%, and the balance is Fe.
[0035] The production process of the 830MPa grade high-strength hot-rolled steel bar of the present embodiment is carried out according to the following steps:
[0036] (1) The smelted steel bars are sent to the heating furnace to be heated to 1200 ° C, and then the steel bars are rapidly cooled to 640 ° C through the first online cooling process, and then quenched with water or quenching liquid in the quenching device for 15 seconds, and then passed through The tempering furnace is heated to 660℃ for tempering, and then cooled to normal temperature through the second cooling process;
[0037] The first cooling process: use water cooling to water-cool the steel bars to 640°C at a cooling rate of 9°C / s;
[0038] The second cooling proc...
Embodiment 2
[0045] The 830MPa grade high-strength hot-rolled steel bar in this embodiment has the following chemical components by weight: C: 0.41%, Cr: 0.8%, Mn: 0.7%, Mo: 0.15%, Si: 0.25%, Ni: 1.8%, S: 0.015%, P: 0.025%, N: 0.015%, and the balance is Fe.
[0046] The production process of the 830MPa grade high-strength hot-rolled steel bar of the present embodiment is carried out according to the following steps:
[0047] (1) The smelted steel bars are sent to the heating furnace to be heated to 1100 ° C, and then the steel bars are rapidly cooled to 650 ° C through the first online cooling process, and then quenched with water or quenching liquid in the quenching device for 16 seconds. The tempering furnace is heated to 600 ℃ for tempering, and then cooled to normal temperature through the second cooling process;
[0048] The first cooling process: use water cooling to water-cool the steel bar to 650°C at a cooling rate of 10°C / s;
[0049] The second cooling process: the combination ...
Embodiment 3
[0056] The 830MPa grade high-strength hot-rolled steel bar in this embodiment has the following chemical components by weight: C: 0.43%, Cr: 0.9%, Mn: 0.8%, Mo: 0.2%, Si: 0.3%, Ni: 2%, S: 0.013%, P: 0.015%, N: 0.012%, and the balance is Fe.
[0057] The production process of the 830MPa grade high-strength hot-rolled steel bar of the present embodiment is carried out according to the following steps:
[0058] (1) The smelted steel bars are sent to the heating furnace to be heated to 1010 ° C, and then the steel bars are rapidly cooled to 660 ° C through the first cooling process on-line, and then quenched with water or quenching liquid in the quenching device for 17 seconds. The tempering furnace is heated to 520 ℃ for tempering, and then cooled to normal temperature through the second cooling process;
[0059] The first cooling process: use water cooling to water-cool the steel bars to 660°C at a cooling rate of 11°C / s;
[0060] The second cooling process: the combination of...
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