Production method of steel for welded pipe with yield strength of 300mpa
A technology of yield strength and production method, which is applied in the field of production of hot-rolled steel plates for welded pipes, can solve problems such as increased costs, and achieve the effects of low cost of steel alloys, good matching of strength and toughness, and stable mechanical properties
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Embodiment 1
[0039] Example 1: The chemical composition weight percentage is C: 0.09%, Si: 0.02%, Mn: 0.68%, P: 0.018%, S: 0.019%, Ti: 0.010, Al: 0.024%, the balance is Fe and unavoidable Composition of impurity elements; during the steelmaking process, 215kg of active lime and 65kg of fluorite were added, 230kg of slagging agent was added after tapping, and the oxygen was fixed after blowing argon for 7 minutes. After the Al line, argon gas with a pressure of 360 Pa was passed into the bottom of the molten steel tank for 4 minutes. After electric heating and re-feeding of Al wire, 1025m of Ca-Si wire is fed, the heating temperature of the hot-rolled billet is 1220°C, and the time is 1.1 hours; the starting temperature of hot-rolling rough rolling is 1170°C, and the descaling water pressure is 23.0MPa; The starting temperature of finishing rolling is 1010℃, the starting speed of finishing rolling is 1.70m / s, the temperature of finishing rolling is 870℃, and the rolling speed of finishing r...
Embodiment 2
[0040] Embodiment 2: The weight percentage of chemical composition is C: 0.09%, Si: 0.02%, Mn: 0.68%, P: 0.018%, S: 0.019%, Ti: 0.015, Al: 0.020%. The balance is composed of Fe and unavoidable impurity elements; during the steelmaking process, 230kg of active lime and 50kg of fluorite are added, 220kg of slagging agent is added after tapping, and the oxygen is fixed after blowing argon for 5.5min. The activity is 32ppm, and after feeding the Al wire for the second time, argon gas with a pressure of 240Pa is passed into the bottom of the molten steel tank for 8 minutes. After electric heating and re-feeding of Al wire, 950m of Ca-Si wire is fed, the heating temperature of hot-rolled billet is 1220°C, and the time is 1.0 hour; the starting temperature of hot-rolling rough rolling is 1165°C, and the descaling water pressure is 24.0MPa; The starting temperature of finish rolling is 960°C, the starting speed of finish rolling is 1.80m / s, the temperature of finish rolling is 880°C, ...
Embodiment 3
[0041] Example 3: The weight percentage of chemical components is C: 0.08%, Si: 0.03%, Mn: 0.67%, P: 0.016%, S: 0.013%, Ti: 0.030, Al: 0.032%. The balance is composed of Fe and unavoidable impurity elements; during the steelmaking process, 210kg of active lime and 55kg of fluorite are added, 215kg of slagging agent is added after tapping, and the oxygen is fixed after blowing argon for 4.5min. The activity is 40ppm, and after feeding the Al wire for the second time, argon gas with a pressure of 420Pa is passed into the bottom of the molten steel tank for 6 minutes. After electric heating and re-feeding of Al wire, 1120m of Ca-Si wire is fed, the heating temperature of hot-rolled billet is 1230°C, and the time is 1.3 hours; the starting temperature of hot-rolling rough rolling is 1180°C, and the descaling water pressure is 26.0MPa; Finish rolling start temperature is 1020°C, finish rolling start speed is 2.30m / s, finish rolling temperature is 875°C, finish rolling exit rolling ...
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Abstract
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