Method for producing X70 or X80 high-strain steel tube
A technology that resists large deformation and production methods, applied in the direction of pipes, rigid pipes, pipes/pipe joints/fittings, etc., can solve the problem of insufficient understanding of the concept of large deformation pipeline steel, low yield ratio, and failure to consider the forming process. The influence of plasticity, etc., to achieve the effect of excellent longitudinal plastic deformation capacity index, excellent strength and toughness
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Embodiment 1
[0025] A continuous casting slab with a thickness of 260mm was selected and kept at 1220°C for 100 minutes. The weight percentage of its chemical composition is: C: 0.060%, Mn: 1.58%, Si: 0.26%, S: 0.0018%, P: 0.012%, Nb: 0.037 %, Ti: 0.024%, V: 0.029%, Mo: 0.18%, Cu: 0.13%, Ni: 0.16%, Cr: 0.024%, limiting elements B: 0.00040%, Ca: 0.005%, N: ≤0.0065%, O: 0.0018%, the rest is iron and unavoidable impurities.
[0026] The continuous casting slab is subjected to two-stage rolling after dephosphorization by high-pressure water. The rolling start temperature in the austenite recrystallization zone is 1180°C, the total deformation of cross rolling is 38%, the deformation of longitudinal rolling is 50%, the final rolling temperature in the austenite recrystallization zone is 1050°C, and the thickness of the intermediate billet is 80mm.
[0027] The intermediate billet is cooled in air and waited until the temperature reaches 900°C to start rolling in the austenite non-recrystallize...
Embodiment 2
[0032] A continuous casting slab with a thickness of 260mm was selected and kept at 1200°C for 120 minutes. The weight percentage of its chemical composition is: C: 0.075%, Mn: 1.78%, Si: 0.20%, S: 0.0019%, P: 0.010%, Nb: 0.048 %, Ti: 0.016%, V: 0.029%, MNi: 0.21%, Cr: 0.20%, limiting elements B: 0.00025%, Ca: 0.006%, N: ≤0.0055%, O: 0.0015%, the rest are iron and non Avoid impurities.
[0033] The continuous casting slab is subjected to two-stage rolling after dephosphorization by high-pressure water. The rolling start temperature in the austenite recrystallization zone is 1170°C, the total deformation of cross rolling is 28%, the deformation of longitudinal rolling is 60%, the final rolling temperature in the austenite recrystallization zone is 1040°C, and the thickness of the intermediate billet is 85mm.
[0034] The intermediate billet is air-cooled and waited until the temperature reaches 910°C to start rolling in the austenite non-recrystallized zone, the compression ra...
Embodiment 3
[0039] Select a continuous casting slab with a thickness of 240mm and hold it at 1200°C for 120min. The weight percentage of its chemical composition is: C: 0.065%, Mn: 1.82%, Si: 0.25%, S: 0.0016%, P: 0.008%, Nb: 0.056 %, Ti: 0.018%, V: 0.022%, Mo: 0.25%, Cu: 0.24%, Ni: 0.21%, Cr: 0.18%, limiting elements B: 0.00035%, Ca: 0.007%, N: ≤0.006%, O: 0.0018%, the rest is iron and unavoidable impurities.
[0040] The continuous casting slab is subjected to two-stage rolling after dephosphorization by high-pressure water. The rolling start temperature in the austenite recrystallization zone is 1180°C, the total deformation of cross rolling is 35%, the total deformation of longitudinal rolling is 50%, the final rolling temperature of austenite recrystallization zone is 1030°C, and the thickness of the intermediate billet is 85mm.
[0041] The intermediate billet is air-cooled and waited until the temperature reaches 920°C to start rolling in the austenite non-recrystallized zone, the...
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