Pipeline steel X70 steel plate in low compression ratio, and production method thereof
A technology with low compression ratio and production method, which is applied in the field of high-strength and high-toughness pipeline steel X70 steel plate to produce low compression ratio. It can solve the problems of low impact toughness and failure to meet engineering technical requirements, etc., to improve drop hammer performance, The effect of increasing the uniform elongation of the material
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[0021] Example 1
[0022] The chemical composition (wt%) of the low compression ratio pipeline steel X70 hot-rolled flat plate in this embodiment is shown in Table 1.
[0023] Table 1 Chemical composition of low compression ratio pipeline steel X70 steel plate (wt%)
[0024] element
[0025] The specific parameters of the rolling process and the laminar segmented cooling process in the production process of the low compression ratio pipeline steel X70 steel plate in this embodiment are shown in Table 2.
[0026] The production process of the low compression ratio pipeline steel X70 steel plate in this embodiment: the reheating temperature is 1250°C, and the furnace time is 3 hours. Two-stage controlled rolling is adopted. Rough rolling is 4 passes in the recrystallization zone, the start rolling temperature is 1100°C, and the final rolling temperature is 1080°C; the intermediate billet thickness is 68mm, and the finish rolling is 7 passes in the non-recrystallization zone. The sta...
Example Embodiment
[0033] Example 2
[0034] The chemical composition (wt%) of the low compression ratio pipeline steel X70 hot-rolled flat plate in this embodiment is shown in Table 4.
[0035] Table 4 Chemical composition of low compression ratio pipeline steel X70 steel plate (wt%)
[0036] element
[0037] The production process of the low compression ratio pipeline steel X70 steel plate in this embodiment: the reheating temperature is 1250°C, and the furnace time is 3 hours. Two-stage controlled rolling is adopted. Rough rolling is 4 passes in the recrystallization zone, the start rolling temperature is 1100°C, and the final rolling temperature is 1085°C; the thickness of the intermediate billet is 69mm, and the finish rolling is 7 passes in the non-recrystallization zone. The start-rolling temperature is 870°C, and the final rolling temperature is 760°C. After rolling, it is cooled to 420°C by laminar flow cooling process, and then cooled to room temperature on the roller table and cooling be...
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