Steel used for straight seam electric resistance welding petroleum casing and casing manufacturing method
A technology of straight seam resistance welding and petroleum casing, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of low weld toughness, easy sticking, and easy weld defects, etc., to achieve excellent strength and toughness, The effect of good anti-stick properties
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Embodiment 1
[0019] Embodiment 1: Taking a batch of straight seam resistance welding oil casing steel and the casing manufacturing method as an example, the present invention will be further described in detail.
[0020] The mass percentage of steel alloy composition (each component) for straight seam resistance welding oil casing pipe is, C: 0.18%, Mn: 1.36%, Si: 0.21%, P: 0.008%, S: 0.003%, N: 0.007%, Ca : 0.003%, Al: 0.03%, Nb: 0.04%; Ti: 0.03%; the rest Fe. Wherein the ratio of Mn to Si is about 6.5:1.
[0021] Method for manufacturing straight seam resistance welded petroleum casing:
[0022] Firstly, hot-rolled coils are prepared: the components of the steel for straight seam resistance welding oil casing are smelted in an oxygen-blown converter, refined outside the furnace, and vacuum degassed; through continuous casting, a slab with a thickness of 250mm is made; and then heated to about 1200°C; the temperature is lowered to 1080-1100°C for rough rolling, and the temperature is 85...
Embodiment 2
[0028] The mass percentage of steel alloy composition (each component) for straight seam resistance welding oil casing pipe is, C: 0.23%, Mn: 1.54%, Si: 0.27%, P: 0.007%, S: 0.004%, N: 0.007%, Nb : 0.07%, Ti: 0.03%, Ca: 0.002%, Al: 0.04%, Mo: 0.23%, Cr: 0.18%, B: 0.003%, and the rest Fe. Among them, the ratio of Mn to Si is about 5.7:1.
[0029] Method for manufacturing straight seam resistance welded petroleum casing:
[0030] Firstly, hot-rolled coils are prepared: the components of the steel for straight seam resistance welding oil casing are smelted in an oxygen-blown converter, refined outside the furnace, and vacuum degassed; through continuous casting, a slab with a thickness of 250mm is made; and then heated to about 1200°C; the temperature is lowered to 1000-1100°C for rough rolling, and the temperature is 850-900°C for finish rolling. Taken, the coiling temperature is 500~600℃, and the hot-rolled coil with a wall thickness of 9.19 mm and excellent comprehensive per...
Embodiment 3
[0037] The mass percentage of steel alloy composition (each component) for straight seam resistance welding oil casing pipe is, C: 0.27%, Mn: 1.59%, Si: 0.21%, P: 0.009%, S: 0.006%, N: 0.006%, Nb : 0.06%, V: 0.05%, Ti: 0.04%, Ca: 0.003%, Al: 0.05%, Mo: 0.28%, Cr: 0.19%, Cu: 0.18%, Ni 0.25%, and the rest Fe. Among them, the ratio of Mn to Si is about 7.6:1.
[0038] Method for manufacturing straight seam resistance welded petroleum casing:
[0039] First, prepare hot-rolled coils: the components of the steel for straight seam resistance welding oil casing are smelted in an oxygen-blown converter, refined outside the furnace, and vacuum degassed; they are continuously cast into a slab with a thickness of 250mm; and then heated to about 1200 ℃; the temperature is lowered to 1080-1100 ℃ for rough rolling, and the temperature is 870-950 ℃ for finish rolling. After finishing rolling, spray water to cool at a cooling rate of 18-23 ℃ / s; ℃, to make a hot-rolled coil with a wall thick...
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