A method of manufacturing x100 high steel grade large diameter thick wall longitudinal submerged arc welded pipe
A technology of straight seam submerged arc welding and manufacturing method, used in manufacturing tools, arc welding equipment, welding equipment, etc., can solve the problems of strength and toughness matching of welded joints, uneven forming, and decline in mechanical properties of pipe bodies, and achieve guaranteed strength. and toughness, uniform performance, and avoid the effect of serious decline in tube performance
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[0027] Example: Manufacture of X100Φ1219×20.6mm straight seam welded pipe
[0028] (1) The raw material is an X100 steel plate with a wall thickness of 20.6mm, and its main alloy element content: C0.06%, Si0.27%,
[0029] Mn1.75%, S0.002%, P0.01%, Ni0.26%, Cr0.02%, Cu0.21%, Nb0.06%, V0.003%, Ti0.01%, Mo0.20%, Al0.05%, N0.008%, B0.0001%, the balance is Fe, of which CE (Pcm) is 0.19.
[0030] (2) Ultrasonic inspection of steel plates, 100% ultrasonic testing of steel plates.
[0031] (3) Edge milling, the groove size is 37.5° for the upward groove, 40° for the downward groove, the depth of the downward groove is 8.0mm, and the blunt edge is 7.0mm.
[0032] (4) Pre-bending, use the pre-bending machine to pre-bend the edge of the plate, so that the curvature of the edge of the plate meets the requirements.
[0033] (5) JCO forming, first press one side of the pre-bent steel plate 10 times on the forming machine, each time the feed rate is 165.4mm, press it into a "J" shape, an...
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