X80 large-diameter thick-wall longitudinal submerged arc welding pipe applicable to low temperature and manufacturing method thereof
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A technology of straight seam submerged arc welding and manufacturing methods, applied in the direction of manufacturing tools, arc welding equipment, welding media, etc., to achieve excellent low-temperature toughness, good low-temperature toughness, and the effect of eliminating undercut
Active Publication Date: 2018-11-13
BC P INC CHINA NAT PETROLEUM CORP +1
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In addition, there is no reference at home and abroad to the X80 steel grade, which is suitable for low-temperature environments and has excellent low-temperature toughness, with a pipe diameter of 1422 mm and a wall thickness > 30 mm.
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Embodiment 1
[0034] Example 1: Manufacture of X80 steel grade Φ1422×30.8mm low temperature straight seam submerged arc welded pipe.
[0035] (1) The raw material is X80 steel grade hot-rolled steel plate with a wall thickness of 30.8mm, and its main alloy element content: C0.05%, Si 0.21%, Mn 1.67%, S 0.001%, P 0.010%, Ni 0.18%, Cr 0.16%, Cu 0.21%, Nb 0.07%, V 0.005%, Ti 0.016%, Mo 0.12%, Al 0.03%, N 0.006%, B 0.0003%, and the balance is Fe.
[0036] (2) Ultrasonic inspection of steel plates, 100% ultrasonic testing of steel plates.
[0037](3) Edge milling, the groove size is 70° for the upward groove, 70° for the downward groove, the depth of the downward groove is 11.5mm, and the blunt edge is 10.0mm.
[0038] (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.
[0039] (5) JCO forming. On the forming machine, one side of the pre-bent steel plate is first pressed to form a "J" shape, and...
Embodiment 2
[0057] Example 2: Manufacture of X80 steel grade Φ1422×33.8mm low temperature straight seam submerged arc welded pipe.
[0058] (1) The raw material is X80 steel grade hot-rolled steel plate with a wall thickness of 33.8mm, and its main alloy element content: C0.07%, Si 0.25%, Mn 1.65%, S 0.002%, P 0.010%, Ni 0.19%, Cr 0.24%, Cu 0.12%, Nb 0.05%, V 0.04%, Ti 0.016%, Mo 0.20%, Al 0.03%, N 0.005%, B 0.0003%, and the balance is Fe.
[0059] (2) Ultrasonic inspection of steel plates, 100% ultrasonic testing of steel plates.
[0060] (3) For edge milling, the groove size is 70° for the upward groove, 70° for the downward groove, 12.5mm for the downward groove, and 10.0mm for the blunt edge.
[0061] (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.
[0062] (5) JCO forming. On the forming machine, one side of the pre-bent steel plate is first pressed to form a "J" shape, and then t...
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Abstract
The invention discloses an X80 large-diameter thick-wall longitudinal submerged arc welding pipe applicable to the low temperature and a manufacturing method thereof. A parent material of the weldingpipe comprises, by mass percentage, 0.04-0.08% of C, 0.15-0.30% of Si, 1.60-1.85% of Mn, less than or equal to 0.004% of S, less than or equal to 0.010% of P, 0.15-0.30% of Ni, 0-0.30% of Cr, 0.1-0.3%of Cu, 0.05-0.10% of Nb, 0.005-0.04% of V, 0.015-0.03% of Ti, 0.10-0.35% of Mo, 0.02-0.05% of Al, less than or equal to 0.008% of N and 0.0003-0.0005% of B. The manufacturing method comprises the steps of preparing a hot rolled steel plate according to the mass percentages of the chemical compositions; and conducting ultrasonic inspection, edge milling, pre-flanging, JCO formation, prewelding, inner welding, outer welding, welding seam X-ray inspection, steel pipe expanding, hydrostatic testing, welding seam ultrasonic testing, pipe end X-ray inspection, chamfering, pipe end magnetic particletesting and appearance quality inspection on the steel plate. A welding joint of the welding pipe is good in low-temperature toughness; and on the premise that heat treatment is not conducted on thewelding pipe after pipe manufacturing, the welding pipe can be directly used at the temperature of minus 45 DEG C or even lower.
Description
Technical field: [0001] The invention relates to a straight seam submerged arc welded pipe and a manufacturing method thereof, in particular to an X80 large-diameter thick-walled straight seam submerged arc welded pipe suitable for low temperature and a manufacturing method thereof. Background technique: [0002] With the continuous development of oil and natural gas exploration to the alpine and permafrost regions and the continuous pursuit of pipeline transportation efficiency and economy, the demand for large-diameter, low-temperature submerged arc welded pipes is increasing. my country is a country with a complex natural environment. When the oil and gas pipeline passes through some alpine regions in the northeast and northwest of my country, the temperature in winter is relatively low. The minimum metal design temperature is -45°C. Under the premise of not adopting heat preservation and heat tracing measures, the current submerged arc welded pipes cannot meet the needs o...
Claims
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