Electric welding rod for gas shielded welding X80 grade steel oil, gas transmission pipe
A technology of gas shielded welding and conveying pipes, which is applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problems of poor performance matching between weld seam and X80 pipe body, poor anti-oxidation and corrosion resistance, and low toughness, etc., to achieve Effects of low hardness, improved oxidation resistance, and extended life
Active Publication Date: 2011-09-14
ATLANTIC CHINA WELDING CONSUMABLES +1
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In the patent document with the patent number 200810052501 and the invention name "X80 Steel Grade Pipeline Steel Gas Shielded Welding Solid Wire", a composition by weight percentage is disclosed: C0.04-0.08%, Mn1.40-2.0% , Si0.40-0.70%, 0
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Embodiment Construction
[0007] Take X80 grade steel pipe welding wire with welding diameter of Φ1219mm and wall thickness of 22mm, 26.4mm and 33mm as an example: put the required raw materials into the vacuum induction furnace in proportion, and make wire rod after smelting according to the conventional gas shielded welding wire smelting process After drawing, heat treatment, drawing to a diameter of Φ1.5mm, and then cleaning, copper plating, and coiling, the chemical composition (by weight percentage) is: C0.10%, Mn1.57%, Si0.56% , S0.004%, P0.010%, Cr0.22%, Ni0.80%, Mo0.22%, Cu0.14%, Ti0.13%, B0.006%, Fe96.2%, the rest is impurity of welding wire. The welding wire has been subjected to grouped straight seam submerged arc welding experiments on X80 grade steel pipes with different thicknesses and components:
[0008] Experiment 1: The welding wire produced in this embodiment was used for 5 sets of straight seam submerged arc welding experiments on Φ1219×22mm X80 grade steel pipes. The performance o...
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Abstract
The invention discloses a gas-shielded welding wire used for the production of grade X80 steel and oil and gas transferring. The gas-shielded welding wire comprises the following chemical compositions (according to the weight percentage): 0.08-0.12 percent of C, 1.40-2.0 percent of Mn, 0.30-0.70 percent of Si, larger than 0 and smaller than or equal to 0.015 percent of P, larger than 0 and smaller than or equal to 0.015 percent of S, 0.20-0.40 percent of Mo, 0.10-0.35 percent of Cu, 0.10-0.2 percent of Ti, 0.15-0.40 percent of Cr, 0.65-0.90 percent of Ni, 0.004-0.008 percent of B, 94.9-97.0 percent of Fe, and impurity for the residual; the gas-shielded welding wire is produced according to the production technique of common gas-shielded welding wire. The pipe used for production has the following welding seam performances: the tensile strength is 665-750MPa, the yield strength is 555-680MPa, the specific elongation is 20-29 percent, the hardness is 205-236HV10, the Charpy Impact energy is Akv(-10 DEG C)=230-262J, and the shearing area is 66-73; the Charpy Impact energy of the heat affected zone is Akv(-10 DEG C)=224-268J, the shearing area is 75-83, the performances are greatly superior to the requirements on the welding seam performance of the grade X80 steel pipe, the gas-shielded welding wire has excellent performances such as high strength, high toughness, good corrosion resistance, low hardness and the like which are similar to the performances of the pipe body, the security of pipe transportation can be effectively enhanced, and the service life of the pipe transportation can be prolonged.
Description
technical field [0001] The invention belongs to welding wire for metal material welding, in particular to a gas-shielded welding wire for welding production of X80 grade steel oil and gas delivery pipes. After the pipe (body) is welded with the welding wire, the weld seam has excellent performances such as high strength, high toughness, good corrosion resistance and low hardness similar to the pipe body. Background technique [0002] Pipeline transportation is the most ideal transportation method for long-distance transportation of oil and natural gas. It has the characteristics of economy, safety, high efficiency, energy saving, uninterrupted, and less damage to the environment. Therefore, all countries in the world attach great importance to the development of pipeline transportation technology, and many countries spare no effort to spend a lot of financial and material resources to vigorously develop the pipeline transportation industry. Pipeline transportation has becom...
Claims
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IPC IPC(8): B23K35/40B23K35/30B23K9/16
Inventor 佘应堂郑海杨强王旭李延丰李志华
Owner ATLANTIC CHINA WELDING CONSUMABLES