A seamless metal powder-cored flux-cored welding wire for chrome-molybdenum steel
A technology of flux-cored welding wire and metal powder core, applied in metal processing equipment, welding medium, welding equipment, etc., can solve problems such as poor high-temperature mechanical properties, and achieve excellent welding process performance, high deposition efficiency, and slag coverage low rate effect
Active Publication Date: 2017-08-04
WUHAN TEMO WELDING CONSUMABLES CO LTD
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Problems solved by technology
[0008] The technical problem to be solved by the present invention is that the existing chromium-molybdenum steel flux-cored welding wire still has the problem of poor high-temperature mechanical properties, and a new seamless metal powder-cored flux-cored welding wire for chromium-molybdenum steel is provided
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[0034] The present invention will be further described below in conjunction with specific examples, so that those skilled in the art can better understand the present invention and implement it, but the given examples are not intended to limit the present invention.
[0035] The flux-cored welding wire of this group of examples has the following chemical components in mass percent: C: 0.02-0.06%, Si: 0.30-0.70%, Mn: 1.0-1.5%, Cr: 7.5-12%, Ni: 0.45-0.70 %, Mo: 0.5-1.1%, V: 0.15-0.35%, and the balance is Fe.
[0036] The preparation method of the flux-cored welding wire in this group of examples: the steel strip method is used to make a U shape, the composition of the flux core is filled, laser welding, drawing, annealing, secondary drawing to a specified diameter welding wire (1.2 or 1.4mm), The flux-cored welding wire is obtained after copper plating on the surface, and the filling rate is 18-20%.
[0037] Application of the above flux cored wire: 95% Ar+5% CO 2Protection, w...
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Abstract
The invention discloses a seamless metal powder core type flux-cored wire for chromium-molybdenum steel. The seamless metal powder core type flux-cored wire comprises carbon steel skin and a flux core, wherein the skin is filled with the flux core. The flux core comprises, by mass, 0.02%-0.06% of C, 0.30%-0.70% of Si, 1.0%-1.5% of Mn, 7.5%-12% of Cr, 0.45%-0.70% of Ni, 0.5%-1.1% of Mo, 0.15%-0.35% of V and the balance Fe and inevitable impurities. According to the wire, a metal powder core type slag system is adopted, and an Mn-Mg-Si combined deoxidation way is adopted; the wire has excellent high-temperature (heat treatment is conducted by rule at the temperature of 720 DEG C for ten hours after welding) tensile strength and impact toughness; the welding technological performance is excellent, the welding efficiency is high, and the impact toughness at the temperature of 20 DEG C is higher than 150 J; the seamless metal powder core type flux-cored wire is particularly suitable for flat welding of 9Cr1MoVNb steel with the yield strength being 550 MPa and welding of a flat fillet welded position.
Description
technical field [0001] The invention relates to a seamless metal powder-cored flux-cored welding wire for chrome-molybdenum steel. Background technique [0002] Flux-cored wire is a high-efficiency welding material, which has many advantages such as high welding efficiency, good welding process performance, and beautiful weld shape, so it is widely used in the welding of steel structures such as ships and bridges. Seamless metal powder-cored flux-cored wire combines the advantages of flux-cored wire and solid wire. It has high production efficiency, good welding processability, and easy adjustment of composition. It is the best matching welding material for heat-resistant steel. [0003] At present, heavy industrial fields such as supercritical units and petrochemical cracking furnaces are using welding chromium molybdenum steel such as 9Cr1MoVNb steel. The commonly used welding methods include gas shielded welding, Tig welding, MIG welding, etc. Tig welding is less efficie...
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IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3053B23K35/40
Inventor 孟庆润周海龙杨宗全
Owner WUHAN TEMO WELDING CONSUMABLES CO LTD