Flux-cored wire used for low-alloy chrome molybdenum heat-resistant steel and application thereof

A heat-resistant steel, low-alloy technology, used in welding media, welding equipment, metal processing equipment, etc., can solve the problem of poor low-temperature impact toughness, poor welding process performance of basic heat-resistant steel flux-cored wire, and inability to perform all-position welding and other problems, to achieve the effect of excellent impact performance and stable impact value

Active Publication Date: 2017-09-05
武汉铁锚焊接材料股份有限公司
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  • Abstract
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems of poor low-temperature impact toughness of the existing acidic heat-resistant steel

Method used

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  • Flux-cored wire used for low-alloy chrome molybdenum heat-resistant steel and application thereof
  • Flux-cored wire used for low-alloy chrome molybdenum heat-resistant steel and application thereof

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[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0036] Example The low-carbon steel sheath of the low-alloy chromium-molybdenum heat-resistant steel flux-cored wire is cold-rolled carbon steel thin steel strip with a thickness of 0.8-0.9mm and a width of 14mm; the quality of the flux core accounts for the total mass of the entire flux-cored wire 13-16%, that is, the filling rate is 13-16%; the core powder is pre-baked, and then the steel strip is formed, filled with powder, jointed, an...

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Abstract

The invention provides a flux-cored wire used for low-alloy chrome molybdenum heat-resistant steel. The flux-cored wire comprises a low-carbon steel sheath and a flux core which is stuffed in the low-carbon steel sheath. The flux core comprises the following components in percentage by mass: 30-35% of natural rutile, 2-5% of magnesium oxide, 1.5-3% of barium carbonate, 2-3% of elpasolite, 2-5% of potassium titanate, 15-20% of a silicomanganese alloy, 8-10% of chromium, 3.5-5% of ferromolybdenum, 1-2% of ferro-aluminum, 0.5-2.5% of roasted aluminum oxide, 0.5-1% of nickel powder, 0.5-1.5% of magnetite and the balance of iron powder and inevitable impurities. The flux-cored wire has the advantages that deposited metal composition completely accords with stipulation of related national standards, and the all-position welding requirement of the 1-1.25%Cr-0.5%Mo heat-resistant steel can be met; meanwhile, the mechanical performance indexes of deposited metal completely accord with stipulation of related national standards; impact property of the deposited metal is excellent, and specially, low-temperature impact toughness (minus 30 DEG C) is stabilized at more than 50J; and an impact value is stable.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a low-alloy chromium-molybdenum heat-resistant steel flux-cored welding wire and its application. Background technique [0002] Chromium-molybdenum heat-resistant steel is widely used in cutting-edge industries such as thermal power generation, petrochemical industry, aviation, and atomic energy. The equipment is gradually developing in the direction of large-scale and high-parameters, which requires heat-resistant steel materials and supporting welding materials to have more excellent mechanical properties. At present, the welding methods of chrome-molybdenum heat-resistant steel include manual electrode arc welding, argon tungsten arc welding, gas metal shielded welding and submerged arc welding, among which, the gas metal shielded welding method of flux cored wire has good process performance and good deposition It has many advantages such as high efficie...

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Application Information

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IPC IPC(8): B23K35/02B23K35/22
CPCB23K35/02B23K35/0266B23K35/22
Inventor 宋昌宝徐文福王玲艳王哲
Owner 武汉铁锚焊接材料股份有限公司
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