Chemical powder components of 2507 type super double-phase stainless steel flux-cored wire

Abstract

The invention belongs to the field of welding materials and discloses chemical powder components of a 2507 type super double-phase stainless steel flux-cored wire. A common 304L stainless steel metal strip is used as an outer skin; the chemical powder components are filled inside the common 304L stainless steel metal strip to be rolled into a flux-cored wire. The chemical powder components of the 2507 type super double-phase stainless steel flux-cored wire are characterized by comprising the following components in percent by mass: 19 percent-38 percent of rutile, 3 percent-5 percent of zircon sand, 2 percent-4 percent of potassium fluoroaluminate, 1 percent-2 percent of aluminium magnesium alloy, 1 percent-3 percent of chromium nitride, 30 percent-35 percent of metallic chrome, 8 percent-10 percent of metallic nickel, 1 percent-2 percent of electrolytic manganese metal, 14.5 percent-20 percent of metallic molybdenum and 0.5 percent-1 percent of antimony oxide. In the invention, the steel pipe made from the 304L stainless steel strip (with the specification of 10*0.4mm) filled with the chemical powder is manufactured into the super double-phase stainless steel flux-cored wire according to the general production process. CO2 is used as welding protection gas for the flux-cored wire, and the flux-cored wire has the characteristics of good welding operation process performance, attractive welding line moulding, excellent welding process performance, favorable balance of welding tissue austenite and ferrite and the like.

Description

technical field [0001] The invention belongs to the field of welding materials, and relates to the powder composition of a 2507 type super duplex stainless steel welding flux-cored welding wire. Background technique [0002] SAF2507 steel is the most widely used steel in super duplex stainless steel, widely used in chemical industry, shipbuilding and marine engineering, and its supporting welding materials mainly include 2507 super duplex stainless steel electrode and foreign 2507P super duplex stainless steel flux cored wire. Pitting corrosion resistance coefficient PRE of super duplex stainless steel weld deposited metal at home and abroad N >40, while the PRE of the weld deposit metal of general duplex stainless steel N The values ​​are all less than 40. (The welding efficiency of 2507 super duplex stainless steel electrodes is low, and automatic welding cannot be realized, so it is difficult to meet the requirements of the current welding automation. Patents for fl...

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Problems solved by technology

(The welding efficiency of 2507 super duplex stainless steel electrodes is low, and automatic welding cannot be realized, and it is difficult to adapt to the current requirements of higher and higher welding automation.

Although the foreign super-duplex stainless steel welding flux-cored wire 2507P can be used for automatic and semi-automatic welding, the welding efficiency is high, and it has excellent mechanical properties and welding process performance, but this type of welding wire can only use argon-rich gas (Ar+20 %CO 2 ) to ensure the performance of the welded joints, it is not suitable to use commonly used active gases (such as CO 2 Gas) for welding, the scope of use is limited, and the cost performance of welding wire is not high

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