Special welding material for austenite high alloy steel and application

Abstract

The invention discloses a special welding material for austenite high alloy steel and an application, and belongs to the technical field of welding. The special pipe welding material comprises the following raw materials by weight: 0.04%-0.14% of C, 0.65%-1.0% of Si, 6.5%-8.0% of Mn, 18.5%-22.0% of Cr, 8.0%-10.7% of Ni, less than or equal to 0.75% of Cu, less than or equal to 1.0% of Mo, and the balance Fe. The special welding material has good strength, toughness, plasticity and weld metal mechanical properties, especially can optimize the microscopic structure of a fusion zone, effectively reduces the sensitivity of welding cold cracks and hot cracks, and eliminates the welding heat treatment process (preheating before welding and slow cooling after welding). The requirement for the field welding environment is reduced (the industrial technical situation that welding construction cannot be conducted at the temperature of minus 5 DEG C is fundamentally changed), the welding process is simplified, the working efficiency is improved, and the construction cost is reduced.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a special welding consumable for austenitic high-alloy steel and its application. Background technique [0002] Welding, commonly known as "the needle and thread of steel". About 40% of the amount of steel used in industry needs to be connected by welding (permanent connection). [0003] In addition to mechanical equipment manufacturing, more industries involved in welding engineering technology are "metal structure manufacturing and installation" required by various technical fields. For example, building steel structures, cast steel nodes of building space structures, gas oil pipelines, ship structures, power towers and stainless steel composite plate components, etc., and its metal structures tend to be more and more developed towards the goal of "high strength and light weight". . [0004] At the same time, following the changing trend of the application of base metal ste...

AI Technical Summary

Problems solved by technology

Under the continuous action of dynamic load and its alternating stress, the casting structure will further aggravate the fatigue damage of the metal, and its cracks will inevitably expand from the inside to the surface or from the surface to the inside, gradually forming macroscopic metal defects: surface Metal spalling (pitting, lamellar cracks and local defects) or structural cracks (presenting penetrating structural cracks in all directions), so they cannot continue to serve and lead to the final failure of large cast steel workpieces, which has become a major problem in the production process of cement manufacturers. common problem

In addition to the cumbersome process, the original technical solution also faces the disadvantage of high "hot crack sensitivity" (caused by the precipitation of sulfide with a low melting point) in the welding process of Cr24Ni13 high-alloy welding consumables

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