Ultrahigh-intensity all-austenite stainless steel welding wire

Abstract

The invention provides an ultrahigh-intensity all-austenite stainless steel welding wire, and relates to a stainless steel welding wire. The welding wire comprises the following chemical ingredients in percentage by mass: 0.05 to 0.3 percent of C, 0.50 to 1.20 percent of Si, 10 to 15.0 percent of Mn, 16.0 to 20.0 percent of Cr, 3.0 to 7.0 percent of Ni, 0.01 to 0.03 percent of Ti, 0.1 to 0.30 percent of N, 0.15 to 0.30 percent of V, at most 0.010 percent of S, at most 0.020 percent of P and the balance Fe. The ultrahigh-intensity all-austenite stainless steel welding wire is applicable to all-position welding, the welding quality is good, meanwhile, the welding efficiency is also greatly improved, multi-time performance tests prove that when the welding wire is adopted for welding Mn13 steel, the welding seam metal intensity reaches higher than 730 MPa, the toughs reaches about 100J, the performance index requirement is met, in addition, the preheating-free welding is realized, the heat treatment is not needed after the welding, and the welding process is simplified. Compared with a traditional welding wire with the same alloy content, the welding wire provided by the invention ahs the advantages that the intensity of melted metal is improved by 150MPa, in addition, the low-temperature impact is improved by 20J, the result shows that the weld metal integral performance of the welding wire is excellent, in addition, the cost is lower, and higher cost performance is realized.

Description

【Technical field】 [0001] The invention relates to a stainless steel welding wire, in particular to an ultra-high strength full austenitic stainless steel welding wire. 【Background technique】 [0002] It is known that the current high-hardening steel with poor weldability has low thermal conductivity and large expansion coefficient, which makes the temperature gradient in the welding zone large, resulting in large internal stress and prone to cracks; currently, high-hardening steel with a tensile strength greater than 700MPa is used There are two types of welding materials: the first type is low-alloy high-strength steel composition system. The welding process of this type of welding material is complex, requiring pre-welding preheating and post-welding heat treatment, resulting in low welding efficiency, increased labor intensity, and increased energy consumption. Although The cost of welding materials is low, but the cost performance of the whole welding process is relative...

AI Technical Summary

Problems solved by technology

[0003] Searching the current patents of stainless steel welding wire, no fully austenitic welding wire that can meet the strength and toughness requirements has been found. Most of the existing patents for austenitic stainless steel welding wire are low in strength and the weld metal is not fully austenitic. Application No. 200710025258.7 and Publication No. 101100021 disclose austenitic stainless gas shielded welding welding wire for vehicles. In the welding wire, suitable alloying elements such as C, Si, Mn and Cr are used to form a certain amount of acicular ferrite to improve welding toughness. The weld structure is not fully austenitic, and its strength is low (545MPa), which cannot meet the high-strength requirements; some stainless steel welding wire deposits have a duplex structure, such as ER2209, ER2507, ER2594 and other super duplex stainless steels, which have good Comprehensive mechanical properties and welding process performance, but this series of welding wire contains a lot of expensive metals, the cost is too high, and the cost performance is low, so it is difficult to be widely used

Among the existing welding wire patents, another type of more patents is the special welding wire developed for specific steel types. For example, the application number 200710100039.0 and the publication number 101125397 disclose a nickel-saving austenitic stainless steel welding wire. After nitrogen, the nickel content in the welding wire is reduced by 2%, which reduces the cost of the welding wire, and increases the strength of the deposited metal by 150MPa, and improves the low-temperature impact toughness by more than 30J, but the welding wire is developed for ferritic stainless steel with high Cr content However, due to the low Mn content in the welding wire, martensitic structure will appear in the weld due to the dilution of the base metal when welding Mn13 steel, which is very sensitive to welding cold cracks. Cannot meet the welding requirements of hardened structures

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