High-toughness all-austenitic stainless steel welding wire

Abstract

The invention discloses a high-toughness all-austenitic stainless steel welding wire, which consists of the following components in percentage by weight: 0.03-0.10 percent of C, 0.3-0.90 percent of Si, 2.0-4.5 percent of Mn, 13.0-16.0 percent of Cr, 21-25 percent of Ni, 3.5-5.5 percent of Mo, 0.10-0.30 percent of N, less than or equal to 0.010 percent of S, less than or equal to 0.015 percent of P, less than of equal to 5 percent per million of H and the balance of Fe. The high-toughness all-austenitic stainless steel welding wire has high welding wire manufacturability, the weld metal Rm is 670-715 MPa, the KV2 is up to 112-144J at the temperature 20 DEG C below zero, the welding efficiency is increased by over 100 percent, preheating is not required for welding at the temperature over 0 DEG C, and the welding process is simplified.

Description

technical field [0001] The invention relates to a technology in the field of welding wire, in particular to a high-strength and toughness fully austenitic stainless steel welding wire. Background technique [0002] 10CrNi3MoV steel is a 590MPa high-strength low-alloy steel, which is often used in the construction of large rigid and large restraint structures due to its excellent comprehensive properties. In order to ensure the safety of the structure and prevent welding cold cracks, all austenitic welding consumables must be used for welding parts with high rigidity and large restraint. At present, the supporting all-austenitic welding consumables for 10CrNi3MoV steel are manual welding electrodes of the same strength level, and the welding electrodes have the following problems: [0003] (1) Low welding efficiency; [0004] (2) The welding process is poor, and defects such as slag inclusions and pores are prone to occur at welding positions other than flat welding, and th...

AI Technical Summary

Problems solved by technology

[0003] (1) Low welding efficiency;

[0004] (2) The welding process is poor, and defects such as slag inclusions and pores are prone to occur at welding positions other than flat welding, and the welding quality is difficult to guarantee;

[0005] (3) The welding process is complicated, and it must be preheated at 80-120°C before welding

For example, the application number is 200710025258.7 "austenitic stainless steel gas shielded welding wire for vehicles" patent, the welding wire adopts appropriate C, Si, Mn, Cr and other alloying elements to form a certain amount of acicular ferrite to improve welding toughness. The weld structure is not fully austenitic, and the strength is low (545MPa), which cannot meet the requirements of high strength; the patent of "a ferritic stainless steel welding wire rod, welding wire and its manufacturing method and application" with application number 200710039751.4 , the tensile strength, yield strength and elongation of the deposited metal of the welding wire all meet the strength requirements of the ferritic stainless steel welded joint, but its strength is low and can only reach 490MPa, and the welding wire is not an austenitic welding wire; No. 99117834.3 patent "a low-Cr and high-Mn austenitic steel welding wire", the welding wire uses low-Cr and high-Mn, and adds Mo, Ti and other elements to reduce and suppress the increase in both sides of the joint fusion interface when welding Cr5Mo steel. The generation of C layer (weld side) and poor C layer (base metal side) can improve the service life of the component, but its strength is low and can only reach 345MPa

[0008] Among the existing welding wire patents, another type of more patents is the special welding wire developed for specific steel types, such as the patent "A nickel-saving austenitic stainless steel welding wire" with application number 200710100039.0, in which nitrogen is added to the welding wire Finally, the nickel content in the welding wire is reduced by 2%, which reduces the cost of the welding wire, 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 , its Ni eq Very low, only about 9, when used to weld 10CrNi3MoV steel, due to the dilution of the base metal, martensitic structure will appear in the weld seam, which is very sensitive to welding cold cracks and cannot meet the welding requirements of large steel structures; patent application number It is the 200710023342.5 patent of "welding wire material for austenitic stainless steel". By adding rare earth elements, a welding wire material for welding stainless steel containing rare earth is developed. This patent does not explain the strength of the deposited metal of the welding wire

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