Stainless steel submerged-arc welding strip with improved room temperature tensile strength
A tensile strength, stainless steel technology, applied in the direction of arc welding equipment, welding equipment, welding medium, etc., can solve the problems that cannot meet the product requirements, the tensile strength cannot meet the technical requirements, etc., and achieve the effect of improving the tensile strength at room temperature
Inactive Publication Date: 2016-01-20
HARBIN WELDING INST LTD +2
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Problems solved by technology
The tensile strength of existing welding materials after welding and heat treatment cannot meet the technical requirements. For example, a company has used a variety of commercial EQ308L welding strips + matching submerged arc flux for experiments. Under different welding parameters, the deposited metal after heat treatment The tensile strength ranges from 490MPa to 520MPa, which cannot meet the product requirements
Method used
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Embodiment 1
[0013] Example 1, the mass percent of stainless steel submerged arc welding strip is: C≤0.10, Si: 0.45, Mn: 2.23, S≤0.005, P≤0.01, Cr: 19.84, Ni: 10.42, Mo≤0.01, Cu≤ 0.01, Co≤0.01, N: 0.10, the rest is Fe.
Embodiment 2
[0014] Example 2, the mass percentage of stainless steel submerged arc welding strip is: C≤0.10, Si:0.40, Mn:1.71, S≤0.006, P≤0.01, Cr:20.73, Ni:10.14, Mo≤0.01 , Cu≤0.01, Co≤0.01, N: 0.13, and the rest is Fe.
[0015] In order to determine the applicability of the present invention, 3 kinds of welding strips are selected for testing, and the comparative examples and invention examples are respectively explained. The chemical composition of the 3 kinds of welding strips meets the technical requirements of American Standard ASMEII volume C chapter A5.9-2007 at the same time, and the specific results See Table 1.
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Abstract
The invention provides a stainless steel submerged-arc welding strip with improved room temperature tensile strength. The stainless steel submerged-arc welding strip with improved room temperature tensile strength comprises the following components by mass percentage: less than or equal to 0.020 of C, 0.30-0.65 of Si, 1.0-2.5 of Mn, less than or equal to 0.01 of S, less than or equal to 0.025 of P, 19.5-21.0 of Cr, 9.0-11.0 of Ni, less than or equal to 0.50 of Mo, less than or equal to 0.50 of Cu, less than or equal to 0.50 of Co, 0.07-0.20 of N and the balance Fe. After welding and thermal treatment, the room temperature mechanical properties of deposited metal is as follows: Rm is greater than or equal to 520Mpa, Rp0.2 is greater than or equal to 260MPa, and A4 is greater than or equal to 35%. Compared with the prior art, the stainless steel submerged-arc welding strip with the improved room temperature tensile strength has the advantages that the room temperature tensile strength of the welding strip is improved, and the manufacturing requirements of AP1000 and AP1400 nuclear power equipment are satisfied.
Description
technical field [0001] The invention relates to a welding material, in particular to a stainless steel submerged arc welding strip. Background technique [0002] The manufacture of AP1000 and AP1400 nuclear power equipment has put forward many new requirements for welding technology. For example, the surfacing welding of the stainless steel strip inner wall of the pressure vessel, pressurizer and lower head of the evaporator in the nuclear first-level equipment needs to examine the tensile properties. The welding method For submerged arc welding, the welding material is EQ308L welding strip + matching submerged arc flux, and the surfacing metal needs to undergo heat treatment (heat treatment temperature is 595 ° C ~ 620 ° C), and the design requires the room temperature tensile strength of the deposited metal after welding and heat treatment All ≥ 520MPa. The tensile strength of existing welding materials after welding and heat treatment cannot meet the technical requiremen...
Claims
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IPC IPC(8): B23K35/30
CPCB23K35/308B23K9/186
Inventor 徐锴顾国兴陈波黄逸峰邹力维景益王纯余燕郑庆铭张俊宝张昕
Owner HARBIN WELDING INST LTD
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