Development of EQ309L stainless steel materials for submerged arc cladding with band-electrode in nuclear power industry

ZOU Liwei; SHEN Tiankuo; FENG Wei; CHEN Bo; XU Kai

doi:10.7512/j.issn.1001-2303.2021.06.17

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Development of EQ309L stainless steel materials for submerged arc cladding with band-electrode in nuclear power industry
Vol. 51, Issue 6, Pages: 92-97(2021)
DOI： 10.7512/j.issn.1001-2303.2021.06.17

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ZOU Liwei, SHEN Tiankuo, FENG Wei, et al. Development of EQ309L stainless steel materials for submerged arc cladding with band-electrode in nuclear power industry. [J]. 51(6):92-97(2021)
DOI：

ZOU Liwei, SHEN Tiankuo, FENG Wei, et al. Development of EQ309L stainless steel materials for submerged arc cladding with band-electrode in nuclear power industry. [J]. 51(6):92-97(2021) DOI： 10.7512/j.issn.1001-2303.2021.06.17.

摘要

通过合理调整EQ309L熔敷金属的铁素体含量,提高了长时间热处理后熔敷金属的断后伸长率;对EQ309L焊带进行控氮处理,解决了室温抗拉强度不能稳定大于等于520 MPa的难题;通过改变焊剂中碳酸盐、硅酸盐及氟化物的比例改善焊剂工艺性能,解决了表面压痕和粘渣问题。研制出的EQ309L不锈钢带极埋弧堆焊材料WEQ309HR焊带和WSJ309HR烧结焊剂,其各项性能均满足核电设备制造的要求。同时研究了焊接热输入、焊接电流和焊接速度对EQ309L熔敷金属性能的影响规律,发现该套材料具有非常宽泛的工艺参数适用性。

Abstract

By rationally adjusting the ferrite content of deposited metal on EQ309L,the elongation after fracture after long-term heat treatment is improved. The problem that tensile strength at room temperature can not be stable ≥520 MPa is solved by nitrogen-controlled treatment of EQ309L welding strip;by changing the ratio of carbonate,silicate and fluoride in welding flux,the process performance of welding flux is improved and the surface indentation and slag problem are solved. All performances of developed EQ309L stainless steel materials for submerged arc cladding with band-electrode,WEQ309 HR welding strip and WSJ309 HR agglomerated flux meet the requirements of nuclear power equipment manufacturing.Meanwhile,the influence rules of welding heat input,welding current and welding speed on the properties of EQ309L deposited metal are studied,and it is found that the material has a very wide range of process parameters applicability.