09MnNiDR低温钢管双面双层三丝自动埋弧焊接研究

Study on Double-sided & Double-layered 3-wire Automatic SAW Process for 09MnNiDR Cryogenic Steel Pipe

介绍了09MnNiDR低温钢管的焊材、焊接方法、后续热处理以及检测工艺的选择和试制情况.认为：09MnNiDR低温钢管的质量取决于焊材和焊接能量,选取焊丝CHW-S13、焊剂CHF105DR,并遵守热输入优先控制原则,其焊缝具有稳定的抗低温冲击性能;在JCOE生产线上采用双面多丝埋弧焊,可起到多道焊接的效果,细化晶粒,得到针状铁素体;采用保温温度590～620℃、保温时间60 min、300℃以下出炉空冷的后续热处理,可提高焊接接头的性能.

Elaborated in the article are the main aspects about manufacturing of the 09MnNiDR cryogenic steel pipe, including welding material, welding method, follow-up heat treatment, determination of inspection/testing processes, and the trail production activities, etc. It is regarded that quality of the said low temperature steel pipe depends on such elements as welding material, welding energy, adoption of CHW-S13 weld wire and CHF105DR weld agent, and observation of the principle of taking heat input control as the priority. As a result, the pipe weld seam possesses stable anti-low temperature impact property. Owing to the double-sided and multi-wire SAW process as performed on the JCOE operation line, multi-pass welding of the pipe is realized, and accordingly, grains of the metal are refined, and acicular ferrite structure is developed. Moreover, properties of the weld joint will be improved by means of the follow-up heat treatment of off-furnace air cooling under the conditions as 590-620 ℃ holding temperature, 60 minutes holding time, and 300 ℃ furnace outlet temperature.