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| Application of oxide metallurgy in high heat input welding steels |
| WANG Bingxing，ZHU Fuxian，WANG Chao，LOU Haonan，#br#
WANG Zhaodong，WANG Guodong |
| (State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang 110819， Liaoning， China) |
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Abstract In order to analyze the nucleation ability and different kinds of inclusions in oxide metallurgy steel and its effect on the improvement of high heat input welding properties，simulated welding thermal cycle on TiCa and TiMg steels were executed and industrial production by oxide metallurgy has been carried out. It was showed that the movement of austenite grain boundaries was retarded by TiMg oxides at 1 400 ℃ and held for 30 s. Acicular ferrites were also induced at cooling process. In order to keep the oxygen content of oxide metallurgy technology， SiMn predeoxidation and TiMg deoxidation process was built. EH420 experimental steel produced by new process with excellent welding ability， which can bear heat input of 200 kJ/cm by electrogas welding. Impact energy of HAZ at -40 ℃ was 200 J and numerous acicular ferrite plates were formed in the welded joint.
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