介在物形態球化控制及其在改進鋼板性質上之應用

Spheroidization in Shape-control of Inclusions and Its Applications in The Improvement of Steel Plate Properties

陳溪鎔(Shi-Rong Chen) ； 魏豐義(Feng-I Wei) ； 劉宏義(Horng-Yih Liou) ； 周倉榮(Chang-Long Chou)

《鑛冶：中國鑛冶工程學會會刊》 34卷1期 (1990/03) Pp. 41-52

https://doi.org/10.30069/MM.199003_34(1).0004

摘要

煉鋼製程藉着Ca-Si粉末吹射或Ca-Si合金線添加進行加鈣處理，可有相當良好的介在物形態控制效果，能將傳統鋼材中的長條狀硫化錳（MnS）介在物球化。鋼板韌性劣化尤其與MnS介在物形狀有關。本研究發現加鈣處理使介在物球化程度完全，可顯著提高鋼板抗氫脆化與抗硫化物應力腐蝕之能力。同時，介在物球化的效果亦可消除鋼板方向性，明顯提昇母材和銲道熱影響區的韌性。研究結果顏示鋼液加鈣處理製程為提昇鋼板耐蝕性和耐銲性的關鍵製程。因此建議油管用鋼、船用鋼板、壓力容器用鋼、耐候鋼和耐海水腐蝕鋼等應以加鈣處理之煉鋼製程來生產。

並列摘要

In steel making process, the calcium treatment via Ca-Si powder injection or Ca-Si wire feeding has a prominent effect on the morphologic control of non-metallic inclusions. The stringer-shaped MnS inclusions in conventional steel can be changed into the spheroidal shape. The sensitivity of toughness and hydrogen induced cracking (HIC) of steel plate are strongly related to the shape of MnS inclusions. This work finds that the inclusions can be completely spheroidized by calcium treatment to significantly increase the resistance of hydrogen induced cracking and sulfide stress corrosion cracking in steel plates. At the same time, the spheroidal inclusions are effective in diminishing the anisotropy of impact test and in improving transverse toughness of steel plates in the heat affect zone of weldment. All of the results indicate that the calcium treatment. in steelmaking is the key process for the anticorrosion property and weldability for the steel plates. Thus, the process of calcium treatment is recommended and should be applied to produce line pipe steels, ship plates for high heat in put welding, pressure vessel steels, weathering steels, and seawater corrosion resistant steels, etc.