ボロン添加SUS 304鋼の溶接高温割れ感受性評価

概要

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The hot cracking susceptibility of weld made on SUS 304 stainless steel modified from 0.2 to 1.0 mass% B has been investigated. Varestraint tests showed that the hot cracking susceptibility is high for boron additions of about 0.2%, but is decreased when the boron content is increased to >0.5%. Steels containing about 0.2% B were found to have a wide solidification temperature ductility was low compared with boron free SUS 304 steel and the other boron modified steels. Increasing the boron content to 0.6% reduces the coefficient of thermal expansion and narrows the solidification temperature range. In addition, crack refilling was observed, resulting in improved hot ductility and high resistance to hot cracking. It is concluded that in structures where weld restraint forces are not high, hot cracking is not likely to occur if boron additions of >0.6% are made to SUS 304 stainless steel.
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