メタノール溶液中の応力腐食割れにおよぼす低炭素鋼板冶金的因子の影響

概要

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Studies were carried out on the effects of chemical composition, manufacturing condition and heat-treatment of low carbon rimmed hot rolled steel sheets on susceptibility to stress corrosion cracking in 60℃ reagent methanol containing 0.01 wt% formic acid and 0.1 wt% water by using a constant strain rate test. Similar studies were done for various cold rolled steel sheets and pure iron sheets. Carbon content (0.001-0.12 wt%) did not affect the susceptibility. Chromium additions (0.04 wt% and over) increased the resistance to cracking, whereas temper rolling and lower coiling temperature of hot rolled sheets decreased the resistance. Also the higher cooling rate of steel sheet cooled from austenite region and low temperature heat treatments (100-300℃×5h) decreased the resistance. The effect of strain rate on the SCC susceptibility of a bent or straight form specimen in the methanol solution was investigated. It was found that the both specimens showed SCC at the strain rate ε=10^<-4>-10^<-5> see^<-1> and the cracking depth observed in the bent specimen (max 0.28 mm) was greater than that in the straight specimen (max 0.05 mm). The same SCC as that in the methanol solution was observed in reagent ethanol (C_2H_5OH), methyl cellosolve (H_3COC_2H_4OH), and ethylene glycol (C_2H_4(OH)_2) containing formic or acetic acid and water.
社団法人日本鉄鋼協会の論文
1977-05-01