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日本海事新聞ニュース Japan Maritime Daily Dec 08, 2025 (Mon)

Mitsubishi Shipbuilding and Nippon Steel Secure World’s First GDA from Class NK for New Low-Pressure LCO2 Tank Technology

Image of low-pressure LCO2 tank installed

　On December 5, Mitsubishi Heavy Industries Group’s Mitsubishi Shipbuilding and Nippon Steel Corpora ・・・続きはログインして下さいnext %E3%80%80On+December+5%2C+Mitsubishi+Heavy+Industries+Group%E2%80%99s+Mitsubishi+Shipbuilding+and+Nippon+Steel+Corporation+announced+that+they+have+jointly+developed+a+technology+that+will+eliminate+post-weld+heat+treatment+%28PWHT%29+by+adopting+steel+developed+by+Nippon+Steel+Corporation+for+the+tanks+of+low-pressure+LCO2+%28liquefied+carbon+dioxide%29+transport+ships+and+evaluating+the+integrity+of+welds+using+a+method+called+ECA+%28Engineering+Critical+Assessment%29.+It+has+received+General+Design+Approval+%28GDA%29+from+ClassNK+%28NK%29+and+is+the+world%E2%80%99s+first+such+approval+in+this+field.+%3Cbr%3E%E3%80%80When+economical+high-strength+carbon+manganese+steel+is+used+in+the+manufacture+of+large+LCO2+tanks%2C+PWHT+is+normally+required+for+the+welds+in+accordance+with+the+provisions+of+the+IGC+Code+%28International+Code+relating+to+the+construction+and+equipment+of+ships+for+the+transport+of+liquefied+gas+in+bulk%29.+However%2C+because+there+are+only+a+limited+number+of+heat+treatment+furnaces+capable+of+accommodating+large+tanks%2C+this+manufacturing+process+has+been+a+challenge+for+large-scale+mass+production+of+tanks.+%3Cbr%3E%E3%80%80In+response%2C+Mitsubishi+Shipbuilding+carried+out+an+ECA%2C+taking+into+account+the+characteristics+of+the+steel+material+developed+by+Nippon+Steel+Corporation.+Based+on+the+evaluation+results%2C+the+validity+of+the+manufacturing+process+that+eliminates+PWHT+was+demonstrated%2C+and+GDA+was+obtained.+%3Cbr%3E%E3%80%80In+order+to+realize+the+PWHT+omission+technology+developed+by+Mitsubishi+Shipbuilding+for+large+low-pressure+LCO2+tanks%2C+Nippon+Steel+Corporation+has+developed+a+steel+material+that+conforms+to+the+NK+standard+material+%E2%80%9CKF460%E2%80%9C+steel%2C+but+has+better+low-temperature+properties%2C+high+strength%2C+and+is+also+economical.+%3Cbr%3E%E3%80%80Based+on+this+achievement%2C+the+two+companies+will+collaborate+with+companies+involved+in+the+supply+chain+for+LCO2+tank+manufacturing.+They+aim+to+commercialize+large+low-pressure+LCO2+tanks+and+newly+developed+steel+materials.+%3Cbr%3E%E3%80%80The+GDA+is+issued+as+proof+of+conformity+with+requirements+after+examining+the+design+based+on+existing+regulations+such+as+international+treaties+and+classification+society+rules%2C+and+is+applied+to+general-purpose+products+that+are+in+the+detailed+design+stage.+%3Cbr%3E%3Cbr%3E%3Cbr%3E%3Cbr%3EDisclaimer%3A+The+English+translations+provided+through+this+service+are+the+result+of+translations+made+by+The+Japan+Maritime+Daily+or+automatically+and+mechanically+translated+by+The+Japan+Maritime+Daily+using+an+automated+translation+system+provided+by+a+third+party+after+certain+processing+of+the+Japanese+content+licensed+by+the+third+party.+In+terms+of+the+English+translation%2C+The+Japan+Maritime+Daily+and+MarineNet+Co.%2C+Ltd.+make+no+warranty+or+burden+of+any+kind%2C+express+or+implied%2C+including+its+accuracy%2C+reliability%2C+validity+or+fitness+for+a+particular+purpose.+MarineNet+Users+should+fully+understand+that+this+service+uses+an+automated+translation+system+that+automatically+and+mechanically+recognizes+and+analyzes+information+and+produces+results.+The+users+should+understand+the+above+conditions+before+using+this+service.%3Cbr%3E%3Cbr%3E%E5%85%8D%E8%B2%AC%E4%BA%8B%E9%A0%85%EF%BC%9A%E3%81%93%E3%81%AE%E3%82%B5%E3%83%BC%E3%83%93%E3%82%B9%E3%82%92%E4%BB%8B%E3%81%97%E3%81%A6%E6%8F%90%E4%BE%9B%E3%81%95%E3%82%8C%E3%82%8B%E8%8B%B1%E8%A8%B3%E3%81%AF%E3%80%81%E6%97%A5%E6%9C%AC%E6%B5%B7%E4%BA%8B%E6%96%B0%E8%81%9E%E3%81%8C%E4%BD%9C%E6%88%90%E3%81%99%E3%82%8B%E3%81%8B%E3%80%81%E5%8F%88%E3%81%AF%E3%80%81%E7%AC%AC%E4%B8%89%E8%80%85%E3%81%8B%E3%82%89%E4%BD%BF%E7%94%A8%E8%A8%B1%E8%AB%BE%E3%82%92%E5%8F%97%E3%81%91%E3%81%9F%E6%97%A5%E6%9C%AC%E8%AA%9E%E3%81%AE%E3%82%B3%E3%83%B3%E3%83%86%E3%83%B3%E3%83%84%E3%82%92%E3%80%81%E6%97%A5%E6%9C%AC%E6%B5%B7%E4%BA%8B%E6%96%B0%E8%81%9E%E3%81%8C%E4%B8%80%E5%AE%9A%E3%81%AE%E5%87%A6%E7%90%86%E3%82%92%E8%A1%8C%E3%81%A3%E3%81%9F%E4%B8%8A%E3%81%A7%E3%80%81%E7%AC%AC%E4%B8%89%E8%80%85%E3%81%8C%E6%8F%90%E4%BE%9B%E3%81%99%E3%82%8B%E8%87%AA%E5%8B%95%E7%BF%BB%E8%A8%B3%E3%82%B7%E3%82%B9%E3%83%86%E3%83%A0%E3%82%92%E5%88%A9%E7%94%A8%E3%81%97%E3%81%A6%E8%87%AA%E5%8B%95%E7%9A%84%E3%83%BB%E6%A9%9F%E6%A2%B0%E7%9A%84%E3%81%AB%E7%BF%BB%E8%A8%B3%E3%81%97%E3%81%9F%E7%B5%90%E6%9E%9C%E3%81%A7%E3%81%82%E3%82%8A%E3%80%81%E6%97%A5%E6%9C%AC%E6%B5%B7%E4%BA%8B%E6%96%B0%E8%81%9E%E3%80%81%E3%83%9E%E3%83%AA%E3%83%B3%E3%83%8D%E3%83%83%E3%83%88%E3%81%AF%E3%80%81%E5%BD%93%E8%A9%B2%E8%8B%B1%E8%A8%B3%E3%81%AB%E9%96%A2%E3%81%97%E3%81%A6%E3%80%81%E3%81%9D%E3%81%AE%E6%AD%A3%E7%A2%BA%E6%80%A7%E3%80%81%E4%BF%A1%E9%A0%BC%E6%80%A7%E3%80%81%E5%A6%A5%E5%BD%93%E6%80%A7%E5%8F%8A%E3%81%B3%E7%89%B9%E5%AE%9A%E7%9B%AE%E7%9A%84%E3%81%B8%E3%81%AE%E9%81%A9%E5%90%88%E6%80%A7%E3%82%92%E5%90%AB%E3%82%81%E3%80%81%E6%98%8E%E7%A4%BA%E5%8F%88%E3%81%AF%E9%BB%99%E7%A4%BA%E3%81%AB%E3%82%82%E3%80%81%E3%81%84%E3%81%8B%E3%81%AA%E3%82%8B%E4%BF%9D%E8%A8%BC%E3%82%82%E3%81%97%E3%81%BE%E3%81%9B%E3%82%9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