1. Jirgin ruwa amfani da bututu (GB5213-85) ne carbon karfe seamless bututu don samar da jirgin ruwa I matakin matsin lamba juriya bututu tsarin, II matakin matsin lamba juriya bututu tsarin, boiler da kuma overheater. Carbon karfe seamless bututu bangon aiki zafin jiki ba fiye da 450 ℃, da kuma gami karfe seamless bututu bangon aiki zafin jiki fiye da 450 ℃.2.　　GB5312-1999(Jirgin ruwa da carbon karfe da kuma carbon manganese karfeSeamless karfe bututu）. Yawancin amfani da jirgin ruwa boilers da kuma overheaters I, II matakin matsin lamba juriya bututu, da dai sauransu. Yana wakiltar kayan 360, 410, 460 karfe da sauransu.3. Karfe bututun nauyi lissafi formula: [(waje diamita - bango kauri) * bango kauri] * 0.02466 = kg / m (nauyi a kowace mita)