Feem ntau yog siv rau cov qauv dav dav thiab cov qauv siv tshuab. (Seamless steel kav rau qis thiab nruab nrab siab boilers) yog ib tug high-zoo carbon siv los tsim superheated chav kav, boiling dej kav rau tsawg thiab nruab nrab siab boilers ntawm ntau yam lug, thiab superheated chav kav rau locomotive boilers, loj pa luam yeeb kav, me me. Cov kav dej haus luam yeeb thiab cov kav cib kav Cov qauv steel kub-dov thiab txias-draw (dov) seamless steel hlab. Cov ntaub ntawv sawv cev yog 10 thiab 20 steel. 4.GB5310-1995 (Seamless steel tubes rau high-pressure boilers) yog seamless steel raj ntawm high-zoo carbon steel, alloy steel thiab stainless kub-resistant steel rau cov cua kub saum npoo ntawm dej raj boilers nrog siab siab thiab saum toj no. Cov ntaub ntawv sawv cev yog 20G, 12Cr1MoVG, 15CrMoG, thiab lwm yam 5. GB1479-2000 (Seamless steel yeeb nkab rau high-pressure fertilizer cov cuab yeej) yog ib tug high-zoo carbon structural steel thiab alloy steel seamless steel yeeb nkab haum rau cov khoom siv tshuaj thiab cov kav dej nrog kev ua haujlwm. Qhov kub ntawm -40 txog 400 ℃ thiab ua haujlwm siab ntawm 10 txog 30 Ma.
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