1. Kev faib tawm los ntawm txoj kev smelting
Qhib hearth steel
Hloov steel
Hluav taws xob cua sov steel
2. Kev faib tawm los ntawm cov tshuaj muaj pes tsawg leeg
(1) carbon hlau
Tsawg carbon steel
Hlau nrog cov ntsiab lus carbon tsawg dua 0.25%
Nruab nrab carbon steel
Hlau nrog cov ntsiab lus carbon ntawm 0 25-0.60%
High carbon hlau
Hlau nrog cov ntsiab lus carbon ntau dua 0.60%
(2) Cov hlau tsis tshua muaj hlau
(3) Alloy hlau
Tsawg alloy steel
Hlau nrog tag nrho cov ntsiab lus alloying tsawg dua 5%
Medium alloy hlau
Hlau nrog tag nrho cov ntsiab lus alloying ntawm 5-10%
High alloy hlau
Hlau nrog tag nrho cov ntsiab lus alloying ntau dua 10%
3. Kev faib tawm los ntawm lub hom phiaj
Cov qauv hlau
Mechanical Steel
Kev tsim kho hlau
Cov cuab yeej steel
Cov hlau tshwj xeeb
