1. Boiled steel phaj yog steel phaj ua los ntawm kub dov zoo tib yam carbon structural steel thiab boiled hlau. Boiling steel yog ib hom hlau uas tsis tiav deoxidation. Tsuas yog qee qhov ntawm cov deoxidizer tsis muaj zog yog siv los deoxidize cov hlau molten. Cov hlau molten muaj cov pa oxygen siab. Thaum cov hlau molten raug txhaj rau hauv cov hlau ingot pwm, cov pa roj carbon-oxygen cov tshuaj tiv thaiv ua rau muaj roj ntau, ua rau cov hlau molten boil. , los ntawm uas boiling steel tau txais nws lub npe. Cov ntsiab lus carbon ntawm boiling steel yog tsawg. Txij li thaum ferrosilicon deoxidation tsis tas yuav tsum tau, cov ntsiab lus silicon hauv cov hlau kuj tsawg (Si<0.07%). The outer layer of boiling steel is crystallized under the conditions of violent stirring of liquid steel caused by boiling. Therefore, the surface layer is pure and dense, with good surface quality, good plasticity and stamping performance, and no large concentrated shrinkage holes or cut ends. Less, high yield rate, simple boiling steel production process, less ferroalloy consumption, and low steel cost. Boiled steel plates are widely used in the manufacture of various stamping parts, construction and engineering structures and some less important machine structural parts. However, there are more impurities in the core of boiling steel, the segregation is more serious, the structure is not dense, and the mechanical properties are uneven. At the same time, due to the high gas content in steel, the toughness is low, the cold brittleness and aging sensitivity are high, and the welding performance is also poor. Therefore, boiled steel plates are not suitable for manufacturing welded structures and other important structures that bear impact loads and work under low temperature conditions.
2. Killed steel phaj yog steel phaj ua los ntawm kub dov ntawm cov pa roj carbon zoo tib yam steel thiab tua hlau. Cov hlau tua yog cov hlau deoxidized tag nrho. Lub molten hlau yog tag nrho deoxidized nrog ferromanganese, ferrosilicon thiab txhuas ua ntej pouring. Cov pa oxygen cov ntsiab lus ntawm cov hlau molten yog tsawg (feem ntau 0.002-0.003%), thiab cov hlau molten kuj nyob twj ywm nyob rau hauv cov pwm ingot. Tsis muaj qhov tshwm sim npau taws, yog li lub npe ntawm cov hlau tua. Raws li kev ua haujlwm ib txwm muaj, tsis muaj npuas hauv cov hlau tua, thiab cov qauv zoo li qub thiab ntom; vim cov ntsiab lus tsis tshua muaj oxygen, muaj tsawg dua cov oxide suav nrog hauv cov hlau, siab dua purity, thiab tsis txias brittleness thiab aging nyiam; Nyob rau tib lub sijhawm, kev sib cais ntawm cov hlau tua yog me me, qhov kev ua tau zoo yog qhov sib xws thiab qhov zoo yog siab. Qhov tsis zoo ntawm cov hlau tua yog cov kab noj hniav uas muaj zog, tsis tshua muaj txiaj ntsig, thiab tus nqi siab. Yog li ntawd, cov hlau tua yog tsuas yog siv rau cov khoom uas tiv taus qhov kub thiab txias, cov qauv welded thiab lwm yam khoom uas yuav tsum tau muaj zog dua.
Tsawg alloy steel daim hlau yog ob leeg tua steel thiab semi-tua steel daim hlau. Vim nws lub zog siab thiab kev ua tau zoo dua, nws tuaj yeem txuag tau ntau cov hlau thiab txo qhov hnyav ntawm cov qauv, thiab nws daim ntawv thov tau dhau los ua ntau dua.
