1. Cov ntsiab lus tseem ceeb (qhov tseem ceeb rau lub zog & muaj peev xwm)
Cov pa roj carbon (c): Tsawg dua los yog sib npaug rau 0.12%
Lawb tsawg kom ntseeg tau zoo weldability thiab ductility thaum muab kev pab muaj zog txaus.
Silicon (si): 0.15–0.50%
Txhim kho lub zog thiab deoxidation thaum lub sij hawm steelmaking; Pab txhawb kom xeb cov txheej txheem ruaj khov.
Manganese (MN): 0.90–1.50%
Txhim kho cov khoom siv tawv thiab tawv; Cov sib npaug ntawm cov txiv lws meem tsis zoo.
Phosphorus (p): Tsawg dua los yog sib npaug rau 0.030%
Kev tswj kom tsis txhob muaj brittleness tab sis ib nyuag tsa me ntsis piv rau cov roj carbon hlau rau corrosion tsis kam.
Sulphur (s): Tsawg dua los yog sib npaug rau 0.025%
Tsawg tsawg los tiv thaiv cov kev tawg kub thaum vuam.
2. Weathering alloying ntsiab (tseem ceeb rau corrosion tsis kam)
Tooj liab (Cu): 0.25–0.55%
Qhov tseem ceeb tshaj plaws rau cov atmospheric corrosion tsis kam; Txhawb cov ntom ntom, cov txheej txheem xeb kev tsim.
Chromium (CR): 0.40–0.80%
Txhim kho cov oxidation tsis kam thiab ua kom muaj kev tiv thaiv patina.
Nickel (NI): Tsawg dua los yog sib npaug rau 0.65%
Txhim kho kev nruj thiab corrosion kuj, tshwj xeeb tshaj yog nyob rau hauv acidic lossis marine ib puag ncig.
(Yeem ntxiv rau qee qib:Vanadium (V)lossisMolybdenum (mo)Rau micro - alloy ntxiv dag zog.)
3. Kev tsis txaus siab & cov chaw nyob (nruj me ntsis tswj)
Aluminium (Al):Ntxiv rau deoxidation (feem ntau tsawg dua los yog sib luag rau 0.015%).
Nitrogen (n):Txwv tsawg dua li tsawg dua lossis sib npaug rau 0.015% kom tsis txhob muaj kev laus.
4. Carbon sib npaug (CEV) & Weldability
CEV (IIW cov mis): ~0.40–0.45
Siab dua Q235NH / Q355Snh vim muaj cov ntsiab lus alloy; tej zaum yuav xav tauPreheating (100-150 degree)Rau tuab -}}}}} section vuam.
