20 # seamless steel yeeb nkab yog cov pa roj carbon tsawg. Cov pa roj carbon steel feem ntau muab faib ua peb hom: carbon steel tsawg, nruab nrab carbon steel thiab siab carbon steel. Ntawm lawv, 45 # steel yog nruab nrab carbon steel, thiab hlau hauv qab 45 # yog cov pa roj carbon tsawg. Hlau saum 45 # yog cov hlau tsis muaj carbon. 45 # yog carbon hlau. Yog tias tsis muaj cov cai tshwj xeeb rau cov kav dej seamless, 20 # seamless steel kav feem ntau siv.
20 # seamless steel yeeb nkab yog ua los ntawm 20 # steel, nrog me ntsis siab zog tshaj 15 #, me ntsis quenching, thiab tsis muaj temper brittleness. Nws muaj qhov txias deformation plasticity thiab feem ntau yog siv rau khoov, dov, flanging thiab rauj arching. Nws muaj qhov ua tau zoo ntawm kev siv vuam hauv arc vuam thiab tiv tauj vuam. Lub thickness yog me me thaum lub sij hawm siv roj welding thiab cov kab nrib pleb yog nquag tshwm sim ntawm qhov chaw uas yuav tsum tau nruj me ntsis los yog complex duab. Lub caij txias los yog lub xeev normalized muaj kev ua haujlwm zoo dua li lub xeev annealed, thiab feem ntau yog siv los tsim cov khoom ua haujlwm uas tsis tshua muaj kev ntxhov siab thiab siab toughness.
chemical muaj pes tsawg leeg:
Cov pa roj carbon C: 0.17% -0.20%
Silicon Si: 0.17% -0.37%
Manganese Mn: 0.35% -0.65%
Sulfur S: Tsawg dua lossis sib npaug rau 0.035%
Phosphorus P: Tsawg dua lossis sib npaug rau 0.035%
Chromium Cr: Tsawg dua lossis sib npaug rau 0.25%
Nickel Ni: Tsawg dua lossis sib npaug rau 0.25%
Copper Cu: Tsawg dua lossis sib npaug rau 0.25%
Mechanical zog:
Tensile zog σb (MPa): Ntau dua lossis sib npaug rau 410 (42)
Yield zog σs (MPa): Ntau dua lossis sib npaug rau 245 (25)
Elongation δ (%): Ntau dua lossis sib npaug rau 25
Kev txo qis ntawm cheeb tsam ψ (%): Ntau dua lossis sib npaug rau 5,
Hardness: tsis kho cua sov, Tsawg dua los yog sib npaug rau 156HB,
Qauv loj: Qauv loj 25mm
Kev kho cua sov specifications thiab metallographic qauv:
Kev kho cua sov specifications: normalizing, 910 degree, cua txias.
Metallographic qauv: ferrite + pearlite.
Kev xa khoom: Kev xa khoom tsis muaj kev kho cua sov lossis kev kho cua sov (annealing, normalizing lossis kub tempering).
Yog tias cov khoom yuav tsum tau muab xa mus rau hauv lub tshav kub-kho, nws yuav tsum tau teev nyob rau hauv daim ntawv cog lus. Yog tias nws tsis tau teev, nws yuav raug xa mus yam tsis muaj kev kho cua sov.
