** 1. Dab tsi yog ASTM A572 cov khoom siv? **
ASTM A572 yog qhov tshwj xeeb rau lub siab-zog qis-alloy (hsla) qauv hlau. Nws yog feem ntau siv hauv kev tsim kho, txuas hniav, hloov cov yees, thiab lwm yam kev siv hluav taws xob vim nws lub zog txhim kho, thiab corrosion tsis kam piv rau cov hlau A36. Nws muaj me me ntawm alloy cov ntsiab (xws li, columbium, vanadium) kom txhim kho cov khoom siv neeg kho tshuab.
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** 2. Dab tsi yog ASTM A572 sib npaug rau? **
ASTM A572 yog qhov sib npaug dav rau:
- ** Rau (Europe): ** S355j2 (lub zog zoo sib xws thiab tshuaj lom neeg).
- ** JIS (Nyiv): ** SM490.
- ** ISO: ** QIB355.
Muaj kev sib npaug raws li cov qauv qib thiab cheeb tsam, yog li hloov chaw ncaj qha yuav tsum tau ua kom zoo sib piv ntawm cov neeg kho tshuab thiab tshuaj siv tshuaj.
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** 3. Dab tsi yog qhov sib txawv ntawm Astm A36 thiab ASTM A572? **
- ** Lub zog: ** A572 muaj ntau dua cov txiaj ntsig thiab cov qib 50: 50 ksi tawm los) piv rau A36 (36 KSI tawm los).
- ** QIB: ** A572 yog cov hlau tsis muaj roj tsawg nrog ntxiv xws li Columbium \/ Vanadium, Thaum A36 yog cov tawv carbon hlau.
- ** COV NTAUB NTAWV: ** A36 yog siv rau cov hom phiaj txheej txheem; A572 yog qhov zoo tshaj plaws rau lub siab-zog, qhov hnyav-tseem ceeb.
- ** ** Corrosion Kuj: ** A572 muaj cov atmospheric zoo dua vim yog cov khoom siv xwb.
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** 4. Dab tsi yog astm A572 gr 42\/50? **
- ** QIB 42: ** THIB KAWG XEEM lub zog ntawm 42 KSI (290 MPA), tensile lub zog ntawm 60 ksi (415 mpa).
- ** QIB LUG 50: ** TSHEM XEEM XEEM lub zog ntawm 50 Ksi (345 MPa), tensile lub zog ntawm 65 ksi (450 mpa).
Cov qib kawm no txhais tau ntau cov zog ua haujlwm, nrog qib 50 tau ntau dua hauv cov ntawv thov kev ua haujlwm hnyav.
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** 5. Dab tsi yog qhov sib txawv ntawm A572 Qib 50 thiab qib 57 55? **
- ** BISGRIST LUB ZOG: ** Qib 50 muaj 50 Ksi (345 Mpa) paib muaj zog; Qib 55 muaj 55 ksi (380 MPa).
- ** Qib lub zog: ** Qib 50 yuav tsum tau 65 ksi (450 MPA); Qib 55 yuav tsum muaj 70 ksi (485 MPa).
- ** Cov ntawv thov: ** Qib 55 yog siv nyob rau qhov twg siab dua lub zog yog xav tau (xws li seismic-resistant qauv qauv).
- ** QUAROSITION: ** Qib 55 yuav muaj kev xav tau ib txwm ua kom tiav lub zog siab dua.
