ASTM A500 khoom yog dab tsi?
ASTM A500 yog tus qauv kev qhia tshwj xeeb tshaj tawm los ntawm American Society for Testing and Materials (ASTM) rau txias- ua welded thiab seamless carbon steel qauv raj. Nws cov ntsiab lus tseem ceeb yog raws li nram no:
1. Scope:
- Npog txias- tsim welded thiab seamless carbon steel puag ncig, square, rectangular, los yog irregularly zoo li tus qauv raj siv nyob rau hauv welded, riveted, los yog bolted kev twb kev txuas rau txuas hniav thiab vaj tse, raws li zoo raws li rau kev siv cov qauv siv.
2. Kev txwv qhov loj:
- Cov raj nrog ib ncig ntawm 88 ntiv tes (2235 hli) lossis tsawg dua, thiab cov phab ntsa tuab ntawm 0.875 nti (22 hli) lossis tsawg dua.
3. Steel Qib Classification thiab Requirements:
- Qib A: Cov ntsiab lus carbon ntau dua, nrog rau qee qhov kev xav tau lub zog, haum rau cov qauv siv dav dav uas yuav tsum muaj zog tsis yog siab tshwj xeeb.
- Qib B: Muab piv rau Qib A, muaj zog ntxiv, tsim nyog rau cov khoom siv nrog lub zog siab dua.
- Qib C: Muaj lub zog siab thiab zoo toughness, haum rau cov qauv raug hnyav.
- Qib D: Yuav tsum tau kho cua sov kom ua tau raws li qhov yuav tsum tau muaj zog dua thiab toughness, feem ntau yog siv rau hauv cov khoom siv nrog cov khoom siv nruj heev. Rau cov raj square thiab cov duab plaub, qhov kev xav tau lub zog ntawm txhua qib siab dua rau cov raj puag ncig.
4. Chemical Composition (%)
| Qib | Cov pa roj carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) |
|---|---|---|---|---|---|
| Gr. A | Tsawg dua lossis sib npaug li 0.25 | Tsawg dua lossis sib npaug li 0.95 | Tsawg dua lossis sib npaug li 0.035 | Tsawg dua lossis sib npaug li 0.035 | Tsawg dua lossis sib npaug li 0.10 |
| Gr. B | Tsawg dua lossis sib npaug li 0.26 | Tsawg dua lossis sib npaug li 1.35 | Tsawg dua lossis sib npaug li 0.035 | Tsawg dua lossis sib npaug li 0.035 | Tsawg dua lossis sib npaug li 0.10 |
| Gr. C | Tsawg dua lossis sib npaug li 0.23 | Tsawg dua lossis sib npaug li 1.40 | Tsawg dua lossis sib npaug li 0.035 | Tsawg dua lossis sib npaug li 0.035 | Tsawg dua lossis sib npaug li 0.10 |
5. Mechanical Properties
| Qib | Yield zog (MPa) | Tensile zog (MPa) | Elongation (%) |
|---|---|---|---|
| Gr. A | Ntau dua lossis sib npaug li 228 | 310-430 | Ntau dua lossis sib npaug li 20 (gauge ntev 50mm) |
| Gr. B | Ntau dua lossis sib npaug li 290 | 345-450 | Ntau tshaj los yog sib npaug rau 20 |
| Gr. C | Ntau dua lossis sib npaug rau 315 | 380-480 | Ntau dua lossis sib npaug li 18 |
6. Kev Ua Haujlwm Zoo Ntxiv
| Cov khoom kuaj | Kev xav tau | Sau ntawv |
|---|---|---|
| Khoov | Pass standard dabtsi yog khoov kuaj | Xyuas kom tsis txhob tawg thaum lub caij txias khoov. |
| Impact Toughness | Optional, negotiable | Haum rau qis- kub lossis seismic daim ntawv thov. |
A500 Tus Qauv Tube hauv Tshuag
