ASTM muaj peb tus qauv tseem ceeb tswj hwm cov kab sib txuas nrog GB / T 702 (GB kub- dov puag ncig bar tus qauv), npog cov khoom, qhov ntev, thiab zoo:
1. ASTM A36 / A36M-22 (Cov khoom siv rau Carbon Steel Round Bars)
Sib npaug rau GB Q235B, qhia meej:
Lub zog: 248 MPa tawm los, 400–545 MPa tensile-aligning nrog Q235B cov khoom.
Chemistry: Carbon (max 0.25%), Mn (0.80–1.35%), P/S (max 0.040%)- sib haum nrog Q235B cov ntsiab lus.
Daim ntawv thov: Lub teeb qhov chaw (piv txwv li, laj kab ncej, bracket pins) qhov twg Q235B feem ntau siv.
2. ASTM A572 / A572M-22 (Cov khoom siv rau HSLA Round Bars)
Sib npaug rau GB Q355B, npog siab -lub zog qis- alloy tuav:
Qib 50: 345 MPa yield, 448–586 MPa tensile-matching Q355B's 355 MPa (tsawg dua lossis sib npaug rau 16 mm) thiab 470–630 MPa.
Chemistry: Carbon (max 0.23%), Mn (1.00–1.65%), P/S (max 0.035%)-ze li zoo tib yam rau Q355B.
3. ASTM A6/A6M-22 (Qhov Kev Ua Tau Zoo rau Cov Kub Rolled Bars)
Ncaj nraim nrog GB / T 702 qhov kev xav tau loj:
| Txoj kab uas hla | ASTM A6 Kev kam rau siab | GB/T 702 kam rau ua | Kev cuam tshuam |
|---|---|---|---|
| Tsawg dua los yog sib npaug li 20 mm | ± 0.3 hli | ± 0.3 hli | Ib yam - haum GB fastener qhov (piv txwv li, M16 bolts siv 20 mm tuav). |
| 20-50 hli | ± 0.4 hli | ± 0.4 hli | Tib yam rau shafts (piv txwv li, 30 mm bar haum GB bearing vaj tse). |
| 50-100 hli | ± 0.5 hli | ± 0.5 hli | Tsis muaj machining xav tau rau cov qauv pins (xws li, 80 mm bar rau beam txhawb). |
ASTM A6 kuj sib xws GB / T 702 qhov ntev kam rau ua (± 50 hli rau 6-12 m), ua kom cov tuav kom haum cov kab sib dhos yam tsis muaj kev txiav ntxiv. Ua ke, cov qauv no ua kom ASTM round bars sib txuas ua ke rau hauv GB tsim.