A516 GR 60 thiab A516 GR 70 yog boiler / siab lub nkoj steel daim hlau sib txawv ntawm lub zog, nrog GR 70 muaj zog tensile thiab yield zog (zoo tagnrho rau kev kub siab) vim siab dua carbon / manganese cov ntsiab lus, thaum GR 60 muaj zoo ductility thiab formability (zoo dua rau nruab nrab siab / qis zog, ob qho tib si zoo) tawv.
Kev sib piv tshuaj lom neeg
|
Element |
ASTM A516 GR 70 (% los ntawm qhov hnyav) |
ASTM A516 GR 60 (% los ntawm qhov hnyav) |
|---|---|---|
|
Cov pa roj carbon (C) |
0.27 max |
0.21 max |
|
Manganese (Mn) |
0.85–1.20 |
0.60–1.20 |
|
Phosphorus (P) |
0.035 max |
0.035 max |
|
Sulfur (S) |
0.035 max |
0.035 max |
|
Silicon (Si) |
0.15–0.40 |
0.15–0.40 |
|
Aluminium (Al) |
0.02 min (rau cov hlau tua) |
0.02 min (rau cov hlau tua) |
|
Hlau (Fe) |
Tshuav |
Tshuav |
Mechanical Properties Sib piv
|
Khoom |
ASTM A516 GR 70 |
ASTM A516 GR 60 |
|---|---|---|
|
Tensile zog |
485-620 MPa (70-90 ksi) |
415-550 MPa (60-80 ksi) |
|
Yield zog (min) |
260 MPa (38 ksi) |
220 MPa (32 ksi) |
|
Elongation (min, 200 hli) |
17% |
21% |
|
Elongation (min, 50 hli) |
21% |
25% |
|
Hardness (HB, raug) |
140-200 HB |
120–165 HB |
|
Impact Toughness (Charpy V-notch) |
Ua tau raws li ASTM cov cai ntawm -46 degree |
Ua tau raws li ASTM cov cai ntawm -51 degree |
Qhov txawv tseem ceeb
Lub zog: GR 70 muaj zog dua (siab dua tensile / tawm los) dua GR 60, ua rau nws haum rau siab - kev siv siab xws li petrochemical hlab ntsha, whereas GR 60 yog rau nruab nrab - siv siab.
Ductility / Formability: GR 60 yog cov ductile ntau dua, ua kom yooj yim rau kev tsim thiab vuam, muaj txiaj ntsig zoo rau cov duab nyuaj hauv cov xwm txheej nruab nrab.
Chemical Composition: GR 70 feem ntau muaj cov pa roj carbon ntau dua me ntsis thiab manganese cov ntsiab lus, ua rau nws muaj zog dua.
Daim ntawv thov
ASTM A516 GR 70: Zoo rau:
Siab - cov hlab ntsha siab hauv cov roj, roj, thiab kev ua tshuaj lom neeg.
Boilers hauv kev tsim hluav taws xob xav tau lub zog muaj zog.
Cryogenic daim ntaub ntawv zoo li LNG cia tso tsheb hlau luam.
ASTM A516 GR 60 Cov ntsiab lus:
Nruab nrab - cov hlab ntsha siab uas tus nqi thiab kev tsim khoom yog qhov tseem ceeb.
Boilers thiab tanks xav tau siab ductility rau fabrication.
Tsawg- daim ntawv thov kub nrog qhov yuav tsum tau muaj zog tsawg dua.
Weldability
Ob qib yog tag nrho tua cov pa roj carbon steel nrog zoo weldability siv cov txheej txheem txheem (SMAW, GTAW, SAW). Txawm li cas los xij:
ASTM A516 GR 70: Cov ntsiab lus carbon ntau dua yuav tsum tau ua tib zoo vuam kom tsis txhob muaj teeb meem nyuaj, tab sis normalization txhim kho vuam zoo.
ASTM A516 GR 60: Cov ntsiab lus qis dua ua kom yooj yim vuam, txo qhov kev pheej hmoo ntawm kev tawg.
