ASTM A252 Qib 3 Pipes yog dab tsi
A252 GR3 steel yeeb nkab ua raws qib 3 (GR3) ntawm American ASTM A252 tus qauv. Nws yog tsim los rau siab -load pawg hauv paus thiab feem ntau yog ua los ntawm cov yeeb nkab steel (ncaj seam weld / kauv weld). Seamless thev naus laus zis tsis tshua muaj (cov yeeb nkab seamless tsis yog qhov tseem ceeb hauv cov qauv thiab yuav tsum tau kho tshwj xeeb). Nws yog siv rau cov qauv kev txhawb nqa sib sib zog nqus uas hnyav hnyav (xws li super siab-cov tsev nce siab, hla- hiav txwv txuas hniav, thiab lwm yam).
ASTM A252 Qib 3 Pipes Specification
| Khoom npe | ASTM A252 Piping Yeeb |
| Phab ntsa Thickness | SCH 20, SCH30, SCH40, Standard (STD), Extra Heavy (XH), 80, 100, 120, 140, 160, XXH |
| Phab ntsa Thickness kam rau ua | ± 12.5% ntawm phab ntsa tuab ntawm A252 |
| Steel Piles Length | SRL, DRL los yog raws li qhov xav tau ntev |
| Qib 3 Piling Piping Ncaj | 0,20% ntawm tag nrho qhov ntev thiab 3 hli dhau 1 m ntev |
| Pipe Standard | ASTM A252, ASTM A252 |
| Steel Piles Qib | Qib 1, Qib 2, Qib 3 lossis lwm qib sib npaug steel |
| Piping Pipe Test | UT test, Tensile test, Yield test, Flatten test lossis lwm yam kev xeem uas xav tau |
| Yeeb Nkab Txheej | Kev pleev xim dub, xim kua roj vanish, roj pleev xim, liab qab lossis lwm yam txheej yuav tsum tau ua |
| Steel Piles Pob | Cov kaus mom yas ntawm ob qhov kawg, Steel pob, lossis acc. rau cov neeg siv khoom thov |
| Steel Piles Capacity | 10000 metric tons ib hlis |
| A252 Piling Piping Lub Sijhawm Xa Khoom | 30 hnub tiv thaiv kev tso nyiaj lossis LC thaum pom |
A252 GR3 VS A252 GR2
| Kev ua haujlwm qeb | GR3 yuav tsum tau | Qhov zoo tshaj GR2 |
|---|---|---|
| Mechanical Properties | ||
| - Yield zog | Ntau dua lossis sib npaug rau 310 MPa (45 ksi) | 28% siab dua GR2 (Ntau dua lossis sib npaug rau 242 MPa) |
| - Lub zog tensile | 455-565 MPa (66-82 ksi) | ~ 10% nce nyob rau hauv siab txwv |
| - Elongation | Ntau dua lossis sib npaug li 23% | Superior toughness |
| Tshuaj muaj pes tsawg leeg | ||
| - Cov pa roj carbon (C) | Tsawg dua lossis sib npaug li 0.22% | Tsawg carbon cov ntsiab lus, txhim kho weldability |
| - Phosphorus (P) | Tsawg dua lossis sib npaug li 0.025% | Kev tswj hwm nruj ntawm cov khoom tsis zoo |
| - Sulfur (S) | Tsawg dua lossis sib npaug li 0.035% | Txo kub -shortness txaus ntshai |
Cov ntsiab lus ntawm cov ntawv thov tseem ceeb rau A252 GR3 steel yeeb nkab:
I. Deep foundations for super high-rise buildings: Used in projects such as the Shanghai Tower (82m pile depth) and the Shenzhen Ping An Finance Center. Its high yield strength (≥310MPa) effectively resists deep soil lateral pressure and uneven settlement. Low sulfur and phosphorus content (P≤0.025%, S≤0.035%) reduces the risk of welding cracks, making it suitable for concrete composite pile foundations with loads >15,000 KN.
II. Hla- hiav txwv choj thiab qhov av engineering: Cov piv txwv muaj xws li cov koog pov txwv hauv paus ntawm Hong Kong-Zhuhai-Makao Choj thiab lub qhov dej immersed txhawb nqa ntawm Shenzhen-Zhongshan Choj:
In highly corrosive seawater environments (Cl⁻>20,000mg / L), lub neej tsim 50 xyoo yog ua tiav los ntawm 3PE txheej + kev txi anodes.
High elongation (Ntau dua los yog sib npaug li 23%) yoog rau yoj cuam tshuam thiab geological shear kev nyuaj siab, tsis txhob nkig tawg.
III. Cov ntsiab lus txhawb nqa tseem ceeb rau Cov Hluav Taws Xob Hluav Taws Xob
Offshore Cua Turbine Jacket Foundations (piv txwv li, Rudong Project, Jiangsu): Thick-walled GR3 kav (phab ntsa thickness Ntau dua los yog sib npaug li 50mm) tiv thaiv alternating dej hiav txwv cua thiab yoj loads; Matched cathodic tiv thaiv los tiv thaiv ntsev tsuag corrosion.
LNG Cia Tank Foundations (piv txwv li, Tianjin Nangang Project):
Tsawg phosphorus thiab sulfur cov ntsiab lus tiv thaiv brittle tsis ua hauj lwm ntawm -162 degree.
IV. Heavy Port Machinery Foundations
Txhawb cov xwm txheej xws li Qingdao Chaw nres nkoj automated davhlau ya nyob twg:
Providing container crane track beams with 455–565MPa tensile strength, capable of withstanding >5,000kN dynamic cuam tshuam loads; Mooring piers ntiav 3PE txheej (2.8mm) + saib xyuas anodes los tiv thaiv nkoj cuam tshuam thiab dej hiav txwv yaig.
V. Kev Sib Tw Tshwj Xeeb Geological
Siab - thaj chaw av qeeg hnyav (xws li Tokyo Bay Tunnel): Siv qhov elongation tus nqi ntau dua lossis sib npaug li 23% los nqus av qeeg zog;
Deep soft soil zones (e.g., Singapore reclamation projects): Relying on high yield strength to achieve vertical stability of piles >60m tob.
