Dab tsi yog astm a252 khoom
A252 feem ntau yog hais txog tus qauv ASTM A252, uas yog tus qauv rau cov kav hlau siv rau pawg thiab cov kav dej. Cov khoom siv feem ntau yog carbon hlau lossis hlau tsis tshua muaj hlau, nyob ntawm qib (xws li GR.1, GR.2, GR.3).
Astm a252 khoom specifications
| Txuj | ASTM A252, ASTM A252 |
| Qib Steel | Qib 1 |
| Qib 2 | |
| Qib 3 | |
| Diamensions | 6" – 56" |
| 168.3mm - 1422mm | |
| DN150-DN1400 | |
| Thickness | 0.134"- 1" |
| 3.40mm-25.4 hli | |
| Unit Length | R1 (4.88m – 7.62m) |
| R2(7.62m – 10.67m) | |
| Uniform Length | |
| Cov yeeb nkab kawg | Plain, Bevelled |
astm a252 tshuaj muaj pes tsawg leeg
| Kev xav tau tshuaj | |||||
|---|---|---|---|---|---|
| Lub ntsiab | Kev sib xyaw,% | ||||
| Qib B thiab D | Qib C | ||||
| Kev Ntsuas Kub | Kev tshuaj xyuas khoom | Kev Ntsuas Kub | Kev tshuaj xyuas khoom | ||
| Cov pa roj carbon, maxA | 0.26 | 0.30 | 0.23 | 0.27 | |
| Manganese, maxA | 1.35 | 1.40 | 1.35 | 1.40 | |
| Phosphorus, max | 0.035 | 0.045 | 0.035 | 0.045 | |
| Sulfur, max | 0.035 | 0.045 | 0.035 | 0.045 | |
| tooj, minB | 0.20 | 0.18 | 0.20 | 0.18 | |
| A Rau txhua qhov txo qis ntawm 0.01 feem pua ntawm cov ntsiab lus hauv qab qhov siab tshaj plaws rau cov pa roj carbon monoxide, qhov nce ntawm 0.06 feem pua saum toj no qhov siab tshaj plaws rau manganese tau tso cai, mus txog qhov siab tshaj plaws ntawm 1.50% los ntawm kev ntsuas kub thiab 1.60% los ntawm kev tshuaj xyuas cov khoom. B Yog tias tooj liab- muaj cov hlau tau teev nyob rau hauv daim ntawv xaj yuav khoom. |
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Astm a252 mechanical zog pdf
| Tensile Requirements | |||
|---|---|---|---|
| Mechanical Properties | Qib 1 | Qib 2 | Qib 3 |
| Tensile zog, min, psi [MPa] | 50 000 [345] | 60 000 [415] | 66 000 [455] |
| Tawm taw tes lossis tawm lub zog, min, psi [MPa] | 30 000 [205] | 35 000 [240] | 45 000 [310] |
| Basic yam tsawg kawg nkaus elongation rau nominal phab ntsa thicknesses 5⁄16 nyob rau hauv. [7.9 mm] los yog ntau tshaj: | – | – | – |
| Elongation hauv 8 nti [203.2 mm], min, % | 18 | 14 | – |
| Elongation hauv 2 nti [50.8 mm], min, % | 30 | 25 | 20 |
| Rau nominal phab ntsa thicknesses tsawg dua 5⁄16 nyob rau hauv. [7.9 mm], txiav tawm los ntawm qhov yooj yim yam tsawg kawg nkaus elongation nyob rau hauv 2 in. [50.8 mm] rau txhua 1⁄32 – nyob rau hauv. [0.8 mm] txo nyob rau hauv nominal phab ntsa thickness qis dua 5⁄16 hauv. | 1.50A | 1.25A | 1.0A |
| A Table 2 muab cov txiaj ntsig yam tsawg kawg nkaus suav nrog: | |||
astm a252 vs a53 ua
| Parameter | ASTM A252 (Piling yeeb nkab) | ASTM A53 (Fluid Pipe) |
|---|---|---|
| Kev siv thawj zaug | Foundation pawg / tuav cov qauv | Kev xa tawm dej (dej / roj / roj) |
| Lub zog tseem ceeb | Khoov tsis kam (Gr.3 tawm los Ntau dua lossis sib npaug rau 241 MPa) | Sab hauv siab tsis kam (Gr.B tawm los Ntau dua lossis sib npaug rau 240 MPa) |
| Kev xav tau tseem ceeb | Kev Ncaj Ncees Tsawg dua lossis sib npaug li 0.25% ntawm qhov ntev | 100% hydrostatic xeem dhau |
| Weld Hom | Kauv/seam weld (load-bearing) | Seamless / hluav taws xob kuj weld (sealed) |
| Kev tsis lees paub | Tsis lees paub yog lub cev khoov | Tsis lees paub rau pinhole leaks |
ASTM A252 Piling Pipes Hoobkas
