ASTM A252 specification yog dab tsi?
ASTM A252 yogstandard specification rau welded thiab seamless steel yeeb nkab pawg. Nws npog lub nominal phab ntsa tuab ntawm lub tog raj kheej zoo steel yeeb nkab, cov yeeb nkab tsis suav nrog. Cov kav dej puag ncig no yog siv rau lub hom phiaj piling, ua si ua lub luag haujlwm tas li ntawm kev thauj khoom nqa thiab nqa lub siab.
lsaw steel yeeb nkab yog dab tsi?
LSAW yog lub npe luv rauLongitudinal Submerged Arc Vuam. LSAW yeeb nkab txheej txheem pib nrog lub phaj uas yog tsim rau hauv cov yeeb nkab los ntawm kev koom nrog txhua sab ntawm lub phaj / strip longitudinally raws li qhov xav tau txoj kab uas hla, ces welded nrog muab tub lim hlau.
A252 GR1 GR2 yeeb nkab pawg Specification
| Txuj | ASTM A252, ASTM A252 |
| Qib Steel | Gr.1 |
| Gr.2 | |
| Gr.3 | |
| Diamensions | 6" – 56" |
| O.D | 168.3mm - 1422mm |
| DN | DN150 - DN1400 |
| Phab ntsa Thickness | 0.134"- 1" |
| 3.40mm-25.4 hli | |
| Cov yeeb nkab ntev | R1 (4.88m – 7.62m) |
| R2(7.62m – 10.67m) | |
| Mus txog Thov | |
| Cov yeeb nkab kawg | Plain, Bevelled |
| Txheej txheem | Qhib -hearth, Basic-oxygen, lossis Electric- cub |
| Kev tsim khoom | SMLS, ERW, Flash welded, los yog Fusion welded txheej txheem |
| Tiv thaiv corrosion | Lacquer, Varnish, Oiling, Galvanizing |
| FBE, 2LPP, 3LPP, 2LPE, 3LPE |
Tshuaj muaj pes tsawg leeg ntawm ASTM A252 Steel Piling Pipe
| 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, 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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Tensile Requirements ntawm ASTM A252 Qib
| 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: | |||
Qhov txawv ntawm API 5L thiab ASTM A252 yog dab tsi?
| Parameter | ASTM A106 (Seamless Carbon Pipe rau High -Temp Service) | ASTM A252 (welded steel yeeb nkab) |
|---|---|---|
| Txuj | ASTM A106 / A106M-19a Cov Lus Qhia | ASTM A252 / A252M-22 |
| Kev tsim khoom | Kub-rolled/Cold- kos seamless yeeb nkab (tsis muaj qhov tsis xws luag) | Longitudinal (EFW) / Kauv (SAW) vuam (yuav tsum tau kuaj xyuas UT) |
| Qib System | A (Low-C), B (Standard), C (High-Strength) | GR1 (Lub teeb-Load), GR2 (Medium-Load), GR3 (Havy-Load) |
| Yield zog | Qib A: Ntau dua lossis sib npaug ntawm 205 MPa Qib B: Ntau dua lossis sib npaug li 240 MPa Qib C: Ntau dua lossis sib npaug ntawm 275 MPa |
GR1: Ntau dua lossis sib npaug rau 207 MPa GR2: Ntau dua lossis sib npaug rau 241 MPa GR3: Ntau dua lossis sib npaug rau 345 MPa |
| Qhov kub thiab txias | -29℃rau 650 degree ✅ Superior creep resistance |
-45℃rau 100 degree ✅ GR3 mandates -45℃Charpy xeem |
| Cov ntawv thov tseem ceeb | Pressure Piping Systems: • Boiler/heat exchanger tubes • Refinery process pipes (replaces Q235B >400 degree) |
Cov qauv tsim: • GR3 + Q235B connectors( hla- hiav txwv choj pawg) • GR 2choj piers (tus nqi-zoo) • GR 1ib ntus shoring |
| Impact Toughness | Qib B/C: Charpy V-notch ntawm -29 degree | GR3: Charpy V-notch ntawm -45 degree( nruj dua Q235B's 20 degree) |
| Corrosion Control | Anti -oxidation: • Rwb thaiv tsev + hauv ob sab phlu |
Kev tiv thaiv av / dej hiav txwv: • Epoxy txheej + cathodic tiv thaiv |
| Synergy nrog Q235B | ❌ Tsis muaj kev sib koom ua ke ncaj qha | ✅ Core Synergy GR3 lub ntsiab pawg + Q235B connector nplhaib (kev ntxhov siab hloov kho kom zoo) |
| Tus nqi siv | Qib B:$1,200/ton(40% > Q235B) | ua GR3:$900/ton(30% |
| Txwv tsis pub siv | ❌ Pile foundations (tus nqi- txwv tsis pub) | ❌ Siab piping (ASME B31.1 txwv) |
ASTM A252 GR1 thiab GR2 welded kav feem ntau yog siv rau hauv cov hauv qab no:
Kev tsim kho Foundation Engineering
GR 1: Cov pob zeb hauv av ntiav rau cov qauv me me (cov av nplaum tawv tawv, cov kabmob muaj peev xwm tsawg dua lossis sib npaug li 120 kN / m²)
GR 2: Kev sib txhuam pawg rau siab- cov tsev nce siab (cov av xuab zeb, xav tau Q235B txuas)
Tsheb thauj mus los Infrastructure
GR 2: Txoj kev loj choj piers / abutments (nruab nrab corrosion ib puag ncig, txuam ASTM A252 Chav Kawm 2 tiv thaiv corrosion)
Cov Khoom Siv Muaj
GR 2: Cov yeeb nkab khib txhawb nqa hauv cov nroj tsuag petrochemical (cov av nruab nrab, 20% tus nqi qis dua GR3)
Kev kuaj thiab tshuaj xyuas
Peb lub Hoobkas
