ASTM A252, ASTM A252yog tus qauv specification rau seamless thiab welded steel kav siv los ua steel yeeb nkab pawg. Qib 2 yog qib nruab nrab ntawm ASTM A252, nrog lub zog tensile ntawm 415 MPa (60,000 psi) thiab lub zog tawm ntawm 240 MPa (35,000 psi).
Nws yog haum rau nruab nrab -load kev tsim kho tej yam kev mob, feem ntau siv nyob rau hauv lub lighter load qauv thiab cov av zoo, xws li:
Cov tsev me
Cov qauv ib ntus
Landscaping tej yaam num
Cov txheej txheem tsim khoom
ASTM A252 Qib 2 cov yeeb nkab tuaj yeem tsim tau siv cov hauv qab no:
Seamless (SMLS)
Ua los ntawm kub dov los yog txias daim duab los ntawm ib tug billet tsis welded seams.
Hluav taws xob Resistance Welded (ERW)
Ntug ntawm cov hlau phaj yog rhuab los ntawm resistive siab - zaus tam sim no thiab welded nyob rau hauv mechanical siab.
Flash Welded
Ntug yog rhuab mus rau lub xeev molten thiab nias ua ke sai sai.
Fusion Welded
Ntug yog rhuab mus rau lub xeev molten thiab welded. Xws li cov txheej txheem EFW, LSAW, thiab SSAW.
Seam Orientation:
Welded yeeb nkab yuav muaj longitudinal, helical - taub qab, los yog helical - lap seams.
Cov khoom tsim tau zoo welded seams tsis cuam tshuam rau kev ua haujlwm zoo.
Tshuaj muaj pes tsawg leeg
Phosphorus (P): Tsawg dua lossis sib npaug rau 0.050%
Daim ntawv tshaj tawm tshuaj ntsuam xyuas tshuaj yuav tsum muab rau txhua qhov ntau, txawm tias tsis tau thov tshwj xeeb hauv kev txiav txim.
Mechanical Properties
ASTM A252 Qib 2 yuav tsum tau kuaj tensile raws li thawj qhov kev ntsuas tshuab. Lwm yam kev ntsuam xyuas xws li flattening lossis khoov tsis tas yuav tsum tau ua raws li tus qauv.
Qib 2 Mechanical Summary
| Khoom | Yam tsawg kawg nkaus |
|---|---|
| Tensile zog | 60,000 psi (415 MPa) |
| Yield zog | 35,000 psi (240 MPa) |
| Elongation (8 hauv / 203.2mm) | 14% |
| Elongation (2 hauv / 50.8mm) | 20% |
Nominal Phab Ntsa Thickness Kho:
Rau cov thicknesses qis dua 5/16 hauv (7.9 hli), txiav tawm ntawm qhov yooj yim 2 hauv elongation ib 1/32 hauv (0.8 hli) txo:
Kev txiav tawm rau Qib 2: 1.25% rau 0.8 hli txo
Tsawg kawg Elongation los ntawm Phab Ntsa Thickness
| Nominal Phab Ntsa Thickness | mm | Elongation hauv 2 hauv, min% |
|---|---|---|
| 5/16 (0.312) | 7.9 | 25.00 |
| 9/32 (0.281) | 7.1 | 23.75 |
| 1/4 (0.250) | 6.4 | 22.50 |
| 7/32 (0.219) | 5.6 | 21.25 |
| 3/16 (0.188) | 4.8 | 20.00 |
| 11/64 (0.172) | 4.4 | 19.50 |
| 5/32 (0.156) | 4.0 | 18.75 |
| 9/64 (0.141) | 3.6 | 18.25 |
| 1/8 (0.125) | 3.2 | 17.50 |
| 7/64 (0.109) | 2.8 | 16.75 |
Daim ntawv qhia Interpolation:
Rau nruab nrab thickness:
E=1.56t+12.50E = 1.56t + 12.50E=1.56t+12.50
Qhov twg:
E=Elongation hauv 2 hauv (50.8 mm) %
t=Nominal phab ntsa thickness in inches (mm)
Daim ntawv pov thawj
Cov chaw tsim khoom yuav tsum muab Daim Ntawv Pov Thawj Ua Raws Cai hais tias tag nrho cov yeeb nkab steel:
Tau tsim, kuaj, thiab tshuaj xyuas raws li ASTM A252
Ua tau raws li cov kev xav tau ntxiv uas tau teev tseg hauv qhov kev txiav txim
