ASTM A672 CC70 CS EFW Pipes piav qhia
Nyob rau hauv ASTM A672 C70 welded yeeb nkab, "C70" qhia qhov tsawg kawg nkaus yield zog ntawm 70 ksi (kwv yees li 483 MPa). Cov yeeb nkab steel no muaj cov khoom siv zoo heev thiab siab - qhov kub thiab txias, ua tau raws li cov kev cai nruj ntawm siab - cov kav dej siab. Raws li ASTM A672 tus qauv, cov yeeb nkab steel hom no yuav tsum tau tsim los ntawm kev siv hluav taws xob vuam, thiab cov vuam vuam yuav tsum tsis muaj{10}} kuaj kev puas tsuaj (xws li ultrasonic lossis radiographic kuaj) kom ntseeg tau tias lawv muaj kev ncaj ncees. Tsis tas li ntawd, cov tshuaj muaj pes tsawg leeg ntawm cov yeeb nkab steel yuav tsum tau tswj nruj me ntsis, nrog cov ntsiab lus carbon feem ntau tsis tshaj 0.25%, thiab muaj cov manganese, silicon, thiab lwm yam khoom tsim nyog los txhim kho lub zog thiab tawv.
Carbon Steel ASTM A672 gr c70 tshuaj muaj pes tsawg leeg
| A672 qib | Tshuaj muaj pes tsawg leeg | |||||
| C | Si | Mn | P | S | Ti | |
| CC70/C70 | 0.27 | 0.13 ~0.45 |
0.79 ~1.30 |
0.035 | 0.035 | - |
Tsawg CS ASTM A672 gr c70 Pipes Mechanical Properties Chart
| A672 qib | Yield zog (N / mm2) | Tensile Properties (N/mm2) | Elongation (%) | Vuam taw tes tensile zog (N / mm2) |
|---|---|---|---|---|
| CC70/C70 | 260 | 485~620 | 21 | 485~620 |
Kev tsim cov ASTM A672 CC70 welded yeeb nkab feem ntau suav nrog cov kauj ruam tseem ceeb hauv qab no:
1. Kev npaj daim ntawv: Cov pa roj carbon manganese steel phaj raws li tus qauv yuav tsum tau xaiv thiab ua ntej- kho (leveling, ntug trimming, thiab lwm yam) ua ntej nkag mus rau hauv txoj kev tsim.
2. Kev sib sau thiab Vuam: Cov hlau daim hlau yog khoov rau hauv cov duab tubular siv JCOE lossis UOE cov txheej txheem, ua raws li kev sib txuas ncaj nraim siv siab - zaus vuam (HFW) lossis submerged arc vuam (SAW). Kev tswj xyuas nruj ntawm cov khoom siv hluav taws xob yuav tsum tau ua thaum vuam kom tsis txhob muaj cov nplej coarsening hauv thaj tsam weld.
3. Kev kho cua sov: Tom qab-weld normalizing kev kho yog tsim nyog los tshem tawm cov residual vuam kev nyuaj siab, homogenize lub microstructure, thiab xyuas kom meej tias txhua yam khoom raws li cov qauv.
4. Kev Tshawb Fawb thiab Kev Txais: Cov khoom tiav tau txais kev sim hydrostatic, tsis yog - kuaj kev puas tsuaj, thiab kev soj ntsuam qhov ntev. Lawv tsuas yog tso tawm tom qab ntsib ASTM A672 thiab cov neeg siv khoom kev pom zoo.
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