1. Cov kev xeem twg yog qhov yuav tsum tau ua rau ASTM SA179?
Kev xeem yuav tsum tau ua rau ASTM SA179 suav nrog:
Tshuaj ntsuam xyuas muaj pes tsawg leeg: Txheeb xyuas cov pa roj carbon, manganese, phosphorus, sulfur, thiab silicon cov ntsiab lus.
Tensile xeem: Ntsuas lub zog tensile, yield zog, thiab elongation.
Kev kuaj Hardness: Xyuas kom hardness tsis tshaj 121 HB.
Tsis yog -kev kuaj kev puas tsuaj (NDT): Kev ntsuas hydrostatic (tsawg kawg 5 MPa rau 5 vib nas this) los xyuas cov dej xau; Kev kuaj ultrasonic yog xaiv tau tab sis feem ntau rau cov ntawv thov tseem ceeb.
2. ASTM SA179 puas tuaj yeem welded?
Yog lawm, ASTM SA179 yog cov weldable heev siv cov txheej txheem fusion vuam xws li GTAW (TIG), GMAW (MIG), SMAW (stick), thiab SAW (submerged arc vuam). Preheating feem ntau tsis tas yuav tsum tau rau phab ntsa thickness tsawg dua los yog sib npaug li 12.7 hli, tab sis tom qab-weld kho cua sov (PWHT) tej zaum yuav xav tau rau tuab- cov phab ntsa phab ntsa lossis cov chaw ua haujlwm hnyav los txo cov kev ntxhov siab seem.
3. Dab tsi nto tiav rau ASTM SA179?
ASTM SA179 raj feem ntau yog muab nrog ob qhov chaw tiav:
Bright annealed: Smooth, huv si saum npoo (Ra tsawg dua lossis sib npaug ntawm 0.8 μm) ua tiav los ntawm kev tswj cov annealing hauv qhov chaw tiv thaiv; zoo tagnrho rau tshav kub exchangers kom txo fouling.
Dub oxide: Tsaus, nyias oxide txheej tsim thaum kub dov; haum rau tsis yog{0}} daim ntawv thov tseem ceeb lossis qhov chaw pleev xim / txheej yuav raug siv.
4. Dab tsi yog hom kev ua tsis tiav ntawm ASTM SA179 thiab yuav tiv thaiv lawv li cas?
Hom kev ua tsis tau zoo xws li:
Corrosion: tshwm sim hauv kev tawm tsam hnyav (piv txwv li, kua qaub / cov kua hauv paus). Kev Tiv Thaiv: Siv cov tshuaj tiv thaiv corrosion-cov tshuaj tiv thaiv (piv txwv li, galvanizing, epoxy) lossis xaiv cov khoom siv hlau rau qhov chaw hnyav.
Nplej tawg: Ua los ntawm cyclic siab / kub loads. Kev Tiv Thaiv: Ua kom muaj kev txhawb nqa lub raj zoo, zam kev khoov ntau dhau, thiab ua cov tshuaj xyuas NDT tsis tu ncua.
Kev yaig: Vim muaj cov kua dej ntau tshaj -. Kev Tiv Thaiv: Txhim kho cov nqi ntws los yog teeb tsa cov ntaub thaiv kev yaig.
5. Puas yog ASTM SA179 siv tau nrog cov dej haus?
ASTM SA179 yogtsis pom zoo rau cov dej hausncaj qha. Thaum nws qis - carbon hlau muaj pes tsawg leeg tsis yog - tshuaj lom, nws yog qhov ua rau xeb thiab xeb hauv dej, uas tuaj yeem ua paug rau cov dej haus thiab txo cov kev pab cuam lub neej. Rau kev siv dej haus, siv cov raj tsis muaj steel hlau (xws li ASTM A269) lossis carbon steel tubes nrog potable- qib txheej (xws li, cement mortar hauv ob sab phlu).
