1. Dab tsi yog thawj daim ntawv thov ntawm ASTM SA179 steel yeeb nkab?
ASTM SA179 yog ib qho kev qhia tshwj xeeb rau seamless txias -kos qis- carbon steel tubes feem ntau tsim rauKev siv hluav taws xob, condenser, thiab boiler siv. Nws yog dav siv nyob rau hauv fais fab nroj tsuag, petrochemical chaw, tub yees tshuab, thiab cov txheej txheem kev lag luam cov cuab yeej uas muaj peev xwm hloov cov cua sov thiab tsis kam mus rau nruab nrab siab / kub yuav tsum tau.
2. Cov khoom tseem ceeb ntawm ASTM SA179 steel yog dab tsi?
ASTM SA179 yog tsim los ntawm qis- cov pa roj carbon steel (feem ntau C Tsawg dua lossis sib npaug li 0.15%) nrog cov ductility zoo, weldability, thiab thermal conductivity. Cov khoom tseem ceeb muaj xws li:
Tensile zog: 330-480 MPa (48-70 ksi)
Yield zog: Ntau dua lossis sib npaug rau 205 MPa (30 ksi)
Elongation: Ntau dua lossis sib npaug li 30% (hauv 50 mm)
Brinell hardness: Tsawg dua los yog sib npaug rau 121 HBIt pom zoo formability thiab tuaj yeem txias - ua haujlwm lossis welded siv cov txheej txheem txheem.
3. Qhov luaj li cas ntawm ASTM SA179 npog?
ASTM SA179 qhia meej seamless txias -kho cov hlab nrog:
Sab nraud txoj kab uas hla (OD): 12.7 hli (0.5 nti) txog 152.4 hli (6 nti)
Phab ntsa thickness (WT): 0.89 hli (0.035 nti) rau 12.7 hli (0.5 nti)
Ntev: Feem ntau 3-12 meters (10-40 ko taw), nrog rau kev cai ntev muaj raws li qhov kev thov.
4. Qhov kub thiab txias npaum li cas yog ASTM SA179 haum rau?
ASTM SA179 ua haujlwm zoo hauv qhov kub thiab txias-29℃(-20℃F) rau 454℃(850℃F). Nws tuav cov txheej txheem kev ncaj ncees thiab kev hloov hluav taws xob ua haujlwm nyob rau hauv qhov ntau, ua rau nws zoo tagnrho rau qhov nruab nrab kub kub hloov hluav taws xob. Rau qhov kub siab dua (dhau 454 degree), cov hlau alloy hlau (xws li ASTM SA213) yog qhov nyiam.
5. ASTM SA179 txawv ntawm ASTM A179 li cas?
ASTM SA179 thiab ASTM A179 qhia cov kev cai zoo ib yam (cov ntaub ntawv muaj pes tsawg leeg, cov khoom siv kho tshuab, qhov ntev) tab sis txawvdaim ntawv thov Scope thiab ntawv pov thawj:
ASTM SA179: "S" txhais tau tias nws tau pom zoo rauboiler thiab siab nkoj kev pab(ua raws li ASME Boiler & Pressure Vessel Code, Tshooj II, Ntu A).
ASTM A179: General-lub hom phiaj qis- cov pa roj carbon steel raj rau kev siv tsis yog- kev siv siab (xws li, cov qauv siv tshuab, qis- cov kav dej siab).
