### 1. Dab tsi yog gr 50 cov khoom?
"Gr 50" hais txog qib khoom nrog A ** Tsawg Nws tsis yog ua tiav cov ntaub ntawv tshwj xeeb ntawm nws tus kheej. Lo lus "Gr 50" feem ntau cuam tshuam nrog ob tus tseem ceeb ASTM qauv rau cov qauv hlau qauv:
* ** ASTM A992: ** Qhov no yog thawj tus qauv rau dav- flange cov qauv kev tsim qauv (zoo li} Beams) siv hauv kev tsim kho vaj. A992 GR 50 yog feem ntau cov qhab nia rau cov duab no.
* ** ASTM A572: ** Qhov no yog tus qauv rau high {{{{}}}}}} paab qauv hlau, daim hlau, thiab kab. A572 GR 50 yog qib ntau heev nyob rau hauv qhov kev qhia tshwj xeeb no.
Hauv cov ntsiab lus xaus, thaum ib tug neeg hais tias "gr 50 cov ntaub ntawv," lawv yuav luag tau xa mus rau ib qho kev tsim qauv sib sau los ntawm A992 lossis ASTM A572 uas muaj tsawg kawg nkaus zog ntawm 50 KSI.
### 2. Dab tsi yog gr8 khoom?
"Gr b8" yog hais txog qib tshwj xeeb ntawm cov hlau tshwj xeeb ** siv rau cov tshuab luam ntawv, raws li AQUM A193 tus qauv.
* ** AFFECT: ** ASTM A193 / A193m yog "Txheem Kev Ncaj Ncees rau Alloy- cov khoom siv kub thiab lwm yam kev siv siab."
* ** QIB COV KHOOM: ** Qib B8 yog ib qho ** Austenicial Stainless Hlau ** Tshaj rau Hom 304 stainless hlau.
* ** Ib qho xwm txheej: ** Nws yog feem ntau muab rau hauv ** chav 1 (anealed) ** muaj qhov muaj zoo corrosion tsis kam thiab kev sib cav. Lwm qhov xwm txheej B8 yog B8 kawm 2, uas yog lim - tawv} tawv rau lub zog siab dua.
* ** QIB SIV: ** Qeb B8 Bolts, studs, thiab muaj zog, xws li kev ua kom zoo, roj av ua kom zoo dua qub, thiab cov chaw muaj dej hiav txwv.
### 3. Dab tsi yog AQUM A572 GR 50 sib npaug?
ASTM A572 Qib 50 yog qhov siab- lub zog, qis} aleoL txheej txheem steel. Nws cov sib npaug hauv lwm cov qauv thoob ntiaj teb yog:
* ** European Txuj Ci (En): ** ** S355J2 ** (raws li EN 10025-2). Qhov "S355" txhais tau tias tsawg kawg yog cov txiaj ntsig lub zog ntawm 355 MPa, uas yog cov metric sib npaug ntawm 50 ksi.
* ** OROOSS Cov txheej txheem thoob ntiaj teb (ISO): ** ** ISO 630-2: E355 ** (E355DD1, E355DD2, thiab lwm yam.
* ** Tus qauv Japanese (JIS): ** ** SM490A, SM490B, lossis SM490C **. Tus "490" qhia txog qhov tsawg kawg tensile lub zog ntawm 490 MPa.
* ** Suav tus qauv (GB): ** ** Q345B lossis Q355B ** (tus qauv tshiab). Daim ntawv "Q355" qhia tau tias yog muaj lub zog los ntawm 355 MPa.
Nws yog ib qho tseem ceeb kom nco ntsoov tias thaum lub zog cov neeg kho tshuab (tawm lub zog) yog sib npaug, cov tshuaj lom neeg thiab cov cai tshwj xeeb yuav txawv. Ib txwm sab laj cov qauv tshwj xeeb rau cov ntawv tseem ceeb.
### 4. Dab tsi yog Attm A 53 GR B B B B BEN KHOOM?
ASTM A53 qib B yog tus qauv kev qhia tshwj xeeb rau ** cov yeeb nkab roj carbon steel **. Nws yog ib qho ntawm cov kav dej feem ntau siv rau cov phiaj ntawv dav dav dav.
* ** Hom: ** Nws tuaj yeem yog ** hom E ** (hluav taws xob tiv thaiv welded) lossis ** hom s ** (seamless). Hom F (Rauv Welded) tsis tshua muaj.
* ** QIB: ** Qib B muaj qhov ntau dua qhov tsawg kawg tensile muaj zog thiab tawm los piv rau qib A.
* ** Daim ntawv thov: ** Nws yog dav siv rau kev siv tshuab thiab kev siv siab, nrog rau kev xa pa cua, dej, chav dej, thiab roj. Nws tseem siv tau siv raws li cov yeeb nkab cov yeeb nkab, txawm hais tias Astm A500 tau haum rau lub hom phiaj ntawd. Nws tuaj yeem muab khoom liab qab (dub) lossis nrog cov txheej txheem galvanized rau kev tiv thaiv corrosion.
### 5. Dab tsi yog qhov sib txawv ntawm ASTM A500 GR thiab C?
ASTM A500 yog tus qauv kev qhia tshwj xeeb rau ** txias {1} Taug kev welded thiab seamless carbon hlau tubing ** hauv cov duab xws li puag ncig, square, thiab duab plaub. Thawj qhov sib txawv ntawm qib B thiab qib C yog lawv ob lub tshuab khoom siv dag zog **.
* ** Lub zog: ** ** Qib C muaj zog ntau dua cov kev yuav tsum muaj zog tsawg dua Qib B. **
* ** PAUB Lub zog: ** Rau plaub thiab xwmfing thiab square tub, qib b muaj min. Tawm los ntawm 50,000 psi (345 MPa), thaum qib C muaj min. Tawm los ntawm 55,000 psi (380 MPa) rau qhov ntau tshaj 10 nti thiab 60,000 psi (415 mpa) rau qhov ntau thiab tsawg.
* ** TENSILE lub zog: ** Qib B muaj min. Tensile lub zog ntawm 62,000 psi (427 MPA), thaum qib C muaj min. Tensile lub zog ntawm 70,000 psi (483 MPa) rau ntau tshaj 10 nti thiab 65,000 psi (448 mpa) rau qhov ntau thiab tsawg.
* ** Daim ntawv thov: ** Vim tias nws lub zog dua, qib C tso cai rau kev siv tshuab thinner, los txhawb nqa tib tshooj, muaj peev xwm ua rau cov khoom siv thiab cov khoom siv nyiaj. Qib B yog qhov ntau thiab General- lub hom phiaj qib, thaum qib C yog qhov muaj zog}} Qhov hnyav} qhov hnyav.
