Vim li cas thiaj xaiv SA302 Gr B?

SA 302 Gr Bhais txogibASME (American Society of Mechanical Engineers) tus qauv rau manganese -molybdenum alloy steel daim hlau siv hauv boilers thiab siab hlab ntsha, muab cov khoom tshwj xeeb thiab cov khoom siv kho tshuab, feem ntau muab cov khoom siv rau kev siv vuam, nrog rau cov kev xav tau rau lub zog tensile (550-690 MPa) thiab lub zog tawm los (min 345 MPa).

Cov txheej txheem tseem ceeb & Cov yam ntxwv

1. Cov khoom siv

Cov khoom siv hauv kev tsom xam yog manganese-molybdenum (Mn-Mo) alloy steel, tshwj xeeb yog tsim los ua cov hlau tua tag nrho. Kev tua tag nrho yog ua tiav los ntawm kev ntxiv cov deoxidizers xws li txhuas lossis silicon thaum smelting, uas tshem tawm cov porosity sab hauv, cov khoom siv roj, thiab tshuaj cais tawm. Qhov kev kho no ua kom muaj cov qauv microstructure thiab muaj pes tsawg leeg, ua kom cov hlau muaj kev ncaj ncees, ductility, thiab weldability -tag nrho cov cim qhia kev ua haujlwm tseem ceeb rau cov ntawv thov uas muaj kev kub siab thiab kub, xws li cov hlab ntsha siab, boilers, thiab cov khoom siv petrochemical.

2. Cov txheej txheem tsim khoom

Cov txheej txheem tsim khoom tseem ceeb yog kub dov, txheej txheem uas ua kom sov lub steel billet mus rau qhov kub siab (feem ntau siab dua 1000 degree) ua ntej dov rau hauv daim hlau lossis ntawv. Kub dov refines lub grain qauv, lov ua coarse precipitates, thiab imparts cov khoom uas xav tau (xws li, lub zog thiab toughness) rau cov khoom. Rau cov xwm txheej uas xav tau kev ua tau zoo dua, tswj kev dov thiab txias (TMCP) feem ntau ua ke. Cov txheej txheem qib siab no tau tswj xyuas qhov kub thiab txias, txo qhov sib piv, thiab tom qab- dov txias npaum li cas los ua kom zoo dua cov hlau lub microstructure, ua kom muaj zog dua thiab tawv yam tsis muaj kev cia siab rau kev kho cua sov ntau dhau.

3. Kev kho cua sov yuav tsum tau ua

Kev kho cua sov specifications txawv raws li cov thickness ntawm steel phaj. Cov phaj nyias nyias (qis dua 40mm / ≈1.5 ntiv tes) feem ntau yog muab rau hauv raws li -rolled mob, raws li lawv cov seem nyias tso cai rau cov cua txias thiab zoo ib yam. Hauv qhov sib piv, cov phaj siab tshaj 40mm hauv thickness yog feem ntau normalized-rhuab mus rau qhov kub siab tshaj qhov tseem ceeb, tuav rau lub sijhawm tshwj xeeb, thiab tom qab ntawd cua-txias- kom tshem tawm cov kev ntxhov siab sab hauv thiab xyuas kom meej cov khoom sib xws thoob plaws tag nrho tus ntoo khaub lig- ntu. Tsis tas li ntawd, quenching/tempering los yog post{11}}weld heat treatment (PWHT) tuaj yeem kho raws li kev txiav txim kom ntxiv dag zog, txo cov kev ntxhov siab los ntawm vuam, thiab txhim kho kev qaug zog rau qhov chaw ua haujlwm hnyav.

4. Kev Ntsuas Zoo & Kev Pabcuam Ntxiv

Cov txheej txheem kuaj nruj nruj yog siv los lav cov khoom zoo. Kev kuaj ultrasonic (UT) yog siv los kuaj xyuas qhov tsis xws luag sab hauv (piv txwv li, tawg, suav nrog) uas pom tsis pom ntawm qhov muag liab qab; Charpy V-Kev ntsuas qhov cuam tshuam tsis zoo ntsuas qhov hnyav, tshwj xeeb tshaj yog nyob rau qhov kub thiab txias, txhawm rau tiv thaiv cov pob txha tawg hauv qab cua sov. Kev ntsuam xyuas Hydrogen Induced Cracking (HIC) kuj tau ua los xyuas cov hlau tsis kam tiv thaiv hydrogen- cuam tshuam txog kev puas tsuaj hauv ib puag ncig corrosive. Txhawm rau ua kom tau raws li qhov kawg- cov neeg siv xav tau, cov kev pabcuam ntxiv tau muab dav dav, suav nrog kev txiav txiav (rau qhov ntau thiab tsawg), corrosion-tiv taus painting (ntev- lub sijhawm cia thiab siv), tua blasting (kom tshem tawm cov oxides thiab impurities), thiab simulated PWHT (kom paub tseeb tias kev ua tau zoo tom qab vuam).

Carbon sib npaug: Ceq=【C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15】%

Cov ntawv thov tseem ceeb:

Cov nkoj siab:Reactors, separators, spherical tanks, cia cov hlab ntsha.

Boilers:Muaj boilers, chav nruas, liquefied petroleum gas (LPG) fwj.

Thaum tshav kub kub Exchangers:Cheebtsam rau thermal hloov.

Petrochemical Kev Lag Luam:Roj thiab roj cia, cov khoom siv ua haujlwm.

Fais fab nroj tsuag:Siab - cov kav dej siab, lub tshuab hluav taws xob siab lub plhaub, thiab lwm yam tseem ceeb.

Shipbuilding:Nws tuaj yeem siv rau hauv xeb- tiv thaiv hull tsim, tshwj xeeb tshaj yog nrog ntxiv corrosion kuj.

Hu rau tam sim no

Tag nrho cov specification thiab cov ntsiab lus muaj nyob rau ntawm kev thov. Cov ntaub ntawv saum toj no yog muab rau kev taw qhia nkaus xwb. Rau kev tsim tshwj xeeb thov hu rau peb cov neeg ua haujlwm muag khoom.

Dab tsi yog qhov kub siab tshaj plaws SA-302 Qib B tuaj yeem tiv taus?

SA-302 Qib B feem ntau yog siv ntawm qhov kub txog li ntawm 650℃F (345 degree). Ntawm cov kub no, nws khaws lub zog txaus thiab nkag siab tsis kam. Tshaj li qhov no, nws cov khoom siv kho tshuab tuaj yeem degrade, yog li nws tsis pom zoo rau kev pabcuam kub siab dua tshwj tsis yog raug ntsuas tshwj xeeb.

Puas yog SA-302 Qib B weldable?

Yog lawm, SA-302 Qib B feem ntau suav tias yog weldable siv cov txheej txheem vuam xws li SMAW, GMAW, thiab SAW. Kev tswj kom zoo preheating thiab interpass kub tswj yog tsim nyog los tiv thaiv cracking, tshwj xeeb tshaj yog nyob rau hauv thicker seem. Kev kho cua sov tom qab vuam kuj tseem tuaj yeem siv los txhim kho toughness thiab txo cov kev ntxhov siab seem.

Dab tsi yog cov kev siv ntawm SA-302 Qib B?

SA-302 Qib B yog dav siv nyob rau hauv cov hlab ntsha siab, boilers, thiab cia tso tsheb hlau luam uas ua hauj lwm nyob rau hauv nruab nrab mus rau high kub. Nws tseem pom muaj nyob rau hauv cov khoom siv hluav taws xob, cov khoom siv boiler, thiab cov kav dej. Nws ua ke ntawm lub zog, toughness, thiab weldability ua rau nws haum rau ntau yam kev lag luam, nrog rau kev tsim hluav taws xob thiab kev ua lag luam petrochemical.

SA-302 Qib B txawv li cas ntawm SA-302 Qib A?

SA-302 Qib B muaj cov ntsiab lus ntawm manganese thiab molybdenum ntau dua li qib A, ua rau muaj zog ntau dua thiab txhim kho kev ua haujlwm kub. Qib B yog qhov zoo dua rau kev thov cov hlab ntsha uas xav tau ntau dua qhov xav tau kev ntxhov siab ntau dua lossis kub ua haujlwm. Qib A yog qhov yooj yim dua thiab siv rau hauv cov mob hnyav dua.

Dab tsi thickness ntau yog SA-302 Qib B muaj nyob rau hauv?

SA-302 Qib B yog tsim nyob rau hauv ntau thicknesses, feem ntau ntawm 1/2 nti mus rau ob peb nti. Cov phaj tuab yuav xav tau kev kho cua sov tshwj xeeb kom ntseeg tau tias cov khoom sib xws los ntawm ntu. Qhov muaj nyob rau hauv ntau lub thicknesses tso cai rau nws siv nyob rau hauv ntau lub siab lub nkoj tsim.

Cov qauv twg tswj hwm SA-302 Qib B?

SA-302 Qib B tau teev tseg hauv ASME Tshooj II, Ntu A (Cov Khoom Siv). Nws ua raws li qhov yuav tsum tau muaj rau cov hlab ntsha siab, nrog rau cov tshuaj muaj pes tsawg leeg, cov khoom siv kho tshuab, thiab cov txheej txheem kuaj. Kev ua raws li ASME cov qauv ua kom cov khoom tsim nyog rau cov ntawv thov tseem ceeb hauv boilers thiab cov hlab ntsha siab.

Lub hardness ntawm SA-302 Qib B yog dab tsi?

SA-302 Qib B feem ntau muaj qhov nyuaj ntawm 170 txog 200 HB. Qhov nruab nrab hardness no muab qhov sib npaug ntawm lub zog thiab toughness. Nws kuj tso cai rau kom yooj yim machining thiab vuam piv rau cov alloys nyuaj. Lub hardness yog tswj los ntawm kev kho cua sov kom zoo thaum lub sij hawm tsim khoom.

Puas yog SA-302 Qib B puas muaj kev tiv thaiv corrosion zoo?

SA-302 Qib B muaj qhov nruab nrab corrosion tsis kam, feem ntau vim nws cov ntsiab lus alloying. Nws yog qhov tsim nyog rau ntau qhov chaw muaj kev lag luam tab sis yuav xav tau kev tiv thaiv ntxiv, xws li cov coatings lossis hauv ob sab phlu, nyob rau hauv cov mob hnyav heev. Nws qhov kev tiv thaiv yog txaus rau cov kev pab cuam lub nkoj siab nyob rau hauv lub hwj chim thiab petrochemical industries.

Dab tsi yog qhov ceev ntawm SA-302 Qib B?

SA-302 Qib B muaj qhov ceev ntawm kwv yees li 7.85 g / cm³, zoo ib yam li lwm cov carbon thiab cov hlau tsis tshua muaj hlau. This density is consistent with structural and pressure vessel materials, making it easy to calculate weights for design and manufacturing purposes.

Modulus ntawm elasticity ntawm SA-302 Qib B yog dab tsi?

Lub modulus ntawm elasticity rau SA-302 Qib B yog hais txog 29,000 ksi (200 GPa), feem ntau ntawm carbon thiab low-alloy steels. Tus nqi no yog siv rau hauv cov qauv tsim thiab lub siab lub nkoj tsim los xam cov deflection, kev ntxhov siab, thiab lub zog nyob rau hauv kev khiav hauj lwm loads.

SA-302 Qib B puas tuaj yeem siv rau hauv cov ntawv thov kub qis?

Txawm hais tias SA-302 Qib B yog qhov tshwj xeeb rau kev pabcuam kub kub, nws tuaj yeem siv rau qhov kub thiab txias yog tias nws ua tau raws li qhov yuav tsum tau ua kom muaj zog. Txawm li cas los xij, nws tsis yog tsim tshwj xeeb rau cov xwm txheej cryogenic, thiab lwm cov qib yuav tsim nyog rau qhov chaw uas tsis tshua muaj kub.

Dab tsi yog machining yam ntxwv ntawm SA-302 Qib B?

SA-302 Qib B muaj kev ua haujlwm zoo vim nws qhov hnyav nruab nrab thiab cov ntsiab lus alloy. Cov txheej txheem machining kev coj ua rau cov hlau tsis tshua muaj hlau feem ntau siv tau. Cov cuab yeej tsim nyog thiab txiav nrawm raug pom zoo kom ua tiav qhov zoo tshaj plaws thiab lub neej ntawm lub cuab yeej.

SA-302 Qib B tau tshuaj xyuas li cas?

SA-302 Qib B daim hlau yuav raug soj ntsuam ntau yam, suav nrog kev kuaj ultrasonic, kuaj pom, thiab kuaj tshuab. Kev tshuaj ntsuam xyuas tshuaj thiab tensile, cuam tshuam, thiab khoov kev sim kuj tau ua los xyuas kom ua raws li ASME cov qauv. Cov kev tshuaj ntsuam xyuas no xyuas cov khoom zoo thiab cov qauv kev ncaj ncees.