Cov txheej txheem vuam zoo tshaj plaws rau SA387 Qib 12 Steel Phaj

SA 387 Qib 12 Chav Kawm 2 yog ib hom kev weldable, chromium-molybdenum alloy steel phaj tsim rau siab- kub siab lub nkoj thiab boiler daim ntaub ntawv, muab zoo heev tiv taus oxidation, corrosion, thiab siab siab, nrog Class 2 denoting siab mechanical zog (tensile/yield) tshaj Class 1. Nws yog ib tug robust khoom siv nyob rau hauv pe.

SA387 Alloy Steel Gr.12 CL 2 Sheet & Phaj Specification:

Qib sib npaug rau SA387 Alloy Steel Gr.12 CL 2 Daim Ntawv & Phaj

Tshuaj muaj pes tsawg leeg ntawm SA387 Alloy Steel Gr.12 CL 2 Daim Ntawv thiab Phaj

Mechanical Properties For A387 Alloy Steel Gr.12 CL 2 Sheets & Phaj

Kev Ua Haujlwm

1. Kev kho cua sov (Thermal processing)

Raws li ASME SA 387, daim hlau yuav tsum tau kho thermally siv ib qho ntawm cov hauv qab no:

Annealing: Cua sov saum qhov tseem ceeb thiab txias maj mam los txhim kho ductility thiab txo kev ntxhov siab.

Normalizing thiab Tempering (N&T): Cov xwm txheej feem ntau rau qhov yuav tsum tau ua. Qhov tsawg kawg nkaus tempering kub rau Qib 12 yog 1150℃F (620 degree).

quenched thiab Tempered (Q&T): Tso cai tsuas yog nrog kev pom zoo ntawm tus neeg yuav khoom, suav nrog cov kua quenching lossis cua blasting los ntawm qhov kub austenitizing tom qab tempering.

2. Cov txheej txheem vuam

Vim nws cov ntsiab lus alloy, SA 387 Qib 12 xav tau kev saib xyuas tshwj xeeb los tiv thaiv kev sib tsoo thiab ua kom muaj kev sib koom ua ke:

Preheating: Qhov tsawg kawg nkaus preheat kub ntawm 250℃F (120 degree) feem ntau yuav tsum tau, tshwj xeeb tshaj yog rau thicknesses tshaj 5/8 nti (16 mm).

Ntug Kev Npaj: Cov phaj yuav tsum tau beveled (piv txwv li, 60℃V-groove) thiab polished kom tshem tawm cov roj, xeb, thiab noo noo.

Cov txheej txheem: Cov txheej txheem muaj xws li TIG (Gas Tungsten Arc), Stick (SMAW), thiab Submerged Arc Vuam (SAW).

Tom qab-Weld Heat Treatment (PWHT): Qhov tseem ceeb tom qab vuam los txo cov kev ntxhov siab uas seem thiab kho cov khoom siv kho tshuab.

3. Mechanical Properties (Class 2)

Chav Kawm 2 daim hlau yog qhov txawv ntawm qhov yuav tsum tau muaj zog dua piv rau Chav Kawm 1:

Tensile zog: 65 txog 85 ksi (450 txog 585 MPa).

Yield zog (min): 40 ksi (275 MPa).

Elongation (min): 22% hauv 2 ntiv tes (50 mm).

4. Kev tsim khoom & tshuaj xyuas

Txheej Txheem: Cov phaj feem ntau yog tsim los ntawm kub dov.

Kev Ntsuas: Kev Tswj Xyuas Zoo suav nrog Kev Ntsuas Ultrasonic (UT) rau qhov tsis xws luag sab hauv, Charpy Impact Tests (feem ntau ntawm -20℃lossis -46 degree), thiab tshuaj xyuas tshuaj.

Kev kho qhov saum npoo: grooves tuaj yeem ua tiav los ntawm nplaim taws lossis plasma txiav; Txawm li cas los xij, PT (Penetrant Testing) yuav tsum ua raws li kev kuaj xyuas cov kab nrib pleb.

Cov ntawv thov tseem ceeb

Cov hlau no yog cov khoom siv rau cov khoom siv ua haujlwm nyob rau hauv kev ntxhov siab, kev kub siab, thiab kub siab:

Roj & Roj / Petrochemical:Fabrication ntawm reactors, separators, distillation yees, thiab spherical cia tso tsheb hlau luam rau cov roj crude thiab refined khoom.

Kev tsim hluav taws xob:Cov khoom tseem ceeb rau thermal thiab nuclear fais fab nroj tsuag, xws li boiler nruas, chav pipelines, turbine volutes, thiab tshav kub rov qab chav generators (HRSG).

Kev ua tshuaj lom neeg:Kev tsim kho cov khoom siv hluav taws xob, cov hlab ntsha siab, thiab cov hlab ntsha uas muaj siab - cov pa roj los yog corrosive media.

Sour Service Ib puag ncig:Zoo tagnrho rau "kua roj" daim ntawv thov uas cov khoom yuav tsum tiv thaiv hydrogen-induced cracking thiab corrosion los ntawm sulfur compounds.

General Heavy Industry:Siv nyob rau hauv siab -kub ducting, yeeb nkab txhawb nqa, li qub, flanges, thiab fittings.

Core Zoo

SA 387 Qib 12 Chav Kawm 2 muaj ntau yam kev pab cuam tshaj li cov qauv carbon steels xws li SA 516 Qib 70:

Superior High -Tsub Muaj Zog:Qhov sib ntxiv ntawm molybdenum ho txhim kho tensile thiab tawm dag zog ntawm qhov kub txog li 575℃(1067℃F).

Exceptional Corrosion & Oxidation Resistance:Chromium cov ntsiab lus muab cov txheej txheem tiv thaiv uas tiv taus pitting, crevice corrosion, thiab oxidation hauv kev xav tau kev lag luam ib puag ncig.

Higher Mechanical Performance (Class 2 vs. Class 1):Chav Kawm 2 tshwj xeeb yog cua sov- kho kom muaj zog tensile ntau dua (450–585 MPa) thiab lub zog tawm los (Ntau dua lossis sib npaug li 275 MPa) piv rau Chav Kawm 1, tso cai rau cov phab ntsa ntawm cov hlab ntsha thinner dua.

Zoo heev Weldability thiab Formability:Txawm hais tias nws lub zog siab, cov hlau tseem nyob tau yooj yim weldable thiab fabricable, uas yog qhov tseem ceeb rau kev tsim cov txheej txheem kev lag luam.

Reliability & Longevity:Paub txog nws cov kav ntev thiab ua haujlwm rau thermal qaug zog, nws ua kom cov kev pabcuam ruaj khov nyob rau lub sijhawm ua haujlwm ntev, txo cov nqi tu.

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.

ASME SA 387 Qib 12 Chav Kawm 2 yog dab tsi?

ASME SA 387 Qib 12 Chav Kawm 2 yog qis- alloy chromium-molybdenum (Cr-}Mo) steel phaj specification tsim los ntawm American Society of Mechanical Engineers (ASME). Nws yog tsim los rau siab kub thiab siab kev pab cuam, feem ntau yog siv nyob rau hauv boiler, siab hlab ntsha, thiab piping daim ntaub ntawv uas tsis kam mus creep, oxidation, thiab siab - kub yuav tsum tau.

Cov tshuaj muaj pes tsawg leeg ntawm SA 387 Qib 12 Chav Kawm 2 yog dab tsi?

Cov tshuaj lom neeg muaj pes tsawg leeg (qhov hnyav %) yog raws li nram no: Carbon (C) 0.05-0.17%, Manganese (Mn) 0.40-0.65%, Phosphorus (P) Tsawg dua lossis sib npaug li 0.035%, Sulfur (S) Tsawg dua lossis sib npaug li 0.035%, Silicon (Si) 0.015-Chromium). 0.80-1.25%, Molybdenum (Mo) 0.45-0.60%, thiab tshuav nyiaj li cas yog hlau (Fe). Cov ntsiab lus taug qab tuaj yeem muaj nyob rau hauv cov kev txwv uas siv tau raws li ASME cov qauv.

Yam tsawg kawg nkaus txhua yam khoom ntawm SA 387 Qib 12 Chav Kawm 2 yog dab tsi?

Nyob rau hauv chav tsev kub, qhov tsawg kawg nkaus txhua yam khoom yog: Tensile zog (σ) Ntau tshaj los yog sib npaug rau 415 MPa (60,000 psi), Yield zog (σ) Ntau tshaj los yog sib npaug rau 205 MPa (30,000 psi), Elongation (nyob rau hauv 200 mm) Ntau tshaj los yog sib npaug rau 22%, thiab txo ntawm thaj tsam ntau tshaj 50%. Cov txiaj ntsig no siv tau rau cov khoom siv hauv qhov normalized thiab tempered.

Yuav tsum tau kho cua sov dab tsi rau SA 387 Qib 12 Chav Kawm 2?

Kev kho cua sov yuav tsum tau ua rau SA 387 Qib 12 Chav Kawm 2 yognormalizing thiab tempering. Normalization yog ua ntawm qhov kub ntawm 890-940℃(1635-1725℃F), tom qab ntawd cua txias. Tempering yog ua nyob rau ntawm qhov tsawg kawg nkaus kub ntawm 620℃(1150℃F), nrog rau lub sij hawm tuav txaus los xyuas kom meej qhov kub thiab txias thoob plaws hauv lub phaj, ces txias hauv huab cua los yog dej.

Qhov kev pab kub siab tshaj plaws rau SA 387 Qib 12 Chav Kawm 2 yog dab tsi?

SA 387 Qib 12 Chav Kawm 2 yog tsim rau kev pabcuam txuas ntxiv ntawm qhov kub siab txog li 593℃(1100℃F). Tshaj qhov kub no, nws lub zog creep thiab oxidation kuj yuav degrade, txwv nws lub sij hawm ntev - kev ua tau zoo.

Dab tsi yog cov kev siv feem ntau ntawm SA 387 Qib 12 Chav Kawm 2?

Nws yog dav siv nyob rau hauv siab - kub, siab - cov khoom siv siab, xws li: Boiler nruas thiab headers, Siab hlab ntsha rau petrochemical, refinery, thiab fais fab kev lag luam, Piping systems rau chav thiab cov txheej txheem kua, Rauv Cheebtsam, thiab Thaum tshav kub kub exchangers.

SA 387 Qib 12 Chav Kawm 2 txawv li cas ntawm Chav Kawm 1 ntawm tib qib?

Qhov tseem ceeb sib txawv yog nyob rau hauv toughness xav tau. SA 387 Qib 12 Chav Kawm 2 muaj kev nruj dua Charpy V-notch (CVN) cuam tshuam rau qhov yuav tsum tau muaj zog piv rau Chav Kawm 1. Chav 2 feem ntau yuav tsum muaj qhov tsawg kawg nkaus CVN tus nqi ntawm 27 J (20 ft-lb) ntawm -18℃(0℃F), thaum Chav Kawm 1 yuav muaj qis dua lossis tsis muaj qhov yuav tsum tau ua.

Dab tsi yog qhov txawv ntawm ASME SA 387 thiab ASTM A 387?

ASME SA 387 thiab ASTM A 387 yog technically zoo tib yam nyob rau hauv cov nqe lus ntawm tshuaj muaj pes tsawg leeg thiab txhua yam khoom. Qhov txawv tsuas yog lawv daim ntawv thov: ASME SA 387 yog ib feem ntawm ASME Boiler thiab Pressure Vessel Code (BPVC), siv rau cov khoom siv tau ntawv pov thawj rau ASME cov qauv. ASTM A 387 yog ib qho dav dav - lub hom phiaj tus qauv rau cov ntawv thov kev lag luam tsis xav tau ASME ntawv pov thawj. Cov neeg tsim khoom feem ntau tsim cov khoom siv uas ua tau raws li ob qho tib si qauv.

Dab tsi yog qhov creep zog ua tau zoo ntawm SA 387 Qib 12 Chav Kawm 2 ntawm qhov kub siab?

SA 387 Qib 12 Chav Kawm 2 qhia txog kev txhim khu kev ntseeg siab ntawm kev pabcuam kub txog 593℃(1100℃F). Piv txwv li, ntawm 538℃(1000℃F), nws 100,000-teev creep rupture zog yog kwv yees li 34.5 MPa (5,000 psi), uas yog txaus rau feem ntau nruab nrab- kub-siab daim ntaub ntawv xws li refinery heaters thiab chav boilers. Creep zog txo qis nrog nce kub tshaj 593℃(1100℃F) vim muaj kev hloov microstructural.

SA 387 Qib 12 Chav Kawm 2 puas tuaj yeem ua tau txias-?

Nws tuaj yeem ua tau txias - tsim, tab sis nws cov ductility ntawm chav tsev kub yuav tsum tau ceev faj tuav. Kev ua kom txias yuav tsum tau ua ntawm qhov kub siab tshaj -18℃(0℃F) kom tsis txhob muaj kev puas tsuaj, thiab cov khoom siv yuav tsum tsis txhob raug strained dhau nws lub zog tawm los ntau dhau. Kev kho cua sov tom qab yuav tsum yog qhov tsim nyog yog tias cov txheej txheem tsim qhia txog kev ntxhov siab tseem ceeb, tshwj xeeb tshaj yog rau cov khoom siv hauv kev pabcuam siab.