ASTM A387 Qib 22 Chav Kawm 2yog chromium-molybdenum alloy steel phaj siv rau siab- kub, siab- cov ntawv siv siab xws li cov welded boilers thiab cov hlab ntsha siab hauv cov roj, roj, thiab tshuaj lom neeg kev lag luam, paub txog nws zoo heev corrosion / oxidation kuj thiab lub zog, muab nyob rau hauv normalized thiab tempered mob nrog siab tensile zog yuav tsum tau ntau tshaj li 1% Crrom 2 ntsiab lus. ~ 1.00% Molybdenum (Mo), nrog rau cov khoom siv tshwj xeeb xws li 75-100 ksi tensile zog thiab 45 ksi yield zog.
Specifications rau ASTM A387 Qib 22 Alloy Steel Phaj
| Lub npe | Nominal Chromium Cov ntsiab lus (%) | Nominal Molybdenum Cov ntsiab lus (%) |
| A387 Qib 22 | 2.25% | 1.00% |
A387 Gr.22 CL.2Tshuaj muaj pes tsawg leeg | |||||||
Qib | Cov ntsiab lus Max (%) | ||||||
C | Si | Mn | P | S | Cr | Mo | |
A387 Gr.22 Cl.2 | 0.04-0.15 | 0.50 | 0.30-0.60 | 0.035 | 0.035 | 1.88-2.62 | 0.85-1.15 |
Qib | A387 Gr.22 CL.2Mechanical Property | |||
Thickness | Yield | Tensile | Elongation | |
A387 Gr.22 Cl.2 | mm | Min Mpa | Mpa | Tsawg% |
t Tsawg dua lossis sib npaug li 50 | 310 | 515-690 | 18 | |
50<> | - | - | - | |
Sib npaug rau ASTM A387 Qib 22 Alloy Steel Phaj
| BS | EN | ASTM / ASME Cov | DIN |
| 622-515B | 10 ZPO 910 | A387-22-2 | 10 ZPO 910 |
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1. Kev kho cua sov (Core Processing)
Raws li ASTM A387 specification, Qib 22 Chav Kawm 2 yuav tsum raug tua hlau thiab xav tau kev kho cua sov tshwj xeeb kom ua tiav nws cov khoom siv tshuab:
Txoj kev: Feem ntau ua tiav ntawm Normalizing thiab Tempering (N + T) lossis Quenching thiab Tempering (Q + T).
Tempering Kub: Qhov ntsuas kub tsawg kawg nkaus yuav tsum yog tsawg kawg 675 ° C (1250 ° F) kom ntseeg tau cov qauv kev ruaj ntseg.
Chav Kawm 2 Lub Zog: Tsis zoo li Chav Kawm 1, Chav Kawm 2 yuav tsum tau ua kom txias sai dua (normalization lossis quenching) kom ua tiav lub zog tensile ntau dua.
2. Mechanical Property Requirements (Class 2)
Tensile zog: 515-690 MPa (75-100 ksi).
Tawm Zog: Tsawg kawg 310 MPa (45 ksi).
Elongation: Tsawg kawg 18% (hauv 2 ntiv tes).
3. Vuam thiab PWHT (Post-Kev kho cua sov)
Vim yog cov ntsiab lus Cr thiab Mo siab, cov khoom no raug rau huab cua - khov thiab txias tawg.
Preheating: Qhov tseem ceeb los tiv thaiv hydrogen-induced cracking. Preheating kub yog txiav txim los ntawm phaj thickness.
PWHT: Yuav tsum tau ua tom qab vuam los txo cov kev ntxhov siab thiab txhim kho cov ductility thiab toughness ntawm Weld Hlau (WM) thiab Heat Afected Zone (HAZ).
Consumables: Feem ntau welded siv cov hlau muab tub lim zoo li E8018-B2 lossis ER80S-B3 kom phim lub hauv paus hlau chemistry.
4. Cov yam ntxwv tseem ceeb
Kev tiv thaiv rau Hydrogen: Cr-Mo ua ke muab kev tiv thaiv zoo heev rau hydrogen nres thiab oxidation ntawm qhov kub thiab txias.
Daim ntaub ntawv: Feem ntau yog siv rau hauv cov roj thiab roj refineries (hydrocracking units), fais fab nroj tsuag nruas, thiab cua kub exchangers.
Cov ntawv thov tseem ceeb:
Petrochemicals: Fabrication of hydroprocessing reactors (hydrocrackers), desulfurization units, thiab refining towers.
Lub zog tiam: Siab-kub cov kav dej, lub tshuab nqus tsev, thiab lub taub hau boiler.
Cov nkoj siab: Hnyav- cov nkoj ua haujlwm tuav siab- qhov kub thiab txias, siab - siab, thiab acidic ib puag ncig (sulfur/hydrogen).
Thaum tshav kub kub Exchange: Kub exchangers thiab reheaters ua hauj lwm nyob rau hauv ntau ntawm 350 ° C mus rau 600 ° C.
Vim li cas thiaj xaiv peb:
Koj tuaj yeem tau txais cov khoom zoo meej raws li qhov koj xav tau ntawm tus nqi tsawg kawg nkaus.
Peb kuj muab Reworks, FOB, CFR, CIF, thiab qhov rooj rau qhov rooj tus nqi xa khoom. Peb xav kom koj ua deal rau shipping uas yuav zoo heev.
Cov ntaub ntawv uas peb muab yog muaj tseeb tiag, txoj cai los ntawm raw cov ntaub ntawv xeem daim ntawv pov thawj mus rau qhov kawg dimensional nqe lus.
Peb lav muab cov lus teb tsis pub dhau 24 teev (feem ntau hauv tib lub sijhawm)
Koj tuaj yeem tau txais cov khoom hloov pauv, zeb xa khoom nrog txo lub sijhawm tsim khoom.
Peb tau mob siab rau peb cov neeg siv khoom. Yog tias nws yuav tsis tuaj yeem ua tau raws li koj cov kev xav tau tom qab kuaj xyuas tag nrho cov kev xaiv, peb yuav tsis ntxias koj los ntawm kev cog lus tsis tseeb uas yuav tsim kev sib raug zoo rau cov neeg siv khoom.
Thov kom muaj kev tshaj lij rau ASTM A387 Qib 22 Chav Kawm 2 los ntawm GNEE Steel.
A387 Qib 22 Chav Kawm 2 puas tuaj yeem siv rau hauv hydrogen-muaj ib puag ncig?
Yog lawm, nws tsim nyog rau siab - kub thiab siab - kev pabcuam hydrogen. Nws Cr-Mo muaj pes tsawg leeg tuaj yeem tiv thaiv hydrogen embrittlement thaum kho cua sov kom zoo, ua kom muaj kev nyab xeeb.
Dab tsi yog qhov nyuaj ntawm A387 Qib 22 Chav Kawm 2 tom qab PWHT?
Tom qab tsim nyog PWHT, nws qhov hardness feem ntau yog li ntawm 180 txog 220 HBW. Qib hardness no ua kom zoo toughness thiab ductility rau cov ntawv thov kev lag luam.
Qhov kev pabcuam kub li cas ntawm A387 Qib 22 Chav Kawm 2 piv rau 316L stainless hlau?
Qib 22 Chav Kawm 2 muaj qhov kub siab tshaj qhov kev pabcuam (593 ° C vs 450 ° C ntawm 316L). Tab sis 316L outperforms nws nyob rau hauv corrosion kuj tiv thaiv aggressive media xws li chlorides.
Dab tsi yog qhov pom zoo ua ntej kub rau vuam A387 Qib 22 Chav Kawm 2?
Qhov pom zoo ua kom sov sov yog li ntawm 150 ° C mus rau 200 ° C (302 ° F txog 392 ° F), uas txawv raws li cov khoom tuab thiab cov txheej txheem vuam tshwj xeeb tau txais los xyuas kom zoo vuam zoo.
Dab tsi yog qhov txawv ntawm cov khoom siv ntawm A387 Qib 22 Chav Kawm 2 thiab carbon steel (A516 Qib 70)?
Qib 22 Chav Kawm 2 raug nqi ntau dua A516 Qib 70 vim yog chromium thiab molybdenum. Tus nqi hwm yog tsim nyog rau nws qhov siab tshaj -kub kev ua haujlwm hauv cov ntawv thov tseem ceeb.
Yuav ua li cas cuam tshuam toughness ntawm A387 Qib 22 Chav Kawm 2 piv rau A387 Qib 5 Chav Kawm 2 ntawm qhov kub thiab txias (-20 ° C) li cas?
Lawv qhov qis- qhov kub thiab txias cuam tshuam toughness zoo ib yam, tab sis Qib 22 Chav Kawm 2 zoo dua me ntsis vim yog cua sov- kho kom zoo dua microstructure. Ob leeg tsis haum rau kev pabcuam hauv qab -29 ° C.
Dab tsi yog qhov tsawg kawg nkaus tensile lub zog ntawm A387 Qib 22 Chav Kawm 2 raws li cov qauv ASTM?
Raws li ASTM A387, nws lub zog tensile yam tsawg kawg nkaus yog 415 MPa (60,000 psi), thiab qhov tsawg kawg nkaus lub zog tawm mus txog 205 MPa (30,000 psi), ua tau raws li cov txheej txheem rau kev siv lub nkoj siab.
Dab tsi yog qhov txiaj ntsig tseem ceeb ntawm A387 Qib 22 Chav Kawm 2 tshaj cov hlau hauv siab - qhov kub thiab txias?
Piv nrog cov pa roj carbon steel, nws muaj kev nkag tau zoo dua thiab oxidation tsis kam ntawm qhov kub siab, tsis txhob deformation thiab degradation ntev - kev pab cuam lub sij hawm, yog li ua kom ruaj khov kev ua tau zoo nyob rau hauv siab - qhov kub thiab txias scenarios.
A387 Qib 22 Chav Kawm 2 puas tuaj yeem siv rau hauv hydrogen-muaj ib puag ncig?
Yog lawm, nws tsim nyog rau siab - kub thiab siab - kev pabcuam hydrogen. Nws Cr-Mo muaj pes tsawg leeg tuaj yeem tiv thaiv hydrogen embrittlement thaum kho cua sov kom zoo, ua kom muaj kev nyab xeeb.
Dab tsi yog qhov nyuaj ntawm A387 Qib 22 Chav Kawm 2 tom qab PWHT?
Tom qab tsim nyog PWHT, nws qhov hardness feem ntau yog li ntawm 180 txog 220 HBW. Qib hardness no ua kom zoo toughness thiab ductility rau cov ntawv thov kev lag luam.