SA 387 Gr.22 Cl.1 hais txog Chrome-Moly alloy steel phaj (ASTM A/ASME SA 387) rau siab -kub siab cov hlab ntsha, muaj li ntawm 2.25% Chromium thiab 1% Molybdenum, nrog rau Chav Kawm 1 qhia qis zog tensile (60-85 ksi) piv rau Chav Kawm 2 (75ksi thiab corrosion kuj zoo) roj, roj, thiab fais fab kev lag luam.
Sib npaug rau ASME SA387 Qib 22 Alloy Steel Phaj
| BS | EN | ASTM/ASME | DIN |
| 622-515B | 10 ZPO 910 | SA387-22-1 | 10 ZPO 910 |
Specifications rau ASME SA387 Qib 22 Alloy Steel Phaj
| Lub npe | Nominal Chromium Cov ntsiab lus (%) |
Nominal Molybdenum Cov ntsiab lus (%) |
| SA387 Qib 22 | 2.25% | 1.00% |
Tensile Requirements rau ASME SA387 Qib 22 Alloy Steel Phaj Chav Kawm 1 Phaj
| Lub npe: | Yuav tsum tau: | Qib 22 |
| SA387 Qib 22 | Tensile zog, ksi [MPA] | 75 txog 100 [515 rau 690] |
| Yield zog, min, ksi [MPa] / (0.2% offset) | 45 [310] | |
| Elongation hauv 8 nti. [200mm], min % | ... | |
| Elongation hauv 2 nti. [50mm], min, % | 18 | |
| Txo thaj tsam, min% | 45 ( ntsuas ntawm cov qauv puag ncig) 40 ( ntsuas ntawm cov qauv tiaj tus) |
Cov Khoom Siv Tshuaj Rau ASME SA387 Qib 22 Alloy Steel Phaj
| Element | Chemical Composition (%) | |
| SA387 Qib 22 | ||
| Cov pa roj carbon: | Kev Ntsuas Kub: | 0.05 - 0.15 |
| Product Analysis: | 0.04 - 0.15 | |
| Manganese: | Kev Ntsuas Kub: | 0.30 - 0.60 |
| Product Analysis: | 0.25 - 0.66 | |
| Phosphorus: | Kev Ntsuas Kub: | 0.035 |
| Product Analysis: | 0.035 | |
| Sulfur (max): | Kev Ntsuas Kub: | 0.035 |
| Product Analysis: | 0.035 | |
| Silicon: | Kev Ntsuas Kub: | 0.50 max |
| Product Analysis: | 0.50 max | |
| Chromium: | Kev Ntsuas Kub: | 2.00 - 2.50 |
| Product Analysis: | 1.88 - 2.62 | |
| Molybdenum: | Kev Ntsuas Kub: | 0.90 - 1.10 |
| Product Analysis: | 0.85 - 1.15 |
cov kauj ruam tseem ceeb
SA 387 Qib 22 Chav Kawm 1 yog Cr-Mo alloy steel phaj teev nyob rau hauv ASME, tsim los rau siab - kub thiab siab - kev pabcuam siab. Nws cov khoom ntws tau tsom mus rau kev txhim kho steel huv huv thiab ua kom cov khoom siv kho tshuab ruaj khov. Cov kauj ruam tseem ceeb yog raws li nram no:
Them thiab Hluav Taws Xob Arc Rauv (EAF) Melting
Cov ntaub ntawv nyoos yog faib raws li cov tshuaj muaj pes tsawg leeg uas yuav tsum tau muaj, nrog rau kev txwv nruj ntawm cov sulfur, phosphorus, thiab tramp cov ntsiab lus (Sb, Sn, thiab lwm yam) kom tsis txhob muaj kev kub ntxhov thiab txo cov corrosion kuj. Cov ntaub ntawv raug them yog yaj hauv EAF kom tshem tawm cov impurities thawj zaug. Rau cov ntawv thov, cov txheej txheem thib ob xws li electroslag remelting (ESR) yuav raug siv los txhim kho purity ntxiv.
LF (Ladle Rauv) Refining
Cov hlau molten raug xa mus rau LF rau kev kho kub thiab tshuaj lom neeg muaj pes tsawg leeg. Refining txo cov kev suav nrog thiab ua kom muaj kev sib faib ntawm cov ntsiab lus tseem ceeb xws li chromium thiab molybdenum, ua tau raws li cov lus qhia nruj ntawm SA 387 Gr.22 Cl 1.
VD (Nqus Degassing) Kev Kho Mob
Cov hlau refined yog raug rau lub tshuab nqus tsev degassing kom tshem tawm hydrogen, oxygen, thiab lwm yam gases. Cov kauj ruam no txo qhov kev pheej hmoo ntawm porosity, cov kab nrib pleb sab hauv, thiab hydrogen- cuam tshuam qhov tsis xws luag, uas yog qhov tseem ceeb rau kev ua kom muaj kev ntseeg siab nyob rau hauv siab - kub thiab siab - siab.
Casting thiab Tswj Rolling
Cov hlau degassed yog cam khwb cia rau hauv slabs. Kev tswj dov yog tom qab ntawd siv, nrog kev tswj xyuas qhov kub thiab txias kom ua kom zoo dua cov qauv nplej thiab txhim kho cov cuab yeej cuab tam uniformity. Lub slab yog dov mus rau lub hom phiaj tuab, feem ntau txwv kom tsawg dua lossis sib npaug li 150 mm rau qib no.
Kev kuaj ultrasonic (UT)
Raws li cov khoom siv hauv chav kawm 1, cov phiaj xwm tau soj ntsuam nruj ultrasonic txhawm rau txheeb xyuas cov teeb meem sab hauv xws li laminations, tawg, thiab kev suav nrog pawg. Txhua qhov chaw tsis tuaj yeem raug tshem tawm lossis lub phaj raug tsis lees paub los xyuas kom muaj suab nrov sab hauv.
Normalizing thiab tempering
Qhov no yog ib theem tseem ceeb rau kev ua tiav qhov xav tau microstructure thiab cov khoom.
Normalization:
Lub phaj yog rhuab mus rau qhov tsim nyog kub, tuav, thiab ces txias (cua txias los yog ceev cua txias yuav siv tau) kom refine nplej thiab homogenize cov qauv.
Tempering:
Qhov tsawg kawg nkaus tempering kub ntawm 675℃feem ntau yog siv los txo cov kev ntxhov siab uas seem, sib npaug zog thiab tawv, thiab ruaj khov microstructure.
Kev Ua tiav thiab Kev Ntsuas Kev Ua Haujlwm
Cov phaj yog txiav, ncaj, thiab nto -ua kom haum raws li qhov yuav tsum tau muaj qhov zoo thiab qhov zoo. Kev ntsuam xyuas kev siv tshuab (tensile, yield, impact) thiab corrosion- txheeb xyuas kev txheeb xyuas, nrog rau kev txheeb xyuas cov tshuaj muaj pes tsawg leeg. Tsuas yog daim hlau uas dhau tag nrho cov kev soj ntsuam raug tso tawm rau kev xa khoom.
Qhov zoo:
Lub Zog Kub Kub:Txhim kho los ntawm molybdenum, nws tuav lub zog tensile zoo tshaj plaws thiab tiv thaiv nkag ntawm qhov kub siab (txog li 600 degree).
Corrosion & Oxidation Resistance:Cov ntsiab lus chromium muab kev tiv thaiv zoo heev rau oxidation thiab corrosion, tseem ceeb heev rau kev nruj heev.
Sour Service Muaj peev xwm:Zoo- haum rau cov ntawv thov uas muaj cov roj qaub (hydrogen sulfide), muaj nyob hauv cov roj & roj.
Zoo Weldability:Tau welded zoo, txawm nyob rau ntawm qhov kub thiab txias, txawm tias Chav Kawm 2 (normalized & tempered) muaj zog dua.
Tus nqi -Txoj kev zoo rau siab -Tseem xav tau:Muab qhov sib npaug ntawm kev ua tau zoo thiab tus nqi rau kev xav tau ntawm cov hlau tsis muaj steel yuav dhau mus.
Raws li -Rolled Condition (Class 1):Feem ntau muab khoom siv yam tsis muaj kev kho cua sov ntxiv, muab cov khoom siv kho kom zoo (lub zog) rau ntau daim ntawv thov ntawm tus nqi qis dua Chav Kawm 2.
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.
SA 387 Gr.22 Cl 1 yog dab tsi?
SA 387 Gr.22 Cl 1 yog lub siab lub nkoj steel phaj ua los ntawm chromium-molybdenum (Cr-Mo) alloy. Nws tau teev nyob rau hauv ASME Boiler thiab Pressure Vessel Code thiab yog dav siv nyob rau hauv siab - kub thiab siab - kev siv siab. Cov khoom muaj lub zog zoo creep, oxidation tsis kam, thiab toughness, ua rau nws haum rau boilers, tshav kub exchangers, thiab refinery khoom. Qhov "Class 1" npe txhais tau tias nws yuav tsum ua kom tau raws li kev soj ntsuam nruj dua ultrasonic rau cov suab nrov sab hauv.
Dab tsi yog cov ntsiab lus alloying?
Cov ntsiab lus tseem ceeb alloying yog chromium thiab molybdenum. Chromium txhim kho oxidation tsis kam thiab siab - kub lub zog, thaum molybdenum txhim khu kev nkag siab thiab muab kev ruaj ntseg nyob rau hauv ntev - lub sij hawm thermal loading. Cov ntsiab lus no ua haujlwm ua ke kom ntseeg tau tias cov hlau tuaj yeem tiv taus qhov kub thiab txias yam tsis muaj degradation tseem ceeb. Lwm cov ntsiab lus xws li carbon, manganese, thiab silicon kuj tau ua tib zoo tswj kom tswj tau qhov weldability thiab mechanical zog.
Kev kho cua sov siv li cas?
SA 387 Gr.22 Cl 1 feem ntau yog kho cua sov los ntawm normalization tom qab tempering. Normalization muaj cua sov cov hlau mus rau qhov kub ntawm 890-940 degree, tuav nws kom ruaj khov, thiab tom qab ntawd txias hauv huab cua. Cov txheej txheem no refines lub grain qauv thiab txhim kho toughness. Tempering yog ua tiav ntawm qhov tsawg kawg nkaus ntawm 675℃kom txo cov kev ntxhov siab seem, txhim kho ductility, thiab ruaj khov microstructure. Qhov ntsuas kub yuav txawv raws li phaj thickness thiab cov chaw tsim khoom siv.
"Class 1" txhais li cas?
"Class 1" qhia tias cov hlau phaj yuav tsum tau mus rau qib siab dua ntawm kev kuaj ultrasonic (UT) piv rau Chav Kawm 2. Qhov kev soj ntsuam nruj dua no ua kom cov khoom muaj qhov tsis xws luag sab hauv xws li laminations, suav nrog, lossis voids. Lub hom phiaj yog los muab cov khoom siv txhim khu kev qha ntau dua rau kev siv cov hlab ntsha tseem ceeb uas qhov kev ncaj ncees yog qhov tseem ceeb. Cov phaj uas tsis ua raws li cov qauv 1 yuav raug muab faib ua Chav Kawm 2 yog tias lawv ua tau raws li qhov yuav tsum tau ua kom qis dua.
Qhov txawv ntawm SA 387 Gr.22 Class 1 thiab Class 2 yog dab tsi?
Qhov sib txawv tseem ceeb yog qib ntawm kev tshuaj xyuas ultrasonic. Chav Kawm 1 xav kom UT nruj dua kom ntseeg tau tias tsawg dua qhov tsis xws luag xws li laminations lossis suav nrog. Chav Kawm 2 muaj cov qauv tshuaj ntsuam xyuas yooj yim dua. Chav Kawm 1 feem ntau yog xaiv rau cov khoom tseem ceeb ntawm cov hlab ntsha uas muaj kev ntseeg siab yog qhov tseem ceeb, thaum Chav Kawm 2 yuav raug siv rau hauv qhov chaw tsis tshua muaj teeb meem.
SA 387 Gr.22 Cl 1 piv rau carbon steel daim hlau li cas?
Tsis zoo li cov qauv carbon steels, SA 387 Gr.22 Cl 1 muaj chromium thiab molybdenum, uas ua rau nws muaj zog kub kub, creep tsis kam, thiab tsis kam mus rau temper embrittlement. Carbon steels soften thiab poob lub zog ntawm qhov kub siab, ua rau lawv tsis haum rau ntau lub nkoj siab thiab boiler daim ntawv thov qhov twg Gr.22 excels.
Dab tsi yog qhov txawv ntawm SA 387 Gr.22 Cl 1 thiab SA 516 Gr.70?
SA 516 Gr.70 yog cov pa roj carbon steel uas tsim los rau qis rau nruab nrab kub siab lub nkoj kev pabcuam, thaum SA 387 Gr.22 Cl 1 yog Cr Mo alloy steel rau kev siv kub. SA 516 Gr.70 muaj zoo toughness nyob rau hauv qis kub tab sis tsis muaj creep zog thiab oxidation tsis kam ntawm Gr.22. Gr.22 yog siv nyob rau hauv refineries thiab fais fab nroj tsuag, thaum SA 516 Gr.70 yog muaj nyob rau hauv cia tso tsheb hlau luam thiab tsis kub cov hlab ntsha.