ASME SA387 Qib 12 Chav Kawm 2phaj yog chromium-molybdenum alloy steel phaj them los ntawm ASME SA-387 / SA-387M specification, tsim tshwj xeeb rau welded boilers thiab cov hlab ntsha siab uas ua haujlwm ntawm qhov kub siab. Qhov "Qib 12" txhais tau hais tias muaj kev sib xyaw ua ke los ntawm cov ntsiab lus chromium thiab molybdenum, uas ua rau lub zog kub kub zoo, nkag siab tsis kam, thiab oxidation tsis kam. "Class 2" qhia tau hais tias cov khoom yog muab nyob rau hauv lub normalized thiab tempered mob, uas ua rau muaj zog thiab toughness ntau dua piv rau cov annealed Class 1. Cov tshuaj muaj pes tsawg leeg yog nruj me ntsis tswj los xyuas kom meej cov khoom, nrog rau cov kev txwv ntawm carbon, silicon, manganese, phosphorus, sulfur, chromium, thiab molybdenum. Cov khoom siv kho tshuab yog cov yam ntxwv zoo tensile thiab yield zog, tsim nyog ductility, thiab ib tug tsim nyog hardness theem, ua cov khoom haum rau withstanding cov kev ntxhov siab thiab thermal cycles ntsib nyob rau hauv high-temperature kev pab cuam. Cov phaj yog tsim nyob rau hauv ntau yam ntawm cov qauv thicknesses, dav, thiab ntev, thiab kev kho cua sov feem ntau yuav normalizing ua raws li tempering los kho cov microstructure thiab optimize qhov sib npaug ntawm lub zog thiab toughness yuav tsum tau rau kev siv cov hlab ntsha.
SA 387 GR.12 Qib sib npaug:
| BS | ASTM/ASME | UNS | EN | DIN |
| 620B | A387/SA 387 | K11757 | 3 ZPO 45 | 13 ZPO 44 |
Tshuaj muaj pes tsawg leeg ntawm SA387 GR.12 CL.2 Phaj
| C | Mn | P | S | Si | Cr | Mo |
| 0.04 - 0.17 | 0.35 - 0.73 | 0.035 | 0.035 | 0.13 - 0.45 | 0.74 - 1.21 | 0.4 - 0.65 |
Mechanical Properties ntawm SA 387 GR.12 CL.2 Phaj
| Tensile zog | Yield zog | Elongation hauv 200mm (%) | Elongation hauv 50mm (%) |
| 65-85 ksi, 450-585 MPa | 40 Ksi, 275 MPa | 19 |
22 |
ASME SA 387 Qib 12 Chav Kawm 2 steel phaj feem ntau raug rau kev kho cua sov ntawm normalizing raws li tempering. Nyob rau hauv cov xwm txheej uas yuav tsum tau tshwj xeeb, xws li daim hlau tuab los yog siab toughness xav tau, cov txheej txheem yuav muaj xws li normalizing, ceev ceev txias (xws li dej quenching), thiab ces tempering. Cov txheej txheem no ua kom cov khoom muaj lub zog tsim nyog, toughness, thiab corrosion kuj rau kev pab cuam nyob rau hauv high-temperature thiab hydrogenation ib puag ncig, ua tau raws li qhov yuav tsum tau ntawm cov hlab ntsha thiab boilers.
Normalizing:
Lub phaj steel yog rhuab mus rau qhov kub siab tshaj qhov austenitizing ntau thiab ces txias hauv huab cua. Cov kauj ruam no refines cov qauv nplej, homogenizes microstructure, thiab relieves residual stresses los ntawm casting los yog dov.
Tempering:
Tom qab normalizing, tempering yog ua nyob rau hauv ib tug qis kub kom txo cov kev ntxhov siab nyob rau hauv lub sab hauv, txhim kho toughness, thiab ua tau raws li xav tau kev sib xyaw ntawm txhua yam khoom.
Kev kho tshwj xeeb (yeem):
Rau cov phaj tuab, cov txheej txheem ntawm normalizing, txias ceev (xws li dej quenching), thiab tempering yuav siv tau kom ua tau zoo dua toughness thiab microstructure.
Lub hom phiaj:
Txhim khu kev tiv thaiv rau embrittlement thiab txhim kho qis-kub los cuam tshuam toughness.
Muab kev ua haujlwm kub zoo nrog rau kev tiv thaiv oxidation thiab corrosion.
Haum rau cov ntawv thov hauv kev lag luam roj thiab roj, suav nrog hydrogenation reactors, cov khoom siv refinery, thiab cov roj ua haujlwm.
Cov ntawv thov tseem ceeb:
Roj & Roj Kev Lag Luam
ASME SA 387 Qib 12 Chav Kawm 2 daim hlau yog dav siv nyob rau hauv ib puag ncig kev pabcuam qaub, qhov uas tiv thaiv hydrogen sulfide thiab cov ntaub ntawv cuam tshuam ntawm corrosion thiab embrittlement yog qhov tseem ceeb. Lawv tau ua haujlwm nyob rau hauv ob qho tib si offshore thiab onshore cov chaw, nrog rau cov platforms, cov chaw ua haujlwm, thiab cov khoom siv xws li reactors, separators, thiab cov hlab ntsha siab koom nrog hauv hydrocarbon ntau lawm, refining, thiab roj ua.
Lub zog tiam
Cov phaj no feem ntau tau teev tseg rau chav boilers, cua sov rov qab chav generators (HRSG), thermal fais fab chaw nres tsheb, thiab turbine- hais txog cov khoom. Lawv lub peev xwm los tuav lub zog thiab ruaj khov ntawm qhov kub siab ua rau lawv haum rau kev tiv thaiv qhov siab - siab thiab siab - qhov kub thiab txias ntawm cov tshuab tsim hluav taws xob.
Kev ua tshuaj lom neeg
Hauv kev lag luam tshuaj, SA 387 Qib 12 Chav Kawm 2 yog siv rau hauv cov reactors, cov hlab ntsha siab, thiab cov khoom siv hluav taws xob uas siv cov tshuaj lom neeg thiab ua haujlwm raws li qhov xav tau ntawm qhov kub thiab txias. Cov khoom siv tiv thaiv kev nkag mus, thermal qaug zog, thiab oxidation ua rau muaj kev ntseeg siab ntev - lub sijhawm ua haujlwm hauv cov ntawv thov no.
General Industrial
Tshaj li lub zog thiab tshuaj lom neeg, cov phiaj no pom kev siv ntau yam khoom siv hauv kev lag luam, suav nrog cov tso tsheb hlau luam, cov kav dej kub, cov khoom sib cais, cov boilers, thiab ntau lub nkoj siab. Lawv ua ke ntawm lub zog, toughness, thiab weldability ua rau lawv muaj ntau yam kev xaiv rau tuav - kub thiab siab - kev pab cuam nyob rau hauv ntau hom kev lag luam chaw.
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.
Yog tias koj xav paub ntxiv txog (ASME SA387 Qib 12 Chav Kawm 2) GNEE cov khoom, koj tuaj yeem xa email rau beam@gneesteelgroup.com. Peb zoo siab tshaj los pab koj.
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?
Qhov yuav tsum tau kho cua sov rau SA 387 Qib 12 Chav Kawm 2 yog normalizing 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.
Puas yog SA 387 Qib 12 Chav Kawm 2 weldable?
Yog lawm, nws yog weldable, tab sis cov txheej txheem vuam zoo yog qhov tseem ceeb vim nws cov Cr-Mo muaj pes tsawg leeg. Preheating (feem ntau yog 150-260℃/ 300-500℃F) yuav tsum tau tiv thaiv kom tsis txhob txias tawg, thiab kev kho cua sov tom qab vuam (PWHT) yog qhov tsim nyog los txo cov kev ntxhov siab thiab rov ua kom cov khoom tawv. Cov khoom siv vuam siv tau zoo suav nrog E7018-B2, E8018-B2, lossis ER80S-B2 rau GTAW / SMAW txheej txheem.
Tus qauv thickness ntau npaum li cas rau SA 387 Qib 12 Chav Kawm 2 daim hlau?
Cov phaj feem ntau muaj nyob rau hauv thicknesses ntawm 6 hli (0.25 nyob rau hauv) mus txog 200 hli (8 nyob rau hauv), nyob ntawm seb cov chaw tsim tshuaj paus. Rau cov phaj tuab, ntxiv cov kev tswj xyuas zoo (xws li kev tshuaj xyuas ultrasonic) yuav tsum tau ua kom muaj kev ncaj ncees sab hauv.