SA 387 Gr. 11 Cl . 1yog ib hom Chromium-Molybdenum (Cr-Mo) alloy steel phaj txhais los ntawm ASTM / ASME cov qauv, tsim los rau siab - qhov kub thiab txias kev pab cuam hauv welded siab hlab ntsha thiab boilers, muab zoo oxidation / corrosion kuj vim nws 1.25% Chromium cov ntsiab lus. Chav Kawm 1 qhia txog qib tensile lub zog tshwj xeeb, nrog rau Chav Kawm 2 muaj lub zog siab dua tab sis Chav Kawm 1 muaj qhov elongation zoo dua, thiab ob qho tib si sib xyaw cov tshuaj pleev ib ce tab sis txawv ntawm cov khoom siv kho mob thiab cov kev kho cua sov rau cov ntawv thov sib txawv.
Cov Khoom Siv Tshuaj Rau ASME SA387 Qib 11 Alloy Steel Phaj
| Element | Chemical Composition (%) | |
| SA387 Qib 11 | ||
| Cov pa roj carbon: | Kev Ntsuas Kub: | 0.05 - 0.17 |
| Product Analysis: | 0.04 - 0.17 | |
| Manganese: | Kev Ntsuas Kub: | 0.40 - 0.65 |
| Product Analysis: | 0.35 - 0.73 | |
| 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 - 0.80 |
| Product Analysis: | 0.44 - 0.86 | |
| Chromium: | Kev Ntsuas Kub: | 1.00 - 1.50 |
| Product Analysis: | 0.94 - 1.56 | |
| Molybdenum: | Kev Ntsuas Kub: | 0.45 - 0.65 |
| Product Analysis: |
0.45 - 0.70 |
Tensile Requirements
| ASME SA-387 Qib 11 Chav Kawm 1 |
|
|---|---|
| Tensile zog MPa [ksi] |
415-585 [60-85] |
| Yield zog MPa [ksi], min. |
240 [35] |
| Elongation hauv 8", min.% |
19 |
| Elongation hauv 2", min.% |
22 |
| Txo ntawm thaj, min. % |
- |
txheej txheem kev kho mob
1. Kev kho cua sov
Raws li ASME SA-387 cov qauv, cov phiaj yuav tsum tau ua ib qho kev kho cua sov hauv qab no kom ua tiav Chav Kawm 1 cov khoom siv tshuab:
Normalized & Tempered (N + T): Feem ntau cov mob rau ntsuas lub zog thiab toughness.
Annealed (A): Muab qhov siab tshaj plaws ductility thiab qis hardness.
Accelerated Cooling: Nrog tus neeg yuav khoom tso cai, daim hlau yuav ua kua quenched los yog cua- moj tej tawg txias, ua raws li tempering.
Tempering Kub: Qhov ntsuas kub tsawg kawg nkaus yuav tsum yog 1150℃F (620 degree).
2. Vuam txheej txheem
Preheating: Essential to prevent hydrogen-induced cracking. For SA 387 Gr.11, the minimum preheat temperature is typically 250°F (121°C), though it may be higher for thick sections (>1 nti).
Filler Metals: Siv cov khoom siv hluav taws xob sib piv rau cov khoom siv hlau, xws li E8018-B2 lossis cov pa roj carbon tsawg xws li E7018-B2L.
Interpass Kub: Yuav tsum tau khaws cia nyob rau hauv qhov kev teev tseg (feem ntau yog 121℃txog 300 degree) kom muaj kev ruaj khov microstructure.
3. Tshaj tawm -Weld Heat Treatment (PWHT)
PWHT yog ib qho tseem ceeb rau kev txo kev ntxhov siab thiab txhim kho cov ductility ntawm Heat Affected Zone (HAZ).
Tuav kub: Feem ntau ua ntawm 1200℃F (650 degree) thiab 1300℃F (705 degree).
Cov Cuab Yeej Cuab Yeej Cuab Yeej: Tshaj 800℃F (427 degree), qhov cua sov yog txwv rau 400℃F / hr (222℃/ hr) faib los ntawm phab ntsa tuab hauv ntiv tes.
Soak Sijhawm: Feem ntau 1 teev ib nti ntawm tuab, nrog tsawg kawg ntawm 15-30 feeb nyob ntawm cov cai tshwj xeeb (ASME Sec VIII Div 1 lossis 2).
4. Mechanical Properties (Class 1)
| Khoom | Tus nqi |
|---|---|
| Tensile zog | 60 - 85 ksi (415 - 585 MPa) |
| Yield zog | Ntau dua lossis sib npaug rau 35 ksi (240 MPa) |
| Elongation (hauv 2 ") | Ntau dua lossis sib npaug li 22% |
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.
Tau txais cov lus muaj nuj nqis rau SA 387 Qib 11 Chav Kawm 1, Hu rau GNEE Steel.
Yam khoom twg yog SA387 GR 11 CLASS 1?
Nws yog ASME -tus qauv Cr-Mo alloy steel phaj (1.25% Cr, 0.5% Mo) rau siab - cov khoom siv kub siab.
Cov khoom tseem ceeb ua li casnws muajtom qab kev kho cua sov?
Nws muaj qhov zoo heev - kub lub zog, toughness, creep kuj, zoo weldability thiab tsis tshua muaj kev ntxhov siab.
WhntawmKev kho cua sov feem ntau yog siv raunws?
Normalizing + Tempering lossis quenching + Tempering los ua kom zoo dua microstructure thiab ua kom zoo rau cov khoom siv kho tshuab.
Dab tsi yog qhov normalizing kub ntau rau nws?
Tshav kub rau 890-920℃(tshaj qhov kub siab), tuav, tom qab ntawd cua txias los ua kom cov nplej.
Tus txheej txheem twg tswj nws cov khoom tsim thiab tshuaj xyuas?
Nws ua raws li ASME SA-387, tus qauv rau cov phaj siab kub siab.
Dab tsi yog nws daim ntawv thov tseem ceeb?
Nws feem ntau yog siv los ua cov khoom siv rau siab - kub thiab siab - siab boilers thiab cov hlab ntsha.
Ua linwsmuaj zoo corrosion kuj?
Nws muaj nruab nrab corrosion kuj, tshwj xeeb tshaj yog tiv thaiv hydrogen nres rau petrochemical siv.
Dab tsi txias nruab nrab yog siv raunwsquenching?
Roj los yog dej yog siv los ua kom txias sai sai rau hauv martensite thiab txhim kho hardness.
Nws puas tuaj yeem ua cov khoom siv hluav taws xob sib txawv?
Yog lawm, nws yog qhov tsim nyog rau cov khoom siv hluav taws xob xws li cov phaj thiab cov raj, ua tsaug rau nws qhov kev ua tau zoo ntawm kev hloov pauv kub thiab thermal qaug zog tsis kam rau siab - qhov kev pabcuam kub.
Yuav tsum kuaj xyuas dab tsi tom qab kev kho cua sov?
Nws yuav tsum muaj kev ntsuam xyuas txhua yam (tensile, cuam tshuam), kev tshuaj xyuas microstructure thiab NDT zoo li kev kuaj ultrasonic thiab radiographic, tag nrho ua raws li ASME cov qauv.
Puas yog nws haum rau siab -kub piping flanges?
Yog lawm, nws tiv thaiv thermal cycling thiab mechanical stress, kom ntseeg tau tias xau- nruj kev sib txuas hauv siab - kub thiab siab - siab piping systems ntseeg tau.
Vuam ceev faj rau nws?
Preheat ua ntej welding, tswj interpass kub, txais yuav cov ntaub ntawv sib xws thiab ua PWHT kom tsis txhob tawg thiab tswj cov khoom siv kho tshuab.