ASTM A387 Qib 5 Qib 2
Lub siab zoo ASTM A387 Qeb 5 Chav Kawm 2 lossis chrome molybdenum alloy steel phaj npaj tshwj xeeb rau kev siv hauv weldable carbon steel siab hlab ntsha ntawm qhov kub siab. Ntxiv molybdenum muab cov khoom siv kub tensile zog thiab chromium muab kev txhim kho corrosion.
Qhov sib npaug ntawm ASTM A387 GRADE 5 Chav Kawm 2
| BS | EN | ASME | DIN |
| ... | ... | A387-5-2 | ... |
Specifications ASTM A387 Qib 5 Alloy Steel Phaj
Chromium & Molybdenum cov ntsiab lus (raws li ASME specification)
| Lub npe | Nominal Chromium Cov ntsiab lus (%) |
Nominal Molybdenum Cov ntsiab lus (%) |
| A387 Qib 5 | 5.00% | 0.50% |
Tensile Requirements rau ASTM A387 Qib 5 Alloy Steel Phaj Class 2 Phaj
| Lub npe: | Yuav tsum tau: | Qib 5 |
|
A387 Qib 5 |
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 ASTM A387 Qib 5 Alloy Steel Phaj
| Element | Chemical Composition (%) | |
| A387 Qib 5 | ||
| Cov pa roj carbon: | Kev Ntsuas Kub: | 0.15 max |
| Product Analysis: | 0.15 max | |
| 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: | 0.030 |
| Product Analysis: | 0.030 | |
| Silicon: | Kev Ntsuas Kub: | 0.50 max |
| Product Analysis: | 0.55 max | |
| Chromium: | Kev Ntsuas Kub: | 4.00 - 6.00 |
| Product Analysis: | 3.90 - 6.10 | |
| Molybdenum: | Kev Ntsuas Kub: | 0.45 - 0.65 |
| Product Analysis: | 0.40 - 0.70 |
1. Cov tshuaj muaj pes tsawg leeg ntawm A387 Qib 5 txawv ntawm Qib 11 lossis Qib 12 li cas?
A387 Qib 5 yog ntau dua -chromium alloy steel, feem ntau muaj nyob ib ncig ntawm 5% chromium thiab 0.5% molybdenum. Qhov no tso nws nyob nruab nrab ntawm Qib 11 ntau dua (~ 1.25% Cr) thiab Qib 22 (~ 2.25% Cr), muab nws qhov zoo sib xws ntawm oxidation tsis kam thiab nce siab -qhov kub thiab txias piv rau qis dua- qib alloy, thaum muaj peev xwm ua tau tus nqi ntau dua -{3} kev pab cuam ntau dua li steel.
2. Dab tsi yog qhov tseem ceeb ntawm kev kub siab - qhov zoo ntawm kev siv Qib 5 Chav Kawm 2?
Lub hom phiaj tseem ceeb ntawm A387 Qib 5 Chav Kawm 2 yog nyob rau hauv nws qhov kev tiv thaiv oxidation zoo dua thiab muaj zog tuav ntau dua ntawm qhov kub thiab txias feem ntau yog li ntawm 540℃mus rau 600℃(1000℃F txog 1112℃F), tshaj qhov muaj peev xwm ntawm Qib 11 lossis 12. Qhov no ua rau nws tsim nyog rau cov khoom siv hauv catalytic furnacetro lwm qhov kev pabcuam hnyav, kev hloov pauv ntawm cov khoom siv hluav taws xob, scaling thiab creep yog kev txhawj xeeb tseem ceeb.
3. Dab tsi yog qhov tseem ceeb welding thiab fabrication txiav txim siab rau A387 Gr.5 Cl.2?
Vuam A387 Qib 5 Chav Kawm 2 yuav tsum muaj cov txheej txheem nruj vim nws cov ntsiab lus alloy siab dua. Nws xav tau qhov yuav tsum tau ua kom sov (feem ntau yog 175-250℃/ 350-480℃F) thiab nruj tswj qhov kub thiab txias los tiv thaiv qhov nyuaj, tawg-sensitive microstructures. Tsis tas li ntawd, qhov yuav tsum tau ua tom qab Weld Heat Treatment (PWHT) nyob rau hauv thaj tsam ntawm 675-730℃(1250-1350℃F) yog qhov tseem ceeb kom npau taws rau thaj tsam weld, txo kev ntxhov siab, thiab rov ua kom corrosion.
4. Cov txheej txheem kev kho cua sov rau A387 Qib 5 Chav Kawm 2 yog dab tsi?
A387 Qib 5 Chav Kawm 2 daim hlau tau muab rau hauv cov xwm txheej zoo li qub thiab Tempered. Normalizing muaj cua sov saum toj no qhov kev hloov pauv thiab cua txias kom ua kom zoo dua cov qauv nplej, ua raws li tempering ntawm sub- kub tseem ceeb kom ua tiav qhov kev pom zoo ua ke ntawm lub zog thiab cov khoom siv tau teev tseg hauv tus qauv (feem ntau yog qhov tsawg kawg nkaus lub zog ntawm 310 MPa / 45 ksi).
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.
