A420 qis-kub steel ntoo khaub lig teeyog cov yeeb nkab haum feem ntau siv rauredirect dej ntws, tso cai rau cov kua xa tawm ntawm ib qho mus rau lwm qhov. Raws li qhov tseem ceeb ntawm cov kav dej txuas txuas, nws ntaplaub qhov chaw nres nkoj, los ntawm cov kua dej tuaj yeem nkag los yog tawm hauv cov kav dej.
Txheem Specification
ASTM A420, tsim los ntawm American Society for Testing and Materials (ASTM), yog ib qho kev qhia tshwj xeeb rau pob tw -welded wrought carbon steel thiab alloy steel yeeb nkab fittings rau qis- kev pabcuam kub. Lub hom phiaj tseem ceeb ntawm tus qauv no yog los xyuas kom meej tias cov fittings muaj txaus toughness, lub zog, thiab sealing cov khoom nyob rau hauv cryogenic ib puag ncig, tiv thaiv cov khoom embrittlement los yog structural tsis ua hauj lwm los ntawm tam sim ntawd kub poob. Nws qhia meej cov kev cai tseem ceeb, suav nrog cov tshuaj lom neeg muaj pes tsawg leeg, cov cuab yeej cuab yeej cuab tam, cov txheej txheem tsim khoom, kev ua siab ntev ntev, cov txheej txheem kuaj tsis muaj kev puas tsuaj, thiab daim ntawv lo thiab ntim cov cai rau fittings. Nws qhov ntsuas kub tau nce mus txog -45 degree, npog feem ntau cov kev pabcuam cryogenic. Nws tseem muab cov ncauj lus qhia ntxaws ntxaws rau kev tsim cov kev kub ntxhov thiab kev sib txuas, muab kev qhia dav dav rau cov tuam ntxhab thiab cov neeg siv khoom.
Cov ntaub ntawv qib ASTM A420
ASTM A420 tus qauv npog ntau yam carbon steel thiab alloy steel qib tsim nyog rau qis- qhov kub thiab txias. Cov qib no tau muab faib ua WPL3, WPL6, WPL9, WPL11, WPL12, WPL22, thiab lwm yam raws li lawv cov tshuaj muaj pes tsawg leeg thiab cov khoom siv kho tshuab. Ntawm lawv, WPL6 yog ib qho ntawm cov khoom siv dav tshaj plaws.
Tshuaj muaj pes tsawg leeg ntawm WPL6 Cross
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Cr | Mo | Ni | Cu | Cb | V |
| ASTM A420 WPL6 | MIN | 0.50 | 0.15 | |||||||||
| MAX | 0.30 | 1.35 | 0.035 | 0.040 | 0.40 | 0.40 | 0.30 | 0.12 | 0.40 | 0.02 | 0.08 |
Mechanical zog ntawm WPL6 Cross
|
KHOOM |
ASTM A420 WPL6 |
|
TS (MPA) |
415-655 |
|
YS (MPA) |
240 feeb |
|
Cov ntsiab lus elongation |
ASTM A420 WPL6 |
|
|
Longi -tudinal |
Trans- nqe |
|
|
Standard round specimen, los yog me me proportionaspecimen, min %e hauv 4 D |
22 feeb |
12 feeb |
|
Rectangular specimen for wall thickness e in . 0.94mm and over, and for all me me tested in fusection: min % o hauv 2 in. lossis 50 mm |
30 feeb |
16.5 min |
Kev cuam tshuam kev ua haujlwm ntawm WPL6 Hla
|
Charpy lmpact Requirements rau WPL6, WPL9, thiab WPL3 |
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|
Qhov loj ntawm Specimen |
Charpy V-Notch ImpactValue Yuav Tsum Tau Txais (Nruab nrab ntawm Peb Cov Qauv) |
Yam tsawg kawg nkaus Charpy V-NotchImpact Tus nqi yam tsis xav rov kuaj dua (Ib qho piv txwv nkaus xwb ntawm ib txheej) |
||
|
ft.lbf ib |
J |
ft.lbf ib |
J |
|
|
10*10 |
13 |
18 |
10 |
14 |
|
10*7.5 |
10 |
14 |
8 |
11 |
|
10*5.0 |
7 |
9 |
5 |
7 |
|
10*2.5 |
4 |
5 |
3 |
4 |
GNEE ASTM A420 WPL3WPL6 Crossmuag
