Cov pa roj carbon seamless steel yeeb nkab rau qhov kub thiab txias, qhia tau hais tias cov alloy muaj pes tsawg leeg thiab cov ntsiab lus (feem pua ntawm qhov hnyav) ntawm cov yeeb nkab steel yog:
C Tsawg dua lossis sib npaug rau {{0}}.13, Si Less dua lossis sib npaug rau 0.30, Mn:0.40-1.20, P Tsawg dua lossis sib npaug li 0.02,
S Less tshaj lossis sib npaug rau {{0}}.02, Cr Less dua lossis sib npaug rau 0.20, Mo Less dua lossis sib npaug rau 0.10, V Less dua lossis sib npaug rau 0.10,
Ni Less tshaj los yog sib npaug rau {{0}}.20, Cu Less tshaj los yog sib npaug rau 0. 20, Al: 0.01-0.008, thiab qhov nyiaj tshuav yog hlau Fe.
Cov khoom saum toj no yog cov pa roj carbon seamless steel kav uas tau txais tom qab cov ntaub ntawv raw tau ua tiav rau hauv cov raj xa dej, thermal ua, kev ua txias thiab cov khoom tiav.
ASTM A333 Cov khoom lag luamyog tus qauv specification rau seamless thiab welded carbon thiab alloy steel yeeb nkab rau cryogenic kev pab cuam los yog lwm yam kev siv uas yuav tsum tau notch toughness. Tus qauv npog ntau qib ferritic steel: Qib 3, 4, 6, 7, 8, 9, 10 thiab 11.
Lub quenching kub ntawm qis-kub carbon steel kav yog A3+(30 ~ 50) degree . Hauv kev xyaum, qhov kev txwv sab saud yog feem ntau coj. Kub quenching kub tuaj yeem ua kom cov cua kub ceev ntawm cov pa roj carbon steel qis, txo qhov oxidation ntawm qhov chaw, thiab txhim kho kev ua haujlwm. Yuav kom homogenize lub austenite ntawm lub workpiece, txaus tuav lub sij hawm yuav tsum tau.
Yog tias qhov tseeb qhov cub tawg loj, lub sijhawm tuav yuav tsum tau txuas ntxiv kom tsim nyog. Txwv tsis pub, hardness tsis txaus yuav tshwm sim los ntawm cov cua sov tsis sib xws. Txawm li cas los xij, yog tias lub sijhawm tuav ntev dhau lawm, cov nplej yuav ntxhib thiab oxidation thiab decarburization yuav loj heev, uas yuav cuam tshuam qhov zoo ntawm quenching.
Qib 6 Pipe Chemical Requirements:
| Element | Kev sib xyaw (%) |
|---|---|
| Cov pa roj carbon (max) | 0.30 |
| Manganese | 0.29-1.06 |
| Phosphorus (max) | 0.025 |
| Sulfur (max) | 0.025 |
A333 Qib 6 Pipe Mechanical Requirements:
| Psi | MPa | |
|---|---|---|
| Tensile zog (min) | 60,000 | 415 |
| Yield zog (min) | 35,000 | 240 |
