ASTM A333 GR3 cryogenic steel yeeb nkab yog seamless steel yeeb nkab rau cryogenic pipelines, feem ntau yog siv nyob rau hauv siab nkoj pipelines thiab tshav kub exchanger pipelines nyob rau hauv cryogenic ib puag ncig xws li -45℃mus rau -195 degree.
Cov muajspecificationsrau cov yeeb nkab steel no los ntawm sab nraud 8-1240mm thiab phab ntsa thickness 1-200mm. Los ntawm kev tswj cov tshuaj muaj pes tsawg leeg thiab cov khoom siv kho tshuab, nws ua tau raws li qhov yuav tsum tau muaj rau kev cuam tshuam cryogenic thiab tsim nyog rau kev tsim cov khoom siv cryogenic hauv thaj chaw xws li cov roj liquefied natural gas thiab tshuaj.
A333Gr3 yog qhov qis-kub toughness seamless steel yeeb nkab raws li tus qauv ASTM. Nws cov ntsiab lus tseem ceeb yog carbon manganese steel, thiab ntxiv cov npib tsib xee (kwv yees li 3.5%) txhim kho nws qhov qis - qhov kub thiab txias tsis kam. Nws cov txheej txheem tseem ceeb muaj xws li:
1. Tsawg- qhov ntsuas kub ntawm qhov ntsuas kub: Ntawm -101 degree, Charpy V-notch cuam tshuam lub zog yuav tsum siab dua lossis sib npaug li 20J (raws li ASTM A370) kom ntseeg tau tias cov khoom siv tsis tuaj yeem ua rau brittleness hauv qhov chaw txias heev.
2. Kev tswj cov tshuaj muaj pes tsawg leeg: Cov ntsiab lus carbon tsawg dua lossis sib npaug li 0.19%, thiab cov sulfur thiab phosphorus impurities tsawg heev (ob qho tib si Tsawg dua lossis sib npaug li 0.025%), txo qhov kev pheej hmoo ntawm kev mob khaub thuas brittleness.
3. Cov txheej txheem tsim khoom: Kev kho kom zoo yuav tsum tau ua kom zoo dua cov nplej thiab txhim kho kev sib luag.
Daim ntawv thov
Vim nws txoj kev ua haujlwm zoo heev, A333 Gr3 tau siv dav hauv peb qhov haujlwm tseem ceeb: lub zog, tshuaj, thiab lub zog.
Ua ntej, nyob rau hauv lub zog sector, nws yog siv nyob rau hauv liquefied natural gas (LNG) pipelines thiab cryogenic roj thiab roj extraction khoom.
Thib ob, nyob rau hauv kev lag luam tshuaj, nws yog qhov tsim nyog rau kev khaws cia thiab kev thauj mus los rau cov xov xwm cryogenic xws li ethylene thiab kua ammonia.
Thirdly, nyob rau hauv lub zog sector, nws yog siv nyob rau hauv auxiliary piping systems ntawm nuclear fais fab nroj tsuag los tiv thaiv lub cryogenic poob siab ntawm coolants.