Astm a269 tubing yog dab tsi?

Peb yog cov chaw tsim khoom ntawm stainless hlau astm a249 kauj tubing, tus qauv yog ASTM A 249 kauj tubing, lub raj yog Txheem yog ASTM A249. qhov chaw yog ci, qhov ntev yog 4000m / kauj, lub kauj raj yog mos, tuaj yeem siv rau roj teb, yeeb nkab haum, Khoom siv