ISO 8434-1 Cov pa roj carbon steel tub raj yuav tsum ua raws li qhov khoom xa tawm R37 NBK, raws li teev hauv ISO 3304 (txias-kos thiab li qub) lossis ISO 3305 (txias-kos thiab li qub). Stainless hlau tub yuav tsum ua raws li ISO 1127 (annealed).
ISO 8434-1 hlab Kev Xav Tau
Jun 15, 2019
Xa kev nug