ASTM A860 WPHY 52 Fittings yog tsim los ntawm high yield carbon steel nrog carbon, manganese, sulfur, phosphorus, silicon, npib tsib xee, chromium, molybdenum, tooj liab, titanium, vanadium thiab cobalt nyob rau hauv cov muaj pes tsawg leeg.Qhov muaj zog durability ua kom lub neej ua haujlwm ntev, yog li ntawd PH yog ib qho pov thawj tias lub neej ua haujlwm ntev 85 60 PH yog ib qho pov thawj. daws.