ST12 yog qhov zoo tib yam txias dov hlau, ST12 belongs rau tus qauv German (DIN1623), sib npaug rau EN10130 DC01, JS SPCC, Asmeskas tus qauv ASTM A1008 CSST12 yog cov khoom txias txias txias, ST13 stamping qib txias dov hlau yog ST14 sib sib zog nqus, daim duab qib txias dov hlau, ST12 yog qhia raws li tus lej hlau zoo tib yam, thiab q195, spcc, DC01 qib cov khoom yog qhov zoo ib yam.