... Standard: ASTM,DIN,BS,ANSI,JIS,EN DIN 2458 carbon steel welded pipe with good quality :High quality,low price,multi-standardCertificate:ISO9001 ... ,spiral pipe ,and so on.Deaign and manufacture std: DIN carbon steel flangesMaterial:Rst37.2,St37.2,C22.8)DIN2573 ... the answer as soon as possible.*******About our companyQingdao EVK Industrial Co.,Ltd is the professional manufacturer and exportor of flange ...