... phase steel Standard: JIS,ANSI,UNI,DIN,NF,ASME,API,JPI,AWWA 1Type: welding neck flange,slip on flange,lap joint ... dual phase steel3Standard: JIS,ANSI,UNI,DIN,NF,ASME,API,JPI,AWWA,BS4size:OD up to 5,000mm5markingrequire6production with anneal solution ...