... : ANSI, DIN, JIS, BS, ISO, GB/T, JB, SH, HGS and so on.4. use: petroleum, chemical industry, medicine, electric power ... electricity, urban construction, hot-water heat and environmental protection etc.5. certificate: ISO9001:2000 , ASME and Boiler A-level6. material: ASTM A ... ,WP5,WP9,WP11,WP22,304,316,314L,316L stainless steel high pressure pipe flange