ISO 9001 API CERTIFICATE COMPETITIVE PRICE EXCELLENT QUALIT 1. outside diameter: 75mm-2265mm2. thickness: 12mm-120mm3. standards: ANSI, DIN, JIS, BS, ISO, GB/T, JB, SH, HGS and so on.4. use: petroleum, chemical industry, medicine, electric power, astronautics, war industry, fire prevention, metallurgy, shipbuilding, fuel gas, nuclear electricity, urban construction, hot-water heat and ...