1.ASTM A106B/ A53 B DIN
2. ASME/ANSI B16.9 ASME/ANSI B16.11 JIS B2311 JIS B2312 JIS B2313 JIS B2316
3. OD 21.34~1219.2  WH 5S ,10S STD/40 40S 80S XS/80 XXS 120 160 20 60 100 140
4. can producer according to buyers'requirtment
5 .high quanlity
6. high resistment