Supply 12cr1mov loose flange production suppliers GB: GB/T9112-2000 (GB9113 · 1-2000 ~ GB9113 · 4-2000) Marine standard: GB/T10747-89 American Standard: ANSI B16.5 Class150, 300,600, 900,1500 (WN, SO, BL, TH, LJ, SW) Japanese standard: JIS 5K, 10K, 16K, 20K (PL, SO, BL, WN, TH, SW) German standard: DIN2573, 2572,2631,2576 , 2632,2633,2543,2634,2545 (PL, SO, WN, BL, TH) Ministry of Chemical Industry Standard: HG5010-52 ~ HG5028-58, HGJ44-91 ~ HGJ65-91, HG20592-09 Series, HG20615-09 Series Ministry of Machinery Standard: JB81-94 ~ JB86-94, JB/T79-94 ~ JB/T86-94, JB/T74-1994 Pressure Vessel Code: JB1157-82 ~ JB1160-82, JB4700-2000 ~ JB4707-2000 B16. 47A / B B16.39 B16.48 Tel: 15369761829 QQ: 2632931490