ANSI B16.5 Carbon Steel Flenzen fabrikant, ASTM A05, ASTM A350, ASTM A694 F52, F56, F60, F65, F70, WN flenzen, LWN flenzen, SW flenzen, threaded flenzen, bline flenzen, dus flenzen, plaat joint flanges, jlet tf face
- Zhengzhou Huitong Pipeline Equipment Co., Ltd.