ANSI B16.5 Carbon Steel Flanges Fabrikant, ASTM A05, ASTM A350, ASTM A694 F52, F56, F60, F65, F70, WN flanger, LWN flanger, SW flanger, threaded flanger, blind flanger, so flanger, lap joint flanges, j tf face
- Zhengzhou Huitong Pipeline Equipment Co., Ltd.