ANSI B16.5 çêkerê flanges pola karbon, ASTM A05, ASTM A350, ASTM A694 F52, F56, F60, F65, F70, flanges WN, flanges LWN, flanges SW, flanges threaded, flanges kor, planges, flanges hevgirtî, flanges. rtj, tf rû
- Zhengzhou Huitong Pipeline Equipment Co., Ltd.