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ASTM A403 WP304 316L B16.9 Stainless Steel Butt Weld 90 Degree Elbow 1. Material: ASME B 16.9 304 304l 316L 321 310s 2. Technics: Casting 3. Type: Elbow 4. Place of Origin: Zhejiang China (Mainland) 5...