stainless steel welded elbow  A403 WP 321-321H ASTM/ASME A403 WP347-347H 304 316
90° seamless steel elbow  A234 WPB
carbon steel pipe
GB/T14975-94  GB13296-91 304 304 LStainless steel pipe
oil casing pipe L80 oil casing pipe
welding 90° elbow
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