Detailed info about DN450 carbon steel pipe fittings 90 degree welding elbow Material: Carbon steel: ASTM/ASME A234 WPB,WPC Alloy steel: ASTM/ASME A234 WP 1-WP 12-WP 11-WP 22-WP 5-WP 91-WP 911 Stainless steel: ASTM/ASME A403 WP 304-304L-304H-304LN-304N ASTM/ASME A403 WP 316-316L-316H-316LN-316N-316Ti ASTM/ASME A403 WP 321-321H ASTM/ASME A403 WP 347-347H Low-temperature steel: ASTM/ASME A402 WPL 3-WPL 6 High