Lanthanum, neodymium, gadolinium, dysprosium, yttrium, and their oxides. Method of determination of impurities as oxides of praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium
Petroleum and natural gas industries. Subsea production systems. Forged or rolled pipe flanges alloy and stainless steel forged fittings and valves and parts for operation at high temperatures. Standard specification
