| Niobium machined parts Raytec metal Provides machined pure niobium, niobium zirconium alloy parts according to customer drawing and request. Niobium crucible, Niobium flange, Niobium container, Niobium grounding ring, Niobium nut, Niobium tips, Niobium Bolt, Niobium screw, other machined Niobium parts. All the normal machining techniques can be used for niobium. The metal has a strong tendency to gall, however, and special attention must be paid to tool design and lubricant use. In lathe turning, the metal behaves very much like soft copper. The use of high-speed tooling with adequate lubrication and cooling with soluble oil (or other suitable product) following the parameters given here is recommended. Although carbide tools can be used, the tendency to gall is more pronounced with them than with high-speed steel. In turning, the metal should be removed in a shearing action and the chip allowed to slide off the tool surface. When build-up of the chip occurs, the resulting pressure breaks the cutting edge of the tool. The machining recommendations shown in the accompanying table generally give satisfactory results. The minimum surface speed of 80 feet per minute is important. Slower speeds will cause the metal to tear, particularly annealed stock. Normally, unannealed metal is preferred for lathe operations. Tooling Recommendations for Machining Niobium Approach angles: 15掳 - 20掳 Side Rake: 30掳 - 35掳 Side and End Clearances: 5掳 Plan Relief Angle:15掳 - 20掳 Nose Radius: .020" - .030" Cutting Speed: 60 - 80 feet/ minute with high speed steel. 250 - 300 feet/ minute with carbide tools. Feed, Roughing: .008" - .012"/ revolution Feed, Finishing: .005" maximum / revolution Depth of cut: .030" - .125" PHYSICAL PROPERTIES PHASE 鈥?Solid STD ATOMIC WEIGHT 鈥?Solid STD ATOMIC WEIGHT 鈥?92.90638(2) g-mol-1 MELTING TEMPERATURE 鈥?2750 K, 2477掳 C, 4491掳 F BOILING POINT 鈥?5017 K, 4744掳 C, 8571掳 F CRYSTAL STRUCTURE 鈥?Body Centered Cubic ELECTRICAL RESISTIVITY 鈥?(0 掳C) 152 n惟路m THERMAL CONDUCTIVITY 鈥?(300 K) 53.7 W路m鈭?路K鈭? THERMAL EXPANSION 鈥?7.3 碌m/(m路K) GENERAL PROPERTIES SYMBOL 鈥?Nb NUMBER 鈥?41 ELEMENT CATEGORY: 鈥?Transition Metals AVAILABLE PURITIES: 路 Commercial Grade ( ASTM ) 路 3N 99.9%COMMON SPECIFICATIONS 路 ASTM R04210 o禄 Commercial Grade (Unalloyed) 路 ASTM R04200 o禄 Reactor Grade (Unalloyed) 路 ASTM R04261 o禄Commercial Grade Niobium 1% Zirconium Alloy 路 ASTM R04220 o禄RRR Grade Pure Niobium AVAILABLE ALLOYS: 路 Niobium 路 Niobium 1% ZirconiumNiobium Products suppliers website:http://www.raytec-metal.com/niobium-products/ |