NSRW Group B - Refactory Metal Compositions

Group B - Refractory Metal Compositions

RWMA Classification	Type of Material	RWMA Group B Material	Hardness Rockwell	Electrical Conductivity %I.A.C.S.	Ultimate Tensile Strength, psi	Cross Breaking Strength, psi
Class 10	Tungsten-Copper	10.74450	77 B	53	63,000	110,000
Class 10	Tungsten-Copper	-	90 B	50	75,000	130,000
Class 10	Tungsten-Copper	-	95 B	48	85,000	140,000
Class 11	Tungsten-Copper	11.74400	98 B	45	90,000	150,000
Class 12	Tungsten-Copper	12.74350	103 B	41	98,000	170,000
Class 12	Tungsten-Copper Alloy	-	105 B	30	120,000	180,000
Class 12	Tungsten-Copper Alloy	-	109 B	28	160,000	200,000
Class 12	Tungsten Carbide-Copper	-	94 B	45	70,000	140,000
Class 12	Tungsten Carbide-Copper	-	100 B	42	75,000	160,000
Class 12	Tungsten Carbide-Copper	-	37 C	30	85,000	180,000
Class 12	Tungsten Carbide-Copper Alloy	-	47 C	18	150,000	220,000
Class 13	Tungsten	13.74300	39 C	30	150,000	200,000
Class 14	Molybdenum	14.42300	90 B	30	80,000	120,000
Class 14	Tungsten-Nickel-Iron-Molybdenum	-	30 C	11	133,000	240,000
Class 14	Tungsten-Nickel-Iron-Molybdenum	-	34 c	13	140,000	280,000

Class 10 (Copper Tungsten)

Class 10 material is recommended as facings or inserts for projection welding electrodes and flash and butt welding dies where high electrical conductivity is desirable and a degree of malleability is necessary.

Class 11 (Copper Tungsten)

Class 11 (a harder material than Class 10) is recommend as facings and inserts for flash and butt welding dies and a general purpose projection welding electrodes. It may also be used as seam welder bearings inserts and facings for Electro-forming or Electro-forging, such as stainless steal.

Class 12 (Copper Tungsten)

Class 12 material is specifically recommended for heavy duty projection welding electrodes and for die facings in Electro-forming and Electro-forging applications. It is suitable as die material for electrical upsetting of rivets and studs.

Class 13 (Tungsten)

Class 14 (Molybdenum)

Class13 and Class 14 materials are recommended principally for welding or Electro-brazing non-ferrous metals having relatively high electrical conductivity.

Cross wire welding of copper and brass wires and welding of copper wire braid to brass and bronze terminals are typical applications. Generally, special set-ups and procedures are required for this type of work.