Tungsten Alloy

Overview 

Tungsten heavy alloys illustrate the advantages of microencapsulated powders. A brief background of this alloy system follows.
Tungsten heavy alloys generally are refractory metal, which have two-phase composites consisting of W-Ni- Fe or W-Ni- Cu or even W-Ni-Cu-Fe, some tungsten alloy is added Co、Mo、Cr, etc. They have very high melting point and have a density twice that of steel and are more than 50% heavier than lead. Tungsten content in conventional heavy alloys varies from 90 to 98 weight percent and is the reason for their high density (between 16.5 and 18.75 g/cc). Nickel, iron and copper serve as a binder matrix, which holds the brittle tungsten grains together and which makes the alloys ductile and easy to machine. Nickel-iron is the most popular additive, in a ratio of 7Ni:3Fe or 8Ni:2Fe (weight ratio). The conventional processing route for tungsten heavy alloys includes mixing the desired amount of elemental powders, followed by cold pressing and liquid phase sintering to almost full density. The matrix alloy melts and takes some tungsten into solution during liquid phase processing, resulting in a microstructure through which large tungsten grains (20–60µm) are dispersed in the matrix alloy. The as-sintered material often is subjected to thermo mechanical processing by swaging and aging, which results in increased strength and hardness in the heavy alloys.
 

Applications:

Apply for apparatus and instrument for medical, military and airspace industries. The majority of current uses for WHAs (tungsten heavy alloys) are best satisfied with the W-Ni-Fe system. Alloys such as 93W-4.9Ni-2.lFe and 95W-4Ni-lFe represent common compositions. The addition of cobalt to a W-Ni-Fe alloy is a common approach for slight enhancement of both strength and ductility. The presence of cobalt within the alloy provides solid-solution strengthening of the binder and slightly enhanced tungsten-matrix interfacial strength. Cobalt additions of 5 to 15% of the nominal binder weight fraction arc most common.

Specifications:

Grade	Size of Blanks (mm)	Density (g/cm3)	Hardness (HRC)	Tensile Strength (N/mm2)
W242(95W)	Ø11×162 Ø8.5×170	≥18.00	≥25	≥800
W152(93W)	/	≥17.30	≥25	≥500
W142(95W)		≥18.00	≥25	≥800
W221(97W)		≥18.40	≥28	≥920
GW90(90W)		≥17.00	≥20	/

 

Tungsten Alloy Rod

Grade	Physical and Mechanical Properties:
	Density (g/cm3)	Hardness (HRC)	Tensile Strength (MPa)	Elongation(%)	Toughness (MJ/m2)
W263H	17.25±0.15	≥35	≥1050	≥8	≥0.3
W253H	17.40±0.15	≥35	≥1050	≥8	≥0.3
W243H	17.60±0.15	≥35	≥1050	≥7	≥0.3
W232H	18.10±0.15	≥37	≥1050	≥6	≥0.1
W231H	18.30±0.15	≥37	≥1050	≥3	≥0.1
W221H	18.50±0.15	≥37	≥1050	≥2	≥0.07
W243H	17.60±0.15	≥40	≥1300	≥6	≥0.15
W232E	18.10±0.15	≥40	≥1300	≥6	≥0.15
W273	17.10±0.15	≥23	≥900	≥24	≥1.30
W263	17.25±0.15	≥23	≥900	≥23	≥1.20
W253	17.40±0.15	≥24	≥900	≥22	≥1.10
W243	17.60±0.15	≥24	≥920	≥20	≥0.90
W232	18.10±0.15	≥25	≥920	≥14	≥0.45
W231	18.30±0.15	≥26	≥920	≥12	≥0.30
W221	18.50±0.15	≥27	≥920	≥10	≥0.22
WNiCu	16.00-18.50	≥22	≥450	2-8	-

 

Tungsten Alloy Ring

Grade	Physical and Mechanical Properties
	Density (g/cm3)	Hardness (HRC)	Tensile Strength (MPa)	Elongation (%)	Toughness (MJ/m2)
W263H	17.25±0.15	≥35	≥1050	≥8	≥0.3
W253H	17.40±0.15	≥35	≥1050	≥8	≥0.3
W243H	17.60±0.15	≥35	≥1050	≥7	≥0.3
W232H	18.10±0.15	≥37	≥1050	≥6	≥0.1
W231H	18.30±0.15	≥37	≥1050	≥3	≥0.1
W221H	18.50±0.15	≥37	≥1050	≥2	≥0.07
W243H	17.60±0.15	≥40	≥1300	≥6	≥0.15
W232E	18.10±0.15	≥40	≥1300	≥6	≥0.15
W273	17.10±0.15	≥23	≥900	≥24	≥1.30
W263	17.25±0.15	≥23	≥900	≥23	≥1.20
W253	17.40±0.15	≥24	≥900	≥22	≥1.10
W243	17.60±0.15	≥24	≥920	≥20	≥0.90
W232	18.10±0.15	≥25	≥920	≥14	≥0.45
W231	18.30±0.15	≥26	≥920	≥12	≥0.30
W221	18.50±0.15	≥27	≥920	≥10	≥0.22
WNiCu	16.00-18.50	≥22	≥450	2-8	-

 

Tungsten Alloy Bar and Cube

Grade	RWM Group B	Nominal composition % Weight	Rockwell Hardness	Electrical Conductivity %ACS	Ultimate Tensile Strength PSI	Cross Breaking Strength PSI	Density GMS/CC	Thermal Exp in/in cx10(6) at 20°c	Thermal Conductivity W/CM °c 20-400°c
CW55	-	45 copper 55 tungsten	79B	55	63000	110000	12.6	11.8	2.4
CW68	-	32 copper 68 tungsten	88B	52	75000	130000	13.93	10.9	2.1
CW70	Class 10	30 copper 70 tungsten	90B	50	85000	140000	14.18	10.77	2.01
CW75	Class 11	25 copper 75 tungsten	94B	48	90000	150000	14.7	10.22	1.89
CW78	Class 11&12	22 copper 78 tungsten	96B	46	94000	160000	15.12	9.3	1.84
CW80	Class 12	20 copper 80 tungsten	98B	44	96000	170000	15.58	9.2	1.82
CW85	-	15 copper 85 tungsten	102B	36	75000	170000	16.19	7.97	1.75
CW90	-	10 copper 90 tungsten	106B	28	70000	150000	17.05	6.49	1.47
CW75	-	25 copper 75 tungsten	109B	28	16000	200000	14.6	-	-

 

Tungsten Alloy Ball

Grade	Physical and Mechanical Properties
	Density (g/cm3)	Hardness (HRC)	Tensile Strength (MPa)	Elongation (%)	Toughness (MJ/m3)
W273	17.10±0.15	≥23	≥900	≥24	≥1.30
W263	17.25±0.15	≥23	≥900	≥23	≥1.20
W253	17.40±0.15	≥24	≥900	≥22	≥1.10
W243	17.60±0.15	≥24	≥920	≥20	≥0.90
W232	18.10±0.15	≥25	≥920	≥14	≥0.45
W231	18.30±0.15	≥26	≥920	≥12	≥0.30
W221	18.50±0.15	≥27	≥920	≥10	≥0.22
WNiCu	16.00-18.50	≥22	≥450	2-8	-