Diffusion Alloy Steel Improvement

Diffusion alloy steels (designated FD-02XX and FD04XX in MPIF Standard 35) have been manufactured by the diffusion of alloy elements (Ni, Mo) during the powder making process. These were offered by the Hoeganaes Corporation under the Distaloy brand.

Hoeganaes has recently developed an interesting variation of this product, called Ancorloy, which increases the physical properties at a lower (9%) material cost.

The difference is, briefly, that the alloy elements are blended into the base powder and the diffusion takes place during sintering in our furnace.

Please refer to the following table and note the improvement in Tensile Strength

ANCORLOY 2 AND ANCORLOY 4 POWDER METALLURGY MATERIALS.

Developed by the Hoeganaes Corporation these materials meet the chemical composition limits for MPIF Standard 35 Diffusion Alloyed Steel designated as FD-02XX and FD-04XX
( Distaloy 4600A and Distaloy 4800A).


Chemical Composition, %
Designation
Fe
C
Ni
Cu
Mo
FD-0208
BAL.
0.6-0.9
1.5-1.95
1.3-1.7
0.4-0.6
Ancorloy 2
BAL.
X*
1.75
1.5
0.55
FD-0408
BAL.

0.6-0.9
3.6-4.4
1.3-1.7
0.4-0.6
Ancorloy 4
BAL.
X*
4.0
1.5
0.55

*Equivalent tensile properties can be achieved with lower graphite addition for the Ancorloy Grades in comparison with Distaloy.


Tensile Strength, ksi
Density, g/cc
FD-0208
Ancorloy 2
FD-0408
Ancorloy 4
6.9
79
85(88*)
90
100(105*)
7.0
86
95(98*)
96.5
105(115*)
7.1
92

100(105*)
103
112(122*)
7.2
94
108(115*)
110
120(130*)
* Tempered in air at 400°F for one hour.
 
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