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Low Alloy Chromium-Manganese Steels

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Chromium and manganese are two of the most potent additions to steel for improving hardenability. These elements have traditionally been avoided in standard PM alloys due to the increased difficulty in reducing their oxides compared to molybdenum, nickel, and copper. The availability of dry hydrogen and nitrogen atmospheres and high temperature sintering, coupled with the need for reducing alloying costs, makes these newer chromium-manganese alloys ideal for many high-performance applications. The alloys provide a good balance of strength, toughness, ductility, and machinability.

The following tables contain a list of the materials available. For more complete coverage of properties, reference MPIF Standard 35, ASTM B783, ISO 5755, DIN 30910-4, and JIS Z2550, and download the technical information bulletins of interest. Standard powder metal materials are defined in North America by MPIF Standard 35 and ASTM B783, essentially equivalent standards. German PM steels are listed in DIN 30910-4, or more recently, ISO 5755. Japan steels are listed in JIS Z2550, with grade names changing with the revision from 1989 to 2000.

TYPE GRADES DESCRIPTION
Chromium-Manganese Steel MPIF/ASTM FL-5108, FL-5208, MPIF/ASTM FLC2-5208, FL-5305 ISO FL-07Cr2M, FL-05Cr3M Low alloy steel with prealloyed manganese, chromium, and molybdenum for improved strength and hardenability.

Chromium-Manganese Steel - As-Sintered

Chemistry Typical Properties
GRADE C Mn Cr Mo Ni Cu Density g/cm 3 Tensile Strength ksi (MPa) Yield Strength ksi (MPa) Elongation % Unnotched Impact Energy ft-lb (J) Apparent Hardness HRC
FL-5108

SSI-FeCr1-HTS		 0.70-0.85

0.70-0.85		 0.05-0.3

0.05-0.3		 1.7-1.9

1.7-1.9		 -

-		 -

-		 -

-		 6.7
6.9
6.9		 83 (570)
91 (630)
-		 65 (450)
73 (500)
-		 1
2
-		 6 (8)
9 (12)
-		 79
84
-
FL-5208

FL-07Cr2M

SSI-FeCr2-HTS
0.6-0.8


0.6-0.8
0.05-0.3


0.05-0.3
1.3-1.7


1.3-1.7
0.15-0.3


0.15-0.3		 -


-		 -


-		 6.7
6.9 6.8
7.0

6.9		 90 (620)
110 (760)
100 (690)
115 (795)
100 (690)		 70 (480)
80 (550)
75 (515)
83 (575)
80 (550)		 1
1
1.5

3		 9 (12)
12 (16)
10 (14)
13 (18)
-		 83
88
84
88
90
FL-5305

FL-05Cr3M

SSI-FeCr3-HTS
0.4-0.6


0.4-0.6
0.05-0.3


0.05-0.3
2.7-3.3


2.7-3.3
0.4-0.6


0.4-0.6
-


-
-


-		 6.7
6.9
6.8
7.2
6.9		 110 (760)
125 (860)
117 (810)
133 (915)
130 (900)		 85 (590)
100 (690)
93 (640)
107 (740)
120 (830)
<1


1		 8 (11)
10 (14)
(12)
(14)
-		 90
20 HRC
90
92
94

Chromium-Manganese Steel – Sinter-hardened

  Chemistry Typical Properties
GRADE C Mn Cr Mo Ni Cu Density
g/cm3 		Tensile Strength
ksi (MPa) 		Yield Strength
ksi (MPa) 		Elongation
% 		Unnotched Impact Energy
ft-lb (J) 		Apparent Hardness
HRC
FLC2-5208-HT 0.6-0.8 0.05-0.3 1.3-1.7 0.15-0.30 - 1-3 6.6
7.0 		95 (660)
120 (830) 		85 (590)
100 (690) 		<1 7 (9)
11 (15) 		23
30
FL-5305-HT 0.4-0.6 0.05-0.3 2.7-3.3 0.4-0.6 - - 6.6
7.0 		115 (790)
145 (1000) 		~UTS <1 7 (9)
10 (14) 		25
35