KROMITE #3
Hot Rolled, Heat Treated, High Strength Alloy
Typical Mechanical Properties*
Brinell Hardness ...269/341 BHN
Tensile Strength .. 156,000 P.S.I.
Yield Strength ..123,500 P.S.I.
Grain Size ..95% - 8
Elongation ...17%
Reduction of Area ...50%
Kromite #3
*Based on Diameter Test Specimen
Key Features
Clean Steel Technology a manufacturing process that
delivers consistent steel through control and refinement
of the melt.
Proprietary Chemistry a chemistry that offers
excellent cleanliness and a well defined grain structure to
provide fatigue resistance when material is in service.
Electric Furnace Melt offers greater quality control
at the mill including refinement of chemistry, grain size
and shape.
Vacuum Degassed eliminates many impurities found
in standard commercial grade alloys. The result is a
better, cleaner, and stronger product that extends service.
Heat Treated eliminates excessive cost in heat
treatment. Our material is thermally treated (as delivered)
to a hardness of 269/341 BHN.
Machine Straightened eliminates excessive bow and
distortion. Our standard straightness is 1/8 in any 5 feet,
better than twice the industry standard. (for rounds and
squares only)
Stress Relieved reduces the likelihood of material
walking or moving during machining.
Semi-Finished and Finished Products
Available Lengths
Kromite #3 Econo-Finish furnished ground top and bottom to
(+.015/+.030) oversize; sides saw cut to (+1/8). Available
up to 12 Ft lengths; see page 53 for further details.
10/12 Foot Random Lengths
20/24 Foot Random Lengths
Custom Cut-To-Lengths
Long Lengths
Kromite #3 Flat Ground furnished precision ground to
(+.001/-.000) on thickness and (+.005/-.000) on all sides with
lengths (+1/4) at 18 and 36 available; see page 61 for details.
If currently using 1018, 1045, 4130,
4140, 4150, 4145, or 4340, consider
Kromite #3 as an upgrade to those
commercial grade steels.
Phone: 800.321.9300
Fax: 800.441.9303
E -mail: mail@associatedsteel.com
KROMITE #3
Hot Rolled, Heat Treated, High Strength Alloy
Available Sizes*
Machining Data
Rounds
Note: Caution should be exercised when cold
working any hardened alloy material. Use
equipment of sufficient capacity that is in good
condition. Utilize machine operators that are
experienced in working with hardened alloys
and wear appropriate safety gear.
1/2
1-1/2 2-1/2
5/8
1-5/8 2-5/8 4-1/4 6-1/4 8-1/4
3/4
1-3/4 2-3/4 4-1/2 6-1/2 8-1/2 11-1/4
7/8
1-7/8 2-7/8 4-3/4 6-3/4 8-3/4 11-1/2
1-1/8 2-1/8 3-1/4 5-1/4 7-1/4 9-1/2
10-1/2
15
11
16
12
13
1-1/4 2-1/4 3-1/2 5-1/2 7-1/2 9-3/4 13-1/2
1-3/8 2-3/8 3-3/4 5-3/4 7-3/4
Squares
1/2
7/8
5/8
3/4
1-1/4
1-1/2 2-1/2
1-1/8 1-3/4
3-1/2
4
6
10
14
Hot Roll Annealed
Bar Stock, Brake
Die Stock and
Custom Forgings
are all available
upon request.
Flats
1/4 x 1
1/2 x 3
1 x 2
1-1/2 x 6
1/4 x 1-1/2 1/2 x 3-1/2 1 x 2-1/2
2 x 2-1/2
1/4 x 2
1/2 x 4
1 x 3
2 x 3
1/4 x 3
1/2 x 5
1 x 4
2 x 3-1/2
1/4 x 4
1/2 x 6
1 x 5
2 x 4
1/4 x 5
5/8 x 2
1 x 6
2 x 5
1/4 x 6
5/8 x 3
1-1/4 x 2
2 x 6
3/8 x 1-1/2 3/4 x 1-1/2 1-1/4 x 2-1/2 2-1/2 x 3-1/2
3/8 x 2
3/4 x 2
1-1/4 x 3
2-1/2 x 4
3/8 x 2-1/2 3/4 x 2-1/2 1-1/4 x 3-1/2 2-1/2 x 6
3/8 x 3
3/4 x 3
1-1/4 x 4
3 x 4
3/8 x 4
3/4 x 4
1-1/2 x 2
3 x 5
1/2 x 1
3/4 x 5
1-1/2 x 2-1/2 3 x 6
1/2 x 1-1/2 3/4 x 6
1-1/2 x 3
1/2 x 2
1 x 1-1/4
1-1/2 x 4
1/2 x 2-1/2 1 x 1-1/2
1-1/2 x 5
Phone: 800.321.9300
Fax: 800.441.9303
Kromite #3 and Mirraloy TGP ar e heat
treated alloy materials both with an approximate
hardness of Rc 30. Machinability rating is
approx. 60%, depending on actual hardness.
High Speed
Depth of Cut .150
Speed
70fpm
Feed
.015 inch/revolution
Tooling
C6
Carbide
Depth of Cut .150
Speed
260 brazed, 330 throw-away
Feed
.015 inch/revolution
Tooling
C6
(Cutting Fluid: Soluble Oil 1:20)
Drilling
Point Angle
118, relief 12
Helix Angle
29 point: plan
Feed
.005 inch/revolution
*Typically, 10 Rounds and above are furnished
as Rough Turned Oversized, to finish to the
nominal size, & have an approximate 500 RMS.
All squares over 4-1/2 are produced from
plate; standard plate tolerances apply. Certain
flats may be furnished from cut plate; standard
plate tolerances apply.
Typical Applications
Arbors
Bolts
Line Shafts
Drive Shafts
Drag Line Parts
Feed Screws
Gears
Journals
Lead Screws
Mandrels
Mine Car Axles
Pins
Piston Rods
Rings
E -mail: mail@associatedsteel.com
Studs
Tool Shanks
Tie Rods
Textile Parts
Wear Strips
Worm Gears
Wrist Pins
