High Strength Steels

Kromite® #3 HRHT (4140/4150 Mod)

High Strength, Prehard Alloy

Kromite #3 is a modified 4140/4150 steel. This chromium and molybdenum based alloy is electric furnace melt, vacuum degassed, stress relieved, and machine straightened. It is offered in the hot roll, heat treated condition. It has a typical hardness of 269/341 BHN and a typical tensile strength of 156,000 PSI. This proprietary product provides elevated strength, deep uniform hardness, excellent cleanliness, and refinement to the grain structure which enhances the fatigue resistance and overall performance of the steel.

Kromite #3 is an excellent alloy steel for machined parts requiring higher resistance to toughness, flex, torque and general wear.

Consideration should be given to use Kromite #3 in place of commercial alloy and carbon steel grades including: AISI 4140, 4150, 4340, 1018, 1020 and 1045 depending upon the requirement. Call or email us for a quote.

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Features

Clean Steel Technology

Electric Furnace Melt

Vacuum Degassed

Fine Grain Structure

Heat Treated

Machine Straightened

Stress Relieved

Free of Hard & Soft Spots

Typical Properties*

Hardness269/341 BHN
Tensile 156,000 P.S.I.
Yield 123,500 P.S.I.
Elongation in 2″ 17%
Reduction of Area55%

*Based on 1/2″ test piece

*Heavy Hollow Sections properties may differ

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Available Sizes

Rounds
1/2″
5/8″
3/4″
7/8″
1″
1-1/8″
1-1/4″
1-3/8″
1-1/2″
1-5/8″
1-3/4″
1-7/8″
2″
2-1/8″
2-1/4″
2-3/8″
2-1/2″
2-5/8″
2-3/4″
2-7/8″
3″
3-1/4″
3-1/2″
3-3/4″
4″
4-1/4″
4-1/2″
4-3/4″
5″
5-1/4″
5-1/2″
5-3/4″
6″
6-1/4″
6-1/2″
6-3/4″
7″
7-1/4″
7-1/2″
7-3/4″
8″
8-1/4″
8/1/2″
8-3/4″
9″
9-1/2″
9-3/4″
10″
10-1/2″
11″
11-1/4″
11-1/2″
12″
13″
13-1/2″
14″
15″
16″
Squares
1/2″
5/8″
3/4″
7/8″
1″
1-1/8″
1-1/4″
1-1/2″
1-3/4″
2”
2-1/2″
3”
3-1/2″
4”
6”
Flats
1-4″ x 1″
1/4″ x 1-1/2″
1/4″ x 2″
1/4″ x 3″
1/4″ x 4″
1/4″ x 5″
1/4″ x 6″
3/8″ x 1-1/2″
3/8″ x 2″
3/8″ x 2-1/2″
3/8″ x 3″
3/8″ x 4″
1/2″ x 1″
1/2″ x 1-1/2″
1/2″ x 2″
1/2″ x 2-1/2″
1/2″ x 3″
1-2″ x 3-1/2″
1/2″ x 4″
1/2″ x 5″
1/2″ x 6″
5/8″ x 2″
5/8″ x 3″
3/4″ x 1-1/2″
3/4″ x 2″
3/4″ x 2-1/2″
3/4″ x 3″
3/4″ x 4″
3/4″ x 5″
3/4″ x 6″
1″ x 1-1/4″
1″ x 1-1/2″
1″ x 2″
1″ x 2-1/2″
1″ x 3″
1″ x 4″
1″ x 5″
1″ x 6″
1-1/4″ x 2″
1-1/4″ x 2-1/2″
1-1/4″ x 3″
1-1/4″ x 3-1/2″
1-1/4″ x 4″
1-1/2″ x 2″
1-1/2″ x 2-1/2″
1-1/2″ x 3″
1-1/2″ x 4″
1-1/2″ x 5″
1-1/2″ x 6″
2″ x 2-1/2″
2″ x 3″
2″ x 3-1/2″
2″ x 4″
2″ x 5″
2″ x 6″
2-1/2″ x 3-1/2″
2-1/2″ x 4″
2-1/2″ x 6″
3″ x 4″
3″ x 5″
3″ x 6″
Hollow Stock
3″ O.D. x 1-1/2″ I.D.
3-1/2″ O.D. x 1-1/2″ I.D.
4″ O.D. x 2″ I.D.
4-1/2″ O.D. x 2-1/2″ I.D.
5″ O.D. x 3″ I.D.
6″ O.D. x 3-1/2″ I.D.

1Bar stock 10″ round and over is typically furnished rough turned and oversized to finish to the nominal size.

2Heavy Hollow is supplied as a rough size (O.D. and I.D.). It will not finish to its nominal size. Other sizes available.

Squares over 4-1/2″ and some flats may be furnished from plate. Standard plate cut tolerances apply.

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Lengths

10/13 Ft. R/L, 20/26 Ft. R/L and Custom Cuts

Applications

  • Arbors
  • Bearings
  • Couplings
  • Hex Nuts
  • Sleeves
  • Wheels
  • Bushings
  • Dies
  • Washers
  • Wear Rings
  • Collars
  • Flanges
  • Spacers
  • Bolts
  • Crank Shafts
  • Drive Shafts
  • Drag Line Parts
  • Feed Screws
  • Gears
  • Hubs
  • Journals
  • Line Shafts
  • Mandrels
  • Pinions
  • Stub Shafts
  • Tie Rods
  • Worm Gears

(Equivalent to Sheffield™ #10)

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