High Strength Steels

Mirraloy® TGP

4140/4150 (modified) Turned Ground & Polished, High Strength Alloy Shaft

Mirraloy is a modified 4140/4150 steel, turned ground and polished shaft. Typical hardness is Rockwell “C” 28/34. This chromium and molybdenum based alloy is electric furnace melt, vacuum degassed, stress relieved, and machine straightened. It is offered in the turned ground and polished condition; with a “near” bearing-fit precision tolerance. Surface finish is approximately RMS 12/15. Typical tensile strength is 156,000 PSI. Call or email us for a quote.

Mirraloy is a good choice of alloy steel for machined parts, steel shafts, and steel rods requiring higher resistance to toughness, flex, torque and general wear.

Consideration should be given to use Mirraloy in place of certain commercial alloy and carbon steel grades including: AISI 4130, 4140, 4150, 4340, 1018, 1020 and 1045 depending upon the requirement.

In addition to meeting the requirements set forth by AISI and SAE standards, Associated Steel offers some of the tightest chemical and mechanical restrictions when producing its shafting material.

 

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

Typical Mechanical Properties (Based on 1/2″ Dia. Specimen)

Hardness, Brinell (Rockwell)269/341 BHN (Rc “28/34”)
Tensile Strength156,000 P.S.I.
Yield Strength123,500 P.S.I.
Grain Size95% – 8
Elongation in 2%17%
Reduction of Area55%
Machinability Rating50%

Available Lengths

10/12 Foot Random Lengths, 20/24 Foot Random Lengths, Custom Cut-To-Lengths

Available Sizes*

Rounds

1/4″

5/16″

3/8″

7/16″

1/2″

9/16″

5/8″

11/16″

3/4″

13/16″

7/8″

15/16″

1″

1-1/16″

1-1/8″

1-3/16″

1-1/4″

1-5/16″

1-3/8″

1-7/16″

1-1/2″

1-9/16″

1-5/8″

1-11/16″

1-3/4″

1-13/16″

1-7/8″

1-15/16″

2″

2-1/16″

2-1/4″

2-5/16″

2-3/8″

2-7/16″

2-1/2″

2-9/16″

2-5/8″

2-11/16″

2-3/4″

2-7/8″

2-15/16″

3″

3-1/16″

3-1/4″

3-5/16″

3-3/8″

3-7/16″

3-1/2″

3-9/16″

3-5/8″

3-11/16″

3-3/4″

3-7/8″

3-15/16″

4″

4-1/4″

4-3/8″

4-7/16″

4-1/2″

4-3/4″

4-15/16″

5″

5-1/4″

5-7/16″

5-1/2″

5-15/16″

6″

6-1/2″

7″

8″

Metric Rounds
4mm

5mm

6mm

7mm

8mm

9mm

10mm

11mm

12mm

13mm

14mm

15mm

16mm

17mm

18mm

19mm

20mm

21mm

22mm

23mm

24mm

25mm

26mm

27mm

28mm

30mm

32mm

35mm

36mm

38mm

40mm

45mm

50mm

55mm

60mm

65mm

70mm

80mm

90mm

100mm

*Small diameter shafts may have modified analysis and/or variations in thermal treatment.

sPACKING

Typical Diameter Tolerances

1/4″ to 1-1/2″ Round(+.000″/-.001″)
Over 1-1/2″ to 3″ Round(+.000″/-.002″)
Over 3″ to 4″ Round(+.000″/-.003″)
Over 4″ to 7″ Round(+.000″/-.004″)
Over 7″ Round and AboveCall for Details
Up to 38MM Round(+.000″/-.001″)
Over 38MM to 80MM Round(+.000″/-.002″)
Over 80MM to 100MM Round(+.000″/-.003″)
Over 100MM RoundCall for Details

Applications

  • Arbors
  • Bolts
  • Crank Shafts
  • Drive Shafts
  • Drag Line Parts
  • Feed Screws
  • Gears
  • Hoist Shafts
  • Hubs
  • Journals
  • King Bolts
  • Lead Screws
  • Line Shafts
  • Mandrels
  • Pinions
  • Rings
  • Stub Shafts
  • Tie Rods
  • Worm Gears
  • Wrist Pins

Boxing is recommended to protect during shipment.

Sheffield #20 is the past protected tradename of North American Steel Company.

Centrex P&G is the past protected tradename of Ludlow Steel Company.

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