High Strength Steels

Mirraloy® FM TGP

1144 (modified) Free Machining, Turned Ground & Polished, Carbon Shaft

Mirraloy FM is a modified 1144 steel. Typical hardness is Rockwell “C” 26. Mirraloy FM is a high strength micro-alloyed, free machining carbon steel. Typical tensile strength 133,000 PSI. This steel shaft offers both a high degree of machinability, like a carbon steel, but has the strength consistent with an alloy steel. It does not exhibit hard and/or soft spots similar to what is seen in most carbon steels. It is designed for ease of machining with high speed automatic equipment, such as screw machinery.

Exhibits up to 50% more strength than that of a AISI 1018 carbon steel. Its high sulfur content makes this particular grade have a good machinability rating of 83% as compared to 1212 steel; welding though is not recommended. Good choice of steel for machined parts requiring better tensile strength and wear resistance than AISI 1045 or 1018. This is a “near” bearing-fit shaft with a precision finish of approximately RMS 15. Call or email us for a quote.

 

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.

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).

Precision Finish – “near” bearing-fit shaft with a precision finish of approximately RMS 15.

Strength Comparison Chart (Based on 1/2″ Dia. Specimen)

Mirraloy FMC1045C1018
Tensile Strength133,000 PSI91,000 PSI70,000 PSI
Yield Strength110,000 PSI77,000 PSI50,000 PSI

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

Hardness, Brinell (Rockwell)260 BHN (Rc “26”)
Tensile Strength (Typ.)133,000 P.S.I.
Yield Strength (Typ.)110,000 P.S.I.
Elongation in 2″8% min.
Reduction of Area25%
Machinability Rating83% of carbon steel

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″
2-1/16″
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″
2-13/16″
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″

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

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”)

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 FM TGP is the past protected tradename of North American Steel Company.

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