High Strength Steels

Mirraloy® TGP (4140/4150 Mod)

Turned Ground & Polished, Alloy Shaft

Mirraloy is a modified 4140/4150 steel, turned ground and polished shaft. Typical hardness is 269/341 BHN. 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 an excellent option 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 1018, 1045, 4140 and 4150 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.

Features

Heat Treated

Turned Ground & Polished

Machine Straightened

Stress Relieved

Clean Steel Technology

Electric Furnace Melt

Vacuum Degassed

Fine Grain Structure

Weldable

Typical Properties*

Hardness	269/341 BHN
Tensile	156,000 P.S.I.
Yield	123,500 P.S.I.
Elongation in 2%	17%
Reduction of Area	55%

*Based on 1/2″ test piece

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

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Available Lengths

10/12 Ft. R/L, 20/24 Ft. R/L and Custom Cuts

*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 Above	Call for Details

Up to 38MM Round	(+.000″/-.001″)
Over 38MM to 80MM Round	(+.000″/-.002″)
Over 80MM to 100MM Round	(+.000″/-.003″)
Over 100MM Round	Call for Details