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)

Available Lengths

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

Available Sizes*

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

sPACKING

Typical Diameter Tolerances

Applications

Boxing is recommended to protect during shipment.