Technical Data

Mir50® vs 304 and 316 Comparison Chart


Ease of Machining – Engineered for ease of machining. Less induced stress and movement. Not gummy and will hold a close tolerance. Does have a bright finish.

Corrosion Resistant – Superior service life in corrosive applications. Offers similar corrosion resistance like SAE 316.

High Strength – At approximately 30Rc, Mir50 has a typical tensile strength of 140,000 PSI; consistent from smallest diameter through large round sizes.

Non-Galling – Excellent resistance to the effects of galling. Can be used in conjunction with SAE 300 series, 400 series and PH series stainless. Additionally, will mate and come apart during changeovers with carbon and alloy steels as well.

Low Retained Stress – Double stress relief at the mill. There is a second tempering cycle added at the end of the production. Ease of machining means less stress is released during processing operations. Less Stress = Less Memory = No Movement.

Pump Shaft Straightness – TGP ONLY. Delivered to special straightness (.005” in first 5 feet, plus .0015” for each additional foot of shaft). Less wear on bearings, seals and bushings. Shipped Boxed and Cradled.

More Options – Available in two surface finishes; Turned Ground and Polished (TGP) and Rough Turned Oversize (RTOS). Tight tolerances on TGP is “near” bearing-fit with little machining needed. Also available in Heavy Hollow Stock.

Long Lengths Available – Stocked in lengths many times up to 29 feet. Sold as cut lengths and/or random lengths. Can customize to your exact needs.


Hard To Machine – Typically this material is gummy and will not hold a bright finish. Machining difficulty results in bow and twist. Is subject to bow later in service (memory).

Corrosion Resistant – Most frequently used grade of stainless steels in maintenance applications because of high degree of resistance to general corrosion.

Low Strength – Not hardenable by heat treatment. Can be supplied with some hardness developed by “strain hardening”, but limited to sizes smaller than 1-3/4” round. Strain hardening results in higher retained stress.

Susceptible To Galling – Most OEM parts are supplied with both male and female parts made from a 304 and/or 316 series stainless. Parts tend to seize and gall. Threads are easily damaged due to galling and low strength.

High Degree Of Retained Stress – High degree of memory. Gummy during machining operations. Moderate machining will results in bow, twist and some movement.

Commercial Straightness – Subject to movement in machining and service. Chatter, vi-bration, wear on bearings, seals and bushings.

Limited Options – Available in cold drawn, centerless ground and polished or peeled. Tolerances are typically plus and minus.

Standard Lengths – Typically supplied in 10/13 foot random lengths. Difficult to purchase in custom lengths or small pieces.

Information provided is not to be utilized for engineering purposes. It is furnished for sales and marketing comparison purposes.