Stainless Steels

Mir 50® Stainless

Precipitation Hardened, Non-Galling, PSQ Stainless

Mir50 is a (modified) Custom 450® pump shaft stainless steel that blends toughness and corrosion resistance into one steel. Mir50 is a precipitation hardening, martensitic stainless steel which does exhibit corrosion resistance similar to your 300 series stainless steels but with nearly three times the yield strength. Typical hardness is 258/294 BHN. Typical tensile strength is 140,000 PSI.

Mir50 offers excellent resistance to galling, corrosion and shock in severe service applications. Well known as the “4340 of the stainless world”. Agency concurrence includes API-6A, FDA, AMS-5763 (chemistry only) and NACE MR-01-75-097 revision.

Consider using Mir50 in place of certain commercial grade stainless steel including: 416, 410, 17-4PH, 304L, and 316L depending upon the requirement.

Material is offered in three options depending upon your requirements: Pump Shaft Quality (PSQ) Shafts, Rough Turned Oversize (RTOS) Bar Stock, and as (RTOS) Bushing Stock. Call or email us for a quote.

Spacing

Features

High Strength

Galling Resistant

Corrosion Resistant

Fatigue Resistant

Double Stress Relieved

Resists Shock

Machinable

Weldable

Sour Service Approved

Agency Concurrence

NACE MR0175-97

AMS-5763 (chemistry)

FDA and API-6A

Typical Properties*

Hardness258/294 BHN
Tensile 140,000 P.S.I.
Yield 108,000 P.S.I.
Elongation in 2″26%
Reduction of Area65%
Charpy “V” Notch 105 @ 70°F

*Based on 1/2″ test piece

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Service Temperature

800°F (constant); Oxidation Resistant to 1200°F

Available Sizes1

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″
1-1/8″
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″
1-7/8″
1-15/16″
2″
2-1/8″
2-3/16″
2-1/4″
2-3/8″
2-7/16″
2-1/2″
2-9/16″
2-5/8″
2-11/16″
2-3/4″
2-15/16″
3″
3-1/4″
3-3/8″
3-7/16″
3-1/2″
3-3/4″
3-15/16″
4″
4-3/16″
4-7/16″
4-1/2″
5″
5-1/2″
6″

1Certain Sizes may have modified analysis relative to production requirements.

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Lengths

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

Typical Straightness Standard

Pump Shaft Straightness ONLY = .005″ in the first 5 feet, plus .0015″ for each additional foot. We take extra  precautions to protect small diameter bars with longer lengths but straightness is perishable.

Up to 1-1/2” Round
(+.000”/-.001”)
Over 1-1/2” to 3-1/2” Round
(+.000”/-.002”)
Over 3-1/2” to 4-1/2” Round
(+.000”/-.003”)
Over 4-1/2” to 5-1/2” Round
(+.000”/-.004”)
Over 5-1/2” and Above
Call for details

PSQ – standards for Pump Shaft Quality / RTOS – standards for Rough Turned Oversize

Spacing

Applications

  • Agitator Shafts
  • Valve Stems
  • Pump Shafts
  • Gears
  • Journals
  • Line Shafts
  • Spindles
  • Mixer Shafts
  • Fan Shafts
  • Vertical Cylinders

Custom 450® is a registered trademark of Carpenter Technology Corporation.

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(equivalent to NASS 45®)

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For a downloadable PDF flyer for our Mir 50® click on the button below