Stainless Steels
MIR 50® - Non-Galling, High Strength Stainless Pump Shaft
Corrosion Resistance – Similar to that of 316L Stainless, Mir 50 is engineered for use in severe service applications. Most commercial stainless grades fight corrosion but lack strength. Alloy grades and hardenable stainless grades have strength but lack corrosion resistance. Mir 50 does both.
High Strength – Mir 50 is a thermally hardened martensitic stainless alloy. It has similar strength levels like a 4340 Q&T alloy bar product with approx. 140KSI tensile strength. Austenitic grades, such as 304 and 316 stainless, require strain hardening or cold reduction to obtain their hardness. As the shaft size increases, the hardness, strength, and wear resistance, drop off substantially. Mir 50 is thermally treated, the hardness and strength properties remain virtually constant, from the smallest to the largest bars.
Double Stress Relieved – Mir 50 shafts are shipped virtually free of retained stress. This material will be a welcomed change from the warp and bend, common to other stainless grades. Because Mir 50 has "low memory" properties, these shafts will not exhibit the "movement" and "walking" commonly experienced when machining 304, 316, and other stainless grades.
Ease of Machining – Mir 50 machines easily. It is not gummy, and it will hold a bright finish. Because Mir 50 machines easily, there is little induced stress to cause movement once the shaft is in service. You save time and money by getting the shaft into service quickly and eliminating many of the previously required straightening operations.
Non-Galling – Mir 50 is non-galling. It is compatible with almost every other stainless grade, as well as carbon and alloy grades of steel. Maintenance people will find that hex nuts, caps, and collars come apart easily for inspection, replacement and repair.
Pump Shaft Straightness – Mir 50 has been specifically designed as a maintenance material suitable for pump shaft applications in highly corrosive environments. It is strong, machines easily, and stays straight during machining and in service. Mir 50 is also available with a semi-finished, oversized, surface finish, so that the size will make the size. Specify semi-finished pump shaft stock when you do not require TG&P stock.
Excellent Low Temperature Properties – Mir 50 offers excellent mechanical properties at low service temperatures; @ -325°F on a 1" Diameter Bar
| Typical Yield Strength | – | 136,000 P.S.I. |
| Typical Tensile Strength | – | 219,000 P.S.I. |
| Impact Strength | – | 36 Ft/Lbs |
Compare Mir 50 and ASC2250 LDX to commercial grades of stainless 304L, 316L, 410 and 416 see pages 49, 50, and 51.
(Past Protected Trade Name of Ludlow Steel Co.- RH4500®)
|
|
Available Sizes |
||||||||||||||||||||||||||||||||||||||||||||||||||||
* Shaded sizes may have modified analysis due to production restrictions. |
Available Lengths
Random Bars Up To 29 Ft
Cut To Length Bars Per Your Requirements
Agency Concurrence
NACE MR-01-75-97 revision
API – 6A
FDA
AMS-5763 (chemistry only)
Typical Straightness Standard
Pump Shaft Straightness is .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.
Service Temperature
To maintain the unusually high degree of toughness, service temperature should be limited to 800°F, although Mir 50 exhibits excellent oxidation resistance to 1200°F.
Mir 50 is boxed to protect the surface finish and straightness of the bar.
View our online catalog for PDF brochures on these and other products.
