Mir50® vs 410 and 416 Comparison Chart
MIR50 NON-GALLING, HIGH STRENGTH STAINLESS STEEL
High Degree of Corrosion Resistance – Similar to type 316 stainless. Hardened “PH” Custom Stainless Alloy.
Elevated Strength Levels – Hardness as delivered Rockwell “C” 26/33. Typical tensile strength is approx. 140,000 PSI @ 28Rc. Can be hardened to Rockwell “C” 36/44 with very little loss in corrosion resistance.
Non-Galling – Compatible with most stainless, carbon and alloy grades of steel.
Ease of Machining – Engineered for ease of machining. Less induced stress and movement. No detrimental additives, such as sulfur and selenium.
Low Carbon Levels – (.05)
Low Degree of Memory – Low degree of retained stress. Very little movement during machining or in service.
High Degree of Wear Resistance – Can be safely hardened to wear plate levels of
Welds Easily – (see welding data).
Excellent Chemistry – Elevated nickel content with additions of Molybdenum, Columbium and Tantalum for corrosion resistance, strength and toughness.
Charpy “V” Notch Impact – approx. 105 ft/lbs @ 70°F (Rockwell “C” 28)
Stress Corrosion Test – 1% NaCl+.5% Acetic Acid + H/2S @ Rockwell “C” 33 w/ 60,000 PSI applied stress – no findings after 500 hours.
SAE 410 and 416 COMMERCIAL GRADE STAINLESS STEELS
Low Degree of Corrosion Resistance – General tool room grades of hardenable stainless. Worst of both worlds—not a great stainless; not a great alloy.
Lower Strength Levels – Most often delivered at Rockwell “C” 22/28. Typical tensile strength is 120,000 PSI @ 26Rc. Additional hardening diminishes corrosion resistance and lowers toughness.
Susceptible To Galling – Parts can seize and tear during routine disassembly.
Ease of Machining – Sulfur and Selenium are added to 410 to make it easier to machine (416). This tends to inhibit welding and lowers strength.
High Carbon Levels – (.15); Lowers corrosion resistance and toughness which will contribute to corrosion cracking.
High Degree of Memory – Retained stress causes bow and twist in thermal treatment, machining and in general service.
Low Degree of Wear Resistance – Further hardening diminishes corrosion resistance.
Welding Difficult – In 410, higher carbon increases susceptibility for weld cracks. 416 stainless is not recommended for welding.
Low Chemistry – No nickel enhancement. Generally speaking low strength and toughness.
Charpy “V” Notch Impact – approx. 38 ft/lbs @ 70°F (Rockwell “C” 28)
Stress Corrosion Test – 1% NaCl+.5% Acetic Acid + H/2S @ Rockwell “C” 35 w/ 60,000 PSI applied stress – visible change after 3 hours.
Information provided is not to be utilized for engineering purposes. It is furnished for sales and marketing comparison purposes.