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Introduction
Monel R405 is the free machining version of Monel 400. It is a nickel-copper alloy with a controlled amount of sulfur added to provide sulfide inclusions that act as chip breakers during machining. Like Monel 400, alloy R-405 is resistant to sea water and steam at high temperatures as well as to salt and caustic solutions. Monel R405 is a solid solution alloy that can only be hardened by cold working. This nickel alloy exhibits characteristics like good corrosion-resistance, good weldability and high strength. A low corrosion rate in rapidly flowing brackish or seawater combined with excellent resistance to stress corrosion cracking in most freshwaters, and its resistance to a variety of corrosive conditions led to its wide use in marine applications and other non-oxidizing chloride solutions. This nickel steel alloy is particularly resistant to hydrochloric when they are de-aerated. As would be expected from its high copper content, alloy R-405 is rapidly attacked by acid and ammonia systems.
Monel R405 Composition
The chemical composition of stainless steel grade Monel R405 is outlined in the following table
| Ni | Cu | Fe | S | Mn | C | Si |
63.0 min | 28.0-34.0 | 2.5 max | .025-.060 | 2.0 max | .3 max | .5 max |
Grade Specification
| Grade | UNS | DIN | EN | AMS | ASTM | JIS | |
| Monel R405 | N04405 | 2.4363 | AMS 4674 | ASTM B164 | - | ||
Monel R405 Characteristic
Characteristics are essentially the same as those of Monel 400 such as:
Monel R405 Mechanical Properties
Nominal Mechanical Property Range of Monel Alloy R-405
| Condition | Tensile (ksi) | .2% Yield (ksi) | Elongation % | Hardness Brinell (3000 kg) | Hardness Rockwell B |
Annealed | 70-85 | 25-40 | 50-35 | 110-140 | 60-76 |
Hot-Finished | 75-90 | 35-60 | 45-30 | 130-170 | 72-86 |
Cold-Drawn, As-Drawn | 85-115 | 50-105 | 35-15 | 160-245 | 85-23C |
Monel R405 Applications
