Haynes Stellite® 25 (HS-25) - Alloy L-605 - UNS R30605 - F90 - Alacrite - CoNiCrW AlloyHome > All Alloys > Alloy L-605
|Table of Contents|
|General Data||Mechanical Properties|
|Specifications||Physical Properties & Application Data|
|Machining, Welding, & Processing||References|
Alloy L605 (also known as Haynes® 25) is the strongest of the fabricable cobalt alloys and is useful for continuous service to 1800 °F. L605 also maintains good strength up to 2150 °F.
Because of its long and widespread use, this alloy has been the subject of many investigations to determine its properties over a wide range of conditions. The vast research makes this alloy an unusually well characterized material. When exposed for prolonged periods at intermediate temperatures, alloy L605 exhibits a loss of room temperature ductility in much the same fashion as other superalloys, such as alloy X or alloy 625.
L605 is welded using gas tungsten arc, gas metal arc, shielded metal arc, electron beam, and resistance welding. Submerged arc welding is not recommended. Use good joint fit-up, minimum restraint, low interpass temperature, and cool rapidly from welding. For maximum ductility, fabricated components should be annealed 2150-2250 °F and rapidly cooled.
L605 maintains good oxidation resistance up to 1900 °F and has a unique ability to resist corrosion in very severe environments. It is highly resistant to hydrochloric acid, nitric acid, and wet chlorine (exercise care in its selection at certain concentrations and temperatures).
|Nominal Composition (Weight%)|
We can cold work high strength into your material to meet your high-performing requirements. We also facilitate in-house size conversions, rotary forging and drawing, and annealing materials, as well as our cold finish machining capabilities range of +/- 0.0002" Ø.
For more information, you can contact us at 1-800-945-8230, and request our GFM Bulletin; you can also view our brochure online! There's also more information about our offered services on our production capabilities page.
We have expanded our abilities to work smaller diameter bar down to nominal wire. Also, check out our weld wire to finish the job right!
- Gas turbine engine combustion chambers and afterburners.
- High temperature ball bearings and bearing races.
- Heart valves.
- Outstanding high temperature strength.
- Oxidation resistant to 1800 °F.
- Galling resistant.
- Resistant to marine environments, acids, and body fluids.
The typical properties listed can usually be provided in rounds, sheet, strip, plate, & custom forgings. We have the equipment to produce small quantities in special sizes to meet our customers’ specific needs. The table below shows Haynes' Nominal Mechanical/Tensile Properties of Alloy 25 (L-605) Rod & Bars. For most common forms and exceptions, check out the datasheet linked underneath the table.
|Form||Cond.||UTS ksi (MPa)||0.2% OS YS ksi (MPa)||Elong., %||Rockwell Hardness|
|Sheet||Solution Treated||144.5 (996)||69 (476)||54.7||97B|
|Plate||Solution Treated||145.1 (1000)||68.7 (474)||58.8||99B|
|Bar||HR & Solution Anneal||147 (1015)||73 (505)||60||98B|
UTS = Ultimate Tensile Strength, YS = Yield Strength, OS = Offset, HR = Hot RolledLink to Haynes' datasheet/brochure on HS 25
Note that the specifications listed are common for this alloy but are for reference only and may be specific to a certain form. The specifications listed are not comprehensive nor indicative of any edition, revision, or similar such as an amendment. Please, reach out to our sales department to request the Material Test Report (MTR) or to confirm your required specifications.
|Identification||UNS R30605, EN 2.4964|
|Cold Worked Bar||MCS 1031|
|Sheet, Plate, or Strip||AMS 5537|
|Weld Wire||AMS 5796|
|Weld Electrode||AMS 5797|
|TYPICAL TENSILE PROPERTIES, COLD-WORKED SHEET|
in 2 in.
Cold Red. = Cold Reduced
Metal-to-Metal Galling Resistance
Cobalt Alloy L605 exhibits excellent resistance to metal galling. Wear results shown below were generated for standard matching material room-temperature pin on disc tests.
Wear depths are given as a function of applied load.
The results indicate that alloy L605 is superior in galling resistance to many materials, and is surpassed only by Ultimet® alloy and Stellite® alloy 6B.
Both of these materials were specifically designed to have excellent wear resistance.
|Room-Temperature Wear Depth For Various Applied Loads|
|3,000 lbs. (1.365 Kg)||6,000 lbs. (2.725 Kg)||9,000 lbs. (4.090 Kg)|
High Temperature Hardness Properties
The following are results from standard vacuum furnace hot hardness tests. Values are given in originally measured DPC (Vickers) units and conversions to Rockwell C/B scale in parentheses.
|Vickers Diamond Pyramid Hardness (Rockwell C/B Hardness)|
|70°F (20°C)||800°F (425°C)||1000°F (540°C)||1200°F (650°C)||1400°F (760°C)|
|Solution Treated||251 (RC22)||171 (RB87)||160 (RB83)||150 (RB80)||134 (RB74)|
|15% Cold Work||348 (RC22)||254 (RC23)||234 (RC97)||218 (RC95)||--|
|20% Cold Work||401 (RC35)||318 (RC32)||284 (RC27)||268 (RC25)||--|
|25% Cold Work||482 (RC48)||318 (RC32)||300 (RC30)||286 (RC28)||--|
Aqueous Corrosion Resistance
Haynes 25 (L605) was not designed for resistance to corrosive aqueous media. Representative average corrosion data are given for comparison. For applications requiring corrosion resistance in aqueous environments, Ultimet alloy and Hastelloy's corrosion-resistant alloys should be considered.
|Average Corrosion Rate, mils per year (mm per year)|
|1% HCl (Boiling)||10% H2SO4 (Boiling)||65% HNO3 (Boiling)|
|C-22™ alloy||3 (0.08)||12 (0.30)||134 (3.40)|
|Alloy L605||226 (5.74)||131 (3.33)||31 (0.79)|
|Type 316L||524 (13.31)||1868 (47.45)||9 (0.23)|
Cobalt alloy L605 exhibits good resistance to both air and combustion gas oxidizing environments and can be used for long-term continuous exposure at temperatures up to 1800°F (980°C). For exposures of short duration, alloy L605 can be used at higher temperatures.
|COMPARATIVE BURNER RIG OXIDATION RESISTANCE 1000-HOUR EXPOSURE AT 1800°F (980°C)|
|Type 310 Stainless Steel||13.7||348||16.2||411||16.5||419|
Oxidation Test Parameters
Burner rig oxidation tests were conducted by exposing samples 3/8 in. x 2.5 in. x thickness (9 mm x 64 mm x thickness), in a rotating holder, to products of combustion of No. 2 fuel oil burned at a ratio of air to fuel of about 50:1. (Gas velocity was about 0.3 mach). Samples were automatically removed from the gas stream every 30 minutes and fan-cooled to near ambient temperature and then reinserted into the flame tunnel.
|COMPARATIVE OXIDATION RESISTANCE IN FLOWING AIR|
|1800°F (980°C)||2000°F (1095°C)||2100°F (1150°C)|
When exposed for prolonged periods at intermediate temperatures, Cobalt alloy L605 exhibits a loss of room temperature
ductility in much the same fashion as some other solid-solution-strengthened superalloys, such as Hastelloy®
alloy X OR Inconel® ALLOY 625. This behavior occurs as a consequence of the precipitation of deleterious phases.
In the case of alloy L605, the phase in question is CO2 W laves phase.
Haynes® alloy 188 is significantly better in this regard than alloy L605.
|ROOM-TEMPERATURE PROPERTIES OF SHEET AFTER THERMAL EXPOSURE*|
Temp. °F (°C)
The alloys described here work harden rapidly during machining and require more power to cut than do the plain carbon steels. The metal is ‘gummy,’ with chips that tend to be stringy and tough. Machine tools should be rigid and used to no more than 75% of their rated capacity. Both work piece and tool should be held rigidly; tool overhang should be minimized. Rigidity is particularly important when machining titanium, as titanium has a much lower modulus of elasticity than either steel or nickel alloys. Slender work pieces of titanium tend to deflect under tool pressures causing chatter, tool rubbing, and tolerance problems. Make sure that tools are always sharp. Change to sharpened tools at regular intervals rather than out of necessity. Titanium chips in particular tend to gall and weld to the tool cutting edges, speeding up tool wear and failure. Remember- cutting edges, particularly throw-away inserts, are expendable. Don't trade dollars in machine time for pennies in tool cost.
Feed rate should be high enough to ensure that the tool cutting edge is getting under the previous cut thus avoiding work-hardened zones. Slow speeds are generally required with heavy cuts. Sulfur chlorinated petroleum oil lubricants are suggested for all alloys but titanium. Such lubricants may be thinned with paraffin oil for finish cuts at higher speeds. The tool should not ride on the work piece as this will work harden the material and result in early tool dulling or breakage. Use an air jet directed on the tool when dry cutting to significantly increase tool life.
Lubricants or cutting fluids for titanium should be carefully selected. Do not use fluids containing chlorine or other halogens (fluorine, bromine or iodine), in order to avoid risk of corrosion problems. The following speeds are for single point turning operations using high speed steel tools. This information is provided as a guide to relative machinability, higher speeds are used with carbide tooling.
- solution annealed
|RA 353 MA~||40-60||25-35|
|Greek Ascoloy Annealed||90||55|
- solution treated
- aged Hi 025
Haynes® is a registered trademark of Haynes International.
Data referring to mechanical properties and chemical analyses are the result of tests performed on specimens obtained from specific locations of the products in accordance with prescribed sampling procedures; any warranty thereof is limited to the values obtained at such locations and by such procedures. There is no warranty with respect to values of the materials at other locations.