VascoMax 250 (Maraging 250)
General Characteristics of VascoMax 250 (Maraging 250)
VascoMax 250 (Maraging 250) is a strong, nickel alloy with outstanding ductility, offering ease of machining and forming. VascoMax 250 resists corrosion from saltwater and industrial atmospheres and can be readily welded.
Chemical Composition of VascoMax 250
- Carbon 0.03 max
- Silicon 0.10 max
- Manganese 0.10 max
- Sulfur 0.03 max
- Phosphorus 0.03 max
- Molybdenum 4.60-5.00
- Nickel 18.00-19.00
- Cobalt 7.00-8.50
- Titanium .30-.50
- Aluminum 0.5-.15
- Boron .006 max
- Zirconium 0.02 added
- Calcium 0.05 added
- Iron remainder
Heat Treatment of VascoMax 250
- Anneal by holding at 1475° to 1525°F (802° to 829°C) for one hour for every inch of thickness, then air cool
- Age after solution anneal by holding at 875° to 925°F ( 468° to 496°C) between 3 and 6 hours, then air cool
Applications of VascoMax 250
- Aircraft assemblies
- Mortar tubes
- Extrusion dies
- Rocket motor cases
- Pressure vessels
Machinability of VascoMax 250
- Difficult to machine when fully hardened
- Can be readily machined when solution treated or annealed
- Similar to Vasco 4340
- Rough turning with high-speed steel tools
- 40-60 sfpm
- 0.007-0.016 ipr feed
- 3/32-1/8” depth
- Sulpho-chlorinated cutting oil
- Finishing cuts
- 150-300 sfpm
- 0.0025-0.0035 ipr feed
- 0.010-0j.060 deep
- Finishing grinding
- 3000-4500 sfpm wheel speed
- 20ft./minute table speed
- 0.003” per pass downfeed
- 0.025” per pass cross feed
Workability of VascoMax 250
- Forge between 2300° and 1600°F (1260° to 871°C)
- Roll between 1900° and 1500°F (1038° and 816°C)
- Annealing can increase hardness from 28 to 30 Rockwell C to 35 Rockwell C
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