Nichroloy


Nichroloy is a clean, fine-grain, alloy steel produced by the electric furnace process and furnished rough-turned for applications requiring exceptionally high tensile strength and resistance to wear, shock and fatigue. Rigid quality control assures a steel of consistently high chemical and physical properties. For the TG&P version of Nichroloy, please see ACCURLOY.

Benefits of Nichroloy

Longer Service Life:

Engineered to develop higher strength, finer finish, cleaner chemistry and better fatigue resistance than standard grades of alloys and carbon steels such as SAE 1045, 4140, 4150, 4340, etc.

Precision Finish:

Turned, ground and polished to very close tolerances, Nichroloy will save you time and money in machining and down-time.

Availability:

Baldwin International maintains one of the largest stocks of precision finished shafting in the U.S. With a full array of sizes from 1/4″ dia. to 9″ dia. in common 1/16″ increments, as well as metric sizes, we can supply your specific shaft how you want it and when you want it.

Compare Nichroloy to 4140

Factors4140NichroloyAdvantages of Nichroloy
Manufacturing ProcessOpen Hearth Furnace. Large heats, little uniform controlSmall Electric Furnace heatsGreater control, less defects, cleaner steel which increases toughness and service life
Tensile Strength (Heat Treated 28-32 RC)125,000 PSI155,000 PSI Typical (Higher on smaller diameters)Approximately 25% higher strength
Yield Strength (Heat Treated 28-32 RC)100,000 PSI130,000 PSI Typical (Higher on smaller diameters)Approximately 25% higher strength
Stress Relieved & Machine StraightenedOptional – must be specifiedStress relieved at millMinimizes Bowing and “Walking” during machining
Low Sulphur Vacuum DegassedNot a commercial practiceDegassed at millBuilds toughness by removing impurities in the steel
Fatigue ResistanceLow ToughnessHigh degree of toughnessHigher endurance limit. Will minimize fatigue caused by twisting and flexing in use.
Wear ResistanceHard and soft spots, Uneven wearUniform hardnessUniform hardness and less decarburization give increased wear life. Tends to work-harden with wear.
MachinabilityNot consistentUniformUniform grain and hardness offer better machinability

Common Applications for Nichroloy

Arbors
Armature Shafts
Axles
Bolts
Boring Bars
Chain Links
Chain Pins
Clevices
Conveyor Shafts and Rollers
Crank Shafts / Pins
Drag Line Parts
Drift Pins
Drill Shanks
Drive Shafts
Feed Screws
Fittings
Gears
Gear Shafts
Generator Shafts
Grinder Spindles
Gudgeons
High Pressure Valve Studs
Highly Stressed
Shafting
Hoist Hooks & Pins
Hoist Shafts
Hubs
Impeller Shafts
Jack Shafts
Journals
Lead Screws
Line Shafts
Machine Tool Pinions
Magneto Shafts
Mandrels
Mining Machine Parts
Motor Shafts
Nuts
Pinions
Pins
Piston Rods
Power Shovel Shafts
Propeller Shafts
Push Rods
Reamer Shafts
Renecking Spinning
Rollers
Rings
Screws
Set Screws
Shackles
Skidding Tools
Sleeves
Sleeve Shafts
Spindle
Spinning Rollers
Steam Shovel Parts
Steering Knuckles
Studs
Tie Rods
Thrust Shafts
Tongs
Transmission Screws
Valve Stems
Wearing Strips
Worms
Worm Gears
Wrist Pins

Nichroloy Size Range

DIAMETER SIZE (INCHES)
1/231/28
5/833/481/4
3/4481/2
7/841/483/4
141/29
11/443/491/2
13/8593/4
11/251/410
13/451/2101/2
17/853/411
26111/2
21/46 1/412
23/861/2121/2
21/263/413
23/47131/2
27/871/414
371/215
31/473/416

Nichrology comes in random and cut-to-length sizes up to 24 feet. Please inquire on your specific sizes.

Properties of Nichroloy

Typical As Delivered Mechanical Properties

HardnessRockwell C 28 to 32
Tensile Strength155,000 psi
Yield Strength130,000 psi
Reduction in Area50%
Elongation in 2″20%
Grain Size95% of 8 on Shepherd fracturegrain size standards

Heat Treatment

Forging1900°F – 2100°F
Hardening1525°F – 1575°F (oil quench)
Annealing1425°F – 1500°F (212 BHN)
Normalizing1600°F – 1650°F
Tempering(see chart)

Temper immediately after removal from oil quench.

Tempering Chart

(based on 1/2″ dia. test specimen)

DrawTemperature°FRockwell “C”Tensile PSIYield PSIElongation in 2″%Reduction in Area%
40054312,000274,0001235
50052296,000262,0001237
60050273,000240,0001238
80047256,000234,0001242
100042194,000175,0001550

Locations offering this product: