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Nichroloy
Accurloy 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

Factors
4140 Nichroloy Advantages of Nichroloy
Manufacturing Process Open Hearth Furnace. Large heats, little uniform control Small Electric Furnace heats Greater control, less defects, cleaner steel which increases toughness and service life
Tensile Strength (Heat Treated 28-32 RC) 125,000 PSI 155,000 PSI Typical (Higher on smaller diameters) Approximately 25% higher strength
Yield Strength (Heat Treated 28-32 RC) 100,000 PSI 130,000 PSI Typical (Higher on smaller diameters) Approximately 25% higher strength
Stress Relieved & Machine Straightened Optional - must be specified Stress relieved at mill Minimizes Bowing and "Walking" during machining
Low Sulphur Vacuum Degassed Not a commercial practice Degassed at mill Builds toughness by removing impurities in the steel
Fatigue Resistance Low Toughness High degree of toughness Higher endurance limit. Will minimize fatigue caused by twisting and flexing in use.
Wear Resistance Hard and soft spots, Uneven wear Uniform hardness Uniform hardness and less decarburization give increased wear life. Tends to work-harden with wear.
Machinability Not consistent Uniform Uniform 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

NIclength.jpg
DIAMETER SIZE (INCHES)
  1/2 3  1/2 8     
  5/8 3  3/4 8  1/4
  3/4 4      8  1/2
  7/8 4  1/4 8  3/4
1      4  1/2 9     
1  1/4 4  3/4 9  1/2
1  3/8 5      9  3/4
1  1/2
5  1/4
10     
1  3/4 5  1/2 10  1/2
1  7/8 5  3/4 11     
2      6      11  1/2
2  1/4 6 1/4 12     
2  3/8 6  1/2 12  1/2
2  1/2 6  3/4 13     
2  3/4 7      13  1/2
2  7/8 7  1/4 14     
3      7  1/2 15     
3  1/4 7  3/4 16     

Properties of Nichroloy

Typical As Delivered Mechanical Properties

Hardness
Rockwell C 28 to 32
Tensile Strength
155,000 psi
Yield Strength
130,000 psi
Reduction in Area
50%
Elongation in 2"
20%
Grain Size
95% of 8 on Shepherd fracture
grain size standards


Heat Treatment

Forging 1900°F - 2100°F
Hardening 1525°F - 1575°F (oil quench)
Annealing 1425°F - 1500°F (212 BHN)
Normalizing 1600°F - 1650°F
Tempering (see chart)
Temper immediately after removal from oil quench.
 

Tempering Chart

(based on 1/2" dia. test specimen)

Draw
Temperature
°F
Rockwell
"C"
Tensile
PSI
Yield
PSI
Elongation
in 2"
%
Reduction
in Area
%
400 54 312,000 274,000 12 35
500 52 296,000 262,000 12 37
600 50 273,000 240,000 12 38
800 47 256,000 234,000 12 42
1000 42 194,000 175,000 15 50

 

This is the English text. If you see this the code works, hurray!