Generic selectors
Exact matches only
Search in title
Search in content
Search in posts
Search in pages

Durelloy is a well balanced, fine grained electric furnace alloy steel, delivered standard in the heat treated hardness of Rockwell C 28–32. Durelloy is produced for applications requiring high tensile strength, resistance to wear, shock, and fatigue. Each heat lot must pass rigid quality control procedures which assure consistent physical and chemical standards.

In the pre-heat treated condition, Durelloyis excellent for applications requiring high torque and torsional strains. The combined alloy blend of chrome, molybdenum,and manganese produces excellent physical properties, depth of heat treatment, resistance to many forms of corrosion, excellent toughness, and good ductility.

Durelloy Replaces Both Carbon And Alloy Grade Standard Steels

  • Carbon Grades
  • C10xx*
  • C11xx
  • C12xx
  • Chrome-Moly Grades
  • 41xx*
  • Nickel-Moly Grades
  • 46xx
  • 48 xx
  • Nickel-Chrome Grades
  • 31xx
  • 33xx
  • Chrome-Nickel-Moly Grades
  • 43xx*
  • 47xx
  • 81xx
  • 86xx
  • 87xx
  • 88xx
  • 93xx
  • 98xx

* xx indicates amount of Carbon content.

Alloy steel marketed under various trade names are included, but are too extensive for listing. Contact your Ameralloy representative or Central Sales Office at 847-967-0600 for assistance in clarification and comparison.

Applications

  • Arbors
  • Armature shafts
  • Axles
  • Bolts & studs
  • Boring bars
  • Bushings
  • Cement mill shafts
  • Chain links & pins
  • Conveyer shafts
  • Conveyer rollers
  • Crane axles
  • Crank shafts
  • Drill bit bodies
  • Drive shafts & gears
  • Feed screws
  • Flame hardened
  • parts
  • Gears
  • Gear shafts
  • Hammer shafts
  • Hoist shafts
  • Hooks
  • Hubs
  • Impeller shafts
  • Journals
  • Lead screws
  • Line shafts
  • Mining equipment
  • Motor shafts
  • Mandrels
  • Nuts
  • Pinions
  • Pins
  • Piston & push rods
  • Power shovel shafts
  • Pump shafts & rods
  • Shafts
  • Spindles
  • Sprockets
  • Studs
  • Textile equipment
  • Tie rods
  • Tool holders
  • Tracks
  • Track pins
  • U-Bolts

Features And Advantages

  • Pre-hardened, heat treated, stress relieved
  • Machine straightened to minimize distortion and run-out
  • Fine grain microstructure
  • Free machining (75% machinability rating)
  • Work hardening capabilities
  • Fatigue resistant
  • High shear strength, abrasion resistant
  • Precision controlled analysis
  • Excellent temperature tensile properties up to 1100°F

Specials, Heat Treat & Machining

  • Durelloy pre-machined flats Thickness 1/2”–2”, width 2” to 24”, length 72”. Blanchard ground top and bottom TOL plus .020–.030
  • Durelloy special heat-treat
  • Durelloy annealed Every Durelloy size is available in the annealed condition, and can be further heat treated
  • Durelloy forgings Custom forging to your specifications
  • Custom machining and grinding

Durelloy Sizes Available For Immediate Shipment

Rounds Squares Hexagons Flats Plates

1/2

3-1/8

7-1/4

1-1/4

3/8

1/2 x 2

1-1/8 x 2-1/2

x 3-1/2

3/8 x 96 x 120

5/8

3-1/4

7-1/2

1-1/2

1/2

x 3

x 4-1/2

2 x 4

1/2 x 96 x 120

3/4

3-3/8

7-3/4

1-3/4

5/8

x 4

1-1/4 x 2

x 4-1/2

3/4 x 96 x 120

7/8

3-1/2

8

2

3/4

5/8 x 3

x 2-1/2

x 5

1 x 96 x 120

1

3-5/8

8-1/4

2-1/4

7/8

x 2-1/2

x 3

x 6

1-1/4 x 96 x 120

1-1/8

3-3/4

8-1/2

2-1/2

1

x 3

x 3-1/2

x 8

1-1/2 x 96 x 120

1-1/4

4

8-3/4

2-3/4

1-1/8

x 4

x 4

2-1/2 x 3

2 x 96 x 120

1-3/8

4-1/8

9

3

1-1/4

x 4-1/2

x 4-1/2

x 3-1/2

2-1/2 x 96 x 120

1-1/2

4-1/4

9-1/2

3-1/2

1-3/8

3/4 x 1

x 5

x 4

3 x 96 x 120

1-5/8

4-3/8

10

4

1-1/2

x 2

x 6

x 4-1/2

3-1/2 x 96 x 144

1-3/4

4-1/2

10-1/2

4-1/2

1-5/8

x 3

x 8

x 5

4 x 96 x 144

1-7/8

4-3/4

11

5

1-3/4

x 4

1-1/2 x 2

x 6

5 x 96 x 144

2

5

11-1/4

5-1/2

2

1 x 1-1/2

x 2-1/2

x 8

6 x 96 x 144

2-1/8

5-1/4

11-1/2

6

2-1/8

x 2

x 3

3 x 4

8 x 96 x 144

2-1/4

5-1/2

12

8

2-1/4

x 2-1/2

x 3-1/2

x 5

 

2-3/8

5-3/4

14

 

2-3/8

x 3

x 4

x 6

 

2-1/2

6

15-1/2

 

2-1/2

x 3-1/2

x 4-1/2

x 8

 

2-5/8

6-1/4

16

 

2-3/4

x 4

x 5

3-1/2 x 8

 

2-3/4

6-1/2

18

 

3

x 4-1/2

x 6

4 x 5

 

2-7/8

6-3/4

20

 

3-1/4

x 5

x 8

x 6

 

3

7

24

 

3-1/2

x 6

2 x 2-1/2

x 8

 

 

 

 

 

 

 

x 3

 

 

Lengths: 18’-20’ or custom cut to size.

Durelloy™ HEAT TREATED ALLOY

metallurgical data

Mechanical Properties As stocked in the heat treated (hardened) condition

Tensile Strength PSI Yield Point PSI Elongated In 2” % Reduction Of Area % Brinell Hardness BHN Charpy V-Notch FT-LB
155/172,000 140/155,000 21.0/18.0 62/54 312/330 60/25

Properties are typical over a wide range of cross-sectional dimensions. Refer to following charts.

Tempering, Tensile, Yield Data

Durelloy bar samples oil-quenched from 1550°F (843°C).

Normalized Air cooled from 1550°F – 1650°F (843°C – 899°C)

Section Size Inches Tensile Strength PSI Yield Point % Elongated In 2” % Reduction Of Area % Brinell Hardness BHN Charpy V-Notch FT-LB
1 214,500 176,000 15.3 53.7 402 13
2 208,750 172,500 15.7 54.2 394 14
4 198,000 165,750 16.5 55.1 376 16
6 184,500 151,250 17.2 56.0 358 18
8 168,000 138,500 17.8 56.4 332 20

Annealed Slow cooled from 1600°F (871°C)

1 116,250 84,500 28.5 68.2 210 81

Durelloy™ HEAT TREATED ALLOY

working instructions

Heating At 50° Per Hour Cooling At 50° Per Hour
AC1 AC3 AR3 AR1 Ms
1360°F 1495°F 1350°F 1220°F 525°F
738°C 813°C 732°C 660°C 274°C

Forging

Heat thoroughly to 2250°F (1232°C) Max. Reheat as often as necessary to finish forging operation, but do not work below 1550°F (816°C). May be air-cooled (normalized) or oil-quenched after forging. For maximum properties, tempering is recommended prior to cooling below 150°F (66°C). Refer to Metallurgical Data for resultant properties.

Annealing

Heat to 1500°–1600°F (816°–871°C). Hold for 1 hour per inch of greatest thickness. Slow cool to 500°F (260°C). Air cool. Refer to Metallurgical Data for resultant properties.

Normalizing

Heat to 1550°–1650°F (843°–899°C). Soak thoroughly. Air cool. Refer to Metallurgical Data for resultant properties.

Hardening

  • Heating Heat slowly and uniformly to 1550°–1650°F (843°–899°C). Hold for 1 hour per inch of greatest thickness. Soak thoroughly.
  • Quenching Oil-quenching preferred. Agitate quenching medium as section size increases to accelerate process and provide more uniform cooling.
  • Tempering All steels possess residual stresses and brittleness after normalizing or hardening by quenching, regardless of quenching medium. When possible, tempering is necessary to relieve these stresses and impart the required combination of strength and ductility (toughness). Tempering consists of heating to a temperature below the lower critical (AC1–1360°F), and holding for 1 hour per inch of greatest thickness. Follow tempering by cooling in still air. Begin tempering before quenched section cools below 150°F. Durelloy can be tempered in the range of 300°–1300°F (149°–704°C), depending on the application and final properties desired (wear vs. toughness ratio). The lower the tempering temperature, the higher the resultant hardness and resistance to wear. The higher the tempering temperature, the lower the resultant hardness and the greater the strength/toughness combination.

Hardness properties of .505” diameter test specimens,oil-quenched from 1550°F (843°C) and tempered as shown:

Tempering Temperature Hardness
°F °C BHN
300 149 612
500 260 548
700 371 498
900 482 439
1100 593 365
1300 704 289

Durelloy™ HEAT TREATED ALLOY

surface hardening

Surface (Case) Hardening

  • Flame hardening In some applications, it is desirable that surfaces subjected to extreme wear be harder than other surfaces of the same piece. The surfaces to be further hardened are heated with an oxyacetylene flame torch to a temperature of 1500°–1700°F (red/orange color), then rapidly quenched. The exact quenching medium is determined by the percentage of heated surface. Small surfaces of larger pieces can simply be airquenched because of rapid cooling due to the conduction of heat away from the small heated surface into the larger adjacent surfaces. Pieces with a larger percentage of surfaces to be hardened should be quenched by spraying with water. Residual heat after quenching will relieve hardening stresses. This flame hardening process can yield hardenesses 0f 578–698 BHN with a hardness depth of up to 1/4”.
  • Carburizing Carburizing is the process of adding additional carbon to surface of steel by heating the metal to a temperature below its melting point in contact with carbonaceous solids (pack-carburizing), liquids (liquidcarburizing), or gases (gas-carburizing). High surface hardnesses are obtained while the core retains strength, ductility, and toughness. Localized carburizing may also be accomplished by applying a protective coating which the carbon will not penetrate. Commercial pastes are widely available.

Durelloy carburizing case depths (inches), when carburized and quenched immediately in agitated oil and tempered at 300°–400°F. Resultant surface hardness of 615/700 BHN:

Hours 1550°F (843°C) 1650°F(899°C) 1750°F(954°C) 1850°F(1010°C)
2 .024 .034 .046 .062
4 .033 .047 .064 .089
6 .040 .058 .079 .109
8 .046 .067 .090 .123
10 .051 .072 .101 .137
12 .057 .079 .111 .151
16 .065 .089 .126 .172
20 .072 .101 .141 .192
24 .079 .111 .155 .208

Durelloy™ HEAT TREATED ALLOY

field welding data

No special electrode needed. Standard low-hydrogen rods recommended for maximum strengths. Most popular AWS designations are E7016, 7018, 10016 and (10018–preferred).

  • Because of the carbon and other alloy elements, pre-heating to approximately (800 degrees) is recommended. Keep at pre-heated temperature during welding to prevent under bed cracking.
  • Travel slowly and straight.
  • Welding rods should be clean and dry. Insure welding surface is clean. Hold inter-pass temperature at (800 degrees). Use minimum recommended arc voltage and amperage and reduce amperage slightly for secondary and finishing passes.
  • Use several small stringer beads rather than deposits. A weave bead of (2½) times the rod diameter can be used. Brush slag and dirt from the beads frequently
  • When welding cracks, cracks should be U-ed not V-ed; sharp angles tend to induce cracking. Take care to grind away any and all existing cracks.
  • Use the smallest-diameter electrode, rod or wire that will do the job.
  • To relieve welding stresses, a post-heat of approximately (400 degrees) should be maintained for (2) hours.