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Eastern
Tool
Steel Service, Inc.
1045 Delaum Rd.
P.O.
Box 857
St.
Marys, Pa 15857
Phone:
(814) 834-7224
Fax:
(814) 834-7225
Or
Contact Us
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4140 Alloy Steel Data Sheet
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4140 is an alloy steel that is supplied in either the annealed or prehardened condition. The prehardened condition is heat treated to a medium hardness (HRC 28/32) and is designated as 4140 HT. 4140 annealed is supplied in the soft condition and can be hardened to RC 54. 4140 annealed is designated as 4140 Ann or simply 4140. 4140 HT is supplied in many forms such as hot rolled or turned, ground and polished rounds and block or DCF plate to be used as a holder material for high strength structural components.
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Typical Chemistry |
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Carbon
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0.42% |
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Silicon
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0.30% |
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Molybdenum |
0.20% |
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Manganese |
1.00% |
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Chromium |
1.00% |
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Typical Applications |
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Support Plates |
Filler
Blocks |
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Punch Holders |
Structural Parts |
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Clamps |
Base
Plates |
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Gages |
Molds |
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Brake Dies |
Jigs |
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Fixtures |
Tool
Holders |
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High-Strength Parts |
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- Annealed
Hardness: BHN 185/200.
Thermal Treatments.
-
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Annealing: 1550F (840C), hold 2 hours, slow cool 50F(30C)/hr. max. to
1200F (650C), then air or furnace cool. Hardness BHN 185/200.
Stress
Relieving:
Annealed Material: 1100-1300F (595-740C), hold 2 hrs, air cool.
Hardened Material: 50-100F (30-55C) below last tempering temperature,
hold 2 hrs, air cool.
Straightening: Best done warm 400-800F (205-425C)
Hardening: (Atmosphere or Vacuum Furnace)
Preheat: 1250-1300F (675-705C), equalize
High Heat: 1550-1600F (840-870C), soak 10 to 30 minutes. For vacuum
hardening, use the high side of the high heat range and soak times.
Quench: Oil quench to hand warm, 150F (650C). Temper immediately.
Water quenching from 1550F (840C) may be used for simple shapes and larger
sections. Note vacuum furnaces must have oil quench capability to achieve
comparable results.
Temper: Tempering at 400-1200F (205-650C) for 1 hour per inch (25mm)
of thickness at temperature is recommended (2 hrs min). Air cool to room
temperature.
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Welding
Medium
carbon steel filler material.
Annealed
Material:
Preheat: 400F (205C)
Postheat: 500-600F (260-315C)
Hardened
Material:
Preheat: 50F (30C) less than last tempering temperature.
Postheat: 50F (30C) less than last tempering temperature.
Physical Properties
Modulus of Elasticity
.......................29 psi x 106(200
GPa)
Specific Gravity
......................................................(7.81)
Density
........................................0.282
lb/in3(7810 kg/m3)
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