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AISI 4140 Alloy Steel (UNS G41400)

AISI 4140 Alloy Steel (UNS G41400) Image

Alloy steels are designated by AISI four-digit numbers. They comprise different kinds of steels having composition exceeding the limitations of B, C, Mn, Mo, Ni, Si, Cr, and Va set for carbon steels.

AISI 4140 alloy steel is chromium, molybdenum, manganese containing low alloy steel. It has high fatigue strength, abrasion and impact resistance, toughness, and torsional strength. The following datasheet gives an overview of AISI 4140 alloy steel.

MACHINABILITY RATINGS

APPROXIMATE SURF. FT. PER MIN.

110

Percent RELATIVE SPEED BASED ON C-1212 as 100 Percent

66

Category::
Alloy Steel Grades
Hot Working:
AISI 4140 alloy steel can be hot worked at 816 to 1038°C (1500 to 1900°F)
Chemical Composition:
Element Content (%)
Iron, Fe 96.785 - 97.77
Chromium, Cr 0.80 - 1.10
Manganese, Mn 0.75 - 1.0
Carbon, C 0.380 - 0.430
Silicon, Si 0.15 - 0.30
Molybdenum, Mo 0.15 - 0.25
Sulfur, S  0.040
Phosphorous, P  0.035

Mechanical Properties:
Properties Imperial
Tensile strength 95000 psi
Yield strength 60200 psi
Bulk modulus (typical for steel) 20300 ksi
Shear modulus (typical for steel) 11600 ksi
Elastic modulus 27557-30458 ksi
Poisson's ratio 0.27-0.30
Elongation at break (in 50 mm) 25.70%
Hardness, Brinell 197
Hardness, Knoop (converted from Brinell hardness) 219
Hardness, Rockwell B (converted from Brinell hardness) 92
Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only) 13
Hardness, Vickers (converted from Brinell hardness) 207
Machinability (based on AISI 1212 as 100 machinability) 65

Density:
0.284 lb/in³
Thermal Properties:
Properties Metric Imperial
Thermal expansion co-efficient (@ 0-100°C/32-212°F) 12.2 µm/m°C 6.78 µin/in°F
Thermal conductivity (@ 100°C) 42.6 W/mK 296 BTU in/hr.ft².°F

Forming:
AISI 4140 alloy steel has high ductility. It can be formed using conventional techniques in the annealed condition. It requires more pressure or force for forming because it is tougher than plain carbon steels.
Welding:
AISI 4140 alloy steel can be welded using all conventional techniques. However, the mechanical properties of this steel will be affected if it is welded in the heat treated condition, and post weld heat treatment should be performed.
Heat Treatment:
AISI 4140 alloy steel is heated at 845°C (1550°F) followed by quenching in oil. Before hardening, it can be normalized by heating at 913°C (1675°F) for a long period of time followed by air cooling.
Forging:
AISI 4140 alloy steel is forged at 926 to 1205°C (1700 to 2200°F)
Other Designations:
BAR/WIRE:  SHEET/STRIP:  PLATE:
AMS-6378 AMS-6382 ASTM-A-193 A-304 A-320 A-322 A-331 MIL-S-5626 MIL-S-16974 ASTM-B-348 MIL-T-9047 AMS-6395 ASTM-A-505   AMS-6395
 TUBE:  PIPE: FORGINGS:
AMS-6381 AMS-6390 ASTM-A-519   COMMERCIAL AMS-6382 ASTM-A-646

Inventory:
In Stock
Cold Working:
AISI 4140 alloy steel can be cold worked using conventional methods in the annealed condition.
Annealing:
AISI 4140 alloy steel is annealed at 872°C (1600°F) followed by slowly cooling in the furnace.
Tempering:
AISI 4140 alloy steel can be tempered at 205 to 649°C (400 to 1200°F) depending upon the desired hardness level. The hardness of the steel can be increased if it has lower tempering temperature. For example, tensile strength of 225 ksi cab be achieved by tempering at 316°C (600°F), and a tensile strength of 130 ksi can be achieved by tempering at 538°C (1000°F).
Hardening:
AISI 4140 alloy steel can be hardened by cold working, or heating and quenching.
Melting Point:
2580°F
Applications:

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AISI 4140 Alloy Steel (UNS G41400)

AISI 4140 Alloy Steel (UNS G41400) Image

Alloy steels are designated by AISI four-digit numbers. They comprise different kinds of steels having composition exceeding the limitations of B, C, Mn, Mo, Ni, Si, Cr, and Va set for carbon steels.

AISI 4140 alloy steel is chromium, molybdenum, manganese containing low alloy steel. It has high fatigue strength, abrasion and impact resistance, toughness, and torsional strength. The following datasheet gives an overview of AISI 4140 alloy steel.

MACHINABILITY RATINGS

APPROXIMATE SURF. FT. PER MIN.

110

Percent RELATIVE SPEED BASED ON C-1212 as 100 Percent

66