Tool Steel Round Bar Manufacture 1.2311/1.2738/1.2344/1.2379/1.2080/1.2316/4140/4340
Tool Steel Round Bar Manufacture 1.2311/1.2738/1.2344/1.2379/1.2080/1.2316/4140/4340
Tool Steel Round Bar Manufacture 1.2311/1.2738/1.2344/1.2379/1.2080/1.2316/4140/4340
Tool Steel Round Bar Manufacture 1.2311/1.2738/1.2344/1.2379/1.2080/1.2316/4140/4340
Tool Steel Round Bar Manufacture 1.2311/1.2738/1.2344/1.2379/1.2080/1.2316/4140/4340
Tool Steel Round Bar Manufacture 1.2311/1.2738/1.2344/1.2379/1.2080/1.2316/4140/4340
Tool Steel Round Bar Manufacture 1.2311/1.2738/1.2344/1.2379/1.2080/1.2316/4140/4340

Tool Steel Round Bar Manufacture 1.2311/1.2738/1.2344/1.2379/1.2080/1.2316/4140/4340

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Product Overview

Description


Product Description






Introduce of 4140 Steel
AISI 4140 steel is a low alloy steel containing chromium, molybdenum, and manganese. It is widely used across numerous industries and is an excellent material choice due to its toughness, high fatigue strength, and abrasion and impact resistance. Not many grades can match the versatility and usefulness of 4140.

Applications of 4140 Steel 
This alloy finds many applications as forgings for the aerospace and oil and gas industries, along with myriad uses in the
automotive, agricultural and defense industries, Typical uses are forged gears and shafts, spindles, fixtures, jigs and collars.



































Chemical Properties of 4140 Steel



Grade




C




Cr




Mn




Si




Mo




S




P




4140




0.38-.43%




0.80-1.10%




0.75-1.0%




0.15-0.30%




0.15-0.25%




0-0.040%




0-0.035%


















































































Mechanical Properties of 4140 Steel


Properties


Metric


Imperial


Tensile strength


655 MPa


95000 psi


Yield strength


415 MPa


60200 psi


Bulk modulus (typical for steel)


140 GPa


20300 ksi


Shear modulus (typical for steel)


80 GPa


11600 ksi


Elastic modulus


190-210 GPa


27557-30458 ksi


Poisson's ratio


0.27-0.30


0.27-0.30


Elongation at break (in 50 mm)


25.70%


25.70%


Hardness, Brinell


197


197


Hardness, Knoop (converted from Brinell hardness)


219


219


Hardness, Rockwell B (converted from Brinell hardness)


92


92


Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only)


13


13


Hardness, Vickers (converted from Brinell hardness)


207


207


Machinability (based on AISI 1212 as 100 machinability)


65


65







Heat Treatment of 4140 Steel
AISI 4140 alloy steel is heated at 845°C (1550°F) followed by quenching in oil. Before hardening, it can be normalized by heating it at 913°C (1675°F) for a long period of time, followed by air cooling.

Forging of 4140 Steel
AISI 4140 alloy steel is forged at 926 to 1205°C (1700 to 2200°F)

Hot Working of 4140 Steel
AISI 4140 alloy steel can be hot worked at 816 to 1038°C (1500 to 1900°F)

Annealing of 4140 Steel
AISI 4140 alloy steel is annealed at 872°C (1600°F) followed by slowly cooling in the furnace.

Tempering of 4140 Steel
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 a lower tempering temperature. For example, a tensile strength of 225 ksi can be achieved by tempering at 316°C (600°F), and tensile strength of 130 ksi can be achieved by tempering at 538°C (1000°F).

Hardening of 4140 Steel
AISI 4140 alloy steel can be hardened by cold working, or heating and quenching.

Machinability of 4140 Steel
AISI 4140 alloy steel has good machinability in the annealed condition.

Forming of 4140 Steel
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 of 4140 Steel
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.





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