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This is one of the chromium, molybdenum, manganese low alloy steels noted for toughness, good torsional strength and good fatigue strength.
Applications
4140 is used in a tremendous variety of applications, too numerous to mention here.
Machinability
Machinability of this alloy is good in the annealed condition. In the heat treated and quenched condition machining is best limited to finish grinding.
Forming
As with all the low alloy steels forming may be done by conventional methods with the alloy in the annealed condition. These alloys have good ductility, but are tougher than plain carbon steel and thus usually require more force, or pressure, for forming.
Welding
Weldable by all of the conventional methods. Note that welding with the alloy in the heat treated condition will affect the mechanical properties and a post weld heat treatment may be needed.
Heat Treatment
This alloy is hardened by heating to 1550 F and quenching in oil. It is best to normalize the alloy by heating at 1675 F for a long enough time to permit thorough heating, followed by air cooling, prior to the hardening treatment.
Forging
4140 may be forged at 2200 F down to 1700 F.
Hot Working
Hot working, if required, may be done in the range of 1900 F to 1500 F.
Cold Working
The alloy readily cold works in the annealed condition by conventional methods.
Annealing
Annealing is done at 1600 F followed by slow furnace cooling.
Aging
Not applicable to this alloy.
Tempering
Tempering temperatures range from 400 F to 1200 F depending upon the hardness level desired. The lower the tempering temperature the greater the hardness of the alloy. For example tempering at 600 F gives a tensile strength of 225 ksi while tempering at 1000 F will give 130 ksi.
Hardening
Hardens by cold working, or heating and quenching - also see "Heat Treatment" and "Tempering".
Physical Data
Density (lb / cu. in.)
0.28
Specific Gravity
7.83
Specific Heat (Btu/lb/Deg F - [32-212 Deg F])
0.114
Melting Point (Deg F)
2580
Thermal Conductivity
23
Mean Coeff Thermal Expansion
7
Modulus of Elasticity Tension
33
Mechanical Data
MSO currently has no data available for this grade.
Disclaimer
This information is provided "as is" and Metal Suppliers Online, LLC makes no warranty of any kind with respect to the subject matter or accuracy of the information contained herein. Metal Suppliers Online, Inc. specifically disclaims all warranties, expressed, implied or otherwise, including without limitation, all warranties of merchantability and fitness for a particular purpose.
In no event shall Metal Suppliers Online, Inc. be liable for any special, incidental, indirect or consequential damages of any kind or any damages whatsoever resulting from loss of use, data, profits, whether or not advised of the possibility of damage, and on any theory of liability, arising out of or in connection with the use of the information contained herein.
This publication may include technical inaccuracies or typographical errors. Changes may be periodically made to the information herein.
