Carbon | 0.38 - 0.43 |
Chromium | 0.8 - 1.1 |
Iron | Balance |
Manganese | 0.75 - 1 |
Molybdenum | 0.15 - 0.25 |
Phosphorus | 0.035 max |
Silicon | 0.15 - 0.35 |
Sulphur | 0.04 max |
2. Principal Design Features of Alloy steel bar 4140, This is one of the chromium, molybdenum, manganese low alloy steels noted for toughness, good torsional strength and good fatigue strength.
3. Applications of Alloy steel bar 4140,Alloy steel bar 4140 is used in a tremendous variety of applications, too numerous to mention here.
4. Machinability of Alloy steel bar 4140 : Machinability of Alloy steel bar 4140is good in the annealed condition. In the heat treated and quenched condition machining is best limited to finish grinding.
5. Forming of Alloy steel bar 4140 :Alloy steel bar 4140 as with all the low alloy steels forming may be done by conventional methods with the alloy in the annealed condition. Alloy steel bars 4140 have good ductility, but are tougher than plain carbon steel and thus usually require more force, or pressure, for forming.
6. Welding of Alloy steel bar 4140:Wieldable 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.
7. Heat Treatment OF Alloy steel bar 4140This 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.
8. Forging OF Alloy steel bar 4140 may be forged at 2200 F down to 1700 F.
9. Hot Working of OF Alloy steel bar 4140 Hot working, if required, may be done in the range of 1900 F to 1500 F.
10. Cold Working for OF Alloy steel bar 4140
The alloy readily cold works in the annealed condition by conventional methods.
11. Annealing for OF Alloy steel bar 4140
Annealing is done at 1600 F followed by slow furnace cooling.
12. Temperingfor OF Alloy steel bar 4140
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.
13. Hardening for OF Alloy steel bar 4140
Hardens by cold working, or heating and quenching - also see "Heat Treatment" and "Tempering".
14. Physical Data OF Alloy steel bar 4140
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 |
15. Payment for OF Alloy steel bar 4140: We accept 30 percent advance by T/T, the balance 70 percent by T/T or L/C
16. Process of Alloy steel bar 4140: EAF, LF, VD, forged, heat treatment (annealed, normalized, Q and T)
17. Surface OF Alloy steel bar 4140: black surface turned ground
18. Testing Alloy steel bar 4140: ultrasonic test according to SEP 1921-84 3C/c
19. Delivery condition OF Alloy steel bar 4140 : rolled, forged, rough turned, annealed, quenched, and tempered
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