AISI 4140 Alloy Bar
AISI 4140 alloy bar is a chromium-, molybdenum-, and manganese-containing low alloy steel. It has high fatigue strength, abrasion and impact resistance, toughness, and torsional strength. Generally supplied hardened and tempered in the tensile range of 850 – 1000 MPa.
Heat Treatment
Hardened at 850°C followed by water quenching. Tempering at min. 650°C, cooled in air.
Chemical Composition
|
Element |
Content (%) |
|
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 |
|
Iron, Fe |
Balance |
Physical Properties
|
Properties |
Metric |
Imperial |
|
Density |
7.85 g/cm3 |
0.284 lb/in³ |
|
Melting point |
1416°C |
2580°F |
Mechanical Properties
|
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 |
Hot Working
AISI 4140 alloy bar can be hot worked at 816 to 1038°C (1500 to 1900°F).
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 bar 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
AISI 4140 alloy steel can be hardened by cold working, or heating and quenching.
Application
AISI 4140 modified is a low alloy hardened and tempered steel suitable for the manufacture of oil and gas downhole tools used in production and completion processes. General Engineering applications include construction components exposed to heavy strain, such as shafts, gear, bolts etc. AISI 4140 can also be used in hardened condition as machine parts exposed to heavy wear.
Manufacturing Process
Main Applications
Packaging & Shipping
FAQS
If you have any other questions, please contact me!
Q: Can you produce nickel alloy bars?
A: Yes, we can produce nickel alloy bars according to your requirements.
Q: What is your minimum order quantity?
A: Our minimum order quantity is 50 kg. Larger quantity, lower price.
Q: How long is your delivery time?
A: Generally delivery time for stock is 3 days, and customization takes 15 working days or more, but it is also affected by your specific requirements or order quantity.
Q: Can you provide samples?
A: For small parts, we can provide free sample of regular sizes, but the shipping costs will be borne by you. For large parts sample, we will include it in the order amount. Please confirm with our sales department for your specific requirements.
Q: How can l quickly get the price list?
A: Directly send us email with detailed specification, and you will get the official price list in 1 hour.
Q: How do you control product quality?
A: From the selection of raw materials to transportation packaging, every production process will be testing and evaluated. Only products that have passed all tests can be delivered for export.
Q: Can you provide processing services?
A: Yes, we also provide processing services to our customers. It is one of our goals to provide specialized services such as bending, water cutting, laser cutting, digging holes, welding, slitting of coils, and other fabrications according to the drawings.
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