4140 steel is a chromium, molybdenum, manganese low alloy steel plate that is known for its toughness, high fatigue strength, and high torsional strength.
4140 steel is a low alloy steel plate that is used in many different industries.
4140 steel plate has high fatigue strength, excellent toughness, and good corrosion resistance. One disadvantage to 4140 steel is the extra care that must be taken when welding it.
4140 steel is used in the aerospace, oil and gas, and many other industries.
4140 steel plate is often used for shafts, crankshafts, gears, collars, and machinery parts because of its toughness, abrasion and impact resistance, and high fatigue strength.
4140 steel plate has good machinability in the annealed condition.
4140 steel plate is weldable by all conventional methods but requires preheating beforehand.
4140 is hardened by heating to 1550°F or 845°C followed by quenching in oil.
4140 steel plate has high fatigue strength, excellent toughness, and good corrosion resistance. One disadvantage to 4140 steel is the extra care that must be taken when welding it.
4140 steel is used in the aerospace, oil and gas, and many other industries.
4140 steel plate is often used for shafts, crankshafts, gears, collars, and machinery parts because of its toughness, abrasion and impact resistance, and high fatigue strength.
4140 steel plate has good machinability in the annealed condition.
4140 steel plate is weldable by all conventional methods but requires preheating beforehand.
4140 is hardened by heating to 1550°F or 845°C followed by quenching in oil.
| Temper | Thickness (Metric/Imperial) | ||
|---|---|---|---|
| Width | Length | ||
| 4140 | 3" - 10" | 36" - 96" | 96" - 240" |
| Cr | Mn | C | Si | Mo | S | P | Fe |
|---|---|---|---|---|---|---|---|
| 0.8 - 1.10 | 0.75 - 1.0 | 0.380 - 0.430 | 0.15 - 0.30 | 0.15 - 0.25 | 0.040 | 0.035 | Balance |
| Properties | Metric | Imperial |
|---|---|---|
| Tensile Strength | 655 MPa | 95,000 PSI |
| Yield Strength | 415 MPa | 60,200 PSI |
| Bulk Modulus | 140 GPa | 20,300 KSI |
| Shear Modulus | 80 GPa | 11,600 KSI |
| Elastic Modulus | 190 - 210 GPa | 26,557 - 30,458 KSI |
| Poisson's Ratio | 0.27 - 0.30 | 0.37 - 0.30 |
| Elongation at Break (50mm) | 25.7% | 25.7% |
| Brinell Hardness | 197 | 197 |
| Machinability (set to AISI 1212 as 100 Machinable) | 65 | 65 |
ANSWER:
4140 steel is considered a low alloy or carbon steel. With the addition of chromium and molybdenum, it is one of the most common alloy steels. The chromium boosts corrosion resistance and the molybdenum boosts toughness.
ANSWER:
4140 steel has excellent resistance to corrosion compared to other types of steel because of its higher percentage of chromium and molybdenum. However, once the corrosion process has started, it will rust just like most steel that has undergone the same damage.
ANSWER:
4140 steel can be welded but requires preheating beforehand because it is more crack sensitive.
ANSWER:
The addition of chromium and molybdenum are why 4140 is considered a “chromoly” steel.
ANSWER:
The first “4” is 4140 indicates that the steel contains molybdenum at higher levels than other steels like the 1xxx series.
The “1” in 4140 indicates the addition of chromium at higher levels than 46xx steels.
The “40” differentiates 4140 steel from other 41xx series steels.
ANSWER:
4140 steel is considered a low alloy or carbon steel. With the addition of chromium and molybdenum, it is one of the most common alloy steels. The chromium boosts corrosion resistance and the molybdenum boosts toughness.
ANSWER:
4140 steel has excellent resistance to corrosion compared to other types of steel because of its higher percentage of chromium and molybdenum. However, once the corrosion process has started, it will rust just like most steel that has undergone the same damage.
ANSWER:
4140 steel can be welded but requires preheating beforehand because it is more crack sensitive.
ANSWER:
The addition of chromium and molybdenum are why 4140 is considered a “chromoly” steel.
ANSWER:
The first “4” is 4140 indicates that the steel contains molybdenum at higher levels than other steels like the 1xxx series.
The “1” in 4140 indicates the addition of chromium at higher levels than 46xx steels.
The “40” differentiates 4140 steel from other 41xx series steels.
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