AISI 4140 alloy steel round bar, steel flat bar, plate supplier. AISI 4140 alloy steel is chromium, molybdenum, manganese containing low alloy steel. 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. It has high fatigue strength, abrasion and impact resistance, toughness, and torsional strength.
AISI/SAE 4140 grade is a versatile alloy with good atmospheric corrosion resistance and reasonable strength. It shows good overall combinations of strength, toughness, wear resistance and fatigue strength.
AISI 4140 Alloy Steel Form of Supply
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 steel.
AISI 4140 Alloy Steel, we can supply the round bar, steel flat bar, plate, hexagonal steel bar, and steel square block. steel Round bar can be sawn to your required lengths as one offs or multiple cut pieces. 42CrMo4 alloy steel Rectangular pieces can be sawn from flat bar or plate to your specific sizes. Ground tool steel bar can be supplied, providing a quality precision finished bar to tight tolerances.
Chemical Properties
The table below highlights the chemical composition of AISI 4140:
| C(％) | 0.38～0.25 | Si(％) | ≤0.40 | Mn(％) | 0.60～0.90 | P(％) | ≤0.035 |
| S(％) | ≤0.035 | Cr(％) | 0.90～1.20 | Mo(%) | 0.15～0.30 |
The addition of chromium and molybdenum promotes corrosion resistance. The molybdenum can be particularly useful when trying to resist corrosion due to chlorides. The manganese in AISI 4140 is used to increase hardenability and as a deoxidizer. In alloy steels, manganese can also combine with sulfur to improve machinability and make the carburizing process more effective.
Equivalent Of 4140 alloy Structure Steel
| USA | Germany | China | Japan | France | England | Italy | Poland | ISO | Austria | Sweden | Spain |
| ASTM/AISI/UNS/SAE | DIN, WNr | GB | JIS | AFNOR | BS | UNI | PN | ISO | ONORM | SS | UNE |
| 4140 / G41400 | 42CrMo4 / 1.7225 | 42CrMo | SCM440 | 42CD4 | 708M40 | 42CrMo4 | 2244 |
Heat Treatment
AISI 4140 alloy steel is heated at 845°C (1550°F) followed by quenching in oil. Before hardening, it can be normalized by heating at 913°C (1675°F) for a long period of time followed by air cooling.
Forging
Forging of this steel should be carried out between 2200 and 1650 º F (1200 and 900 º C). The lower the finishing temperature from forging, the finer will be the grain size. This alloy should ideally not be forged below 1650 º F (900 º C) and should be slow cooled after forging.
Hot Working
AISI 4140 alloy steel can be hot worked at 816 to 1038°C (1500 to 1900°F)
Annealing
AISI 4140 alloy steel is annealed at 872°C (1600°F) followed by slowly cooling in the furnace.
Tempering
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, the tensile strength of 225 ksi cab 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
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.
Contact
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