ASTM AISI 4140 JIS SCM440 DIN 42CrMo4 DIN1.7225 Alloy Steel Plate
Size 4' x 8' x 50 mm
SAE AISI 4140 Alloy Steel
SAE 4140 (AISI 4140 steel) is a Cr-Mo series (Chrome molybdenum
series) low alloy steel, the material has high strength and
hardenability, good toughness, small deformation during quenching,
high creep strength and long-lasting strength at high temperature.
4140 Steel Uses
AISI SAE 4140 alloy steel can be made into round steel bar, flat &
square steel bar, steel plate, steel tube, and has many uses in the
aerospace, oil and gas and automotive industries, typical uses are
thin-walled pressure vessels, forged gears and shafts (Motor
shafts, pump shafts, hydraulic shafts, etc.), spindles (lathe
spindles, milling spindles, etc.), collars, clamps, high strength
bolts, valve bonnet, screws, nuts, worms, collets, torsion bars and
various carburized parts.
Datasheet & Specification
Below are 4140 alloy steel datasheets including chemical
composition, properties and equivalent chart, etc.
AISI SAE 4140 Chemical Composition
The table below lists AISI 4140 chemical composition.
| AISI SAE 4140 Chemical Composition (%) |
| Steel (UNS) | C | Si | Mn | P (≤) | S (≤) | Cr | Mo | Ni |
| 4140 (G41400) | 0.38-0.43 | 0.15-0.35 | 0.75-1.00 | 0.035 | 0.040 | 0.80-1.10 | 0.15-0.25 | – |
AISI 4140 Steel Mechanical Properties
Material 4140 mechanical properties are given in the table below.
| Steel | Tensile strength, Mpa (ksi) | Yield strength, Mpa (ksi) | Elongation in 50 mm (2 in), % | Reduction in area, % | Hardness (HB) | Sample diameter | Conditions |
| AISI 4140 | 1020 (148) | 655 (95) | 17.7 | 46.8 | 302 | 25.4mm (1 in.) | Normalized at 870 °C (1600 °F) |
| 655 (95) | 414 (60) | 25.7 | 56.9 | 197 | Annealed at 815 °C (1500 °F) |
| 1075 (156) | 986 (143) | 15.5 | 56.9 | 311 | Water quenched from 845 °C (1550 °F) and tempered at 540 °C (1000
°F) |
SAE 4140 Physical Properties
Notes: 10-6/K = 10-6.K-1 = (µm/m)/°C
| Material 4140 coefficients of linear thermal expansion |
| Temperature, °C (°F) | Value (10-6/K) | Treatment or condition |
| 20-100 (68-212) | 12.2 | Oil hardened, tempered |
| 20-200 (68-392) | 12.6 |
| 20-400 (68-752) | 13.6 |
| 20-600 (68-1112) | 14.5 |
| 4140 thermal conductivity |
| Value (W/m·K) | Temperature, °C (°F) | Treatment or condition |
| 42.7 | 100 (212) | Hardened &
tempered |
| 42.3 | 200 (392) |
| 37.7 | 400 (752) |
| 33.1 | 600 (1112) |
| AISI / SAE 4140 Specific Heat |
| Value (J/Kg·K) | Temperature, °C (°F) | Treatment or condition |
| 473 | 20-200 (68-392) | Hardened &
tempered |
| 519 | 20-400 (68-752) |
| 561 | 20-600 (68-1112) |
| Mateiral 4140 Electrical Resistivity |
| Value (μΩ· m) | Temperature, °C (°F) | Treatment or condition |
| 0.22 | 20 (68) | Hardened &
tempered |
| 0.26 | 100 (212) |
| 0.33 | 200 (392) |
| 0.48 | 400 (752) |
| 0.65 | 600 (1112) |
Material 4140 Steel Heat Treatment
The following table shows AISI 4140 steel heat treatment, Rockwell
hardness.
| Material 4140 Heat Treat | Temperature, °C (°F) | 4140 steel hardness | Cooling/Agent |
| Normalizing | 870 (1600) | 302 HB | Air |
| Annealing | 790-845 (1455-1555) | 197 HB | Furnace cooling |
| Quenching | 830-845 (1525-1555) | | Oil |
| Tempering (2 hour) | 205 (400) | 58 HRC | Oil hardening |
| 260 (500) | 54 HRC |
| 315 (600) | 50 HRC |
| 370 (700) | 47 HRC |
| 425 (800) | 45 HRC |
| 480 (900) | 40 HRC |
| 540 (1000) | 35 HRC |
| 595 (1100) | 33 HRC |
| 650 (1200) | 28 HRC |
Normalizing
4140 alloy steel is typically normalized at 870 °C (1600°F), and
should be cooled at a specified temperature in still air.
Spheroidizing Annealing
For spheroidizing annealing of 4140 alloy steel, it needs heat
treated to 749 °C (1380 °F), followed by slowly cooling to 666 °C
(1230 °F) at a rate of 6 °C (10 °F)/hour, or rapid cooling to 675
°C (1250 °F) for isothermal annealing.
Full Annealing
Heat treatment to 845 °C (1555 °F), slow cooling from 755 °C (1390
°F) at a rate of 14 °C (25 °F)/hour to 665 °C (1230 °F), or rapid
cooling to 675 °C (1250 °F) for 5 hours isothermal annealing.
Tempering
Tempering temperature of 4140 alloy steel can be from 204-649 °C
(400-1200°F) after normalizing and oil quenching, and the
corresponding Rockwell hardness can be obtained.
Forging
Material 4140 forging temperature is about 1232 °C (2250 °F).
Welding of 4140 Steel
All common arc welding processes, such as (SAW, SMAW, FCAW, GMAW,
GTAW) can be used to weld 4140 alloy steel, but in order to prevent
cracking, it must be preheated to 170-350 °C (350-650 °F) before
welding, preheating interpass temperature depends on the section
thickness of the steel.
Equivalent Material
AISI 4140 equivalent material is listed in the table below.
| AISI 4140 Equivalent Material |
| USA | European Union | China | Japan | ISO |
| Standard | Grade (UNS) | Standard | Grade (Steel Number) | Standard | Grade | Standard | Grade | Standard | Grade |
AISI SAE;
ASTM A29/A29M | 4140 (G41400) | EN 10083-3 | 42CrMo4 (1.7225) | GB/T 3077 | 42CrMo | JISG 4105 | SCM440 | |
