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AISI 4140 alloy steel round bar
Alloy steels are designated by AISI four-digit numbers and comprise different kinds of steels, each with a composition which exceeds the limitations of B, C, Mn, Mo, Ni, Si, Cr, and Va set for carbon steels.
AISI 4140 alloy steel is a chromium-, molybdenum-, and manganese-containing low alloy steel. It has high fatigue strength, abrasion and impact resistance, toughness, and torsional strength. The following datasheet gives an overview of AISI 4140 alloy steel.
| Product Name | 4140 alloy steel round bar | ||||||||||||||||
| Length | any size can custom-made | ||||||||||||||||
| Width | any size can custom-made | ||||||||||||||||
| Thickness | any size can custom-made | ||||||||||||||||
| Chemical composition |
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| Standard | AISI,ASTM,DIN,JIS,GB,JIS,SUS,EN,etc. | ||||||||||||||||
| Technique | Hot rolled/forged/cold draw | ||||||||||||||||
| Surface Treatment | clean/black rough/milled/grinding painting etc. | ||||||||||||||||
| Thickness tolerance | ±0.15mm | ||||||||||||||||
| Material | 3Cr2Mo/1.2311/1.2312/P20/1.2738/718H/P20+Ni/1.2316/1.2083/4Cr13 /sus420j2/420/S136/NAK80H13/1.2344/SKD61/5CrNiMo/SKT4/1.2714 Cr12/D3/1.2080/Cr12MoV/D2/1.2379/SKD11/9CrWMn/O1/1.2510/SKS3 /DC53 40Cr/5140/35CrMo/42CrMo/4140/1.7225 C45/C50/1045/1050/S50C/S45C/T10/T8 M2/1.338/SKH51 CUSTOM-MADE | ||||||||||||||||
| MOQ | 1 ton to 25 tons and accept sample order | ||||||||||||||||
| Shipping time | 15-20 days after receiving deposit or L/C | ||||||||||||||||
| Export packing | Standrad export seaworthy package/ wooden box package | ||||||||||||||||
| Capacity | 12000 tons/year |
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.
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.
Below are 4140 alloy steel datasheets including chemical composition, properties and equivalent chart, etc.
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 | – |
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) |
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) | |
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 |
4140 alloy steel is typically normalized at 870 °C (1600°F), and should be cooled at a specified temperature in still air.
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.
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 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.
Material 4140 forging temperature is about 1232 °C (2250 °F).
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.
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 | ||
