Alloy Steel 42CrMo4 Bars

Alloy Steel 42CrMo4 Bars are premium chromium-molybdenum alloy steel products known for their superior combination of strength, toughness, and wear resistance. Adhering to the DIN EN 10083‑3 standard (also known as DIN 1.7225), this grade offers excellent hardenability and impact resistance with minimal tempering embrittlement. It's widely used in demanding applications such as large gears, heavy-duty shafts, connecting rods, and components for oil drilling equipment.

Chemically, Alloy Steel 42CrMo4 Bars typically consist of 0.38–0.45% carbon, 0.60–0.90% manganese, up to 0.40% silicon, 0.90–1.20% chromium, and 0.15–0.30% molybdenum. Phosphorus and sulfur impurities are controlled to very low levels to maintain toughness .Lion MetalMachine MFGmetinvestholding.comsteeltube.co.inwixsteel.com Furthermore, the density is around 7.83–7.85 g/cm³, with physical traits such as a thermal expansion coefficient (~11–12 ×10⁻⁶ K⁻¹) and moderate thermal conductivity, making it suitable under diverse thermal conditions.


In its quenched and tempered condition, 42CrMo4 exhibits robust mechanical properties. Yield strength ranges from approximately ≥900 MPa (for small diameters) down to ≥500–650 MPa for larger sizes; tensile strength typically spans 900–1200 MPa; elongation remains over 10–14%; and hardness can reach 35–48 HRC (or ~295–355 HB depending on form and dimensions.

Material Specification Chart of 4140 / EN19 / 42crmo4 Round Bar

Specifications ASTM A182, ASME SA182
Standards EN, DIN, JIS, ASTM, BS, ASME, AISI
Range of Diameter 5mm to 500mm
Finish Bright, Black, Forged, Turned Bright
Length 1000 mm Long To 6000 mm Long
Form Round, Billet, Ingot, Forging Etc.

SAE 4140/ EN19 / 42crmo4 Round Bars Grade

Country names India USA German British Japan China Australia
Country standards UNS AISI ASTM A29 DIN 17200 BS 970 JIS G4105 GB/T 3077 AS 1444
Grades G41400 4140 4140 1.7225/ 42CrMo4 EN 19 / 42CrMo4 SCM440 42CrMo 4140

Across sizes, these bars maintain excellent impact toughness (≥35 J, Charpy-V at room temperature) waldunsteel.comastmsteel.com When processed via flame or induction hardening, surface hardness can exceed 53 HRC Fuhong SteelWorld Material providing outstanding surface wear resistance.



Physically, the material has a density around 7.83–7.85 g/cm³, with modulus of elasticity near 210 GPa Virgametwaldunsteel.comThermal expansion (~12 µm/m·°C) and conductivity (~46 W/m·K)—plus electrical resistivity and specific heat capacity—make it stable under varying thermal conditions.


Alloy Steel 4140 / EN19 / 42crmo4 Round Bars Dimensions Standard

Diameter or
Width
(mm)		 Weight per meter Sectional Area Perimeter
Round
(kg)		 Round
(cm²)		 Round
(cm)
5.0 0.15 0.20 1.57
5.5 0.19 0.24 1.78
6.0 0.22 0.28 1.88
7.0 0.30 0.38 2.20
8.0 0.39 0.50 2.51
9.0 0.50 0.64 2.83
10 0.63 0.79 3.14
11 0.75 0.95 3.46
12 0.89 1.13 3.77
14 1.21 1.54 4.40
16 1.58 2.01 5.03
18 2.00 2.54 5.65
20 2.47 3.14 6.28
22 2.98 3.80 6.91
25 3.85 4.91 7.85
28 4.83 6.16 8.80
32 6.31 8.04 10.05
36 7.99 10.18 11.31
40 9.86 12.57 12.57
45 12.49 15.90 14.14
50 15.41 19.64 15.71
56 19.34 24.63 17.59
63 24.47 31.17 19.79
71 31.08 39.59 22.31
80 39.46 50.27 25.13

Frequently Asked Questions about Alloy Steel 42CrMo4 Bars

1. What is Alloy Steel 42CrMo4?

Alloy Steel 42CrMo4 is a chromium-molybdenum alloy steel known for its high tensile strength, good hardenability, and excellent wear resistance. It conforms to DIN 1.7225 and is equivalent to AISI 4140.

2. What are the mechanical properties of 42CrMo4 Bars?

Quenched and tempered 42CrMo4 bars offer tensile strength between 900–1200 MPa, yield strength ranging from 500–900 MPa (depending on size), elongation of 10–14%, and a hardness of up to 48 HRC.

3. Can 42CrMo4 bars be welded?

Welding is possible but requires precautions. Preheating the material to 200–300°C and performing post-weld heat treatment are necessary to avoid cracking due to the high hardenability of the alloy.

4. What are the common applications of Alloy Steel 42CrMo4 Bars?

These bars are widely used in automotive, aerospace, oil & gas, and heavy machinery industries for components like shafts, gears, axles, crankshafts, and tooling parts due to their strength and wear resistance.

Application of AISI Alloy Steel 4140 / EN19 / 42crmo4 Round Bars

ASTM alloy 4140 steel bar, flat or plate material can be used for as wide variety of applications where greater toughness and wear resistance is needed over lower carbon grades. Typical applications for 4140 tool steel uses include Components, Adapters, Arbors,strippers, holder blocks, mold bases, ejectors, back up and support tooling, fixtures, jigs, molds, cams, drill collars, Axle Shafts, Bolts, Crankshafts,stubs, couplings, reamer bodies, axles, shafting, piston rods, rams, hydraulic machinery shafts, gears, sprockets, gear racks, chain links, spindles, tool bodies, tool holders, tie rods, Connection Rods, Chuck Bodies, Collets, Conveyor Pins & Rolls, Ejector Pins, Forks, Gears, Guide Rods, Hydraulic Shafts & Parts,Lathe Spindles, Logging Parts, Milling Spindles, Motor Shafts, Nuts, Pinch Bars, Pinions, Pump Shafts,boring bars,tracks, slides, wear strips or parts, forming dies, brake dies, trim dies, bolsters, machinery parts and components, etc.

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