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.


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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.


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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.

Applications & Uses of ASTM AISI 4140 Alloy Steel Round Bars

Application / Component Use of 4140 Round Bar
Holder Blocks4140 Round Bar used for Holder Blocks requiring high strength and dimensional stability.
Mold Bases4140 Round Bar used for Mold Bases offering toughness and wear resistance.
Axle Shafts4140 Round Bar used for manufacturing durable and impact-resistant Axle Shafts.
Bolts & Fasteners4140 Round Bar used for high-strength Bolts and Heavy-Duty Fasteners.
Crankshafts4140 Round Bar used for Crankshafts in engines due to superior fatigue strength.
Couplings4140 Round Bar used for Couplings where high tensile strength is required.
Gears & Pinions4140 Round Bar used for Gears, Pinions, and Sprockets in heavy machinery.
Spindles4140 Round Bar used for Machine Spindles and Lathe Spindles offering rigidity and precision.
Piston Rods4140 Round Bar used for Hydraulic Piston Rods and Rams due to toughness and machinability.
Tool Holders4140 Round Bar used for Tool Holders and Fixture Components in machining setups.
Jigs & Fixtures4140 Round Bar used for Jigs and Fixtures requiring high dimensional accuracy.
Guide Rods4140 Round Bar used for Precision Guide Rods and Linear Shafts.
Collets & Chuck Bodies4140 Round Bar used for Chuck Bodies, Collets, and Clamping Components.
Hydraulic Shafts4140 Round Bar used for Hydraulic Shafts & Components under high-pressure conditions.
Logging Parts4140 Round Bar used for Logging & Drilling Equipment due to its impact resistance.
Conveyor Pins & Rolls4140 Round Bar used for Conveyor Pins, Rolls, and Bearing Supports.
Drill Collars & Tool Joints4140 Round Bar used in Oilfield Tools such as Drill Collars and Tool Joints.
Machine Components4140 Round Bar used for Heavy Machine Components and Shafts.
Gear Racks4140 Round Bar used for Gear Racks and Power Transmission Systems.
Forks & Levers4140 Round Bar used for Forks, Levers, and Steering Components.
Motor Shafts4140 Round Bar used for Electric Motor Shafts requiring precise balancing.
Tie Rods4140 Round Bar used for Tie Rods in heavy-duty mechanical linkages.
Camshafts4140 Round Bar used for Camshafts with high surface hardness and strength.
Reamer Bodies4140 Round Bar used for Reamer Bodies and Boring Tools.
Bearing Housings4140 Round Bar used for Bearing Housings and Support Frames.
Axles & Shafting4140 Round Bar used for Axles and Power Transmission Shafting.
Pump Shafts4140 Round Bar used for Pump Shafts and Rotors under fluid pressure.
Lathe Spindles4140 Round Bar used for Lathe Spindles providing stability and smooth rotation.
Die Holders4140 Round Bar used for Die Holders and Press Tool Components.
Brake Dies & Trim Dies4140 Round Bar used for Brake Dies, Trim Dies, and Press Dies.
Tooling Back-Up Plates4140 Round Bar used for Back-Up Plates in Tooling Applications.
Forming & Forging Dies4140 Round Bar used for Forging Dies and Forming Tools requiring toughness.
Hydraulic Press Parts4140 Round Bar used for Hydraulic Press Columns, Rams, and Guides.
Marine Shafts4140 Round Bar used for Marine Propeller Shafts & Deck Equipment.
Aerospace Tooling4140 Round Bar used for Aerospace Fixtures and Assembly Tooling.
Defence Components4140 Round Bar used for Defence Hardware, Launch Tubes & Armament Parts.
Power Plant Equipment4140 Round Bar used for Turbine Shafts and Rotating Components in Power Plants.
Oil & Gas Equipment4140 Round Bar used for Oilfield Equipment, Wellhead Components & Drilling Tools.
Construction Machinery4140 Round Bar used for Excavator Pins, Loader Shafts & Heavy Construction Parts.
Railway Components4140 Round Bar used for Railway Axles, Brackets & Suspension Pins.
Mining Equipment4140 Round Bar used for Mining Shafts, Crusher Pins & Wear Parts.
Windmill Shafts4140 Round Bar used for Wind Turbine Shafts and Mechanical Hubs.

Countries we have exported our products to:

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Cities we have supplied our products to:

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