42CrMo4 Alloy Steel Supplier

42CrMo4 Round Bars, Billets, Flats & Ingots

What is 42CrMo4 Steel?

42CrMo4 is a high-strength chromium-molybdenum alloy steel widely used in the automotive, forging, oil & gas, mining and heavy engineering industries. Known for its excellent hardenability, toughness and fatigue resistance, 42CrMo4 is one of the most popular engineering steels for manufacturing highly stressed mechanical components.

42CrMo4 is a quenched and tempered alloy steel containing chromium and molybdenum. It provides an excellent combination of high tensile strength, superior toughness, excellent fatigue resistance, good wear resistance, and outstanding hardenability.

Because of these characteristics, it is extensively used for shafts, gears, crankshafts, bolts and other components subjected to high mechanical loads. In many markets, 42CrMo4 is considered the European equivalent of EN19 and SAE 4140, although minor differences in chemistry and specification requirements may exist. Excellent Steels & Alloys supplies premium-quality 42CrMo4 billets, ingots, round bars and flats for forging, machining and engineering applications across India.

42CrMo4 Chemical Composition

Element	Percentage (%)
Carbon (C)	0.38 – 0.45
Silicon (Si)	≤ 0.40
Manganese (Mn)	0.60 – 0.90
Chromium (Cr)	0.90 – 1.20
Molybdenum (Mo)	0.15 – 0.30
Phosphorus (P)	≤ 0.025
Sulphur (S)	≤ 0.035

Typical Mechanical Properties

Property	Typical Value
Tensile Strength	900–1100 MPa
Yield Strength	700–900 MPa
Hardness	28–32 HRC (typical)
Density	7.85 g/cm³
Elongation	12–16%

Mechanical properties vary depending on heat treatment, section size and customer specification. (Quenched and tempered condition.)

Key Properties of 42CrMo4 Steel

High Mechanical Strength

Excellent performance in highly loaded engineering components.

Superior Hardenability

Can be heat treated throughout large cross-sections.

Excellent Toughness

Maintains impact resistance after heat treatment.

Good Fatigue Resistance

Suitable for rotating shafts and cyclic loading applications.

Good Wear Resistance & Machinability

Ideal for gears and shafts. Machines well in the annealed condition before hardening.

Heat Treatment

42CrMo4 responds exceptionally well to heat treatment.

Annealing

Improves machinability before manufacturing.

Hardening

Typically oil quenched to achieve high strength.

Tempering

Provides an excellent balance of hardness and toughness.

Induction Hardening

Used where high surface wear resistance is required.

42CrMo4 for Forging

42CrMo4 is one of the most commonly forged alloy steels due to:

Excellent forgeability
Uniform heat treatment response
High mechanical strength
Reliable fatigue performance
Excellent machinability

It is widely used for open-die and closed-die forging operations.

Common Applications

• Drive shafts & Transmission shafts
• Gear shafts & Gears
• Axles
• Crankshafts
• Connecting rods
• Hydraulic cylinders
• High-strength bolts & Studs
• Couplings
• Mining equipment
• Oil & gas components
• Forged engineering parts

42CrMo4 Equivalent Grades

Standard	Equivalent Grade
EN	42CrMo4
DIN	42CrMo4
Material Number	1.7225
BS 970	EN19 / 709M40
AISI / SAE	4140
JIS	SCM440

Note: While these grades are widely accepted as equivalents, slight differences in chemical composition and mechanical property limits may exist. Always verify the applicable specification for your project.

42CrMo4 vs EN19

For most engineering applications, 42CrMo4 and EN19 are considered equivalent materials. Both are chromium-molybdenum alloy steels offering high strength, good toughness and excellent hardenability. The primary differences lie in the governing standards and permissible chemical composition ranges.

42CrMo4 vs EN24

Property	42CrMo4	EN24
Nickel	No	Yes
Strength	High	Very High
Toughness	High	Excellent
Fatigue Resistance	High	Excellent
Cost	Lower	Higher

EN24 is generally preferred where maximum toughness and shock resistance are required.

Available Forms at Excellent Steels & Alloys

42CrMo4 Billets

Suitable for:

Open-die forgings
Closed-die forgings
Automotive forgings
Heavy engineering components

42CrMo4 Ingots

Supplied for:

Forging units
Rolling mills
Steel processors
Re-melting operations

42CrMo4 Round Bars

Ideal for:

Shafts
Gear blanks
Pins & Axles
Precision-machined parts

42CrMo4 Flats

Suitable for:

Machine building
Fabrication
Industrial engineering
Tooling applications

Frequently Asked Questions

What is 42CrMo4 steel used for?

42CrMo4 is widely used for shafts, gears, crankshafts, bolts, hydraulic components and other highly stressed engineering parts.

Is 42CrMo4 equivalent to EN19?

Yes. 42CrMo4 is generally regarded as the European equivalent of EN19 (709M40) for most engineering applications.

Can 42CrMo4 be heat treated?

Yes. It responds exceptionally well to quenching, tempering and induction hardening.

Is 42CrMo4 suitable for forging?

Yes. It is one of the most widely used alloy steels for open-die and closed-die forging.

What forms of 42CrMo4 are available?

Excellent Steels & Alloys supplies 42CrMo4 in Billets, Ingots, Round Bars, and Flats.

Excellent Steels & Alloys is a trusted supplier of 42CrMo4 alloy steel for forging, machining and heavy engineering applications. We supply 42CrMo4 billets, 42CrMo4 ingots, 42CrMo4 round bars and 42CrMo4 flats to forging units, machine shops, exporters and OEM manufacturers across India. Our material is suitable for heat treatment, precision machining and high-performance engineering components.

Why Choose Excellent Steels & Alloys?

Consistent material quality
Competitive pricing
Fast dispatch across India
Billets, ingots, round bars and flats
Reliable supply for forging units, machine shops, exporters and OEMs
Custom sizes and quantity options

Industries Served

• Automotive Manufacturing
• Forging Industry
• Oil & Gas
• Mining
• Construction Equipment
• Heavy Engineering
• Agricultural Machinery
• Power Transmission
• Defence Manufacturing

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