SAE 4140 Steel Supplier in India

SAE 4140 Round Bars, Billets, Flats & Ingots

What is SAE 4140 Steel?

SAE 4140 is a chromium-molybdenum (Cr-Mo) alloy steel renowned for its high strength, toughness, fatigue resistance and excellent hardenability. It is one of the most widely specified engineering steels in North America and is extensively used in automotive, oil & gas, mining, aerospace and heavy engineering industries.

SAE 4140 offers an excellent balance between strength, machinability and wear resistance, making it suitable for components subjected to high mechanical loads and repeated stress. It is commonly supplied in the annealed, normalized, or quenched and tempered condition depending on customer requirements.

SAE 4140 Chemical Composition

Element	Percentage (%)
Carbon (C)	0.38 – 0.43
Silicon (Si)	0.15 – 0.35
Manganese (Mn)	0.75 – 1.00
Chromium (Cr)	0.80 – 1.10
Molybdenum (Mo)	0.15 – 0.25
Sulphur (S)	≤ 0.040
Phosphorus (P)	≤ 0.035

Typical Mechanical Properties (Q&T)

Property	Typical Value
Tensile Strength	850–1100 MPa
Yield Strength	650–900 MPa
Hardness	28–32 HRC (typical)
Density	7.85 g/cm³
Elongation	12–18%

Mechanical properties vary depending on heat treatment, section size and customer specification.

Key Properties of SAE 4140 Steel

High Strength

Develops excellent mechanical properties after quenching and tempering.

Excellent Toughness

Maintains toughness under dynamic and shock loading.

Outstanding Fatigue Resistance

Ideal for rotating shafts, gears and drive components.

Good Wear Resistance

Suitable for engineering components exposed to continuous friction.

Excellent Hardenability

Can achieve uniform hardness even in larger cross-sections.

Good Machinability

Machines well in the annealed condition and is widely used for precision-machined components.

SAE 4140 Heat Treatment

SAE 4140 is highly responsive to heat treatment processes.

Annealing & Normalizing

Improves machinability and refines grain structure before machining operations.

Hardening

Typically hardened by oil quenching after austenitizing.

Tempering

Provides the desired balance of hardness, strength and toughness.

Induction Hardening

Frequently used for shafts, gears and wear surfaces where a hard exterior with a tough core is required.

SAE 4140 for Forging Applications

SAE 4140 is one of the preferred alloy steels for forged components because it offers:

Excellent forgeability
High strength after heat treatment
Consistent mechanical properties
Good machinability
Reliable performance in demanding applications

It is widely used by forging companies manufacturing critical engineering components.

Common Applications

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

SAE 4140 Equivalent Grades

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

Note: While these grades are considered equivalent, exact chemical composition and mechanical property requirements can vary slightly depending on the applicable standard and customer specification.

SAE 4140 vs EN19

For most engineering and forging applications, SAE 4140 and EN19 are considered equivalent materials. Both are chromium-molybdenum alloy steels with similar strength, toughness and hardenability. The main differences lie in the governing standards (SAE/AISI vs. BS 970) and slight variations in chemical composition limits.

SAE 4140 vs EN24

Property	SAE 4140	EN24
Chromium & Moly	Yes	Yes
Nickel	No	Yes
Toughness	High	Very High
Strength	High	Very High
Cost	Lower	Higher

EN24 is generally selected when maximum toughness and impact resistance are required due to its nickel content.

Available Forms at Excellent Steels & Alloys

SAE 4140 Billets

Ideal for:

Open die forgings
Closed die forgings
Automotive forgings
Heavy engineering applications

SAE 4140 Ingots

Supplied for:

Forging units
Rolling mills
Steel processors
Re-melting operations

SAE 4140 Round Bars

Suitable for:

Shafts & Pins
Gear blanks
Precision-machined components
Engineering applications

SAE 4140 Flats

Used in:

Machine building
Tooling
Industrial fabrication
Engineering components

Frequently Asked Questions

What is SAE 4140 steel?

SAE 4140 is a chromium-molybdenum alloy steel known for its high strength, toughness and excellent hardenability. It is commonly used for highly stressed engineering components.

Is SAE 4140 equivalent to EN19?

Yes. SAE 4140 is widely considered equivalent to EN19 (709M40) and 42CrMo4 for most engineering applications, although minor specification differences may exist.

Can SAE 4140 be heat treated?

Yes. SAE 4140 responds exceptionally well to quenching, tempering and induction hardening.

Is SAE 4140 suitable for forging?

Yes. SAE 4140 is one of the most commonly forged alloy steels for automotive, industrial and heavy engineering components.

What forms of SAE 4140 are available?

Excellent Steels & Alloys supplies SAE 4140 in Billets, Ingots, Round Bars, and Flats.

Excellent Steels & Alloys is a trusted supplier of SAE 4140 steel, 42CrMo4 steel and EN19 alloy steel in India. We supply SAE 4140 billets, SAE 4140 ingots, SAE 4140 round bars and SAE 4140 flats to forging units, machine shops, exporters and engineering manufacturers across the country.

Why Buy SAE 4140 from Us?

Consistent material quality
Competitive pricing
Fast dispatch across India
Billets, ingots, round bars and flats
Support for forging units, machine shops, exporters and OEMs
Reliable sourcing for custom requirements

Industries Served

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

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