India’s automotive sector has changed dramatically in the last decade. We have seen electrification, lightweighting, automation in machining, tighter tolerances, and higher expectations for durability. Despite all this innovation, two materials have quietly remained irreplaceable:

EN-19 (4140)
EN-24 (817M40)

Ask any crankshaft manufacturer, gearbox maker, axle shop, or precision machining unit these grades continue to dominate because they balance strength, toughness, fatigue resistance, machinability, and cost better than almost any modern alternative.

At Goel Steel Enterprises (GSE), we supply EN-19 and EN-24 every day to the country’s top automotive vendors. And our customers consistently tell us the same thing:

Here’s a clear breakdown of why EN-19 and EN-24 still lead the race and what makes them essential for India’s automotive ecosystem.

Why the Automotive Industry Still Chooses EN-19

EN-19 (also known as 4140) is the definition of a balanced alloy steel.

Key advantages:

• excellent toughness even in larger sections

• strong fatigue resistance (critical for rotating parts)

• reliable hardenability

• stable performance under shock loading

• excellent ratio of performance vs cost

Where EN-19 is used in automotive:

• drive shafts

• axle components

• steering knuckles

• gear shafts

• crank pins

• connecting rods for medium-duty engines

EN-19 survives the automotive world’s biggest threats impact, torsion, fatigue cycles, machining strain, and uneven load conditions.

Why EN-24 Remains the “Premium” Automotive Alloy

If EN-19 is the workhorse, EN-24 is the racehorse.

With higher Nickel content and a more robust alloy balance, EN-24 provides:

• superior toughness

• exceptional shock resistance

• high fatigue life

• uniform hardenability across large diameters

• higher tensile and yield strength

Preferred for:

• heavy-duty crankshafts

• high-performance gear systems

• propeller shafts

• transmission components under extreme load

• impact-resistant automotive parts

For high-stress vehicles commercial, off-road, performance, defence EN-24 is still the gold standard.

EVs, New-Age Vehicles, and Why These Steels Are Becoming More Relevant

Electric vehicles place even higher demands on components:

• instant torque → higher stress on shafts

• reduced NVH → tighter machining tolerances

• weight optimization → stronger materials needed for smaller designs

• higher RPMs → better fatigue resistance

This makes EN-19 and EN-24 even more relevant today.
The automotive sector isn’t moving away from these alloys it’s using them in smarter, more precise ways.

Why Quality Variation in These Grades Can Cost Crores

Automotive suppliers know the pain of:

• shaft failure after machining

• inconsistent heat treatment

• cracks found during magnetic particle testing (post-machining)

• rejection from OEM audits

• premature field failures

These issues often trace back to poor forging quality, chemical imbalance, or internal steel defects.

This is why testing and material consistency matter more today than ever.

How GSE Ensures EN-19 and EN-24 Deliver Every Time

At Goel Steel Enterprises, our focus is simple:
supply steel that behaves exactly the way the customer expects — every single time.

✔ Ultrasonic Testing (UT)

Reveals internal defects not visible externally, such as:

• porosity

• laminations

• centerline segregation

• internal cracks

✔ Backwall Echo Consistency

Especially critical for larger EN-24 and EN-19 sections — reveals density uniformity.

✔ Chemical Composition Verification

We ensure accurate levels of:

• Chromium

• Nickel

• Manganese

• Molybdenum

• Carbon

These elements directly influence:

• hardenability

• fatigue resistance

• strength

• distortion during heat treatment

✔ Mill Traceability and Documentation

Every batch is traceable — essential for automotive audits and PPAP compliance.

Why Automotive Clients Prefer GSE

Our customers repeatedly highlight three reasons:

1. Consistent quality across batches

EN-19 and EN-24 must perform the same way every time — machining programs and heat treat cycles depend on it.

2. Zero surprises during machining

Sound, homogeneous steel ensures tool life, surface finish, and dimensional stability.

The Grades We Supply for Automotive Applications

GSE’s tested material portfolio includes:

• EN-19

• EN-24 (817M40)

• EN-31

• EN-8D

• D2 / D3 (for tooling)

• H13 / DB6 (for forging dies used to make automotive parts)

Browse our full range:
https://www.goelsteelenterprises.com/products

Contact us for requirements:
https://www.goelsteelenterprises.com/contact

New vehicle platforms, EV drivetrains, safety upgrades, and global manufacturing standards all demand predictability and consistency from steel suppliers.

This is why EN-19 and EN-24 continue to lead the race and why GSE places such importance on forging quality, UT testing, backwall echo analysis, and chemical verification.

Because in a world where one component failure can bring an entire line to a stop, materials must be trusted, not assumed.

At GSE, that trust is our biggest product.