Question 1

What is EN19 steel and why is it used for induction hardening?

Accepted Answer

EN19 (British standard 709M40) is a chromium-molybdenum alloy steel equivalent to AISI 4140 and DIN 42CrMo4. Its alloy content gives it significantly deeper hardenability than plain carbon steels — enabling consistent 55–62 HRC hardness even on large cross-sections. It's the standard choice for gearbox shafts, crankshafts, connecting rods, hydraulic cylinder rods, and high-stress automotive components where EN8 isn't strong enough.

Question 2

What hardness and case depth can be achieved on EN19?

Accepted Answer

Induction hardening on EN19 steel achieves 55–62 HRC surface hardness, with case depth from 0.5mm to 4mm depending on your specification and the frequency applied. We use medium to high frequency induction depending on cross-section diameter. Rockwell hardness test reports are issued with every batch.

Question 3

Is EN19 the same as AISI 4140?

Accepted Answer

Yes — EN19 (BS 709M40) and AISI 4140 are equivalent grades, both chromium-molybdenum alloy steels with roughly 0.38–0.45% carbon, 0.9–1.2% chromium, and 0.2–0.35% molybdenum. If your drawing says 4140 or 42CrMo4 (DIN), we treat it the same as EN19 for induction hardening purposes. We accept components described by any of these designations.

Question 4

Do you harden EN19 crankshafts and gearbox shafts?

Accepted Answer

Yes. Crankshaft journals, main and big-end bearing surfaces, gearbox output shafts, and camshaft lobes in EN19/4140 are processed regularly. We use specialised scanning and single-shot coil setups depending on the journal geometry. Components up to 2,000mm length and 300mm diameter are accommodated in-house.

Question 5

Can you process EN19 hydraulic cylinder rods?

Accepted Answer

Yes. Hydraulic cylinder piston rods in EN19 are a common job — typically hardened to 55–60 HRC with a 0.5–1.5mm case depth for chrome plating adhesion and wear resistance. We ensure minimal distortion on long rods (straightness better than 0.1mm per metre) through controlled single-shot induction. Available for Punjab, Haryana, and Delhi NCR manufacturers.

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