EN19 Steel Induction Hardening Hardening
Precision induction hardening for EN19 (709M40 / AISI 4140) chromium-molybdenum alloy steel — gearbox shafts, crankshafts, camshafts & hydraulic cylinder rods. 55–62 HRC. Certified reports.
55–62 HRC. Alloy Steel. No Compromise.
Looking for reliable EN19 steel hardening job work? EN19 is a chromium-molybdenum alloy steel (equivalent to AISI 4140 / 709M40) used wherever engineers need superior hardenability and strength — gearbox shafts, crankshafts, connecting rods, hydraulic cylinder rods and high-torque couplings. Thakur Industries provides precision induction hardening for EN19 steel, achieving 55–62 HRC on the surface layer with a 1–3 mm case depth while retaining excellent through-section toughness. Critical aerospace, automotive and heavy-engineering applications processed daily across Punjab, Haryana and Delhi NCR.
EN19 Applications
EN19’s chromium and molybdenum content gives it much deeper hardenability than plain carbon EN8 steel — the hardened zone penetrates evenly even on large-diameter sections. We process EN19 gearbox shafts, hydraulic cylinder rods, crankshaft journals, cam lobes and high-torque drive shafts across Punjab, Haryana and Delhi NCR.
// SPECIFICATIONS //
EN19 Hardening Specifications
| Grade Designations | EN19 · 709M40 · AISI 4140 · DIN 42CrMo4 |
|---|---|
| Steel Family | Chromium-molybdenum (Cr-Mo) alloy steel |
| Typical Composition | 0.38–0.45% C · 0.9–1.2% Cr · 0.2–0.35% Mo |
| Surface Hardness | 55–62 HRC (controlled to spec) |
| Case Depth | 1–3 mm typical (up to 4 mm on demand) |
| Max Component Size (in-house) | Up to 2,000 mm length · 300 mm diameter |
| Heating Method | Medium / high frequency induction |
| Quench Medium | Polymer / water-based, controlled |
| Straightness (long rods) | Better than 0.1 mm per metre |
| Turnaround | 2–4 working days (standard) |
| Testing | Rockwell HRC verification, case-depth check, dimensional inspection |
// HRC RANGE //
EN19 Induction Hardening HRC Range
The EN19 induction hardening HRC range reflects its chromium-molybdenum alloy chemistry. EN19 (709M40 / 4140) reaches 55–62 HRC at the surface with deep, even hardenability — the table below summarises the hardness, case depth, alloy content and austenitizing temperature for your specification.
| Property | Value |
|---|---|
| Surface Hardness | 55–62 HRC |
| Core Hardness | 28–38 HRC (hardened & tempered) |
| Case Depth | 1–3 mm (up to 4 mm to spec) |
| Alloy Content | 0.38–0.45% C · 0.9–1.2% Cr · 0.2–0.35% Mo |
| Austenitizing Temp | 840–880 °C |
Technical Targets
Hardness Range
HRC 55–62 on the EN19 surface for maximum wear resistance, tuned to the 4140-equivalent spec.
Case Depth
Precise control from 1 mm up to 4 mm, supporting load while keeping the core tough and ductile.
Deep Hardenability
Cr-Mo chemistry delivers consistent HRC even on large-diameter sections — unlike plain carbon steels.
Distortion Control
Selective single-shot and scanning coils minimise warping on long shafts and rods.
Certified Reports
Rockwell hardness and case-depth documentation issued with every batch for OEM traceability.
// PRICING & TURNAROUND //
EN19 Hardening Rates & Lead Time
We offer competitive EN19 steel hardening job work rates for both prototype batches and bulk OEM production. Final pricing depends on component weight, hardened length, case depth and quantity — share your drawing for an exact quote within 24 hours.
Pricing Basis
Per kg or per piece, with reduced rates on bulk and repeat OEM orders.
Minimum Order
No rigid minimum — single trial parts to multi-thousand-piece lots accepted.
Turnaround
Standard 2–4 working days; urgent same-week jobs for regular clients.
// WHY CHOOSE US //
Why OEMs Trust Thakur Industries
Consistent 55–62 HRC
Repeatable hardness on every EN19 / 4140 part, batch after batch.
4140-Equivalent Spec
Documented, traceable hardening for OEM and export supply chains.
Years of Experience
Serving Ludhiana’s automotive, tractor and hydraulic manufacturers.
Fast Turnaround
2–4 day standard delivery keeps your production line running.
Related Material Grades
We induction-harden the full range of automotive and industrial steels. Explore our dedicated material-grade pages for hardness, case depth and application detail:
Related Services
EN19 Steel Hardening FAQs
Learn more about the metallurgy of EN19 / 4140 surface hardening from the ASM International heat-treatment resources.
Last updated: June 2026 · Thakur Industries, Ludhiana, Punjab
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