Induction Hardening
Engineering definition, metallurgical mechanisms, standard testing specifications, and manufacturing guidelines for closed-die forgings up to 50 kg.
Quick AnswerFeatured
A rapid surface hardening process where electromagnetic induction heats the outer layer of medium-carbon steel parts above transformation temperature, followed by immediate quench spray.
Technical Explanation & Metallurgical Principles
High-frequency alternating electric current flows through an induction coil surrounding the forged part. Eddy currents heat the surface layer to austenitizing temperature in a matter of seconds. An integrated water or polymer spray jacket immediately quenches the surface, creating a hard martensitic case (54–60 HRC) while the core remains untouched and ductile.
Key Engineering Specifications & Parameters
| Technical Parameter / Metric | Engineering Benchmark / Value |
|---|---|
| Frequency | 10 kHz to 450 kHz (higher frequency = shallower case) |
| Case Depth | 1.0mm to 5.0mm |
| Distortion | Extremely low compared to furnace through-hardening |
Application at Jayesh Forge (Rajkot Plant)
Applied to AISI 1045 and 4140 forged drive shafts, gear teeth, and wear sleeves strictly up to 50 kg.
Related Materials, Standards & Products
Engineered Product Lines
Related Metallurgical & Testing Terms
Case Hardening (Carburizing)
A thermochemical surface hardening treatment that diffuses carbon into the solid surface of low-carbon steel parts at high temperature, followed by quenching.
Quenching and Tempering (Q&T / Hardening)
A two-stage thermal strengthening process: rapid liquid cooling from austenitizing temperature to form martensite, followed by reheating to restore toughness.
Questions Regarding Induction Hardening
Its 0.45% carbon content is sufficient to produce 55–58 HRC surface hardness upon quenching without requiring thermochemical carburizing cycles.
Request a Forging Quote with Induction Hardening Compliance
Our Rajkot metallurgy desk is ready to review your technical drawings, testing protocols, and delivery schedules for custom closed-die forgings strictly up to 50 kg.