Engineering & Quality 7 min read · Published by RRE International Metallurgy & Quality Lab on 2026-08-05

A deep dive into steel grades, case depth, core ductility, and why cheap through-hardened pivot pins fail under heavy slew forces.

1. The Anatomy of Pivot Pin Failure

Under heavy backhoe excavation, pivot pins endure alternating bending fatigue and extreme shearing forces. Pins that are through-hardened become brittle and snap, while untreated pins wear out within weeks.

2. Why RRE Uses Controlled Induction Case Hardening

We forge our pins from EN9, EN18 and EN19 alloy steels. Using high-frequency induction furnaces, we achieve a rock-hard outer case (58–62 HRC to 3.0mm depth) while preserving a ductile, shock-absorbing inner core (30–35 HRC).

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