SAE ARP4715A-2018 PDF

Full title and description

SAE ARP4715A (2018) — Induction Hardening of Steel Components. Recommended Practice providing guidance to establish and control induction hardening processes for plain carbon and alloy steel components, including process selection, pre‑ and post‑heat treatments, process controls, inspection and documentation intended for design, production and procurement use.

Abstract

This recommended practice describes requirements and recommended practices for induction hardening of selected areas of steel components. It covers required process steps, material and prior‑heat considerations, hardening and quench practices, tempering, acceptance criteria (hardness and case/depth control), process documentation and auditor/purchase specification guidance for consistent, repeatable induction hardening results.

General information

• Status: Stabilized / Active recommended practice.
• Publication date: April 3, 2018 (ARP4715A revision).
• Publisher: SAE International.
• ICS / categories: 25.200 (Heat treatment); related metallurgy/ferrous metals categories.
• Edition / version: ARP4715A (2018 revision).
• Number of pages: 10 pages (approximate, published standard document length).

Scope

Covers establishment of induction hardening processes for plain carbon and alloy steel components where localized surface hardening is required. Topics include material considerations (including when a prior heat treatment should be used), induction heating parameters, quench and tempering recommendations, acceptance criteria (surface hardness, case depth), process control and qualification, inspection and nondestructive testing, and recommendations for specifying induction hardening in purchase documents and process sheets. The document is intended as guidance for designers, process auditors, heat‑treat suppliers and procurement.

Key topics and requirements

• Overview of suitable steels and when to require prior bulk heat treatment (and reference to applicable prior‑heat practices).
• Selection of induction heating parameters and equipment setup for controlled case formation.
• Quench methods and control to achieve targeted microstructure and hardness.
• Tempering recommendations to balance hardness and toughness.
• Acceptance criteria: surface hardness, effective case depth, and sampling/test methods.
• Process documentation, process qualification, and auditor/purchase specification guidance.
• Inspection and nondestructive testing best practices for hardened components.

Typical use and users

Used by heat‑treat process engineers, metallurgists, design engineers specifying surface‑hardness requirements, quality and inspection teams, procurement personnel writing supplier specifications, and process auditors qualifying induction hardening facilities. Typical industries include aerospace, automotive, heavy equipment and any sector requiring localized hardening of steel parts.

Related standards

Commonly referenced documents include AMS 2759 (recommended for prior heat treatment where applicable), standards addressing furnace and pyrometry control (e.g., AMS 2750 family), and international heat‑treatment vocabularies and quality standards (for example ISO/EN heat‑treatment vocabulary and quality standards). These provide complementary requirements for prior heat treatment, temperature control and terminology.

Keywords

induction hardening, case hardening, steel, heat treatment, quench, tempering, case depth, surface hardness, process control, process specification, SAE ARP4715A

FAQ

Q: What is this standard?

A: SAE ARP4715A is a Recommended Practice titled "Induction Hardening of Steel Components" that provides guidance for establishing and controlling induction hardening processes for steel parts.

Q: What does it cover?

A: It covers selection of steels and pre‑heat treatment considerations, induction heating parameters, quench and tempering practices, acceptance criteria (hardness and case depth), inspection and documentation, and guidance for purchase specifications and audits.

Q: Who typically uses it?

A: Heat‑treat engineers and technicians, metallurgists, design engineers specifying surface properties, quality/inspection teams, procurement specialists and process auditors—especially in aerospace, automotive and heavy‑equipment sectors.

Q: Is it current or superseded?

A: ARP4715A is the 2018 revision (ARP4715A) and is listed as a stabilized SAE recommended practice as published April 3, 2018; users should check SAE International for any later revisions or reaffirmations before relying on it for regulatory or contract work.

Q: Is it part of a series?

A: It is an SAE Aerospace Recommended Practice in the ARP4715 series (the A suffix denotes the 2018 revision). It is typically used alongside other SAE/AMS documents that address heat‑treatment procedures, pyrometry and quality control.

Q: What are the key keywords?

A: Induction hardening, case depth, surface hardness, steel heat treatment, quench, temper, process qualification, SAE ARP4715A.