SAE AMS2759-13-2018 PDF

Full title and description

St SAE AMS2759-13-2018 — AMS2759/13: Gaseous Nitrocarburizing. Material specification that defines engineering, process and quality requirements for producing a continuous thin epsilon (ε) iron‑carbonitride compound layer (commonly called a "white layer") on steel parts by a low‑temperature, carbon‑enriched gaseous nitriding process.

Abstract

This AMS material specification covers the requirements for gaseous nitrocarburizing intended to produce a continuous compound (white) layer on ferrous parts using a low‑temperature, carbon‑enriched nitriding atmosphere. It addresses process description, technical requirements, quality assurance, preparation for delivery, and rejection criteria for the treated parts.

General information

• Status: Superseded (originally issued June 11, 2018; later revised and reissued as AMS2759/13A on April 14, 2025).
• Publication date: June 11, 2018 (AMS2759/13).
• Publisher: SAE International (SAE Mobilus / AMS product family).
• ICS / categories: Metallurgy — Iron and steel products; heat treatment and surface treatments (ICS 77.140; relevant subcategories 77.140.10 Heat‑treatable steels and 77.140.20 Stainless steels).
• Edition / version: AMS2759/13 (2018).
• Number of pages: 7 (2018 version).

Scope

The specification applies to gaseous, low‑temperature, carbon‑enriched nitrocarburizing processes that produce a continuous thin ε‑iron‑carbonitride compound zone on steel parts. It defines acceptable process conditions, compound layer expectations, inspection/testing requirements and documentation needed for delivery. When automated control of the compound layer is required, related AMS documents (for example the automated control variant) are referenced by the AMS2759 sub‑family.

Key topics and requirements

• Definition of the compound (white) layer: composition, expected continuity and allowable porosity.
• Process parameters: low‑temperature range, gas atmosphere composition (carbon and nitrogen potentials), cycle control and dwell times.
• Surface preparation and cleanliness requirements prior to nitrocarburizing.
• Inspection and testing: visual inspection, microstructure examination, compound layer thickness measurement, surface hardness, and adherence tests.
• Quality assurance: process control, records, traceability, and acceptance/rejection criteria.
• Preparation for delivery: marking, packing, and documentation requirements for treated parts.

Typical use and users

Used by aerospace and high‑performance fastener manufacturers, heat‑treat service providers, metallurgical engineers, procurement/specification engineers, quality/inspection personnel and OEMs requiring improved wear, fatigue and corrosion resistance via nitrocarburized surfaces on steel components.

Related standards

Part of the AMS2759 family of heat‑treatment and surface‑treatment material specifications (general AMS2759 requirements and multiple subparts for specific processes such as ion nitriding, automated gaseous nitrocarburizing, etc.). The 2018 AMS2759/13 was later revised as AMS2759/13A (April 14, 2025). Other related AMS documents (AMS2759 series subparts) and international standards on nitriding steels (for example ISO/EN nitriding/nitrocarburizing and ISO 683 series for nitriding steels) are commonly referenced for material and process compatibility.

Keywords

AMS2759/13, gaseous nitrocarburizing, nitrocarburizing, nitrocarbide, white layer, epsilon iron carbonitride, surface hardening, low‑temperature nitriding, metal finishing, SAE International, heat treatment of steel parts.

FAQ

Q: What is this standard?

A: AMS2759/13 (2018) is an SAE (AMS) material specification that defines requirements for gaseous nitrocarburizing processes used to produce a thin epsilon iron‑carbonitride compound layer on steel parts for improved surface properties.

Q: What does it cover?

A: It covers the process description, technical and quality requirements, inspection and testing methods, preparation for delivery, and acceptance/rejection criteria for parts treated by gaseous, carbon‑enriched, low‑temperature nitrocarburizing.

Q: Who typically uses it?

A: Aerospace OEMs and suppliers, heat‑treating job shops, fastener and component manufacturers, metallurgical engineers, quality inspectors and procurement/specification teams who require controlled nitrocarburizing for performance and traceability.

Q: Is it current or superseded?

A: The AMS2759/13 document issued June 11, 2018 has been superseded by a revised edition AMS2759/13A issued April 14, 2025. For current requirements refer to the latest AMS2759/13A revision or the issuing body (SAE) listings for the up‑to‑date text and any amendment history.

Q: Is it part of a series?

A: Yes — AMS2759 is a family of material specifications covering heat treatment and surface treatment of steel parts. AMS2759/13 is one subpart focused on gaseous nitrocarburizing; other subparts cover ion nitriding, automated gaseous processes, hydrogen embrittlement relief, and general heat‑treatment requirements.

Q: What are the key keywords?

A: Nitrocarburizing, gaseous nitrocarburizing, white layer, epsilon iron‑carbonitride, AMS2759/13, surface hardening, SAE material specification, heat treatment, metal finishing.