AGMA 923-B05:2005 Edition

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Metallurgical Specifications for Steel Gearing

Published By	Publication Date	Number of Pages
AGMA	2005	38

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Description

SCOPE

This information sheet recommends steel material and metallurgical quality characteristics for use in conjunction with AGMA gear rating standards. This information sheet identifies specifications and requirements for various metallurgical quality grades for through hardened, carburize and hardened, induction and flame hardened, and nitrided gearing. Characteristics covered include raw material, heat treatment and post heat treat processing, and their associated inspections. Topics related to gear design and rating, such as case depth, stress numbers, and quality control sampling plans are not included in this document.

FOREWORD

[The foreword, footnotes and annexes, if any, in this document are provided for informational purposes only and are not to be construed as a part of AGMA 923-B05, Metallurgical Specifications for Steel Gearing.]

In November, 1984, an ad hoc Metallurgy and Gear Rating Committee met to define the factors required to qualify the various metallurgical quality grades that were to be introduced into the gear rating standard that eventually became ANSI/AGMA 2001- B88, Fundamental Rating Factors and Calculation Methods for Involute Spur and Helical Gear Teeth.

In May, 1988, ANSI/AGMA 6033-A88, Standard for Marine Propulsion Gear Units – Part 1, Materials, was published using a short list of metallurgical factors in table form.

In September, 1988, ANSI/AGMA 2001-B88 was published using metallurgical factors in table form.

Starting in July, 1992, AGMA representatives participated in writing ISO 6336-5, Calculation of Load Capacity of Spur and Helical Gears – Part 5: Strength and Quality of Materials, which was a modification of the tables in ANSI/AGMA and DIN Standards.

In February, 1993, AGMA 6002-B93, Design Guide for Vehicle Spur and Helical Gears, was published using a modified version of the tables used in ANSI/AGMA 2001-B88.

In September, 1993, the AGMA Metallurgy and Materials Committee accepted the task of consolidating the various tables to avoid redundancies and conflicting requirements, and started work on AGMA 923 A00, Metallurgical Specifications for Steel Gearing.

In January, 1995, a revised ANSI/AGMA 2001-C95 was published using a version of the ANSI/AGMA 2001-B88 tables as revised by the AGMA Helical Gear Rating Committee.

In November, 1997, a revised ANSI/AGMA 2003-B97, Rating the Pitting Resistance and Bending Strength of Generated Straight Bevel, Zerol Bevel and Spiral Bevel Gear Teeth, was published using a version of the ANSI/AGMA 2001-B88 tables as revised by the AGMA Bevel Gearing Committee.

The committee reviewed all metallurgical tables of the gear rating standards ANSI/AGMA 2001-B88, ANSI/AGMA 2003-A86, and ISO 6336-5:1996 and their proposed revisions to develop consolidated tables describing the metallurgical characteristics associated with each specific type of heat treatment and metallurgical quality grade. Effort was made to reference ISO specifications where possible. The consolidated tables were submitted to the gear rating committees for their agreement and are published here for reference by other standards.

AGMA’s goal is to develop a consistent metallurgical specification which reflects the quality requirements for steel gearing. AGMA 923-A00 was such a document, and was intended to be consistent with the applicable portions of ISO 6336-5:1996, to the extent possible while the two standards were in parallel development. The AGMA Technical Division Executive Committee approved the publication of AGMA 923-A00 in August, 2000.

This edition of the information sheet, AGMA 923-B05, incorporates changes to item 8, microstructure, of table 1, Metallurgical characteristics for through hardened gearing. The balance of the document remains unchanged. The AGMA Technical Division Executive Committee approved the publication of AGMA 923 B05 in May, 2005.

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