SAE J1268 PDF

SAE SAE J Page 4 Note 3: Deleted all references to tables because they are currently under review and have not been balloted. Left in reference to SAE J SCOPE Restricted hardenability steels have been in use for some time but the specific restrictions for a particular grade depend upon customer needs and vary from mill to mill.

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SAE SAE J Page 4 Note 3: Deleted all references to tables because they are currently under review and have not been balloted. Left in reference to SAE J SCOPE Restricted hardenability steels have been in use for some time but the specific restrictions for a particular grade depend upon customer needs and vary from mill to mill.

Such steels are desirable to provide more controlled heat treatment response and dimensional control for critical parts. Because of increasing interest in steels with restricted hardenability, the SAE Iron and Steel Technical Committee directed Division 8 to prepare a set of standard steels with restricted hardenability.

Generally the restricted hardenability band follows the middle of the corresponding standard H-band. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.

SAE invites your written comments and suggestions. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. As the need arises for restricted hardenability in other grades, they will be added to the standard.

These limits are somewhat narrower than allowed for standard H-steels. It should be understood that alloys which satisfy the restricted hardenability band will fall within SAE J composition limits, but not all steels melted to the composition limits would meet the required RH-band. The limits are given in Table 1, and as indicated in the footnotes, are subject to permissible variations for product analysis and may contain certain levels of elements not specified.

It is important that steel consumers use this special identifying designation in specification requirements, as there is no other means of determining when restricted hardenability band limits apply. When the special identification is used, the steel shall conform to all conditions pertaining to chemical composition limits, restrictions, testing technique, and so forth, as outlined herein.

Values below 20 HRC are not specified because such values are not as accurate. Band limits are also shown graphically and are so depicted for convenience in estimating the hardness values at various intermediate locations on the end quench test bar and for quick comparisons of the various RH grades.

The RH-bands are presented graphically, with distances from the quenched end in both metric SI units and U. The hardenability testing technique used as a basis for acceptance shall be in accordance with SAE J In general, these points define the critical locations of the Jominy hardenability band for purposes of characterizing heat treatment response.

The four specification points are circled in the tables of hardness versus Jominy distance and on the RH-bands. For example, referring to the right-hand hardness limit table in Figure 1, a hardenability test bar of a steel meeting the requirements for RH must exhibit a hardness at J1 not less than 54 HRC nor more than 59 HRC.

At J12, the test bar must exhibit hardness not less than 43 HRC, but the maximum hardness can be as high as 52 HRC or even 54 HRC if this region of the test bar is chosen as the exception. At J20, the bar must exhibit hardness not greater than 47 HRC, but the minimum hardness can be as low as 37 HRC or as low as 35 HRC if this region of the test bar is chosen as the exception.

A similar example, for RH with distances from the quenched end in millimeters, would limit hardness at J1. At J20 mm, the test bar must exhibit hardness not less than 42 HRC. At J30 mm, the test bar must exhibit hardness not greater than 48 HRC. Small quantities of certain elements may be found in alloy steel which are not specified or required. These elements are considered as incidental and acceptable to the following maximum amounts: copper to 0. Maximum sulfur content is 0.

Ranges and limits are subject to the permissible variations for product analysis shown in SAE J These steels can be expected to contain 0. NOTES 8. An R symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and R are not used in original publications, nor in documents that contain editorial changes only.

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Introduction to Our Products:. We can produce the SAE J has the following specifications:. Value below normal HRC range, for comparison purposes only. Machining performance. Download SAE J the mechanical properties of the report, the report provides detailed performance analysis and application. Principal Design Features.

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