SAE J1868-2010 PDF

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. In 1993, the American Society for Testing and Materials (ASTM) adopted the twelve SAE restricted hardenability steels and added ten more. SAE decided to include in SAE J1868 the additional 10 steels. In general, steels with restricted hardenability (RH Steels) will exhibit a hardness range not greater than 5 HRC at the initial position on the end- quench hardenability bar and not greater than 65% of the hardness range for standard H-band steels (SAE J1268) in the "inflection" region. Generally the restricted hardenability band follows the middle of the corresponding standard H-band. An example of the RH band compared with the standard H-band is given for SAE 4140.

SAE J1868-2010 Referenced Document

ASTM E112-10 Standard Test Methods for Determining Average Grain Size*， 2024-04-19 Update
SAE J1268-1995 Hardenability Bands for Carbon and Alloy H Steels
SAE J404-2009 Chemical Compositions of SAE Alloy Steels
SAE J406-2009 Methods of Determining Hardenability of Steels
SAE J409-1995 Product Analysis Permissible Variations from Specified chemical analysis of a Heat or Cast of Steel

2010 SAE J1868-2010 Restricted Hardenability Bands for Selected Alloy Steels
1993 SAE J1868-1993 (R) Restricted Hardenability Bands for Selected Alloy Steels, Standard September 1993
1990 SAE J1868-1990 Restricted Hardenability Bands for Selected Alloy Steels
1988 SAE J1868-1988 Restricted Hardenability Bands for Selected Alloy Steels