SAE J1868-1990
选定的合金钢受限制的淬透性带

Restricted Hardenability Bands for Selected Alloy Steels

被代替

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标准号

SAE J1868-1990

发布

1990年

发布单位

SAE - SAE International

替代标准

SAE J1868-1993

当前最新

SAE J1868-2010

 

 

适用范围

"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 harden ability@ the SAE Iron and Steel Technical Committee directed Division 8 to prepare a set of standard steels with restricted hardenability. In general@ steels with restricted hardenability (RH steels) will exhibit a hardness range not greater than 5 HRC at he initial position on the end-quench hardenability bar and not greater than 65% of the hardness range for standard H-band steels (see 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."

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