J406-1985

Methods of Determining Hardenability of Steels

J406-1985 发布历史

This SAE Standard prescribes the procedure for making hardenability tests and recording results on shallow and medium hardening steels@ but not deep hardening steels that will normally air harden. Included are procedures using the 1 in (25 mm) standard hardenability end quench specimen for both medium and shallow hardening steels@ Surface-Area-Center (SAC) method for shallow hardening steels@ subsize method for bars less than 1 ? in (32 mm) in diameter@ and methods for determining carburized hardenability. (See Appendix A.) Any hardenability tests made under other conditions than those given in this SAE Standard will not be deemed standard and will be subject to agreement between supplier and user. Whenever check tests are made@ all laboratories concerned must arrange to use the same alternate procedure with reference to test specimen and method of grinding for hardness testing. For routine testing of the hardenability of successive heats of steel required to have hardenability within certain limits@ it is sufficient to designate hardenability simply in terms of distance from the quenched end to the point at which a certain hardness is obtained. This designation is also adequate for comparing steels of different compositions to see whether they have similar hardenability. Hardenability limits for specifying steel in this manner are obtained by measuring the hardenability of a steel which has proved satisfactory for the use intended. The hardenability test may be used in this way as an empirical test. For new components where manufacturing experience is lacking@ hardenability data may be effectively used to estimate the hardness profile provided by any given steel. Attendant@ the ability to predict hardenability from chemical composition has become increasingly important when comparing various steel grades or developing new steels for specific applications. One such procedure is describe in Appendix B. Other hardenability prediction methods are available from the selected references in paragraph B6. However@ it should be emphasized that the use of any hardenability procedure does not preclude the importance of conducting Jominy end-quench tests to determine the actual hardenability of any specific grade of steel. Hardenability data may be used to estimate harnesses obtainable with any steel in new machine parts not yet in production and not similar to any parts on which production experience is available. Various hardenability application methods are described in the selected references in the Bibliography. It appears none of these methods is precise@ but these are often useful for estimation purposes. Final correlation on actual parts is necessary.

J406-1985由SAE - SAE International 发布于 1985-05-01，并于 2013-02-06 实施。

J406-1985的历代版本如下：

• 1985年05月01日 J406-1985
• 1990年11月30日 J406-1990
• 1993年06月14日 J406-1993
• 1995年02月01日 J406-1995
• 1998年05月01日 J406-1998
• 2009年03月01日 J406-2009

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标准号

J406-1985

发布日期

1985年05月01日

实施日期

2013年02月06日

废止日期

无

中国标准分类号

/

国际标准分类号

/

发布单位

SAE - SAE International

引用标准

23

适用范围

This SAE Standard prescribes the procedure for making hardenability tests and recording results on shallow and medium hardening steels@ but not deep hardening steels that will normally air harden. Included are procedures using the 1 in (25 mm) standard hardenability end quench specimen for both medium and shallow hardening steels@ Surface-Area-Center (SAC) method for shallow hardening steels@ subsize method for bars less than 1 ? in (32 mm) in diameter@ and methods for determining carburized hardenability. (See Appendix A.) Any hardenability tests made under other conditions than those given in this SAE Standard will not be deemed standard and will be subject to agreement between supplier and user. Whenever check tests are made@ all laboratories concerned must arrange to use the same alternate procedure with reference to test specimen and method of grinding for hardness testing. For routine testing of the hardenability of successive heats of steel required to have hardenability within certain limits@ it is sufficient to designate hardenability simply in terms of distance from the quenched end to the point at which a certain hardness is obtained. This designation is also adequate for comparing steels of different compositions to see whether they have similar hardenability. Hardenability limits for specifying steel in this manner are obtained by measuring the hardenability of a steel which has proved satisfactory for the use intended. The hardenability test may be used in this way as an empirical test. For new components where manufacturing experience is lacking@ hardenability data may be effectively used to estimate the hardness profile provided by any given steel. Attendant@ the ability to predict hardenability from chemical composition has become increasingly important when comparing various steel grades or developing new steels for specific applications. One such procedure is describe in Appendix B. Other hardenability prediction methods are available from the selected references in paragraph B6. However@ it should be emphasized that the use of any hardenability procedure does not preclude the importance of conducting Jominy end-quench tests to determine the actual hardenability of any specific grade of steel. Hardenability data may be used to estimate harnesses obtainable with any steel in new machine parts not yet in production and not similar to any parts on which production experience is available. Various hardenability application methods are described in the selected references in the Bibliography. It appears none of these methods is precise@ but these are often useful for estimation purposes. Final correlation on actual parts is necessary.