SAE J Revised MAY 3. Chemical Composition Limits—To permit steel producers the necessary latitude to meet the standard hardenability limits, the. 1 May Buy SAE J Hardenability Bands For Carbon And Alloy H Steels from SAI Global. MIL-SPEC SAE A H A H MIL-S J H A H MIL-S J H A H MIL-S .
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Other hardenability prediction methods are available from the selected references in Section 2.
20NiCrMo, AISI , M20 – Case-hardening steel
Whenever check tests are made, all laboratories concerned must arrange sae j1268 use the same alternate procedure with reference sae j1268 test specimen and method of grinding for hardness testing. 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. Final correlation on sae j1268 parts is necessary. Attendantly, the ability to predict hardenability from chemical composition has become increasingly important when comparing various steel grades or developing new steels for specific applications.
The hardenability test may be used sae j1268 this sae j1268 as an empirical j1628. Various hardenability application methods are described in the selected references, Section 2. However, it should be emphasized that the use of any hardenability prediction procedure does not preclude the importance of conducting Jominy end-quench tests to determine the actual hardenability of any specific grade of steel.
Any hardenability test made under other conditions than those given in this document will not be deemed standard and sae j1268 be subject to agreement between supplier and user.
For new sae j1268 where manufacturing experience is lacking, hardenability data may be effectively used to estimate the hardness profile provided by any given steel.
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Methods for determining case hardenability of carburized steels are given in SAE J It appears none of these methods are precise, but these are often useful for estimation purposes. Hardenability data may be used to estimate hardnesses obtainable with any steel in new machine parts not yet in production and not similar to any parts on which production experience is available.
This SAE Standard prescribes the procedure for making hardenability tests and recording results on sae j1268 and medium hardening steels, but not deep hardening sae j1268 that will normally sae j1268 harden. This designation may also be adequate for comparing steels of different compositions to see whether they have similar hardenability.
One such procedure is described in Appendix A. For routine testing of the hardenability of successive heats of steel required to have hardenability within sae j1268 limits, it is sufficient to sae j1268 hardenability simply in terms of distance from the quenched end to the point j1628 which a certain hardness is obtained.