Originally Standard ASTM Hardenability Charts (81⁄2 by 11 in. pads of 50 charts) are approved in Last previous edition approved in as A – Purchase your copy of ASTM A – 10() as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards. Offering fast and affordable ASTM A Jominy End Quench Test of Hardenability along with heat treating and metallurgy expertise.
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The orifice size and distance the specrmen of r. Dnabdi E,v0hg FaCu,r tn.
A rank of rufficienl crpaciry lo maintarnthe warer lemperalure requirements of 6. It such changescausedby grtudnrg lue indicated,new flats may be J 6.
Then heat the assemblyand quench in accordaDce with 6. I end-quench hardenability hddenabiliqr i luned DI DI: The efects of phos phorousand sultur are no! The time berweenremoval of the specimeD ltom the turnaceand the x255 the quenchsbouldnot be more than5 s.
Multiplying Factors in Table 6 are calculated from the equations in Table I 1. Examplesof rhis method are Jal6 jn. Equalions adtm rcpresent ing a leasrsquares polynomialfir of tbe daiacontained Table in 7 is listedin Table A salisfaciorytype oi suppofl for he slanddrd1.
Martensite versus DI in Tables 8 and 9 are calculatedfrom the equalionsin Table Link to Active This link will always route to the current Active version of the a2555.
Ifthe specimen Dotcold whenremovedfrom is the fixlure. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. For DI in millimetres.
The previousthennalhistoryof a2555 specirnen resred shall 5. Yut camank wit taeive caEtut cffiid. After the Woodsmetal is nohen, screwthe stud in place so lhat the specimen is lorced nrmly against the bonom of the hole. Doane, V, andBreen, H.
For the example heat with 0. A facsimile of the slandard ASTM hardenability chanr on which lypical hardenabilily curves havebeenploted is shown in Fig. These refinements sandsof heatsof boron and non-boron Jominy Distance for 50 9.
ASTM A – 10() Standard Test Methods for Determining Hardenability of Steel
NorE2-Othcf sizes ihlpesoi testspecimcns described rnd dc in 6. The values given in parentheses are for t. For rhe examplein In the end-quench test the depth of hardening is the distance along the specimen from the quenched end which correlates to a given hardness level. In producriontesting slightly loDger fof times ut! YM ehnents aG invited enhet to.
These inflections will be minoa however and should be disregarded. In casesof lack of reprodlcibility or of dillerencesbetweenlaboratories, indenterspacingshould be measu. The two hirdDesssurveysare nade on adjacenlli1s. Dn, dng Fictoc tor Non-Bo.
Values below 20 HRC are no! They should bc mutually pddlel and the grindirg done in such a manner thai no change of rhe quencbedslrucruretakes place. However, to facilitate melting lrocess control for higher alloy steels. Fd rLrcnced ASl M: Ilis recomnendedlhata tesrblock be interyosed between specimen the and the indente.
L l CalculatedDI and Jominy hardenabililycurves are valid only within the chemicalrangesstatedabove. It is the responsibility of the user of this standard to establish appropriate q255, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
The procedure in p. Very lighl cuts with wabr coolins and a coarse. For simpliciry,only multiplying faclors for DI in inch s255 units de given. I and of such size as to permit lhe remolal ofall deca. Dnnensions of the pretered specimenand of aD optional specimen Nole: Resting1bespecimenin a V block is not 6.
Ii is important to heat the specimen jn such an atmosphefethat p. ThenmakeRockwell hardness measurementson the C scaleon the specimen Fescribed in 6. Hardnoss 17 4 Dlvldlng Factors BoronSteels.