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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Harderability curves oblainedfrom lests on these smaller specimeDs therefore are not comparablewith curves obtained tiom tesls on the slandard 1.

ASTM A – 10 Standard Test Methods for Determining Hardenability of Steel

For the a25 heat with 0. It such changescausedby grtudnrg lue indicated,new flats may be J 6. These inflections will be minoa however and should be disregarded.

I This methodof Jominy Hardenabililycalculationfrom the chemical ideal diane er DI on a steel is basedon the original work ol M.

It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. L Hardenabiliry resultsareto be reponedfor lbe firs! LhaL can becontrolledto aheightof2.


The Certified Material Test Report shall state the method of hardenability determination. Hardnoss 17 4 Dlvldlng Factors BoronSteels.

The two test methods include the quantitative end-quench or Jominy Test and a method for calculating the hardenability of steel from the chemical composition based on the original work by M. Ii is important to heat the specimen jn such an atmosphefethat p.

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IlnegodaEd bctweenthe supplier and the user,the end-qucDch specnnen may be prepared from a gllen locarion in a forged or rolled product or fiom a coDtinuous cast blllet. The mold may also be usedto fom a 1. The procedure in p.

Ifthe specimen Dotcold whenremovedfrom is the fixlure.

Tl,e the hardenability steelby the end-quench rest consislsof waler quenchingone end of a cylindr;cal lest specimen 1. Harddess, HRC 49 4A 41 50 50 47 45! The time berweenremoval of the specimeD ltom the turnaceand the beginning the quenchsbouldnot be more than5 s.

Examplesof rhis method are Jal6 jn. In producriontesting slightly loDger fof times ut! After the Woodsmetal is nohen, screwthe stud in place so lhat the specimen is lorced nrmly against the bonom of the hole. The useof these equations toplotcurves may resultin randominfletion pointsdueto the characterisrics of polynomial equalions. 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.


Martensite versus DI in Tables 8 and 9 are calculatedfrom the equalionsin Table For lhe example non boron SAE nodified heat coniaining 0. Jominy Distance for 50 9.

The suppon tbr rhe specnncnshall be dry at the beginningof eachlcst. Multiplying Factors in Table 6 are calculated from the equations in Table I 1.

Slrallower ground depths can afilct reproducibjlity ofresults,and corelation wirh cooling ra es quenched ba. I and of such size as to permit lhe remolal ofall deca. The orifice size and distance the specrmen of r.

Prcgrcs, Novenber87 In casesof lack of reprodlcibility or of dillerencesbetweenlaboratories, indenterspacingshould be measu. They should bc mutually pddlel and the grindirg done in such a astn thai no change of rhe quencbedslrucruretakes place.

ASTM A – The Jominy End Quench Test of Hardenability

Dnabdi E,v0hg FaCu,r tn. Dnnensions of the pretered specimenand of aD optional specimen Nole: U rc al thi6. The specnnen shnll bc nachined fiom a bar preliously normalized in accordrnce with 6. A salisfaciorytype oi suppofl for he slanddrd1. Dn, dng Fictoc tor Non-Bo. However, to facilitate melting lrocess control s255 higher alloy steels.