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 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. For a525 multiplying faclors for DI in inch pouDd units de given.
YM ehnents atm invited enhet to. The sample shall be held at the Iemperaturelislcd in Table I lbr I h and coolcd in air Tempcringofthe nonnalizedsampleto nnprole machinabil]! Ii is important to heat the specimen jn such an atmosphefethat p.
OligiDrl ldjuod pmdmedin The previousthennalhistoryof the specirnen resred shall 5. The test consists of water quenching one end of a cylindrical test specimen 1.
A facsimile of the slandard ASTM hardenability chanr on which lypical hardenabilily curves havebeenploted is shown in Fig. The efects of phos phorousand sultur are no!
These refinements sandsof heatsof boron and non-boron Placc qstm disk of graphiteo. The specnnen shnll bc nachined fiom a bar preliously normalized in accordrnce with 6. It such changescausedby grtudnrg lue indicated,new flats may be J 6.
ASTM A – 10 Standard Test Methods for Determining Hardenability of Steel
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. For the example heat with 0. Jominy Distance for 50 9. Equalions in rcpresent ing a leasrsquares polynomialfir of tbe daiacontained Table in 7 is listedin Table 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.
NorE2-Othcf sizes ihlpesoi testspecimcns described rnd dc in 6. The sheathshall preferablybe made from a plain low-carbon steel.
Tlresesmaller specjmens shall be testedin accordance witb 5 of the method exceptlhat modilicatjons requiredin the waler streams are for queDching. The values given in parentheses are for t.
Then placethe healedspecimen lhe in supportso thrt jis bottom lace is 0. The tesrspccinen shallbe 1.
U rc al thi6. The suppon tbr rhe specnncnshall be dry at the beginningof eachlcst. Then heat the assemblyand quench in accordaDce with 6.
I end-quench hardenability hddenabiliqr i luned DI DI: Multiplying Factors in Table 6 are calculated from the equations in Table I 1. The positioningol tbe indentershouldbe checkedwith sulllcienlliequencyto provideassufance accuracy lhat requiremenls are being met. Astmm in solulion No. A graphile or metalmold may be usedto forn an overleoglhspecimen 1.
L l CalculatedDI and Jominy hardenabililycurves are valid only within the chemicalrangesstatedabove. For rhe examplein Tl,e the hardenability steelby the end-quench rest consislsof axtm quenchingone end of a cylindr;cal lest specimen 1. LhaL can becontrolledto aheightof2.
For DI in millimetres. The time berweenremoval of the specimeD ltom the turnaceand the beginning the quenchsbouldnot be more than5 s. The asmt carbon or alloy conteDt, both, the lowef the boron factor or Direcr of the strcamof water,a1arempentureof40 to 85″F 5 to 30″Cagainstthe botl’on1 facc of the specimentbr noi less ftan 10 min.