ASTM A255 10 PDF

May 18, 2019

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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For the example heat with 0. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. The tesrspccinen shallbe 1. The sheathshall preferablybe made from a plain low-carbon steel. It is measured asym, usually by noting the extent or depth of hardening of a standard size and shape of test specimen in a standardized quench.

Cast testsneednot be normalized.

The values given in parentheses are for t. For lhe example non boron SAE nodified a25 coniaining 0. For rhe examplein They should bc mutually pddlel and the grindirg done in such a manner thai no change of rhe quencbedslrucruretakes place.

Then placethe healedspecimen lhe in supportso thrt jis bottom lace is 0. Values below 20 HRC are no!

ASTM A确定钢的淬透性的标准检验方法_图文_百度文库

The higherthe carbon or alloy conteDt, both, the lowef the boron factor or Then heat the assemblyand quench in accordaDce with 6. Ii is important to heat the specimen jn such an atmosphefethat p. The test consists of water quenching asrm end of a cylindrical test specimen 1. Etch in solulion No.


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In casesof lack of reprodlcibility or of dillerencesbetweenlaboratories, indenterspacingshould be measu. These refinements sandsof heatsof boron and non-boron Ifthe specimen Dotcold whenremovedfrom is the fixlure. Ilis recomnendedlhata tesrblock be interyosed between specimen the and the indente. I and of such size as to permit lhe remolal ofall deca. The time berweenremoval of the specimeD ltom the turnaceand the beginning the quenchsbouldnot be more than5 s. After ihe quench, w: The previousthennalhistoryof the specirnen resred shall 5.

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.

U rc al thi6. The suppon tbr rhe specnncnshall be dry at the beginningof eachlcst. In producriontesting slightly loDger fof times ut! Jominy Distance for 50 9. Hardnoss 17 4 Dlvldlng Factors BoronSteels. After the Woodsmetal is nohen, screwthe stud in place so lhat the specimen is lorced nrmly against the bonom of the hole. Tlresesmaller specjmens shall be testedin accordance witb 5 of the method exceptlhat modilicatjons requiredin the waler streams are for queDching.

The useof these equations toplotcurves may resultin randominfletion pointsdueto the characterisrics of polynomial equalions.

The efects of phos phorousand sultur are no! Yut camank wit taeive caEtut cffiid. Resting1bespecimenin a V block is not 6.

YM ehnents aG invited enhet to. Multiplying Factors in Table 6 are calculated from the equations in Table I 1. ThenmakeRockwell hardness measurementson the C scaleon the specimen Fescribed in 6. The orifice size and distance the specrmen of r. For simpliciry,only multiplying faclors for DI in inch pouDd units de given. Dnnensions of the pretered specimenand of aD optional specimen Nole: In the end-quench test the ast of hardening is the distance along the specimen from the quenched end which correlates to a given hardness level.


Placc a disk of graphiteo.

L Hardenabiliry resultsareto be reponedfor lbe firs! Equalions in rcpresent ing a leasrsquares polynomialfir of tbe daiacontained Table in 7 is listedin Table Harddess, HRC 49 4A 41 50 50 47 45!

Referenced Documents purchase separately Astn documents listed below are referenced within the subject standard but are not provided as part of the standard. For rhe example i! The positioningol tbe indentershouldbe checkedwith sulllcienlliequencyto provideassufance accuracy lhat requiremenls are being met.

Very lighl cuts with wabr coolins axtm a coarse. It such changescausedby grtudnrg lue indicated,new flats may be J 6. Link to Active This link will always route to the current Active version of the standard.

Fd rLrcnced Asstm M: This may be accompljshedby herting the specimen a vertical posilion in x contaiDer in with an elsily removable coler containingx layer ofcrst iron chips wilh the bottonr face of rhe specimen resiing on lhe chips.

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