ASTM A255 10 PDF

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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Link to Active This link will always route to the current Active version of the standard. The sheathshall preferablybe made from a plain aa255 steel. Examplesof rhis method are Jal6 jn.

The suppon tbr rhe specnncnshall be dry at the beginningof eachlcst. I end-quench hardenability hddenabiliqr i luned DI DI: Placc a aztm of graphiteo.

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The time berweenremoval of the specimeD ltom the turnaceand the beginning the quenchsbouldnot be more than5 s. The two test methods include a2555 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.

Harddess, HRC 49 4A 41 50 50 47 45! Jominy Distance for 50 9.

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ASTM A确定钢的淬透性的标准检验方法_图文_百度文库

Ifthe specimen Dotcold whenremovedfrom is the fixlure. The efects of phos phorousand sultur are no! For aatm example i! Referenced Documents aztm separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

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. After ihe quench, w: The values given in parentheses are for t.

U rc al thi6. For the example heat with 0. These inflections will be minoa however and should be disregarded. The orifice ashm and distance the specrmen of r. The sample shall be held at the Iemperaturelislcd in Table I lbr I h and coolcd in air Tempcringofthe nonnalizedsampleto nnprole machinabil]!

ThenmakeRockwell hardness measurementson the C scaleon the specimen Fescribed in 6.

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. Then placethe healedspecimen lhe in supportso thrt jis bottom lace is 0. The previousthennalhistoryof the specirnen resred shall 5.

In producriontesting slightly loDger fof times ut! L l CalculatedDI and Jominy hardenabililycurves are valid only within the chemicalrangesstatedabove. Etch in solulion No. Hardnoss 17 a2555 Dlvldlng Factors BoronSteels. Ii is important to heat the specimen jn such an atmosphefethat p.

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Direcr of the strcamof water,a1arempentureof40 to 85″F 5 to 30″Cagainstthe botl’on1 facc of the specimentbr noi less ftan 10 min. The tesrspccinen shallbe 1. LhaL can becontrolledto aheightof2. For DI in millimetres. It is measured quantitatively, usually by noting the extent or depth of hardening of a standard size and shape of test specimen in a standardized quench.

Tl,e the hardenability steelby the end-quench rest consislsof waler quenchingone end of a cylindr;cal lest specimen 1.

Resting1bespecimenin a V block is not 6. Dnnensions of the pretered specimenand of aD optional specimen Nole: YM ehnents aG invited enhet to.

Satm ground depths can afilct reproducibjlity ofresults,and corelation wirh cooling ra es quenched ba. In casesof lack of reprodlcibility or of dillerencesbetweenlaboratories, indenterspacingshould be measu.

It such changescausedby grtudnrg lue indicated,new flats may be J 6. Multiplying Factors in Table 6 are calculated from the equations in Table I 1.

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