ASTM A255-10确定钢的淬透性的标准检验方法

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Designatlon:A255-10
StandardTest Methodsfor DeterminingHardenability Steell ot
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l. Scope L I Thesetest me$ods cover $e identification and descriplior oftest methods detemining the hedenability of steels. for The lwo lesl methodsinclude the qudtitative end quenchor Jomiiy Testmd a melhod for calculatingthe hardenability of composition b$ed on the ofigjnal work sieelfiom thecbenrical by M. A. Grossman. ot 1.2 The selecr.ion the tesl methodto be used for deterof mining the hardenabilily a given stel shall be agreedupon between the supplier and user. The Cerlified Malerial Test Report shall staterhe m€lhod of hardenability determination. in 1.3 The calcuhlion methoddescribed thesetest methods is applicableonly to the range of chemicalconposirionsfiat
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TABLE 1 Normali/rn9 and AusrenitizingTemperalures4
found satisfltctory. watef suppltrIine shallalso bcprolided The with a quick opening!al!e. 5. T€st Specimens 5.t wrousht Sp..in.ns End queDchspecimensshall be prepared from rolled or torgedsLock shallreprresem fulL and Lhe crossscctionofthe product.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 tesrspccinen shallbe 1.0 in. (25.,1 mm) in diameterby,l.0 in. (101.6mm) in lengfi. wilh nenns for hanging it in a veltical posiiion fo. end quenching. Dnnensions of the pretered specimenand of aD optional specimen(Nole:) are givcn h Figs.2 and 3. The specnnen shnll bc nachined fiom a bar preliously normalized in accordrnce with 6. I and of such size as to permit lhe remolal ofall deca.burization machiningto 1.0in. round The end of in the specimeDto be water cooled shall have a reasoDably snooth tinisb. preferablyproduccdby srindnrg.Normalizing may be waived by agreement betweenthe supplier and $e user.The previousthennalhistoryof the specirnen resred shall 5.2 Cast Speciniens A sepdately cast end-quench speci men may be usedfor Donboron steels Ca( specinensare not suitablefof borcn sreelgrades due ro enatic fesults.A graphile or metalmold may be usedto forn an overleoglhspecimen 1.0 in. (25.4 n}m) in diametcrwhich shall be cut !o the sunddd slecnnen size.The mold may also be usedto fom a 1.25 in. (31.8 mm) diamelerspecimen which shall be machined the ro tiral specimen size.Cast testsneednot be normalized. NorE2-Othcf sizes ihlpesoi testspecimcns described rnd dc in
1.4 Hardenabilityis a measLrre $e deplh ro which lt€el of will hardenwhen qu€nched from its austenitizing temperature (Table l). I! js measured quantitatively, usuallyby noting the extentordepth oihardeningofa standard sizeandshape oflesl quench.In fie end-quench th€ specimen a standardized in test depthoihardening is the distance alongthe specimen from the quenched l€vel. end which corelares to a giveDhardness 1.5 The valuesstaledin inch poundunits ee to be regarded as rhe standard.The values given in parentheses are for t.6 This standaftl does not puryorl to address dll of 'e saftt\ con&nlJ, if an):, associated tith its use- It is the responsibili\ o.f nv user oI rltis staDdard to establish appto’ s° 1
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priate s.{et! un.l lcahlt ptuctic?s un.l dctentine the applictbili, of rcBulatory li,nitdtions prior to use. 2. Ref€renced Documen.s 2.1 ASTM Sta da,ns:a E I 8 TestMethods for Rockwell Ha.dness Melallic Maof E I I 2 Test Methodsfor DeterminingAver:rgeGmin Size 2.2 ASTM AdjunLts: ASTM HardenabiliryChartl END-QUENCH OR JOMINY TEST 3. Descripdon for 3.1 This resr meftod coven lhe procedure delermining of orJominy test.Tl,e the hardenability steelby the end-quench rest consislsof waler quenchingone end of a cylindr;cal lest specimen 1.0 ifl. in diameter and measuringthe hdrdening responseas a function of the distance from the qlenched end. 4, Apparatus 4.1 SuppottforTett Sp.ciaetr A fixturefor supponingthe lest specimenv€nically so that the lower end of the specimen is a distanceof 0.5 in. (12.7 mm) above rhe oriRce of lhe waler-quencbing device.A salisfaciorytype oi suppofl for |he slanddrd1.0-in.(25.4-mm)specimen shown in Fig. l. is Nm I suppd lor olher sizes shlpcs specinens and ol is A suiEblc