1、Designation: A 600 92a (Reapproved 2004)Standard Specification forTool Steel High Speed1This standard is issued under the fixed designation A 600; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number
2、in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This specification covers tungsten-type andmolybdenum-type h
3、igh-speed steels available as annealed,hot-rolled bars, forgings, plate, sheet, or strip, and annealed,cold-finished bars or forgings used primarily in the fabricationof tools.1.2 Seven types of tungsten high-speed tool steels desig-nated T1, T2, etc., seventeen types of molybdenum high-speedtool st
4、eels designated M1, M2, etc., and two intermediate highspeed steels designated as M50 and M52 are covered. Selectionwill depend upon design, service conditions, and mechanicalproperties.1.3 The term “high-speed steel” is described and its mini-mum requirements are covered in the Annex.1.4 The values
5、 stated in inch-pound units are to be regardedas the standard. The values given in parentheses are providedfor information only.2. Referenced Documents2.1 ASTM Standards:2A 370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA 388/A 388M Practice for Ultrasonic Examination ofHeav
6、y Steel ForgingsA 561 Practice for Macroetch Testing of Tool Steel BarsA 700 Practices for Packaging, Marking, and LoadingMethods for Steel Products for Domestic ShipmentE3 Methods of Preparation of Metallographic SpecimensE30 Test Methods for Chemical Analysis of Steel, CastIron, Open-Hearth Iron,
7、and Wrought IronE45 Practice for Determining the Inclusion Content ofSteelE59 Practice for Sampling Steel and Iron for Determinationof Chemical Composition2.2 Military Standard:MIL-STD-163 Steel Mill Products, Preparation for Ship-ment and Storage32.3 Federal Standards:Fed. Std. No. 123 Marking for
8、Shipment (Civil Agencies)3Fed. Std. No. 183 Continuous Identification Marking ofIron and Steel Products33. Classification3.1 Material in accordance with this specification is classi-fied by chemical composition. Types correspond to respectiveAISI designations.3.1.1 Types T1, T2, T4, T5, T6, T8, and
9、T15 are character-ized by a controlled high tungsten content along with otheralloying elements.3.1.2 Types M1, M2, M3, M4, M6, M7, M10, M30, M33,M34, M36, M41, M42, M43, M44, M46, M47, M48, and M62are characterized by a controlled high molybdenum contentalong with other alloying elements.3.1.3 Types
10、 M2, M3, and M10 are further classified accord-ing to carbon range. Type M3 is further classified according tovanadium range.3.1.4 Types M50 and M52 are considered intermediate highspeed steels in view of their lower total alloy content than thestandard types. These leaner alloy grades normally are
11、limitedto less severe service conditions.4. Ordering Information4.1 Orders for material under this specification shall includethe following information, as required to describe adequatelythe desired material:4.1.1 Name of material (high-speed tool steel),4.1.2 Type,4.1.3 Shape (sheet, strip, plate,
12、flat bar, round bar, squarebar, hexagon bar, octagon, special shapes),4.1.4 Dimensions (thickness, width, diameter, length). (Forcoils, include the minimum inside diameter or inside diameterrange, the maximum outside diameter, and maximum orminimum coil weight if required. (Minimum coil weights ares
13、ubject to negotiation.),1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys , and is the direct responsibility of SubcommitteeA01.29 on Tool Steel.Current edition approved Sept. 1, 2004. Published Jan. 2005. Originallyapproved in 1969. Last
14、 previous edition A 600 92a (1999).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Standardiz
15、ation Documents Order Desk, Bldg. 4 Section D, 700Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.1.5 Finish (hot rolled, forged, blasted or pickled, colddrawn, rough machined,
16、 ground, precision ground and pol-ished),4.1.6 Condition (annealed),4.1.7 ASTM designation and date of issue, and4.1.8 Special or supplementary requirements.5. Materials and Manufacture5.1 Unless otherwise specified, material covered by thisspecification shall be made by an electric melting process.
17、6. Chemical Composition6.1 An analysis of each heat of steel shall be made by themanufacturer to determine the percentage of the elementsspecified and these values shall conform to the requirements asto chemical composition specified in Table 1. If requested orrequired, the chemical composition shal
18、l be reported to thepurchaser or his representative.6.2 Analysis may be made by the purchaser from finishedbars and forgings by machining off the entire cross section anddrilling parallel to the axis of the bar or forging at any pointmidway between the center and surface in accordance with thelatest
19、 issue of Method E59. The chemical analysis of thedrilling chips shall be made in accordance with the latest issueof Methods E30. The chemical composition thus determinedshall not vary from the limits specified in Table 1.7. Hardness Requirements Hardness Requirements7.1 Annealed hardness values whe
20、n obtained in accordancewith the latest issue of Test Methods and Definitions A 370shall not exceed the Brinell hardness values (or equivalentRockwell hardness values) specified in Table 2.7.2 Specimens for determination of minimum response tohardening shall be14-in. (6.4-mm) thick disks cut so as t
21、orepresent either the full cross-sectional area or that midwaybetween the center and outer surface of the material. If thematerial form or size does not lend itself to accurate hardnessdetermination on14-in. thick cross-sectional disks, then longi-tudinal specimens may be used for hardness testing.
22、Examplesare round bars less than12 in. (12.7 mm) in diameter; sheet;and strip. In this case, the specimen shall be a minimum of 3in. (76.2 mm) in length, and parallel flats shall be ground on theoriginal mill surfaces. The specimens shall be heat treated intwo furnaces, one operating as a preheat fu
23、rnace and the otherTABLE 1 Chemical Requirements, %AUNSDesigna-tionBType Carbon Manganese Phos-phorusSulfurCSilicon Chromium Vanadium Tungsten Molybdenum Cobaltmin max min max max max min max min max min max min max min max min maxTungsten-Type High-Speed SteelsT12001 T1 0.65 0.80 0.10 0.40 0.03 0.0
24、3 0.20 0.40 3.75 4.50 0.90 1.30 17.25 18.75 . . . . . . . . . . . .T12002 T2 0.80 0.90 0.20 0.40 0.03 0.03 0.20 0.40 3.75 4.50 1.80 2.40 17.50 19.00 . . . 1.00 . . . . . .T12004 T4 0.70 0.80 0.10 0.40 0.03 0.03 0.20 0.40 3.75 4.50 0.80 1.20 17.50 19.00 0.40 1.00 4.25 5.75T12005 T5 0.75 0.85 0.20 0.4
25、0 0.03 0.03 0.20 0.40 3.75 5.00 1.80 2.40 17.50 19.00 0.50 1.25 7.00 9.50T12006 T6 0.75 0.85 0.20 0.40 0.03 0.03 0.20 0.40 4.00 4.75 1.50 2.10 18.50 21.00 0.40 1.00 11.00 13.00T12008 T8 0.75 0.85 0.20 0.40 0.03 0.03 0.20 0.40 3.75 4.50 1.80 2.40 13.25 14.75 0.40 1.00 4.25 5.75T12015 T15 1.50 1.60 0.
26、15 0.40 0.03 0.03 0.15 0.40 3.75 5.00 4.50 5.25 11.75 13.00 . . . 1.00 4.75 5.25Molybdenum-Type High-Speed SteelsT11301 M1 0.78 0.88 0.15 0.40 0.03 0.03 0.20 0.50 3.50 4.00 1.00 1.35 1.40 2.10 8.20 9.20 . . . . . .T11302 M2 regular C 0.78 0.88 0.15 0.40 0.03 0.03 0.20 0.45 3.75 4.50 1.75 2.20 5.50 6
27、.75 4.50 5.50 . . . . . .high C 0.95 1.05 0.15 0.40 0.03 0.03 0.20 0.45 3.75 4.50 1.75 2.20 5.50 6.75 4.50 5.50 . . . . . .T11313 M3 Class 1 1.00 1.10 0.15 0.40 0.03 0.03 0.20 0.45 3.75 4.50 2.25 2.75 5.00 6.75 4.75 6.50 . . . . . .T11323 Class 2 1.15 1.25 0.15 0.40 0.03 0.03 0.20 0.45 3.75 4.50 2.7
28、5 3.25 5.00 6.75 4.75 6.50 . . . . . .T11304 M4 1.25 1.40 0.15 0.40 0.03 0.03 0.20 0.45 3.75 4.75 3.75 4.50 5.25 6.50 4.25 5.50 . . . . . .T11306 M6 0.75 0.85 0.15 0.40 0.03 0.03 0.20 0.45 3.75 4.50 1.30 1.70 3.75 4.75 4.50 5.50 11.00 13.00T11307 M7 0.97 1.05 0.15 0.40 0.03 0.03 0.20 0.55 3.50 4.00
29、1.75 2.25 1.40 2.10 8.20 9.20 . . . . . .T11310 M10 regular C 0.84 0.94 0.10 0.40 0.03 0.03 0.20 0.45 3.75 4.50 1.80 2.20 . . . . . . 7.75 8.50 . . . . . .high C 0.95 1.05 0.10 0.40 0.03 0.03 0.20 0.45 3.75 4.50 1.80 2.20 . . . . . . 7.75 8.50 . . . . . .T11330 M30 0.75 0.85 0.15 0.40 0.03 0.03 0.20
30、 0.45 3.50 4.25 1.00 1.40 1.30 2.30 7.75 9.00 4.50 5.50T11333 M33 0.85 0.92 0.15 0.40 0.03 0.03 0.15 0.50 3.50 4.00 1.00 1.35 1.30 2.10 9.00 10.00 7.75 8.75T11334 M34 0.85 0.92 0.15 0.40 0.03 0.03 0.20 0.45 3.50 4.00 1.90 2.30 1.40 2.10 7.75 9.20 7.75 8.75T11336 M36 0.80 0.90 0.15 0.40 0.03 0.03 0.2
31、0 0.45 3.75 4.50 1.75 2.25 5.50 6.50 4.50 5.50 7.75 8.75T11341 M41 1.05 1.15 0.20 0.60 0.03 0.03 0.15 0.50 3.75 4.50 1.75 2.25 6.25 7.00 3.25 4.25 4.75 5.75T11342 M42 1.05 1.15 0.15 0.40 0.03 0.03 0.15 0.65 3.50 4.25 0.95 1.35 1.15 1.85 9.00 10.00 7.75 8.75T11343 M43 1.15 1.25 0.20 0.40 0.03 0.03 0.
32、15 0.65 3.50 4.25 1.50 1.75 2.25 3.00 7.50 8.50 7.75 8.75T11344 M44 1.10 1.20 0.20 0.40 0.03 0.03 0.30 0.55 4.00 4.75 1.85 2.20 5.00 5.75 6.00 7.00 11.00 12.25T11346 M46 1.22 1.30 0.20 0.40 0.03 0.03 0.40 0.65 3.70 4.20 3.00 3.30 1.90 2.20 8.00 8.50 7.80 8.80T11347 M47 1.05 1.15 0.15 0.40 0.03 0.03
33、0.20 0.45 3.50 4.00 1.15 1.35 1.30 1.80 9.25 10.00 4.75 5.25. . . M48 1.42 1.52 0.15 0.40 0.03 0.07 0.15 0.40 3.50 4.00 2.75 3.25 9.50 10.50 4.75 5.50 8.00 10.00. . . M62 1.25 1.35 0.15 0.40 0.03 0.07 0.15 0.40 3.50 4.00 1.80 2.10 5.75 6.50 10.00 11.00 . . . . . .Intermediate High Speed SteelsT11350
34、 M50 0.78 0.88 0.15 0.45 0.03 0.03 0.20 0.60 3.75 4.50 0.80 1.25 . . . . . . 3.90 4.75 . . . . . .T11352 M52 0.85 0.95 0.15 0.45 0.03 0.03 0.20 0.60 3.50 4.30 1.65 2.25 0.75 1.50 4.00 4.90 . . . . . .AChemistry limits include product analysis tolerances. Unless otherwise specified, nickel plus coppe
35、r equals 0.75 % max for all types.BNew designation established in accordance with Practice E 527 and SAE J 1086.CWhere specified, sulfur may be 0.06 to 0.15 % to improve machinability.A 600 92a (2004)2as a high-heat furnace. The furnaces may be either controlledatmosphere or molten-salt bath. The au
36、stenitizing temperatureranges stipulated in Table 3 cover both furnace types.7.2.1 After being austenitized for the proper time, thesamples may be oil quenched or quenched in molten salt plusair cooling. When a salt quench is employed, its temperatureshall be 1050 to 1175F (566 to 635C) except for M
37、3, M4,M41, , M42,M43 , M46, M47, M48, M62, and T15, when itshall be 1000 to 1075F (538 to 579C). All samples shall bedouble tempered at 1025F (552C) for 2 h each cycle exceptfor M0 and M52 which shall be given two tempering cycles of2 h each at 1000F and M41, M42, M43, M44, M46, M47,M48, M62, and T1
38、5, which shall be given three temperingcycles of 2 h each at 1000F.7.2.2 The hardness of the specimen after the specified heattreatment shall meet the minimum hardness value for theparticular type of steel shown in Table 3. Rockwell C testsshould be used where possible but light-load tests may benec
39、essary on thin specimens. These tests should be specified byagreement between seller and purchaser. The hardness valueshall be obtained in accordance with the latest issue of TestMethods and Definitions A 370 and shall be the average of atleast five readings taken in an area midway between the cente
40、rand surface of the largest dimension of the cross-sectionalspecimen or along the parallel surfaces of the longitudinalspecimen. The surface to be tested shall be ground sufficientlyto remove any surface condition, scale, carburization, ordecarburization which might affect readings.8. Macrostructure
41、8.1 The macrostructure of a specimen representing theentire cross-sectional area in the annealed condition andprepared in accordance with the latest issue of Practice A 561shall exhibit a structure free of excessive porosity, slag, dirt, orother nonmetallic inclusions, pipes, checks, cracks and othe
42、rinjurious defects.8.2 Macroetch severity levels for center porosity and ingotpattern, illustrated photographically in PracticeA 561, shall notexceed the ratings specified in Table 4 for the appropriatematerial size and composition.9. Decarburization9.1 Decarburization shall be determined on a speci
43、menrepresenting a cross section of the material and prepared inaccordance with the latest issue of Methods E3. Whenexamined at 203 or greater magnification, it shall not exceedthe values given in Tables 5-8 for the appropriate size andshape of the material.9.2 Material ordered as drill rod, ground a
44、nd polished,centerless ground, ground finished, or machine finished flatsand squares shall be free of scale and decarburization.10. Permissible Variations in Dimensions10.1 Permissible variations in dimensions shall not exceedthe applicable limits stated in Tables 8-22, incl. Where out-of-round or s
45、quare requirements are shown, they shall be deter-mined as follows:10.1.1 Out-of-RoundDifference between high and lowreadings as determined by micrometers or other suitablemeasuring instruments.10.1.2 Out-of-SquareThe amount required to be removedfrom each edge in order to square the edge with the f
46、ace asdetermined with a square and suitable measuring instruments.11. Workmanship, Finish, and Appearance11.1 High-speed tool steel shall be free of heavy scale, deeppitting, laps, porosity, injurious segregations, excessive non-metallic inclusions, seams, cracks, checks, slivers, scale marks,dents,
47、 soft and hard spots, pipes, or any defects that woulddetrimentally affect the suitability of the material, after re-moval of the recommended stock allowance. (See Tables 5-8)11.2 Visual examination shall be made to ensure compliancewith the requirements for workmanship, finish, dimensions andtolera
48、nces, identification marking, and packaging.12. Sampling12.1 Unless otherwise specified, a lot shall consist of allmaterial submitted for inspection at the same time, of the sameheat, type, finish, and size, and must conform to the provisionsof this specification.13. Inspection13.1 Unless otherwise
49、specified in the contract or purchaseorder, the supplier is responsible for the performance of allinspection requirements as specified herein. The supplier mayutilize his own facilities or any other acceptable to thepurchaser.TABLE 2 Maximum Brinell Hardness in Annealed or Cold DrawnConditionType AnnealedBHNCold DrawnAnnealed BHNCold DrawnBHNM1 248 255 262M2 (regular C) 248 255 262M2 (high C) 255 262 269M3, Class 1 andClass 2255 262 269M4 255 262 269M6 277 285 293M7 255 262 269M10 (regular C) 248 255 262M10 (high C) 255 262 269M30 269 277 285M33 269 277 285M34 269 277 2
