1、Designation: A304 11A304 16Standard Specification forCarbon and Alloy Steel Bars Subject to End-QuenchHardenability Requirements1This standard is issued under the fixed designation A304; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisi
2、on, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope*1.1 This specificat
3、ion covers hot-worked alloy, carbon, and carbon-boron steels in a variety of compositions and sizes, whichmay attain specified depth of hardening in the end quench test.These steel compositions are identified by the suffix letter “H” addedto the conventional grade number.1.2 This specification provi
4、des for analyses other than those listed under Tables 1 and 2. Special hardenability limits are alsopermissible when approved by the purchaser and manufacturer.1.3 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in thisstandard.2. Refe
5、renced Documents2.1 ASTM Standards:2A29/A29M Specification for General Requirements for Steel Bars, Carbon and Alloy, Hot-WroughtA108 Specification for Steel Bar, Carbon and Alloy, Cold-FinishedA255 Test Methods for Determining Hardenability of SteelE112 Test Methods for Determining Average Grain Si
6、zeE527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)2.2 Society of Automotive Engineers (SAE) Standard:3J 1086 Numbering Metals and Alloys3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 hardenabilitythe relative ability of a steel to harden und
7、er heat treatment becomes apparent in the degree to which thematerial hardens when quenched at different cooling rates. It is measured quantitatively, usually by noting the extent or depth ofhardening of a standard size and shape test specimen in a standardized quench. In the “end-quench” test the “
8、depth of hardening”is the distance along the specimen from the quenched end to a given hardness.4. Ordering Information4.1 Orders for material under this specification should include the following information, in proper sequence:4.1.1 Quantity (weight),4.1.2 Name of material (alloy, carbon, or carbo
9、n-boron steel),4.1.3 Cross-sectional shape,4.1.4 Size,4.1.5 Length,4.1.6 Grade,1 This specification is under the jurisdiction ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee A01.15on Bars.Current edition approved Oct. 1, 2011Dec. 1, 2
10、016. Published October 2011January 2017. Originally approved in 1947. Last previous edition approved in 2011 asA304 05A304 11. (2011). DOI: 10.1520/A0304-11.10.1520/A0304-16.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For A
11、nnual Book of ASTM Standardsvolume information, refer to the standardsstandard Document Summary page on the ASTM website.3 Available from SAE International (SAE), 400 Commonwealth Dr., Warrendale, PA 15096, http:/www.sae.org.This document is not an ASTM standard and is intended only to provide the u
12、ser of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard
13、as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1TABLE 1 Chemical Requirements of Alloy H SteelsANOTE 1Phos
14、phorus and sulfur in open-hearth steel is 0.035 %, max, and 0.040 %, max respectively. Phosphorus and sulfur in electric-furnace steel(designated by the prefix letter “E”) is 0.025 %, max.NOTE 2Small quantities of certain elements are present in alloy steels that are not specified or required. These
15、 elements are considered as incidentaland may be present to the following maximum amounts: copper, 0.35 %; nickel, 0.25 %; chromium, 0.20 %; molybdenum, 0.06 %.NOTE 3Chemical ranges and limits shown in this table are subject to the permissible variation for product analysis shown in Specification A2
16、9/A29M.NOTE 4Standard “H” Steels can be produced with a lead range of 0.150.35 %. Such steels are identified by inserting the letter “L” between thesecond and third numerals of the grade designation, for example, 41L40H. Lead is generally reported as a range of 0.150.35 %.UNSDesignationA Grade Desig
17、nationChemical Composition, %Carbon Manganese Silicon Nickel Chromium MolybdenumH 13300 1330 H 0.270.33 1.452.05 0.150.35 . . .H 13350 1335 H 0.320.38 1.452.05 0.150.35 . . .H 13400 1340 H 0.370.44 1.452.05 0.150.35 . . .H 13450 1345 H 0.420.49 1.452.05 0.150.35 . . .H 40270 4027 H 0.240.30 0.601.00
18、 0.150.35 . . 0.200.30H 40280 4028 HB 0.240.30 0.601.00 0.150.35 . . 0.200.30H 40320 4032 H 0.290.35 0.601.00 0.150.35 . . 0.200.30H 40370 4037 H 0.340.41 0.601.00 0.150.35 . . 0.200.30H 40420 4042 H 0.390.46 0.601.00 0.150.35 . . 0.200.30H 40470 4047 H 0.440.51 0.601.00 0.150.35 . . 0.200.30H 41180
19、 4118 H 0.170.23 0.601.00 0.150.35 . 0.300.70 0.080.15H 41300 4130 H 0.270.33 0.300.70 0.150.35 . 0.751.20 0.150.25H 41350 4135 H 0.320.38 0.601.00 0.150.35 . 0.751.20 0.150.25H 41370 4137 H 0.340.41 0.601.00 0.150.35 . 0.751.20 0.150.25H 41400 4140 H 0.370.44 0.651.10 0.150.35 . 0.751.20 0.150.25H
20、41420 4142 H 0.390.46 0.651.10 0.150.35 . 0.751.20 0.150.25H 41450 4145 H 0.420.49 0.651.10 0.150.35 . 0.751.20 0.150.25H 41470 4147 H 0.440.51 0.651.10 0.150.35 . 0.751.20 0.150.25H 41500 4150 H 0.470.54 0.651.10 0.150.35 . 0.751.20 0.150.25H 41610 4161 H 0.550.65 0.651.10 0.150.35 . 0.650.95 0.250
21、.35H 43200 4320 H 0.170.23 0.400.70 0.150.35 1.552.00 0.350.65 0.200.30H 43400 4340 H 0.370.44 0.550.90 0.150.35 1.552.00 0.650.95 0.200.30H 43406 E4340 H 0.370.44 0.600.95 0.150.35 1.552.00 0.650.95 0.200.30H 44190 4419 H 0.170.23 0.350.75 0.150.35 . . 0.450.60H 46200 4620 H 0.170.23 0.350.75 0.150
22、.35 1.552.00 . 0.200.30H 46210 4621 H 0.170.23 0.601.00 0.150.35 1.552.00 . 0.200.30H 46260 4626 H 0.230.29 0.400.70 0.150.35 0.651.05 . 0.150.25H 47180 4718 H 0.150.21 0.600.95 0.150.35 0.851.25 0.300.60 0.300.40H 47200 4720 H 0.170.23 0.450.75 0.150.35 0.851.25 0.300.60 0.150.25H 48150 4815 H 0.12
23、0.18 0.300.70 0.150.35 3.203.80 . 0.200.30H 48170 4817 H 0.140.20 0.300.70 0.150.35 3.203.80 . 0.200.30H 48200 4820 H 0.170.23 0.400.80 0.150.35 3.203.80 . 0.200.30H 50401 50B40 HC 0.370.44 0.651.10 0.150.35 . 0.300.70 .H 50441 50B44 HC 0.420.49 0.651.10 0.150.35 . 0.300.70 .H 50460 5046 H 0.430.50
24、0.651.10 0.150.35 . 0.130.43 .H 50461 50B46 HC 0.430.50 0.651.10 0.150.35 . 0.130.43 .H 50501 50B50 HC 0.470.54 0.651.10 0.150.35 . 0.300.70 .H 50601 50B60 HC 0.550.65 0.651.10 0.150.35 . 0.300.70 .H 51200 5120 H 0.170.23 0.601.00 0.150.35 . 0.601.00 .H 51300 5130 H 0.270.33 0.601.00 0.150.35 . 0.75
25、1.20 .H 51320 5132 H 0.290.35 0.500.90 0.150.35 . 0.651.10 .H 51350 5135 H 0.320.38 0.500.90 0.150.35 . 0.701.15 .H 51400 5140 H 0.370.44 0.601.00 0.150.35 . 0.601.00 .H 51450 5145 H 0.420.49 0.601.00 0.150.35 . 0.601.00 .H 51470 5147 H 0.450.52 0.601.05 0.150.35 . 0.801.25 .H 51500 5150 H 0.470.54
26、0.601.00 0.150.35 . 0.601.00 .H 51550 5155 H 0.500.60 0.601.00 0.150.35 . 0.601.00 .H 51600 5160 H 0.550.65 0.651.10 0.150.35 . 0.601.00 .H 51601 51B60HC 0.550.65 0.651.10 0.150.35 . 0.601.00 .H 61180 6118 HD 0.150.21 0.400.80 0.150.35 . 0.400.80 .H61500 6150 HE 0.470.54 0.601.00 0.150.35 . 0.751.20
27、 .H 61500 6150 HE 0.470.54 0.601.00 0.150.35 . 0.751.20 .H 81451 81B45 HC 0.420.49 0.701.05 0.150.35 0.150.45 0.300.60 0.080.15A304 1624.1.7 End-quenched hardenability (see Section 9),4.1.8 Report of heat analysis, if desired (see Section 7),4.1.9 Special straightness, if required,4.1.10 ASTM design
28、ation and date of issue,4.1.11 End use or special requirements, and4.1.12 Leaded steel, when required.TABLE 1 ContinuedUNSDesignationA Grade DesignationChemical Composition, %Carbon Manganese Silicon Nickel Chromium MolybdenumH 86170 8617 H 0.140.20 0.600.95 0.150.35 0.350.75 0.350.65 0.150.25H 8620
29、0 8620 H 0.170.23 0.600.95 0.150.35 0.350.75 0.350.65 0.150.25H 86220 8622 H 0.190.25 0.600.95 0.150.35 0.350.75 0.350.65 0.150.25H 86250 8625 H 0.220.28 0.600.95 0.150.35 0.350.75 0.350.65 0.150.25H 86270 8627 H 0.240.30 0.600.95 0.150.35 0.350.75 0.350.65 0.150.25H 86300 8630 H 0.270.33 0.600.95 0
30、.150.35 0.350.75 0.350.65 0.150.25H 86301 86B30 H 0.270.33 0.600.95 0.150.35 0.350.75 0.350.65 0.150.25H 86370 8637 H 0.340.41 0.701.05 0.150.35 0.350.75 0.350.65 0.150.25H 86400 8640 H 0.370.44 0.701.05 0.150.35 0.350.75 0.350.65 0.150.25H 86420 8642 H 0.390.46 0.701.05 0.150.35 0.350.75 0.350.65 0
31、.150.25H 86450 8645 H 0.420.49 0.701.05 0.150.35 0.350.75 0.350.65 0.150.25H 86451 86B45 HC 0.420.49 0.701.05 0.150.35 0.350.75 0.350.65 0.150.25H 86500 8650 H 0.470.54 0.701.05 0.150.35 0.350.75 0.350.65 0.150.25H 86550 8655 H 0.500.60 0.701.05 0.150.35 0.350.75 0.350.65 0.150.25H 86600 8660 H 0.55
32、0.65 0.701.05 0.150.35 0.350.75 0.350.65 0.150.25H 87200H 874008720 H8740 H0.170.230.370.440.600.950.701.050.150.350.150.350.350.750.350.750.350.650.350.650.200.300.200.30H 88220 8822 H 0.190.25 0.701.05 0.150.35 0.350.75 0.350.65 0.300.40H 92600 9260 H 0.550.65 0.651.10 1.702.20 . . .H 93100 9310 H
33、 0.070.13 0.400.70 0.150.35 2.953.55 1.001.45 0.080.15H 94151 94B15 HC 0.120.18 0.701.05 0.150.35 0.250.65 0.250.55 0.080.15H 94171 94B17 HC 0.140.20 0.701.05 0.150.35 0.250.65 0.250.55 0.080.15H 94301 94B30 HC 0.270.33 0.701.05 0.150.35 0.250.65 0.250.55 0.080.15A New designations established in ac
34、cordance with Practice E527 and SAE J 1086, Recommended Practice for Numbering Metals and Alloys (UNS).B Sulfur content range is 0.035 to 0.050 %.C These steels can be expected to have a 0.0005 % min boron content.D Vanadium content range is 0.10 to 0.15 %.E Minimum vanadium content is 0.15 %.TABLE
35、2 Chemical Requirements of Carbon H-SteelsAUNS DesignationB Grade DesignationChemical Composition, %Carbon Manganese Phosphorus,max Sulfur,max SiliconH 10380 1038 H 0.340.43 0.501.00 0.040 0.050 0.150.35H 10450 1045 H 0.420.51 0.501.00 0.040 0.050 0.150.35H 15220 1522 H 0.170.25 1.001.50 0.040 0.050
36、 0.150.35H 15240 1524 H 0.180.26 1.251.75 0.040 0.050 0.150.35H 15260 1526 H 0.210.30 1.001.50 0.040 0.050 0.150.35H 15260 1526 H 0.210.30 1.001.50 0.040 0.050 0.150.35H 15410 1541 H 0.350.45 1.251.75 0.040 0.050 0.150.35H 15211C 15B21 HC 0.170.24 0.701.20 0.040 0.050 0.150.35H 15351C 15B35 HC 0.310
37、.39 0.701.20 0.040 0.050 0.150.35H 15371C 15B37 HC 0.300.39 1.001.50 0.040 0.050 0.150.35H 15411C 15B41 HC 0.350.45 1.251.75 0.040 0.050 0.150.35H 15481C 15B48 HC 0.430.53 1.001.50 0.040 0.050 0.150.35H 15621C 15B62 HC 0.540.67 1.001.50 0.040 0.050 0.400.60Correction made editoriallyA Standard H Ste
38、els can be produced with a lead range of 0.150.35 %. Such steels are identified by inserting the letter “L” between the second and third numerals ofthe grade designation, for example, 15L22 H. Lead is generally reported as a range of 0.150.35 %.B New designations established in accordance with Pract
39、ice E527 and SAE J 1086, Recommended Practice for Numbering Metals and Alloys (UNS).C These steels can be expected to have 0.0005 % min boron content.A304 163NOTE 1A typical ordering description is as follows: 10 000 10 000 lb, alloy bars, round, 4.0 in. dia by 10 ft, Grade 1340H, J 40 56 = 616 in.,
40、 heatanalysis required, ASTM A304, dated _, worm gear.4.2 The purchaser shall specify the desired grade, including the suffix letter “H,” in accordance with Table 1 or Table 2.4.3 Band limits are shown graphically and as tabulations in Figs. 2-87, inclusive. For specifications purposes, the tabulate
41、dvalues of Rockwell C hardness are used. Values below 20 Rockwell C hardness (20 HRC) are not specified because such valuesare below the normal range of the C scale. The graphs are shown for convenience in estimating the hardness values obtainable atvarious locations on the end quench test bar and f
42、or various locations in oil or water quenched rounds. The relationship betweenend-quench distance and bar diameter is approximate and should be used only as a guide.4.4 Two points from the tabulated values are commonly designated according to one of Methods A, B, C, D, or E, which aredefined in the
43、following paragraphs. Those various methods are illustrated graphically in Fig. 1.4.4.1 Method AThe minimum and maximum hardness values at any desired distance. This method is illustrated in Fig. 1 aspoints A-A and would be specified as 43 to 54 HRC at J3. Obviously the distance selected would be th
44、at distance on the end quenchtest bar that corresponds to the section used by the purchaser.4.4.2 Method BThe minimum and maximum distances at which any desired hardness value occurs. This method is illustratedin Fig. 1 as points B-B and would be specified as 39 HRC at J4 minimum and J9 maximum. If
45、the desired hardness does not fallon an exact sixteenth position, the minimum distance selected should be the nearest sixteenth position toward the quenched endand the maximum should be the nearest sixteenth position away from the quenched end.Method Points onChartsExampleEnd QuenchHardenabilityA Mi
46、nimum and maximum hardness values at a designated distance A-A HRC 43 to 54 at J3B A hardness value at minimum and maximum distances B-B HRC 39 at J4 minimum and J9 maximumC The maximum hardness values at two designated distances C-C HRC50 at J5 maximumHRC 34 at J12 maximumD Two minimum hardness val
47、ues at two distances D-D HRC 35 at J5 minimumHRC 21 at J16 minimumE Any minimum hardness plus any maximum hardness E-E HRC 32 at J6 minimumHRC 37 at J10 maximumFIG. 1 Examples Illustrating Alternative Method of Specifying Hardenability Requirements(tabulated hardness values are used in ordering)A304
48、 1644.4.3 Method CTwo maximum hardness values at two desired distances, illustrated in Fig. 1 as points C-C.4.4.4 Method DTwo minimum hardness values at two desired distances, illustrated in Fig. 1 as points D-D.4.4.5 Method EAny minimum hardness plus any maximum hardness.4.4.6 Method EAny minimum hardness plus any maximum hardness. When hardenability is specified according to one of theabove Methods A to E, the balance of the hardenabil
