Standard Specification for Carbon and Alloy Steel Bars Subject to End-Quench Hardenability Requirements

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Superseded date

11-11-2014

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English

Published date

01-10-2011

Publisher

American Society for Testing and Materials

Committee	A 01
DocumentType	Standard
Pages	48
PublisherName	American Society for Testing and Materials
Status	Superseded
SupersededBy	ASTM A 304 : 2016
Supersedes	ASTM A 304 : 2005 : R2011

1.1 This specification covers hot-worked alloy, carbon, and carbon-boron steels in a variety of compositions and sizes, which may attain specified depth of hardening in the end quench test. These steel compositions are identified by the suffix letter “H” added to the conventional grade number.

1.2 This specification provides for analyses other than those listed under Tables 1 and 2. Special hardenability limits are also permissible 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 this standard.

TABLE 2 Chemical Requirements of Carbon H-Steels^A


UNS Designation^B	Grade Designation	Chemical Composition, %
UNS Designation^B	Grade Designation	Carbon	Manganese	Phosphorus, max	Sulfur, max	Silicon

H 10380	1038 H	0.34–0.43	0.50–1.00	0.040	0.050	0.15–0.35
H 10450	1045 H	0.42–0.51	0.50–1.00	0.040	0.050	0.15–0.35
H 15220	1522 H	0.17–0.25	1.00–1.50	0.040	0.050	0.15–0.35
H 15240	1524 H	0.18–0.26	1.25–1.75	0.040	0.050	0.15–0.35
H 15260	1526 H†	0.21–0.30	1.00–1.50	0.040	0.050	0.15–0.35
H 15410	1541 H	0.35–0.45	1.25–1.75	0.040	0.050	0.15–0.35

H 15211^C	15B21 H^C	0.17–0.24	0.70–1.20	0.040	0.050	0.15–0.35
H 15351^C	15B35 H^C	0.31–0.39	0.70–1.20	0.040	0.050	0.15–0.35
H 15371^C	15B37 H^C	0.30–0.39	1.00–1.50	0.040	0.050	0.15–0.35
H 15411^C	15B41 H^C	0.35–0.45	1.25–1.75	0.040	0.050	0.15–0.35
H 15481^C	15B48 H^C	0.43–0.53	1.00–1.50	0.040	0.050	0.15–0.35
H 15621^C	15B62 H^C	0.54–0.67	1.00–1.50	0.040	0.050	0.40–0.60
†Correction made editorially

^A Standard H Steels can be produced with a lead range of 0.15–0.35 %. Such steels are identified by inserting the letter “L” between the second and third numerals of the grade designation, for example, 15L22 H. Lead is generally reported as a range of 0.15–0.35 %.

^B New designations established in accordance with Practice 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.

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ASTM A 304 : 2011

Standard Specification for Carbon and Alloy Steel Bars Subject to End-Quench Hardenability Requirements

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