ASTM A304-11 PDF

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-SteelsA

UNS DesignationB
Grade Designation
Chemical Composition, %
Carbon
Manganese
Phosphorus,
max
Sulfur,
max
Silicon
H 10380 1038 H0.34-0.430.50-1.00 0.0400.0500.15-0.35 H 10450 1045 H0.42-0.510.50-1.00 0.0400.0500.15-0.35 H 15220 1522 H0.17-0.251.00-1.50 0.0400.0500.15-0.35 H 15240 1524 H0.18-0.261.25-1.75 0.0400.0500.15-0.35 H 15260 1526 H†0.21-0.301.00-1.50 0.0400.0500.15-0.35 H 15410 1541 H0.35-0.451.25-1.75 0.0400.0500.15-0.35 H 15211C15B21 HC0.17-0.24 0.70-1.200.0400.050 0.15-0.35 H 15351C15B35 HC0.31-0.39 0.70-1.200.0400.050 0.15-0.35 H 15371C15B37 HC0.30-0.39 1.00-1.500.0400.050 0.15-0.35 H 15411C15B41 HC0.35-0.45 1.25-1.750.0400.050 0.15-0.35 H 15481C15B48 HC0.43-0.53 1.00-1.500.0400.050 0.15-0.35 H 15621C15B62 HC0.54-0.67 1.00-1.500.0400.050 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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Published :	10/01/2011
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