ASTM A304-11

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 DesignationB	Grade Designation	Chemical Composition, %
		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 15211C	15B21 HC	0.17–0.24	0.70–1.20	0.040	0.050	0.15–0.35
H 15351C	15B35 HC	0.31–0.39	0.70–1.20	0.040	0.050	0.15–0.35
H 15371C	15B37 HC	0.30–0.39	1.00–1.50	0.040	0.050	0.15–0.35
H 15411C	15B41 HC	0.35–0.45	1.25–1.75	0.040	0.050	0.15–0.35
H 15481C	15B48 HC	0.43–0.53	1.00–1.50	0.040	0.050	0.15–0.35
H 15621C	15B62 HC	0.54–0.67	1.00–1.50	0.040	0.050	0.40–0.60
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