15B48H

SAE J1268 MAY2010: Table 1 of the official English original, ladle analysis, mass fraction wt%, for H steels with specified hardenability bands. Note 1 to Table 1: when electric-furnace steelmaking is specified or required, add the E prefix to the grade; each of P/S is ≤.025%. Keep these separate from ordinary H grades. Note 2 to Table 1: boron steels, B .0005–.003%. Do not assign J403/J404 values to unlisted residual alloy elements; unspecified does not mean zero. The permitted composition ranges for H steels are intended to meet the hardenability band and are not merged with same-name grades without H. Product-analysis tolerances require separate verification under Table 1/3 of SAE J409. Hardenability curves, grain size, delivery conditions and cold-heading supply require separate verification. Original Table 1 explicitly associates SAE 15B48H with UNS H15481; this is a search-name relationship within that edition only.

ASTM A304—2020 Tables 1 and 2 and 7.1 specify ladle analysis, mass fraction (wt%); this is an excerpt from the published edition, not verification of the complete standard. The scope is hot-worked carbon, alloy and carbon-boron steel bars with hardenability requirements; the H suffix must not be omitted or treated automatically as an ordinary grade. Product-analysis tolerances in Table 1 note 3 must be checked separately against A29/A29M; tolerances and hardenability bands were not reproduced here, and composition alone does not establish compliance with all H-steel requirements. Unlisted elements are not zero; residual-element maxima not specified in Table 1 note 2 are included for the applicable elements. Table 1 note 2 is not automatically applied to Table 2. A leaded variant requires the separate L designation in the source; Pb 0.15–0.35% has not been added to ordinary H grades. The boron-steel footnote states an expected minimum boron content of 0.0005%; it is listed separately and is not presented as a composition acceptance limit. Chemistry outside this table requires agreement between purchaser and supplier. Inclusion in the standard-material database does not establish cold-heading supply capability or direct substitutability; processing and supply conditions must be confirmed separately.

China Steel bar and wire-rod catalogue CAT.NO.3-BD-01-2014-C1, PDF page 24

printed page 22, 7.1.18 SAE carbon/boron H steels (edition not stated). The original catalogue does not explicitly identify the analysis type for this table. Historical manufacturer range data, not guaranteed standard limits or heat-specific measurements; this does not establish supply by Creation Group.