1.1 本规范涵盖铸造碳素钢和合金钢锭和铸坯、半锻钢锭和铸坯，以及用于锻造的轧制或锻造钢坯、钢坯和板坯。 1.2 初轧坯、钢坯和板坯是热轧或锻造至近似横截面尺寸的半成品钢。初轧坯和钢坯的截面可以是方形、圆形、八角形或矩形；板为矩形。尽管钢坯和钢坯之间没有不变的规则，并且经常互换使用，但通常使用以下尺寸差异。 1.2.1 开花- 横截面积大于36英寸。 2. [230厘米 2. ]. 1.2.2 钢坯- 最大横截面积36英寸。 2. [230 厘米 2. ]. 1.2.3 楼板- 最小厚度，1 1. / 2. 在里面[4厘米]；宽度，大于厚度的两倍；通常横截面积不小于16英寸。 2. [100厘米 2. ]. 1.2.4 覆盖顶部或底部浇注或二次重熔的钢锭。 1.2.5 包括带或不带额外压下量的铸坯。 1.3 提供了可选性质的补充要求（S1至S19）。仅当买方指定时，其才适用。 1.4 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值不一定是精确的等价物；因此，为确保符合本标准，每个系统应独立使用，且两个系统的值不得组合。 1.5 除非订单规定了“M”规格，否则材料应以英寸-磅为单位提供。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。

1.1 This specification covers cast carbon and alloy steel ingots and strand castings, semi-wrought ingots and strand castings and rolled or forged blooms, billets, and slabs for forging. 1.2 Blooms, billets, and slabs are semi-finished steel products, hot rolled or forged to approximate cross-sectional dimensions. Blooms and billets may be square, round, octagonal, or rectangular in section; slabs are rectangular. Although no invariable rule prevails between the terms blooms and billets, and they are frequently used interchangeably, the following size distinctions are in general use. 1.2.1 Blooms— Cross-sectional area greater than 36 in. 2 [230 cm 2 ]. 1.2.2 Billets— Maximum cross-sectional area 36 in. 2 [230 cm 2 ]. 1.2.3 Slabs— Minimum thickness, 1 1 / 2 in. [4 cm]; width, more than twice the thickness; and generally a cross-sectional area of not less than 16 in. 2 [100 cm 2 ]. 1.2.4 Ingots either top or bottom poured or secondary remelted are covered. 1.2.5 Strand castings with or without additional reduction are covered. 1.3 Supplementary Requirements (S1 to S19) of an optional nature are provided. They shall apply only when specified by the purchaser. 1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.5 Unless the order specifies the “M” specification, the material shall be furnished to the inch-pound units. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.