1.1 本规范涵盖高温用热加工和冷加工马氏体铬钢筋。如每种合金所示，通过适当的热处理来提高机械性能。 1.2 如果温度下的强度是一个因素，这些钢通常被限制在1200°F[650°C]的最高使用温度。对于抗氧化（结垢）和低应力，这些钢在1450°F[790°C]下有用。 1.3 本规范以英寸-磅单位和国际单位制表示；但是，除非采购订单或合同规定了适用的 M 规范名称（国际单位制），英寸-磅单位应适用。以英寸-磅单位或国际单位表示的数值应单独视为标准值。在文本中，国际单位显示在括号中。 每个系统中规定的值可能不是精确的等效值；因此，每个系统应相互独立使用。合并两个系统的值可能会导致不符合规范。

1.1 This specification covers hot-finished and cold-finished martensitic chromium steel bars for high-temperature service. The mechanical properties are developed by suitable heat treatment, as indicated for each alloy. 1.2 Where strength at temperature is a factor, these steels are generally limited to a maximum service temperature of 1200°F [650°C]. For oxidation (scaling) resistance and at low stresses, these steels are useful to 1450°F [790°C]. 1.3 This specification is expressed in both inch-pound units and SI units; however, unless the purchase order or contract specifies the applicable M specification designation (SI units), the inch-pound units shall apply. The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.