AASHTO M 103M/M 103-19涵盖了要求最低抗拉强度高达485 MPa[70 ksi]的一般应用的碳钢铸件。注:本规范涵盖的等级代表适用于通过熔焊与其他铸钢件或锻钢零件组装的材料。这并不意味着所有这些等级都具有相同的可焊性，或者所有铸件都可以使用相同的焊接技术。买方有责任自行制定合适的焊接技术。包括几个等级和两个等级的铸钢件。所需的等级和等级应由买方规定。

This specification covers carbon steel castings for general applications that require up to 485 MPa [70 ksi] minimum tensile strength.The grades covered by this specification represent materials that are suitable for assembly with other steel castings or wrought steel parts by fusion welding. It is not intended to imply that all these grades possess the same degree of weldability or that the same welding techniques can be used on all castings. It is the responsibility of the purchaser to establish for himself a suitable welding technique.Several grades and two classes of steel castings are covered. The grade and class desired shall be specified by the purchaser.This specification is applicable to orders in either SI units (as M 103M) or inch-pound units (as M 103). The values stated in either SI units or inch-pound units are to be regarded separately as standard. 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 standard. Inch-pound units are shown in brackets in the text for clarity, but they are the applicable values when the material is ordered to M 103.