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). SI units and inch-pound units are not necessarily equivalent. 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.