GMW2
GMW2 - Revision / Edition: 8 Chg: Date: 10/00/12 LOW CARBON SHEET STEEL
Material Description. The material designation is defined by the General Motors Worldwide (GMW) base metal specification number, steel product type and steel grade. The steel product type is designated by "CR" for cold rolled products, or "HR" for hot rolled products. A numeral (1, 2, 3, etc.) will designate the steel grade formability level. The steel grade will correspond to the chemical and mechanical requirements as shown in Table 1, Table 2, and Table 3. A third suffix (C) may be added after the steel grade to designate a low carbon steelmaking practice. The finish type, an alpha character, will designate the finish as E (exposed), or U (unexposed). In addition, products which are not coated shall have the word uncoated added to the call-out after the steel type, but before the finish designation. The above descriptive items are used together to form the coding system. Examples of the coding system for engineering part drawings and manufacturing engineering documents are shown in Section 8.
Typical Applications. Sheet metal parts consisting of low carbon steel products and coated low carbon steel substrates.