GMW GMW2 Low Carbon Sheet Steel

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GMW GMW2 Document Information:

Title
Low Carbon Sheet Steel

GM Worldwide

Publication Date:
Apr 1, 2004

Scope:

This specification covers the requirements for low carbon continuous cast steel for exposed and unexposed applications and is applicable to all low carbon steel sheet products and coated substrates.

Continuously hot or cold rolled flat products shall be supplied as coils or sheet. Hot rolled flat products are usually supplied in thicknesses > 1.75 mm. These flat products are used for cold forming and for manufacturing of welded tubes. Cold rolled flat products with the appropriate surface type and surface finish are suitable for the application of surface coatings (metallic plating by melt dipping or thermal spray painting, electrolytic plating, organic coating and/or other coatings). This specification does not apply to steel for case hardening or strip applications. Additional requirements or agreements shall be specified by local business units (e.g., GMNA, Opel ITDC, GM do Brazil, Holden Ltd., Fiat, etc.).

Material Description. The material designation is defined by the 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 Table1, 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 paragraph 7.

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