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Description / Abstract: This specification covers the requirements for low carbon continuouscast steel for exposed andunexposed applications and is applicable to all low carbon steel sheetproducts and coatedsubstrates.
Continuously hot or cold rolled flat products shall be supplied ascoils or sheet. Hot rolled flatproducts are usually supplied in thicknesses 1.75 mm. These flatproducts are used for coldforming and for manufacturing of welded tubes. Cold rolled flatproducts with the appropriatesurface type and surface finish are suitable for the application ofsurface coatings (metallicplating by melt dipping or thermal spray painting, electrolyticplating, organic coating and/orother coatings). This specification does not apply to steel for casehardening or stripapplications. Additional requirements or agreements shall be specifiedby local business units(e.g., GMNA, Opel ITDC, GM do Brazil, Holden Ltd., Fiat, etc.).
Material Description. The material designation is defined by the GMWbase metal specificationnumber, steel product type and steel grade. The steel product type isdesignated by CR for coldrolled products, or HR for hot rolled products. A numeral (1, 2, 3,etc.) will designate the steelgrade formability level. The steel grade will correspond to thechemical and mechanicalrequirements as shown in Table1, Table 2 and Table 3. A third suffix(C) may be added after thesteel grade to designate a low carbon steelmaking practice. The finishtype, an alpha character,will designate the finish as E (exposed), or U (unexposed). Inaddition, products which are notcoated shall have the word "uncoated" added to the call-out after thesteel type, but before thefinish designation. The above descriptive items are used together toform the coding system.Examples of the coding system for engineering part drawings andmanufacturing engineering documentsare shown in paragraph 7.
Continuously hot or cold rolled flat products shall be supplied ascoils or sheet. Hot rolled flatproducts are usually supplied in thicknesses 1.75 mm. These flatproducts are used for coldforming and for manufacturing of welded tubes. Cold rolled flatproducts with the appropriatesurface type and surface finish are suitable for the application ofsurface coatings (metallicplating by melt dipping or thermal spray painting, electrolyticplating, organic coating and/orother coatings). This specification does not apply to steel for casehardening or stripapplications. Additional requirements or agreements shall be specifiedby local business units(e.g., GMNA, Opel ITDC, GM do Brazil, Holden Ltd., Fiat, etc.).
Material Description. The material designation is defined by the GMWbase metal specificationnumber, steel product type and steel grade. The steel product type isdesignated by CR for coldrolled products, or HR for hot rolled products. A numeral (1, 2, 3,etc.) will designate the steelgrade formability level. The steel grade will correspond to thechemical and mechanicalrequirements as shown in Table1, Table 2 and Table 3. A third suffix(C) may be added after thesteel grade to designate a low carbon steelmaking practice. The finishtype, an alpha character,will designate the finish as E (exposed), or U (unexposed). Inaddition, products which are notcoated shall have the word "uncoated" added to the call-out after thesteel type, but before thefinish designation. The above descriptive items are used together toform the coding system.Examples of the coding system for engineering part drawings andmanufacturing engineering documentsare shown in paragraph 7.