GMW GMW2 Low Carbon Sheet Steel
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GMW GMW2 Document Information:
Title
Low Carbon Sheet Steel
GM Worldwide
Publication Date:
Jan 1, 2008
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
regional GM Automotive Operations (GM) business units [e.g., North
America (GMNA), Europe (GME), Latin America (GMLAAM), and Asia
Pacific (GMAP)].
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 Table 1, 2
and 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 8.
Typical Applications.
Sheet metal parts consisting of low carbon steel products and
coated low carbon steel substrates.
Remarks.
Not applicable.
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