G40.20-04/G40.21-04 (R2009)
General requirements for rolled or welded structural quality steel/ Structural quality steel
Product Details
Preface
This is the sixth edition of CSA G40.20/G40.21, General requirements for rolled or welded structural quality steel/Structural quality steel. It supersedes previous editions published in 1998, 1992, 1987, 1981, and 1978.
This edition comprises amendments published in General Instruction No. 2 to the previous edition, corrections of errata, and new amendments approved by the Technical Committee on Structural Steel.
These include
(a) a change in the location of tensile test samples from the web to the flange on W, HP, S, and M shapes;
(b) the adoption of CAN/CSA-G40.23 for assessment of the surface quality of plate;
(c) the acceptance under G40.20/G40.21 of products manufactured in conformance with ASTM A 992/A 992M, Structural Steel Shapes;
(d) the addition of requirements for cold-formed Z sections;
(e) revisions to the permissible variations in the dimensions of cold-formed channels; and
(f) the addition of Table 11, which provides the dimensions and mass (weight) of commonly available structural shapes and hollow structural sections, replacing and updating information in CAN/CSA-G312.3-M, Metric Dimensions for Structural Steel Shapes and Hollow Structural Sections (withdrawn in 2001).
These Standards are written in SI (metric) units, with yard/pound units included in parentheses. The SI units are in conformance with CSA Z234.1, Metric Practice Guide.
While the technical requirements of the metric and yard/pound versions are virtually the same, some differences do occur. Either the SI or the yard/pound units must be used, and any attempt to intermingle the two systems of units on any specific purchase of material may result in nonconformance with the Standards.
These Standards have been harmonized to the maximum possible extent with equivalent ASTM Standards A 6/A 6M and A 568/A 568M.
These Standards were prepared by the Technical Committee on Structural Steel, under the jurisdiction of the Strategic Steering Committee on Welding and Structural Metals, and have been formally approved by the Technical Committee.
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G40.20-04 - General requirements for rolled or welded structural quality steel
Scope
1.1
This Standard outlines the requirements that apply, unless otherwise specified in a purchase order or individual standard, to structural quality steel plates, shapes, sheet, sheet piling, cold-formed channels, hollow sections, Z sections, and bars conforming to the requirements of CSA G40.21.
Tables 11(a) to (h) of CSA G40.21 provide information on the dimensions and mass (weight) per unit length of structural shapes and sections commonly used in the construction of steel buildings and bridges.
1.2
In CSA Standards, shall is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; should is used to express a recommendation or that which is advised but not required; and may is used to express an option or that which is permissible within the limits of the standard.
Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Legends to equations and figures are considered requirements.
1.3
The values stated in either SI (metric) or yard/pound units are to be regarded as standard. Within the text, the yard/pound units are shown in parentheses. The values stated in each system are not exact equivalents; each system must be used independently. Combining values from the two systems can result in nonconformance with this Standard.
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G40.21-04 - Structural quality steel
Scope
1.1
This Standard covers structural quality steel plates, shapes, hollow sections, sheet, sheet piling, cold-formed channels, Z sections, and bars for general construction and engineering purposes.
1.2
A number of strength levels are available under this Standard and are designated by the minimum yield strength in MPa (ksi). The common grades, types, and strength levels are shown in Table 1. Charpy V-notch categories are shown in Table 9. The purchaser specifies the grade and, if applicable, the category.
1.3
The following types of steel are covered by this Standard:
(a) Type W - Weldable Steel
Steels of this type meet specified strength requirements and are suitable for general welded construction where notch toughness at low temperatures is not a design requirement. Applications include buildings, compression members of bridges, etc.
(b) Type WT - Weldable Notch-Tough Steel
Steels of this type meet specified strength and Charpy V-notch impact requirements and are suitable for welded construction where notch toughness at low temperature is a design requirement. The purchaser, in addition to specifying the grade, specifies the required category of steel that establishes the Charpy V-notch test temperature and energy level. Applications include primary tension members in bridges and similar elements.
(c) Type R - Atmospheric Corrosion-Resistant Steel
Steels of this type meet specified strength requirements. The atmospheric corrosion resistance of these steels in most environments is substantially better than that of carbon structural steels with or without a copper addition.* These steels are welded readily up to the maximum thickness covered by this Standard. Applications include unpainted siding, unpainted light structural members, etc., where notch toughness at low temperature is not a design requirement.
*For methods of estimating the atmospheric corrosion resistance of low-alloy steels, see Clause 7.6. When properly exposed to the atmosphere, these steels can be used bare (unpainted) for many applications.
(d) Type A - Atmospheric Corrosion-Resistant Weldable Steel Steels of this type meet specified strength requirements. The atmospheric corrosion resistance of these steels in most environments is substantially better than that of carbon structural steels with or without a copper addition.* These steels are suitable for welded construction where notch toughness at low temperature is not a design requirement. Applications include those similar to Type W steel.
*For methods of estimating the atmospheric corrosion resistance of low-alloy steels, see Clause 7.6. When properly exposed to the atmosphere, these steels can be used bare (unpainted) for many applications.
(e) Type AT - Atmospheric Corrosion-Resistant Weldable Notch-Tough Steel
Steels of this type meet specified strength and Charpy V-notch impact requirements. The atmospheric corrosion resistance of these steels in most environments is substantially better than that of carbon structural steels with or without a copper addition.* These steels are suitable for welded construction where notch toughness at low temperature is a design requirement. The purchaser, in addition to specifying the grade, specifies the required category of steel that establishes the Charpy V-notch test temperature and energy level. Applications include primary tension members in bridges and similar elements.
*For methods of estimating the atmospheric corrosion resistance of low-alloy steels, see Clause 7.6. When properly exposed to the atmosphere, these steels can be used bare (unpainted) for many applications.
(f) Type Q - Quenched and Tempered Low-Alloy Steel Plate
Steels of this type meet specified strength requirements. While these steels are weldable, the welding and fabrication techniques are of fundamental importance to the properties of the plate, especially the heat-affected zone. Applications include bridges and similar structures.
(g) Type QT - Quenched and Tempered Low-Alloy Notch-Tough Steel Plate
Steels of this type meet specified strength and Charpy V-notch impact requirements. They provide good resistance to brittle fracture and are suitable for structures where notch toughness at low temperature is a design requirement. The purchaser, in addition to specifying the grade, specifies the required category of steel that establishes the Charpy V-notch test temperature and energy level. While these steels are weldable, the welding and fabrication techniques are of fundamental importance to the properties of the plate, especially the heat-affected zone. Applications include primary tension members in bridges and similar elements.
1.4
In CSA Standards, shall is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; should is used to express a recommendation or that which is advised but not required; and may is used to express an option or that which is permissible within the limits of the standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.Notes to tables and figures are considered part of the table or figure and may be written as requirements. Legends to equations and figures are considered requirements.
1.5
The values stated in either SI (metric) or yard/pound units are to be regarded as standard. Within the text, the yard/pound units are shown in parentheses. The values stated in each system are not exact equivalents; each system must be used independently. Combining values from the two systems can result in nonconformance with this Standard.
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