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Grade 100ksi 05x120x480 steel plate front view.
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CSA G40.21 100QT Structural Steel Plate

CSA G40.21 100QT steel plate is a quenched and tempered low-alloy structural steel plate with notch toughness requirements. Also referred to as 700QT, this high-strength CSA grade is used for demanding structural applications that require 100 ksi minimum yield strength and verified impact toughness.

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Features

  • Minimum yield strength of 100 ksi, or approximately 700 MPa.

  • Used in demanding structural applications requiring high strength and toughness.

  • May be certified to meet multiple standards on mill test reports, but guaranteed to meet CSA G40.21 standards.

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Product Details

Grade Thickness Width Length
CSA G40.21 100QT 1/4" – 4" 48" – 120" Up to 480"
Thickness Range Yield Point (ksi) Tensile Strength (ksi) Min. 2” Elongation %
100QT ≤2.5" 100 110-130 18
100QT >2.5" 90 110-130 18
Carbon max 0.20%
Manganese max 1.50%
Phosphorus max 0.030%
Sulfur max 0.040%
Silicon 0.15-0.40%
Boron 0.0005-0.005%

Grade Comparison

Frequently Asked Questions

Learn more about CSA G40.21 100QT steel plate.
CSA G40.21 100QT steel plate is used in demanding structural applications that require high-strength, quenched and tempered low-alloy steel with notch toughness requirements. With a 100 ksi minimum yield strength, 100QT is typically selected for structural components where high load-bearing performance and verified toughness are important.
In CSA G40.21 steel plate, 100QT is the imperial designation and 700QT is the metric designation. The number refers to minimum yield strength, with 100QT indicating 100 ksi and 700QT indicating approximately 700 MPa. The “QT” indicates quenched and tempered low-alloy notch-tough steel plate.
CSA 100Q and CSA 100QT are both quenched and tempered low-alloy steel plate grades under CSA G40.21, but 100QT includes notch toughness requirements. In CSA grade terminology, “Q” indicates quenched and tempered low-alloy steel plate, while “QT” indicates quenched and tempered low-alloy notch-tough steel plate. CSA 100QT should be specified when the project requires both high strength and impact toughness performance.
CSA 100QT steel plate is quenched and tempered to achieve high yield strength and toughness for demanding structural applications. This heat treatment helps the steel reach its 100 ksi minimum yield strength while supporting the notch toughness requirements associated with the QT designation.
Yes. CSA G40.21 100QT requires impact testing as part of the CSA test schedule, along with chemical composition and tensile testing. This is what separates 100QT from 100Q, which is quenched and tempered but does not include the same notch-tough designation.
CSA G40.21 100QT and ASTM A514 are often compared because both are high-strength quenched and tempered structural steel plate grades with 100 ksi-level yield strength. However, CSA 100QT is produced to Canadian Standards Association requirements, while A514 is produced to ASTM requirements. Substitution or multi-certification should be confirmed against the project specification, mechanical properties, chemistry, toughness requirements and MTR details.