This SAE Recommended Practice covers two levels of high strength structural low-alloy steel bars having minimum Yield Points of 345 MPa (50 ksi) and 450 MPa (65 ksi).
The two strength levels are 345 and 450 MPa or 50 and 65 ksi minimum yield point. Different chemical compositions are used to achieve the specified mechanical properties. In some cases there are significant differences in chemical composition for the same strength level, depending on the fabricating requirements.
It should be noted that although the mechanical properties for a steel grade sourced from different suppliers may be the same, the chemical composition may vary significantly. The fabricator should be aware that certain compositional differences may effect the forming, welding, and/or service requirements of the material. It is therefore recommended that the fabricator consult with the producer to understand the effect of chemical composition.
The products within the scope of this document include bars of the following types and sizes:
Rounds, squares, and hexagons of all sizes (cut length only), flats 5.2 mm (0.203 in) and greater in thickness but not greater than 150 mm (6 in) wide, and flats greater than 5.8 mm (0.229 in) thick and over 150 mm (6 in) to 204 mm (8 in) wide.
This document previously covered plates, structural shapes, and bar size shapes of Grades 290A, 345A, 415A, 450A, 345W, 345F, 415F, 485F, and 550F as well as bars of Grades 290A, 415A, and 345W. These products are no longer covered; requirements for these products and grades can be found in ASTM Specifications as follows in Table 1:
Product
Previous SAE Grade
ASTM Specification/Grade
Plates, Structural Shapes, Bar Size Shapes, Bars
290A
A 572/A 572M, Grade 42
Plates, Structural Shapes, Bar Size Shapes
345A
A 572/A 572M, Grade 50
Plates, Structural Shapes, Bar Size Shapes, Bars
415A
A 572/A 572M, Grade 60
Plates, Structural Shapes, Bar Size Shapes
450A
A 57/A 572M, Grade 65
Plates, Structural Shapes, Bar Size Shapes, Bars
345W
A 588/A 588M
Plates
345F
A 656/A 656M, Grade 50
Plates
415F
A 656/A 656M, Grade 60
Plates
485F
A 656/A 656M, Grade 70
Plates
550F
A 656/A 656M, Grade 80
TABLE 1EQUIVALENT ASTM SPECIFICATIONS
Rationale
This document has been revised to cover two grades of high-strength low-alloy steel bars having minimum yield points of 345 MPa (50 ksi) and 450 MPa (65 ksi) respectively. Other products previously covered by this document (plates, structural shapes and bar shapes) are covered by ASTM specifications.
The Metals Technical Committee (MTC) controls specifications for Ferrous and Non-Ferrous: Metallic Wrought Products, Cast & Sintered Products, Metal Properties & Processes, and Metal Test Procedures. The MTC oversees standards to establish uniform procedures that: 1) establish a common language for the industry to review materials and processes through standards, 2) are reviewed and updated on a regular 5-year basis with coordination to other industry specifications, and 3) creates a common industry interface for technical discussions. The MTC ensures that all standards are developed with qualified personnel to perform respective tasks, meets at least once a year to provide relevant updates to current specifications, and assesses whether new standards are needed by industry. The committee also maintains the public web pages by reviewing and updating the information necessary. The MTC shall report to the Materials Processes and Parts Council (MPPC) on a biannual basis. Participants in the SAE Metals Technical Committee include representatives from OEMs, suppliers, consulting firms, government, and other interested parties.
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