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1.1 This specification covers high-strength low-alloy structural steel plate intended for use in welded construction of naval ships where a savings in weight is important. Steels that conform to this specification offer improved weldability, formability, and toughness resulting from the specified alloying elements with limitations on carbon, sulfur, and residual element contents. Two grades, 50 and 65, may be provided as-rolled, control-rolled, thermo-mechanical control processed (including accelerated cooling), normalized, or quenched and tempered as required to meet the specified mechanical requirements.
1.2 The maximum thickness or weight [mass] of plates shall be as follows:
|Grade||Plate thickness, max, in. [mm]||Plate weight [mass], max, lb/ft2 [kg/m2]|
|50||2 ||81.7 |
|65||11/4 ||51.0 |
1.3 When the steel is to be welded, it is presupposed that a welding procedure suitable for the grade of steel and intended use or service will be utilized.
1.4 The values stated in either inch-pound units or SI units are to be regarded as standard. Within the text the SI units are shown in brackets. The values stated in each system are not exact equivalents, therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with this specification.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A6/A6M Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A673/A673M Specification for Sampling Procedure for Impact Testing of Structural Steel
A700 Practices for Packaging, Marking, and Loading Methods for Steel Products for Shipment
E208 Test Method for Conducting Drop-Weight Test to Determine Nil-Ductility Transition Temperature of Ferritic Steels
ICS Number Code 47.020.05 (Materials and components for shipbuilding)
UNSPSC Code 30102204(Steel plate)