ASTM A945/A945M-16 (R2021) pdf free download.Standard Specification for High-Strength Low-Alloy Structural Steel Plate with Low Carbon and Restricted Sulfur for Improved Weldability,Formability, and Toughness.
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 [massi is important. Plates that conform to this specification oiler improved weldability, formability, and toughness resulting from the specified alloying elements with limitations on carbon, sulfur, and residual element contents. Grades 50 and 65 may he 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:
3. General Requirements for Delivery
3.1 Plates furnished under this specification shall conform to the applicable requirements of the current edition of Specification A6/A6M.
3.2 If specified in the purchase order, plates ordered under this specification shall be prepared for shipment in accordance with the requirements of the current edition of Guide A700.
4. Materials and Manufacture
4.1 The steel shall be made to fine grain practice.
4.2 Grade 65 plates less than 1 in. 125 in thickness shall be provided from continuously cast product.
4.3 Except as specified in 5.1 and 5.2, the plates after finish-rolling shall be in one of the following conditions:
as-rolled, control-rolled, or thermo-mechan ical control processed (including accelerated cooling).
6. Chemical Composition
6.1 The heat analysis shall confonn to the requirements given in Table 1.
6.2 If a product analysis is made, it shall conform to the requirements given in Table 1, subject to the product analysis tolerances in Specification A6/A6M.
7. Mechanical Properties
7. 1 Tensile Properties:
7.1.1 The plates as represented by the test specimens shall conform to the tensile properties given in Table 2 for the applicable grade.
7.1.2 For quenched and tempered plates. one tension test shall be taken from a corner of each plate as heat treated.
7.1.3 If measured on a 1 ½-in. [40-mm] wide specimen (see Fig. 3 of Test Methods and Definitions A370), the elongation may be determined in a 2-in. [50-mm] gauge length that includes the fracture and shows the greatest elongation.
7.2 Charpy V-Notch impact Properties.
7.2.1 Except as allowed by section 7.2.2, Charpy V-Notch impact tests shall be conducted in accordance with Specification A673/A673M. All plates shall be tested in accordance with frequency (P) Piece Testing.
7.2.2 The plates as represented by the test specimens shall conform to the impact properties given in Table 3 for the applicable grade. For Grade 50. the longitudinal axis of the specimens may be parallel or transverse to the final direction of rolling of the plate at the option of the manufacturer, unless the test orientation is specified in the purchase order.
7.2.3 For material thicknesses below in. [10 mm]. the absorbed energy in Table 3 shall he reduced proportionally in accordance with Table 1 in Specification A673/A673M for sub-sized Charpy test specimens.ASTM A945/A945M pdf download.