ASTM A945/A945M-00

Standard Specification for High-Strength Low-Alloy Structural Steel Plate with Low Carbon and Restricted Sulfur for Improved Weldability, Formability, and Toughness

SCOPE
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 [50] 81.7 [393] 65 11/4 [32]51.0 [251]  
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.

General Information

• Status: Historical
• Publication Date: 09-Sep-2000
• ICS: 47.020.05 - Materials and components for shipbuilding
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.02 - Structural Steel for Bridges, Buildings, Rolling Stock and Ships

Relations

• Replaced By: ASTM A945/A945M-05 - Standard Specification for High-Strength Low-Alloy Structural Steel Plate with Low Carbon and Restricted Sulfur for Improved Weldability, Formability, and Toughness
• Effective Date: 01-Sep-2005
• Referred By: ASTM A1065/A1065M-18 - Standard Specification for Cold-Formed Electric-Fusion (Arc) Welded High-Strength Low–Alloy Structural Tubing in Shapes, with 50 ksi [345 MPa] Minimum Yield Point
• Effective Date: 10-Sep-2000

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: A 945/A 945M – 00
Standard Specification for
High-Strength Low-Alloy Structural Steel Plate with Low
Carbon and Restricted Sulfur for Improved Weldability,
Formability, and Toughness
ThisstandardisissuedunderthefixeddesignationA 945/A 945M;thenumberimmediatelyfollowingthedesignationindicatestheyear
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope A 370 TestMethodsandDefinitionsforMechanicalTesting
of Steel Products
1.1 This specification covers high-strength low-alloy struc-
A 673/A 673M Specification for Sampling Procedure for
tural steel plate intended for use in welded construction of
Impact Testing of Structural Steel
naval ships where a savings in weight is important. Steels that
A 700 Practices for Packaging, Marking, and Loading
conform to this specification offer improved weldability, form-
Methods for Steel Products for Domestic Shipment
ability, and toughness resulting from the specified alloying
E 208 Test Method for Conducting Drop-Weight Test to
elements with limitations on carbon, sulfur, and residual
Determine Nil-Ductility Transition Temperature of Ferritic
element contents. Two grades, 50 and 65, may be provided
Steels
as-rolled, control-rolled, thermo-mechanical control processed
(including accelerated cooling), normalized, or quenched and
3. General Requirements for Delivery
tempered as required to meet the specified mechanical require-
3.1 Material furnished under this specification shall con-
ments.
form to the applicable requirements of the current edition of
1.2 Themaximumthicknessorweight[mass]ofplatesshall
Specification A 6/A 6M.
be as follows:
3.2 When specified by the purchaser, materials ordered
Grade Plate thickness, Plate weight [mass],
2 2
under this specification shall be prepared for shipment in
max, in. [mm] max, lb/ft [kg/m ]
50 2 [50] 81.7 [393]
accordance with the requirements of the current edition of
65 1 ⁄4 [32] 51.0 [251]
Specification A 700.
1.3 When the steel is to be welded, it is presupposed that a
4. Materials and Manufacture
welding procedure suitable for the grade of steel and intended
4.1 The steel shall be made to fine grain practice.
use or service will be utilized.
1.4 The values stated in either inch-pound units or SI units 4.2 The plates after finish-rolling shall be in one of the
following conditions: as-rolled, control-rolled, or thermo-
are to be regarded as standard. Within the text the SI units are
shown in brackets. The values stated in each system are not mechanical control processed (including accelerated cooling).
exact equivalents, therefore, each system shall be used inde-
5. Heat Treatment
pendentlyoftheother.Combiningvaluesfromthetwosystems
5.1 Grade 50 plates and Grade 65 plates are normally
may result in nonconformance with this specification.
furnished without heat treatment. The manufacturer has the
2. Referenced Documents
option to normalize or quench and temper this material to meet
the mechanical requirements of Section 7 provided the heat
2.1 ASTM Standards:
A 6/A6M Specification for General Requirements for treatment is reported on the test report.
Rolled Structural Steel Bars, Plates, Shapes, and Sheet
2 6. Chemical Composition
Piling
6.1 The heat analysis shall conform to the chemical com-
position requirements listed in Table 1.
This specification is under the jurisdiction ofASTM CommitteeA01 on Steel,
Stainless Steel, and Related Alloys and is under the direct responsibility of
SubcommitteeA01.02onStructuralSteelforBridges,Buildings,RollingStock,and
Ships.
Current edition approved Sept. 10, 2000. Published October 2000. Originally Annual Book of ASTM Standards, Vol 01.03.
published as A 945/A 945M – 95. Last previous edition A 945/A 945M – 95. Annual Book of ASTM Standards, Vol 01.05.
2 5
Annual Book of ASTM Standards, Vol 01.04. Annual Book of ASTM Standards, Vol 03.01.
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A 945/A 945M – 00
TABLE 1 Chemical Requirements
7.1.3 When measured on a 1 ⁄2 in. [40-mm] wide specimen
(see Fig. 3 of Test Methods and Definitions A 370), the
Element Composition, %
elongation may be determined in a 2 in. [50-mm] gage length
Carbon 0.10 max
which includes the fracture and shows the greatest elongation.
Manganese 1.10–1.65
7.2 Charpy V-Notch Impact Properties:
Phosphorus 0.025 max
Sulfur 0.010 max
7.2.1 The Charpy V-Notch impact tests shall be conducted
Silicon 0.10–0.50
in accordance with Specification A 673/A 673M. All plates
Nickel 0.40 max
shall be tested in accordance with frequency (P) Piece Testing.
Chromium 0.20 max
Molybdenum 0.08 max
7.2.2 Thematerialasrepresentedbythetestspecimensshall
Copper 0.35 max
conform to the impact properties for the applicable grade as
Vanadium 0.10 max
listedinTable3.Thelongitudinalaxisofthespecimensmaybe
Columbium 0.05 max
Aluminum 0.08 max
parallel or transverse to the final direction of rolling of the
material at the option of the steel manufacturer, unless the test
direction is specifie
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