ASTM A945/A945M-06e1
(Specification)Standard Specification for High-Strength Low-Alloy Structural Steel Plate with Low Carbon and Restricted Sulfur for Improved Weldability, Formability, and Toughness
Standard Specification for High-Strength Low-Alloy Structural Steel Plate with Low Carbon and Restricted Sulfur for Improved Weldability, Formability, and Toughness
ABSTRACT
This specification covers high-strength low-alloy structural steel plates intended for use in welded construction of naval ships where a savings in weight (mass) is important. The steel shall be made to fine grain practice. The plates shall optionally undergo heat treatment such as quenching or tempering to meet the requirements on mechanical properties such as yield point, yield strength, elongation, and Charpy V-notch impact, provided that the treatment be reported on the test report. The specimen shall undergo heat and product analyses and conform to the chemical composition values of carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, copper, vanadium, columbium, aluminum, titanium, and nitrogen.
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 [mass] is important. Plates 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. 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 21/2 [65]102 [502]
1.3 If 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 separately 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 is to be used independently of the other without combining values in any way.
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Designation: A945/A945M – 06
Standard Specification for
High-Strength Low-Alloy Structural Steel Plate with Low
Carbon and Restricted Sulfur for Improved Weldability,
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Formability, and Toughness
This standard is issued under the fixed designationA945/A945M; the number immediately following the designation indicates the year
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 (´) indicates an editorial change since the last revision or reapproval.
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´ NOTE—Corrected the thickness value for Nickel editorially in October 2006.
1. Scope* way.
1.1 This specification covers high-strength low-alloy struc-
2. Referenced Documents
tural steel plate intended for use in welded construction of
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2.1 ASTM Standards:
naval ships where a savings in weight [mass] is important.
A6/A6M SpecificationforGeneralRequirementsforRolled
Plates that conform to this specification offer improved weld-
Structural Steel Bars, Plates, Shapes, and Sheet Piling
ability, formability, and toughness resulting from the specified
A370 Test Methods and Definitions for Mechanical Testing
alloying elements with limitations on carbon, sulfur, and
of Steel Products
residual element contents. Grades 50 and 65 may be provided
A673/A673M Specification for Sampling Procedure for
as-rolled, control-rolled, thermo-mechanical control processed
Impact Testing of Structural Steel
(including accelerated cooling), normalized, or quenched and
A700 PracticesforPackaging,Marking,andLoadingMeth-
tempered as required to meet the specified mechanical require-
ods for Steel Products for Shipment
ments.
E208 Test Method for Conducting Drop-Weight Test to
1.2 Themaximumthicknessorweight[mass]ofplatesshall
Determine Nil-DuctilityTransitionTemperature of Ferritic
be as follows:
Steels
Grade Plate thickness, Plate weight [mass],
2 2
max, in. [mm] max, lb/ft [kg/m ]
3. General Requirements for Delivery
50 2 [50] 81.7 [393]
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65 2 ⁄2 [65] 102 [502]
3.1 Plates furnished under this specification shall conform
to the applicable requirements of the current edition of Speci-
1.3 If the steel is to be welded, it is presupposed that a
welding procedure suitable for the grade of steel and intended fication A6/A6M.
3.2 If specified in the purchase order, plates ordered under
use or service will be utilized.
1.4 The values stated in either inch-pound units or SI units this specification shall be prepared for shipment in accordance
with the requirements of the current edition of Specification
aretoberegardedseparatelyasstandard.WithinthetexttheSI
units are shown in brackets. The values stated in each system A700.
are not exact equivalents, therefore, each system is to be used
4. Materials and Manufacture
independently of the other without combining values in any
4.1 The steel shall be made to fine grain practice.
4.2 Grade 65 plates less than 1 in. [25 mm] in thickness
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This specification is under the jurisdiction ofASTM CommitteeA01 on Steel,
shall be provided from continuously cast product.
Stainless Steel and Related Alloys and is under the direct responsibility of
SubcommitteeA01.02 on Structural Steel for Bridges, Buildings, Rolling Stock and
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Ships. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Oct. 12, 2006. Published September 2006. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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approved in 1995. Last previous edition approved in 2005 asA945/A945M–05 . Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/A0945_A0945M-06E01. the ASTM website.
*ASummary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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A945/A945M – 06
TABLE 2 Tensile Requirements
4.3 Except as specified in 5.1 and 5.2, the plates after
finish-rolling shall be in one of the following conditions:
B
Minimum Elongation, %
Yield Point or Yield
as-rolled, control-rolled, or thermo-mechanical control pro-
Tensile Strength
A
Grade Strength
In8in. In2in.
ksi [MPa]
cessed (including accelerated cooling).
min, ksi [MPa]
[200 mm] [50 mm]
50 50 [345] 70 [485]–90 [620] 21 24
5. Heat Treatment
65 65 [450] 78 [540]–100 [690] 18 22
5.1 Grade 50 plates and Grade 65 plates are normally A
Measured at 0.2 % offset or 0.5 % extension under load as described in
furnished without heat treatment. The manufacturer has the Section 13 on yield strength of Test Methods and Definitions A370.
B
For plates wider than 24 in. [600 mm], the elongation requirement is reduced
option to normalize or quench and temper such plates to meet
two percentage points. See elongation requiremen
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