ASTM A945/A945M-06(2011)

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.

General Information

• Status: Historical
• Publication Date: 31-Mar-2011
• 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

• Replaces: ASTM A945/A945M-06e1 - 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-Apr-2011
• 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: 01-Apr-2011

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:A945/A945M −06(Reapproved 2011)
Standard Specification for
High-Strength Low-Alloy Structural Steel Plate with Low
Carbon and Restricted Sulfur for Improved Weldability,
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.
1. Scope A6/A6MSpecification for General Requirements for Rolled
Structural Steel Bars, Plates, Shapes, and Sheet Piling
1.1 This specification covers high-strength low-alloy struc-
A370Test Methods and Definitions for Mechanical Testing
tural steel plate intended for use in welded construction of
of Steel Products
naval ships where a savings in weight [mass] is important.
A673/A673MSpecification for Sampling Procedure for Im-
Plates that conform to this specification offer improved
pact Testing of Structural Steel
weldability, formability, and toughness resulting from the
A700Practices for Packaging, Marking, and Loading Meth-
specified alloying elements with limitations on carbon, sulfur,
ods for Steel Products for Shipment
and residual element contents. Grades 50 and 65 may be
E208Test Method for Conducting Drop-Weight Test to
provided as-rolled, control-rolled, thermo-mechanical control
Determine Nil-Ductility Transition Temperature of Fer-
processed (including accelerated cooling), normalized, or
ritic Steels
quenched and tempered as required to meet the specified
mechanical requirements.
3. General Requirements for Delivery
1.2 Themaximumthicknessorweight[mass]ofplatesshall
3.1 Plates furnished under this specification shall conform
be as follows:
to the applicable requirements of the current edition of Speci-
Grade Plate thickness, Plate weight [mass],
2 2 fication A6/A6M.
max, in. [mm] max, lb/ft [kg/m ]
50 2 [50] 81.7 [393]
3.2 If specified in the purchase order, plates ordered under
65 2 ⁄2 [65] 102 [502]
this specification shall be prepared for shipment in accordance
1.3 If the steel is to be welded, it is presupposed that a
with the requirements of the current edition of Specification
welding procedure suitable for the grade of steel and intended
A700.
use or service will be utilized.
1.4 The values stated in either inch-pound units or SI units
4. Materials and Manufacture
aretoberegardedseparatelyasstandard.WithinthetexttheSI
4.1 The steel shall be made to fine grain practice.
units are shown in brackets. The values stated in each system
4.2 Grade65 plates less than 1in. [25mm] in thickness
are not exact equivalents, therefore, each system is to be used
shall be provided from continuously cast product.
independently of the other without combining values in any
way.
4.3 Except as specified in 5.1 and 5.2, the plates after
finish-rolling shall be in one of the following conditions:
2. Referenced Documents
as-rolled, control-rolled, or thermo-mechanical control pro-
cessed (including accelerated cooling).
2.1 ASTM Standards:
5. Heat Treatment
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
5.1 Grade50 plates and Grade65 plates are normally fur-
Stainless Steel and Related Alloys and is under the direct responsibility of
nishedwithoutheattreatment.Themanufacturerhastheoption
Subcommittee A01.02 on Structural Steel for Bridges, Buildings, Rolling Stock and
Ships.
to normalize or quench and temper such plates to meet the
Current edition approved April 1, 2011. Published May 2011. Originally
mechanical requirements of Section 7 provided that the heat
ε1
approved in 1995. Last previous edition approved in 2006 as A945/A945M–06 .
treatment is reported on the test report.
DOI: 10.1520/A0945_A0945M-06R11.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.2 Grade65 plates greater than 1 ⁄4 in. [32 mm] in thick-
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
ness shall be furnished in the quenched and tempered heat
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. treatment.
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A945/A945M−06 (2011)
TABLE 1 Chemical Requirements
6.2 If a product analysis is made, it shall conform to the
requirements given in Table 1, subject to the product analysis
NOTE 1—Where “.” appears in this table, there is no requirement.
tolerances in Specification A6/A6M.
Composition, %
Element Thickness Grade 50 Grade 65
7. Mechanical Properties
†
Carbon (max) All 0.10 0.10
7.1 Tensile Properties:
Manganese All 1.10–1.65 1.10–1.65
Phosphorus All 0.025 0.025
7.1.1 The plates as represented by the test specimens shall
†
(max)
conform to the tensile properties given in Table 2 for the
†
Sulfur (max) All 0.010 0.010
Silicon All 0.10–0.40 0.10–0.40 applicable grade.
††
Nickel 1 ⁄4 in. [32 mm] max. 0.40 max 0.40 max
7.1.2 For quenched and tempered plates, one tension test
Over 1 ⁄4 in. [32 mm] 0.40 max 0.50–1.00
shall be taken from a corner of each plate as heat treated.
Chromium (max) All 0.20 0.20
Molybdenum All 0.08 0.08 7.1.3 If measured on a 1 ⁄2-in. [40-mm] wide specimen (see
(max)
Fig.3 of Test Methods and Definitions A370), the elongation
Copper (max) All 0.35 0.35
may be determined in a 2-in. [50-mm] gage length that
Vanadium (max) All 0.10 0.10
Columbi
...