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ASTM A911/A911M-02

(Specification)

Standard Specification for Uncoated, Stress-Relieved Steel Bars for Prestressed Concrete Ties

Standard Specification for Uncoated, Stress-Relieved Steel Bars for Prestressed Concrete Ties

SCOPE
1.1 This specification covers uncoated stress-relieved steel bars for use in prestressed concrete railroad ties.
1.2 Supplement I describes low-relaxation bars and relaxation testing for that product. Low-relaxation bars shall be furnished when specifically ordered, and may be furnished in place of regular bars if mutually agreed to by the purchaser and manufacturer.
1.3 This specification is applicable for orders in either inch-pounds units (as Specification A 911) or in SI units (as Specification A 911M).
1.4 The values stated in either inch-pound units or SI units are to be regarded separately as standards. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.

General Information

Status
Historical
Publication Date
09-Sep-2002
ICS
77.140.15 - Steels for reinforcement of concrete
Technical Committee
A01 - Steel, Stainless Steel and Related Alloys
Drafting Committee
A01.05 - Steel Reinforcement
Current Stage
Ref Project

Relations

Replaces
ASTM A911/A911M-99 - Standard Specification for Uncoated, Stress-Relieved Steel Bars for Prestressed Concrete Ties
Effective Date
10-Sep-2002
Replaced By
ASTM A911/A911M-05 - Standard Specification for Uncoated, Stress-Relieved Steel Bars for Prestressed Concrete Ties
Effective Date
01-May-2005

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ASTM A911/A911M-02 - Standard Specification for Uncoated, Stress-Relieved Steel Bars for Prestressed Concrete TiesASTM A911/A911M-02 - Standard Specification for Uncoated, Stress-Relieved Steel Bars for Prestressed Concrete Ties
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ASTM A911/A911M-02 - Standard Specification for Uncoated, Stress-Relieved Steel Bars for Prestressed Concrete Ties
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 911/A 911M – 02
Standard Specification for
Uncoated, Stress-Relieved Steel Bars for Prestressed
1
Concrete Railroad Ties
This standard is issued under the fixed designationA911/A911M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope* 3. Terminology
1.1 This specification covers uncoated stress-relieved steel 3.1 Definitions of Terms Specific to This Standard:
bars for use in prestressed concrete railroad ties. 3.1.1 lot, n—all the coils of bars of the same nominal bar
1.2 Supplement I describes low-relaxation bars and relax- size contained on an individual shipping release or shipping
ation testing for that product. Low-relaxation bars shall be order, from the same cast or heat of steel.
furnished when specifically ordered, and may be furnished in
4. Ordering Information
place of regular bars if mutually agreed to by the purchaser and
manufacturer. 4.1 It shall be the responsibility of the purchaser to specify
all requirements that are necessary for bars ordered to this
1.3 This specification is applicable for orders in either
inch-pounds units (as Specification A 911) or in SI units (as specification. Such requirements shall include, but are not
limited to, the following:
Specification A 911M).
1.4 The values stated in either inch-pound units or SI units 4.1.1 Quantity (weight) [mass],
4.1.2 Name of material (uncoated, stress-relieved bars for
are to be regarded separately as standards. Within the text, the
SI units are shown in brackets. The values stated in each prestressed concrete railroad ties),
4.1.3 Diameter of bar (inches) [millimetres],
system are not exact equivalents; therefore, each system must
be used independently of the other. Combining values from the 4.1.4 Packaging,
4.1.5 ASTM designation and year of issue, and
two systems may result in nonconformance with the specifi-
cation. 4.1.6 Special requirements, if any.
NOTE 1—A typical ordering description is as follows: 100 tons [90 t]
2. Referenced Documents
uncoated, stress-relieved steel bars for prestressed concrete railroad ties,
2.1 ASTM Standards:
0.394-in. [10-mm] diameter bars in 6.5-ft [2.0-m] diameter coils toASTM
A 370 Test Methods and Definitions for MechanicalTesting
A XXX – [A XXXM – ].
2
of Steel Products
5. Manufacture
E 328 Methods for Stress-Relaxation Tests for Materials
3
5.1 The bars shall be made from properly identified heats of
and Structures
2.2 Federal Standard: steel made by the electric-furnace, the open-hearth, or the basic
4
oxygen process.
Fed. Std. No. 123 Marking for Shipments (CivilAgencies)
2.3 Military Standards: 5.2 After hot-rolling, the bars shall be cold-drawn and
4
finally stress-relieved by induction heat treatment to produce
MIL-STD-129 Marking for Shipment and Storage
MIL-STD-163 Steel Mill Products Preparation for Ship- the desired mechanical properties and then coiled.
4
ment and Storage
6. Chemical Requirements
6.1 An analysis of each heat of steel shall be made by the
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
manufacturer from test samples taken during the pouring of
Stainless Steel, and RelatedAlloys and is the direct responsibility of Subcommittee
A01.05 on Steel Reinforcement. each heat.
Current edition approved Sept 10, 2002. Published June 2003. Originally
6.2 The analysis of the steel shall conform to the chemical
published in 1992. Last previous edition approved in 1999 as A 911/A 911M – 99.
requirements specified in Table 1.
2
Annual Book of ASTM Standards, Vol 01.03.
3
Annual Book of ASTM Standards, Vol 03.01.
4
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
*A Summary 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.
1

---------------------- Page: 1 ----------------------
A 911/A 911M – 02
TABLE 1 Chemical Requirements TABLE 3 Relaxation Requirements
A
Element Composition, % f /f Max Stress Losses after 1000 h, %
pi pu
A
Carbon 0.70–0.90 0.50 1.0
Silicon 0.10–0.35 0.60 1.0
B
Manganese 0.50–0.90 0.70 2.5
Chromium, max 0.15 0.80 5.0
Phosphorus, max 0.030
A
f = initial prestress load, and
pi
Sulphur, max 0.035
f = specified minimum tensile strength.
pu
Copper, max 0.30
A
Carbon in any one lot shall not vary more than 0.13 %.
B
9.1.1 There shall be no welds or joints in the finished bar.
Manganese in any one lot shall not vary more than 0.30 %.
Any welds or joints made during manufacture to promote
continuity of operations shall be
...

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1.1 This specification covers deformed and plain carbon-steel bars in cut lengths and coils for concrete reinforcement. Annex A2 of this specification covers deformed bars for use for other applications. Steel bars containing alloy additions, such as with the Association for Iron and Steel Technology and the Society of Automotive Engineers series of alloy steels, are permitted if the resulting product meets all the other requirements of this specification. The standard sizes and dimensions of deformed bars and their number designations are given in Table 1.    
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Note 3: Welding of the material in this specification should be approached with caution since no specific provisions have been included to enhance its weldability. When this steel is to be welded, a welding procedure suitable for the chemical composition and intended use or service should be used. T...

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ASTM
ASTM A421/A421M-21(Specification)
Standard Specification for Stress-Relieved Steel Wire for Prestressed Concrete

ABSTRACT
This specification covers two types of uncoated stress-relieved round high-carbon steel wire commonly used in prestressed linear concrete construction. These two types are the type BA used for applications in which cold-end deformation is used for anchoring purposes and type WA wire which is used for application in which the ends are anchored by wedges, no cold-end deformation of the wire is involved. Required tensile strength, yield strength, and elongation shall be evaluated using stress-relaxation test. Heat analysis shall be used to determine the percentage of specified elements especially sulfur and phosphorus to meet the required chemical composition.
SCOPE
1.1 This specification covers two types of stress-relieved round high-carbon steel wire used in prestressed concrete construction, as follows:  
1.1.1 Type BA wire is used for applications in which cold-end deformation is used for anchoring purposes (Button Anchorage), and  
1.1.2 Type WA wire is used for application in which the ends are anchored by wedges, and no cold-end deformation of the wire is involved (Wedge Anchorage).  
1.2 A supplementary requirement (S1) is provided for use where low-relaxation wire and relaxation testing for that product is required by the purchaser. The supplementary requirement applies only when specified in the purchase order or contract.  
1.3 This specification is applicable for orders in either inch-pounds units (as Specification A421) or in SI units (as Specification A421M).  
1.4 The values stated in either inch-pound 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 may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the specification.  
1.5 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables) shall not be considered as requirements of the specification.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Technical specification
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  • Technical specification
    4 pages
    English language
    sale 15% off