ASTM A911/A911M-21

Standard Specification for Low-Relaxation Steel Bars for Prestressed Concrete Railroad Ties

ABSTRACT
This specification covers uncoated, stress-relieved steel bars for prestressed concrete railroad ties. Analysis of the steel shall conform to the chemical requirements specified by the specification. Mechanical requirements including test method, tensile strength, yield strength, elongation and wrapping test are provided. One test specimen each for the tensile test and the wrapping test shall be taken for every 10 coils or fraction thereof in a lot.
SCOPE
1.1 This specification covers low-relaxation steel bars for use in prestressed concrete railroad ties.  
1.2 This specification is applicable for orders in either inch-pounds units (as Specification A911) or in SI units (as Specification A911M).  
1.3 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 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.  
1.4 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.

General Information

• Status: Published
• Publication Date: 14-Apr-2021
• ICS: 77.140.15 - Steels for reinforcement of concrete
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.05 - Steel Reinforcement

Standards Content (Sample)

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.
Designation:A911/A911M −21
Standard Specification for
Low-Relaxation Steel Bars for Prestressed Concrete
1
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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 3. Terminology
1.1 This specification covers low-relaxation steel bars for 3.1 Definition of Term Specific to This Specification:
use in prestressed concrete railroad ties. 3.1.1 lot, n—all the coils of bars of the same nominal bar
size contained on an individual shipping release or shipping
1.2 This specification is applicable for orders in either
order, from the same heat of steel.
inch-pounds units (as Specification A911) or in SI units (as
Specification A911M).
4. Ordering Information
1.3 The values stated in either inch-pound units or SI units
4.1 Orders for low-relaxation steel bars for prestressed
are to be regarded separately as standard. Within the text, the
concrete railroad ties under this specification shall contain the
SI units are shown in brackets. The values stated in each
following information:
system may not be exact equivalents; therefore, each system
4.1.1 Quantity (weight) [mass],
shall be used independently of the other. Combining values
4.1.2 Nominal diameter of bar (inches) [millimetres],
from the two systems may result in non-conformance with the
4.1.3 Core diameter and length of coils (15.1),
specification.
4.1.4 Packaging,
1.4 This international standard was developed in accor-
4.1.5 Supplementary Requirement S1 (if desired), and
dance with internationally recognized principles on standard-
4.1.6 ASTM designation (A911 [A911M]) and year of
ization established in the Decision on Principles for the
issue.
Development of International Standards, Guides and Recom-
4.2 Thepurchasershallhavetheoptiontospecifyadditional
mendations issued by the World Trade Organization Technical
requirements, including but not limited to, the following:
Barriers to Trade (TBT) Committee.
4.2.1 Prior relaxation tests of similarly-dimensioned bars
2. Referenced Documents
(7.6.3),
2
4.2.2 Inspection and witnessing of testing (Section 12),
2.1 ASTM Standards:
4.2.3 Load-elongation curves for each test (14.2),
A370 Test Methods and Definitions for Mechanical Testing
4.2.4 Special packaging and marking (Section 15), and
of Steel Products
4.2.5 Other special requirements, if any.
E328 Test Methods for Stress Relaxation for Materials and
Structures
3
5. Manufacture
2.2 Federal Standard:
Fed. Std. No. 123 Marking for Shipments (Civil Agencies)
5.1 The bars shall be made from properly identified heats of
3
2.3 Military Standards:
steel made by the electric-furnace, the basic-oxygen, or other
MIL-STD-129 Marking for Shipment and Storage
commercially accepted steelmaking process.
5.2 After hot-rolling, the bars shall be cold-drawn and
1 finally stress-relieved by induction heat treatment to produce
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
the desired mechanical properties and then coiled.
A01.05 on Steel Reinforcement.
Current edition approved April 15, 2021. Published May 2021. Originally
6. Chemical Requirements
published in 1992. Last previous edition approved in 2015 as A911/A911M – 15.
DOI: 10.1520/A0911_A0911M-21.
6.1 An analysis of each heat of steel shall be made by the
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
manufacturer from test samples taken during the pouring of
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on each heat.
the ASTM website.
3
6.2 The analysis of the steel shall conform to the chemical
Available from DLA Document Services, Building 4/D, 700 Robbins Ave.,
Philadelphia, PA 19111-5094, http://quicksearch.dla.mil. requirements specified in Table 1.
*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 ----------------------
A911/A911M−21
TABLE 1 Chemical Requirements
7.6.3 If required in the purchase order, relaxation evidence
Element Composition, % shall be provided from the manufacturer’s records of tests on
A
Carbon 0.70–0.90 similarly dimensioned bars.
Silicon 0.10–0.35
7.6.4 The test spe
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A911/A911M − 15 A911/A911M − 21
Standard Specification for
Low-Relaxation Steel Bars for Prestressed Concrete
1
Railroad Ties
This standard is issued under the fixed designation A911/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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This specification covers low-relaxation steel bars for use in prestressed concrete railroad ties.
1.2 This specification is applicable for orders in either inch-pounds units (as Specification A911) or in SI units (as Specification
A911M).
1.3 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 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.
1.4 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.
2. Referenced Documents
2
2.1 ASTM Standards:
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
E328 Test Methods for Stress Relaxation for Materials and Structures
3
2.2 Federal Standard:
Fed. Std. No. 123 Marking for Shipments (Civil Agencies)
3
2.3 Military Standards:
MIL-STD-129 Marking for Shipment and Storage
3. Terminology
3.1 Definition of Term Specific to This Specification:
3.1.1 lot, n—all the coils of bars of the same nominal bar size contained on an individual shipping release or shipping order, from
the same heat of steel.
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.05
on Steel Reinforcement.
Current edition approved Nov. 1, 2015April 15, 2021. Published January 2016May 2021. Originally published in 1992. Last previous edition approved in 20112015 as
A911/A911M – 11.A911/A911M – 15. DOI: 10.1520/A0911_A0911M-15.10.1520/A0911_A0911M-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, DLA Document Services, Building 4/D, 700 Robbins Ave., Philadelphia, PA
19111-5098, http://dodssp.daps.dla.mil.19111-5094, http://quicksearch.dla.mil.
*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 ----------------------
A911/A911M − 21
4. Ordering Information
4.1 Orders for low-relaxation steel bars for prestressed concrete railroad ties under this specification shall contain the following
information:
4.1.1 Quantity (weight) [mass],
4.1.2 Nominal diameter of bar (inches) [millimetres],
4.1.3 Core diameter and length of coils (15.1),
4.1.4 Packaging,
4.1.5 Supplementary Requirement S1 (if desired), and
4.1.6 ASTM designation (A911 [A911M]) and year of issue.
4.2 The purchaser shall have the option to specify additional requirements, including but not limited to, the following:
4.2.1 Prior relaxation tests of similarly-dimensioned bars (7.6.3),
4.2.2 Inspection and witnessing of testing (Section 12),
4.2.3 Load-elongation curves for each test (14.2),
4.2.4 Special packaging and marking (Section 15), and
4.2.5 Other special requirements, if any.
5. Manufacture
5.1 The bars shall be made from properly identified heats of steel made by the electric-furnace, the basic-oxygen, or other
commercially accepted steelmaking process.
5.2 After hot-rolling, the bars shall be cold-drawn and finally stress-relieved by induction heat treatment to produce the desired
mechanical properties and then coiled.
6. Chemical Requirements
6.1 An analysis of each heat of steel shall be made by the manufacturer from test samples taken during the pouring of each heat.
6.2 The analysis of the steel shall
...