ASTM A920/A920M-14
(Specification)Standard Specification for Steel Bars, Microalloy, Hot-Wrought, Special Quality, Mechanical Properties
Standard Specification for Steel Bars, Microalloy, Hot-Wrought, Special Quality, Mechanical Properties
ABSTRACT
This specification covers standards for hot-wrought, special quality microalloyed carbon steel bars intended for use in applications where as-rolled mechanical properties are desired. A typical end use includes hydraulic cylinder shafts. The typical chemical composition of microalloyed carbon steel shall contain carbon, manganese, phosphorus, sulfur, and vanadium. Heat and product analyses shall be conducted wherein the material shall conform to the required chemical composition for vanadium, columbium (niobium), and molybdenum. The elements and specified chemical ranges shall not exceed the required limits. The steel bars shall undergo tension test and conform to the mechanical property requirements such as yield strength, tensile strength, and elongation.
SCOPE
1.1 This specification covers hot-wrought, special quality microalloyed carbon steel bars intended for use in applications where as-rolled mechanical properties are desired. A typical end use is hydraulic cylinder shafts.
1.2 The bars shall be furnished to chemical composition and mechanical properties as provided herein. Chemical composition is based on standard carbon steel grades modified to include microalloying elements such as columbium (niobium), vanadium, or molybdenum. Three strength classes are available, designated 75 [520], 80 [550], and 100 [690], corresponding to the minimum yield strength in ksi.
1.3 Sections and sizes of bar steels available are covered in Specification A29/A29M.
1.4 Supplementary Requirements S1 to S5 are provided for use when additional controls or requirements are desired. These shall apply only when specified on the purchase order.
1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text and tables, 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 standard.
1.6 Unless the order specifies the applicable “M” specification designation, the material shall be furnished to the inch-pound units.
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Designation:A920/A920M −14
Standard Specification for
Steel Bars, Microalloy, Hot-Wrought, Special Quality,
1
Mechanical Properties
This standard is issued under the fixed designationA920/A920M; 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 Bars, Carbon and Alloy, Hot-Wrought
A370 Test Methods and Definitions for Mechanical Testing
1.1 This specification covers hot-wrought, special quality
of Steel Products
microalloyed carbon steel bars intended for use in applications
A576 Specification for Steel Bars, Carbon, Hot-Wrought,
where as-rolled mechanical properties are desired. A typical
Special Quality
end use is hydraulic cylinder shafts.
E45 Test Methods for Determining the Inclusion Content of
1.2 Thebarsshallbefurnishedtochemicalcompositionand
Steel
mechanical properties as provided herein. Chemical composi-
tion is based on standard carbon steel grades modified to
3. Terminology
include microalloying elements such as columbium (niobium),
3.1 Definitions of Terms Specific to This Standard:
vanadium, or molybdenum. Three strength classes are
3.1.1 microalloyed steels, n—carbon steels to which small
available, designated 75 [520], 80 [550], and 100 [690],
quantities of certain elements are added in order to enhance
corresponding to the minimum yield strength in ksi.
mechanical properties.
1.3 Sections and sizes of bar steels available are covered in
3.1.1.1 Discussion—This enhancement of mechanical prop-
Specification A29/A29M.
erties results from control of the temperature and cooling rate
1.4 Supplementary Requirements S1 to S5 are provided for during the hot-rolling process.
use when additional controls or requirements are desired.
These shall apply only when specified on the purchase order.
4. Ordering Information
1.5 The values stated in either SI units or inch-pound units
4.1 Orders for material supplied to this specification should
are to be regarded separately as standard. Within the text and
include the following, as required, to describe adequately the
tables,SIunitsareshowninbrackets.Thevaluesstatedineach
desired material:
system may not be exact equivalents; therefore, each system
4.1.1 Quantity (weight or number of bars),
shall be used independently of the other. Combining values
4.1.2 Name of material (hot-rolled microalloyed steel bars),
from the two systems may result in non-conformance with the
4.1.3 Dimensions,
standard.
4.1.4 ASTM specification number and date of issue,
4.1.5 Gradedesignationorchemicalcompositionlimits(see
1.6 Unless the order specifies the applicable “M” specifica-
Section 7),
tion designation, the material shall be furnished to the inch-
4.1.6 Class,
pound units.
4.1.7 Additions to the specification and Supplementary
2. Referenced Documents
Requirements, if required, and,
2
4.1.8 End use.
2.1 ASTM Standards:
A29/A29M SpecificationforGeneralRequirementsforSteel
5. General Requirements
5.1 Material furnished under this specification shall con-
1
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
form to the applicable requirements of the current edition of
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.15 on Bars.
Specification A29/A29M, unless otherwise provided herein.
Current edition approved Oct. 1, 2014. Published October 2014. Originally
approved in 1993. Last previous edition approved in 2007 as A920/A920M – 07.
6. Materials and Manufacture
DOI: 10.1520/A0920_A0920M-14.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.1 Melting Practice—The steel shall be produced in accor-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
dance with the applicable methods for primary and secondary
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. melting outlined in Specification A576.
*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
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A920/A920M−14
TABLE 2 Chemical Requirements—(Microalloy Elements)
6.2 The steel shall be killed. Supplementary Requirements
S1 through S5 may be invoked upon agreement between Element Chemical Ranges and Limits, %
producer and purchaser. Heat Analysis Product Analysis
Vanadium 0.02–0.20 0.01–0.21
6.3 The bars shall be special quality.
Columbium (Niobium) 0.005–0.07 0.004–0.08
Molybdenum 0.01–0.30 0.31 max
6.4 The bars shall be hot-wrought, as wrought, unless
otherwise specified.
7. Chemical Compositi
...
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: A920/A920M − 07 A920/A920M − 14
Standard Specification for
Steel Bars, Microalloy, Hot-Wrought, Special Quality,
1
Mechanical Properties
This standard is issued under the fixed designation A920/A920M; 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*Scope
1.1 This specification covers hot-wrought, special quality microalloyed carbon steel bars intended for use in applications where
as-rolled mechanical properties are desired. A typical end use is hydraulic cylinder shafts.
1.2 The bars shall be furnished to chemical composition and mechanical properties as provided herein. Chemical composition
is based on standard carbon steel grades modified to include microalloying elements such as columbium (niobium), vanadium, or
molybdenum. Three strength classes are available, designated 75 [520], 80 [550], and 100 [690], corresponding to the minimum
yield strength in ksi.
1.3 Sections and sizes of bar steels available are covered in Specification A29/A29M.
1.4 Supplementary Requirements S1 to S5 are provided for use when additional controls or requirements are desired. These
shall apply only when specified on the purchase order.
1.5 The values stated in either inch-poundSI units or SIinch-pound units are to be regarded separately as standard. Within the
text and tables, SI units are shown in brackets. The values stated in each system aremay not be exact equivalents; therefore, each
system mustshall be used independently of the other. Combining values from the two systems may result in nonconformancenon-
conformance with the specification. standard.
1.6 Unless the order specifies the applicable “M” specification designation, the material shall be furnished to the inch-pound
units.
2. Referenced Documents
2
2.1 ASTM Standards:
A29/A29M Specification for General Requirements for Steel Bars, Carbon and Alloy, Hot-Wrought
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A576 Specification for Steel Bars, Carbon, Hot-Wrought, Special Quality
E45 Test Methods for Determining the Inclusion Content of Steel
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 microalloyed steels, n—carbon steels to which small quantities of certain elements are added in order to enhance
mechanical properties.
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 A01.15
on Bars.
Current edition approved Nov. 1, 2007Oct. 1, 2014. Published December 2007October 2014. Originally approved in 1993. Last previous edition approved in 20022007
as A920/A920M – 02a.A920/A920M – 07. DOI: 10.1520/A0920_A0920M-07.10.1520/A0920_A0920M-14.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3.1.1.1 Discussion—
This enhancement of mechanical properties results from control of the temperature and cooling rate during the hot-rolling process.
*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 ----------------------
A920/A920M − 14
4. Ordering Information
4.1 Orders for material supplied to this specification should include the following, as required, to describe adequately the desired
material:
4.1.1 Quantity (weight or number of bars),
4.1.2 Name of material (hot-rolled microalloyed steel bars),
4.1.3 Dimensions,
4.1.4 ASTM specification number and date of issue,
4.1.5 Grade designation or chemical composition limits (see Section 87),
4.1.6 Class,
4.1.7 Type (see 7.1) to designate grain refiner,
4.1.7 Additions to the specification and Supplementary Requirements, if required, and,
4.1.8 End use.
5. General Requirements
5.1 Material furnished under this specification shall conform to the applicable requirements of the current edition of
Specification A29/A29M, unless otherwise provided herein.
6. Materials and Manufacture
6.1 Melting Practice—The steel shall be produced in accordance with the applicable methods for primary and secondary melting
outlined in Specification A5
...
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