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ASTM A921/A921M-93(2005)

(Specification)

Standard Specification for Steel Bars, Microalloy, Hot-Wrought, Special Quality, for Subsequent Hot Forging

Standard Specification for Steel Bars, Microalloy, Hot-Wrought, Special Quality, for Subsequent Hot Forging

ABSTRACT
This specification covers hot-wrought, special quality microalloyed carbon steel bars intended for use as hot forging stock. The bars shall be hot-wrought, as-wrought, unless thermal treatment is necessary to ensure cold shearability. The steel specimens shall be killed and shall conform to the fine grain size requirement. Heat analysis and product analysis shall be performed wherein the specimens shall conform to the required chemical compositions of vanadium, columbium, and molybdenum.
SCOPE
1.1 This specification covers hot-wrought, special quality microalloyed carbon steel bars intended for use as hot forging stock. The bars shall be hot-wrought, as-wrought, unless thermal treatment is necessary to ensure cold shearability.
1.2 The bars shall be furnished to chemical composition only. Chemical composition is based on standard carbon steel grades modified to include microalloying elements such as columbium (niobium), vanadium, or molybdenum. Desired mechanical properties are developed in the subsequent hot forging and controlled cooling operations.
1.3 Sections and sizes of bar steel available are covered in Specification A 29/A 29M.
1.4 Supplementary requirements S1 to S6 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-pound units or SI 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 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.
1.6 Unless the order specifies the applicable "M" specification designation, the material shall be furnished to the inch-pound units.

General Information

Status
Historical
Publication Date
28-Feb-2005
ICS
77.140.20 - Stainless steels
Technical Committee
A01 - Steel, Stainless Steel and Related Alloys
Drafting Committee
A01.15 - Bars
Current Stage
Ref Project

Relations

Replaces
ASTM A921/A921M-93(1999) - Standard Specification for Steel Bars, Microalloy, Hot-Wrought, Special Quality, for Subsequent Hot Forging
Effective Date
01-Mar-2005
Replaced By
ASTM A921/A921M-93(2011) - Standard Specification for Steel Bars, Microalloy, Hot-Wrought, Special Quality, for Subsequent Hot Forging
Effective Date
01-Apr-2011
Referred By
ASTM A909/A909M-06(2021) - Standard Specification for Steel Forgings, Microalloy, for General Industrial Use
Effective Date
01-Mar-2005

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ASTM A921/A921M-93(2005) - Standard Specification for Steel Bars, Microalloy, Hot-Wrought, Special Quality, for Subsequent Hot ForgingASTM A921/A921M-93(2005) - Standard Specification for Steel Bars, Microalloy, Hot-Wrought, Special Quality, for Subsequent Hot Forging
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ASTM A921/A921M-93(2005) - Standard Specification for Steel Bars, Microalloy, Hot-Wrought, Special Quality, for Subsequent Hot Forging
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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: A921/A921M – 93 (Reapproved 2005)
Standard Specification for
Steel Bars, Microalloy, Hot-Wrought, Special Quality, for
Subsequent Hot Forging
This standard is issued under the fixed designationA921/A921M; 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 A788/A788M Specification for Steel Forgings, General Re-
quirements
1.1 This specification covers hot-wrought, special quality
E45 Test Methods for Determining the Inclusion Content of
microalloyed carbon steel bars intended for use as hot forging
Steel
stock. The bars shall be hot-wrought, as-wrought, unless
thermal treatment is necessary to ensure cold shearability.
3. Terminology
1.2 The bars shall be furnished to chemical composition
3.1 Definitions of Terms Specific to This Standard:
only. Chemical composition is based on standard carbon steel
3.1.1 microalloyed steels—microalloyed steels are carbon
grades modified to include microalloying elements such as
steels to which small quantities of certain elements are added
columbium (niobium), vanadium, or molybdenum. Desired
in order to enhance mechanical properties. This enhancement
mechanical properties are developed in the subsequent hot
of mechanical properties results from control of the tempera-
forging and controlled cooling operations.
ture and cooling rate during the final hot-working process.
1.3 Sections and sizes of bar steel available are covered in
Specification A29/A29M.
4. Ordering Information
1.4 Supplementary requirements S1 to S6 are provided for
4.1 Orders for material supplied to this specification should
use when additional controls or requirements are desired.
include the following, as required, to describe adequately the
These shall apply only when specified on the purchase order.
desired material:
1.5 The values stated in either inch-pound units or SI units
4.1.1 Quantity (weight or number of bars),
are to be regarded separately as standard. Within the text and
4.1.2 Name of material (hot-rolled microalloyed steel bars),
tables,SIunitsareshowninbrackets.Thevaluesstatedineach
4.1.3 Dimensions,
system are not exact equivalents; therefore, each system must
4.1.4 ASTM specification number and date of issue,
be used independently of the other. Combining values from the
4.1.5 Gradedesignationorchemicalcompositionlimits(see
two systems may result in nonconformance with the specifi-
8.1-8.5),
cation.
4.1.6 Type (see 7.1) to designate grain refiner,
1.6 Unless the order specifies the applicable “M” specifica-
4.1.7 Additions to the specification and Supplementary
tion designation, the material shall be furnished to the inch-
Requirements, if required, and,
pound units.
4.1.8 End use.
2. Referenced Documents
5. General Requirements
2.1 ASTM Standards:
5.1 Material furnished under this specification shall con-
A29/A29M Specification for Steel Bars, Carbon and Alloy,
form to the applicable requirements of the current edition of
Hot-Wrought, General Requirements for
Specification A29/A29M, unless otherwise provided in this
A576 Specification for Steel Bars, Carbon, Hot-Wrought,
specification.
Special Quality
6. Materials and Manufacture
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
6.1 Melting Practice—The steel shall be produced in accor-
Stainless Steel, and RelatedAlloys and is the direct responsibility of Subcommittee
dance with the applicable methods for primary and secondary
A01.15 on Bars.
melting outlined in Specification A788/A788M.
Current edition approved March 1, 2005. Published March 2005. Originally
6.2 The steel shall be killed. Supplementary Requirements
approved in 1993. Last previous edition approved in 1999 as A921/
A921M - 93(1999). DOI: 10.1520/A0921_A0921M-93R05.
S1 through S6 may be invoked upon agreement between
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
producer and purchaser.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.3 The bars shall be special quality.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Copyright ©ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA19428-2959, United States.
A921/A921M – 93 (2005)
TABLE 1 Typical Chemical Compositions of Microalloyed Carbon Steels
NOTE 1—These compositions are identical to those in Specification A576, with the exception of the addition of vanadium.
Chemical Composition Limits, %
Grade Designation C MN PSV
10V40 0.37–0.44 0.60–0.90 0.040 max 0.050 max 0.02–0.20
10V45 0.43–0.50 0.60–0.90 0.040 max 0.050 max 0.02–0.20
11V37 0.32–0.39 1.35–1.65 0.040 max 0.08–0.13 0.02–0.20
11V41 0.37–0.45 1.35–1.65 0.040 max 0.08–0.13 0.02–0.20
15V24 0.19–0.25 1.35–1.65 0.040 max 0.050 max 0.02–0.20
15V41 0.36–0.44 1.35–1.65 0.040 max 0.050 max 0.02–0.20
TABLE 2 Chemical Requirements—(Microalloy Elements)
6.4 The bars shall be hot-wrought, as wrought.
Chemical Ranges and Limits, %
7. Metallurgical Requirements
Element HeatAnalysis ProductAnalysis
7.1 Grain Size—The steel shall conform to the fine grain
Vanadium 0.02–0.20 0.01–0.21
size requirement of Specification A29/A29M. The grain refin- Columbium (Niobium)
...

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1.4 Sheet and strip in coils of sizes noted in 1.3 are covered by this specification only with the following provisions:  
1.4.1 The material is to be fed directly from coils into a blanking press, drawing or forming operation, tube mill, rolling mill, or sheared or slit into blanks for subsequent drawing or forming.  
1.4.2 The material is not to be converted into steel plates for structural or pressure vessel use unless tested in complete accordance with the appropriate sections of Specifications A6/A6M (plates provided from coils) or A20/A20M (plates produced from coils). Plate converted from coils is no longer governed by this sheet steel specification and since this material is now a plate, the requirements of the appropriate plate specification shall apply, except in cases where there is a conflict between the requirements of the plate specification and this specification. In these cases, the more restrictive limits of either specification shall apply.  
1.4.3 The dimensional tolerances of Specification A635/A635M are applicable to material produced to this specification.  
1.4.4 Not all strength levels are available in all thicknesses. The user should consult the producer for appropriate size limitations.  
1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. 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 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibi...

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ASTM
ASTM A493-23(Specification)
Standard Specification for Stainless Steel Wire and Wire Rods for Cold Heading and Cold Forging

ABSTRACT
This specification covers cold-finished and hot-finished stainless steel wire and wire rods for cold heading or cold forging for applications, such as fasteners, where corrosion resistance is a factor. The steel shall conform to the required chemical composition requirements. The material shall also conform to the requirements as to mechanical properties. All austenitic grades in the annealed condition or annealed and lightly drafted condition shall be capable of passing the criteria set by this specification.
SCOPE
1.1 This specification covers cold-finished and hot-finished stainless steel wire and wire rods for cold heading or cold forging for applications, such as fasteners, where corrosion resistance is a factor.  
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.3 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.

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ASTM
ASTM A314-23(Specification)
Standard Specification for Stainless Steel Billets and Bars for Forging

ABSTRACT
This specification covers stainless steel billets and bars for forging. The steel materials shall be annealed and conditioned by chipping or grinding. The steel specimens shall conform to the required chemical compositions of carbon, manganese, phosphorus, sulfur, silicon, chromium, nickel, molybdenum, nitrogen, and other elements.
SCOPE
1.1 This specification covers stainless steel billets and bars intended only for forging.  
1.2 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.

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ASTM
ASTM A961/A961M-23(Specification)
Standard Specification for Common Requirements for Steel Flanges, Forged Fittings, Valves, and Parts for Piping Applications

ABSTRACT
This specification covers a group of common requirements that shall apply to steel flanges, forged fittings, valves, and parts for piping applications. If the primary melting is required it shall incorporate separate degassing or refining and may be followed by secondary melting, such as electroslag remelting or vacuum remelting. If secondary melting is employed, the heat shall be defined as all of the ingot remelted from a single primary heat. Material requiring heat treatment shall be treated as specified in the individual product specification using the following procedures such as full annealing, solution annealing, isothermal annealing, normalizing, tempering and post-weld heat treatment, stress relieving. Heat analysis shall be used to determine the percentages of carbon, manganese, phosphorus, sulfur, silicon, chromium, nickel, molybdenum, titanium, tantalum, copper, cobalt, nitrogen, aluminum, vanadium, cerium to meet the required chemical composition. The product analysis shall be used to determine if the chemical composition shall conform to the limits of the product specified. Mechanical tests shall be performed to determine the mechanical properties such as hardness, tensile properties, and impact properties.
SCOPE
1.1 This specification covers a group of common requirements that shall apply to steel flanges, forged fittings, valves, and parts for piping applications under any of the following individual product specifications:    
Title of Specification  
ASTM Designation  
Forgings, Carbon Steel, for Piping Components  
A105/A105M  
Forgings, Carbon Steel, for General-Purpose Piping  
A181/A181M  
Forged or Rolled Alloy-Steel Pipe Flanges, Forged  
A182/A182M  
Fittings, and Valves and Parts for High Temperature
Service  
Forgings, Carbon and Low Alloy Steel, Requiring Notch  
A350/A350M  
Toughness Testing for Piping Components  
Forged or Rolled 8 and 9 % Nickel Alloy  
A522/A522M  
Steel Flanges, Fittings, Valves, and Parts  
for Low-Temperature Service  
Forgings, Carbon and Alloy Steel, for Pipe Flanges,  
A694/A694M  
Fittings, Valves, and Parts for High-Pressure
Transmission Service  
Flanges, Forged, Carbon and Alloy Steel for Low  
A707/A707M  
Temperature Service  
Forgings, Carbon Steel, for Piping Components with  
A727/A727M  
Inherent Notch Toughness  
Forgings, Titanium-Stabilized Carbon Steel, for  
A836/A836M  
Glass-Lined Piping and Pressure Vessel Service  
1.2 In case of conflict between a requirement of the individual product specification and a requirement of this general requirement specification, the requirements of the individual product specification shall prevail over those of this specification.  
1.3 By mutual agreement between the purchaser and the supplier, additional requirements may be specified (see Section 4.1.2). The acceptance of any such additional requirements shall be dependent on negotiations with the supplier and must be included in the order as agreed upon between the purchaser and supplier.  
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text and the tables, 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 standard. The inch-pound units shall apply, unless the “M” designation (SI) of the product specification is specified in the order.  
1.5 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.

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