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ASTM A921/A921M-93(1999)

(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

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 A29/A29M.  
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
09-Mar-1999
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

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

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ASTM A921/A921M-93(1999) - Standard Specification for Steel Bars, Microalloy, Hot-Wrought, Special Quality, for Subsequent Hot ForgingASTM A921/A921M-93(1999) - Standard Specification for Steel Bars, Microalloy, Hot-Wrought, Special Quality, for Subsequent Hot Forging
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ASTM A921/A921M-93(1999) - 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: A 921/A 921M – 93 (Reapproved 1999)
Standard Specification for
Steel Bars, Microalloy, Hot-Wrought, Special Quality, for
Subsequent Hot Forging
This standard is issued under the fixed designationA 921/A 921M; 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 A 788 Specification for Steel Forgings, General Require-
ments
1.1 This specification covers hot-wrought, special quality
E 45 Practice 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 A 29/A 29M.
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 Grade designation or chemical composition limits (see
two systems may result in nonconformance with the specifi-
8.1 to 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-
A 29/A 29M SpecificationforSteelBars,CarbonandAlloy,
form to the applicable requirements of the current edition of
Hot-Wrought and Cold-Finished, General Requirements
Specification A 29/A 29M, unless otherwise provided herein.
for
A 576 Specification for Steel Bars, Carbon, Hot-Wrought,
6. Materials and Manufacture
Special Quality
6.1 Melting Practice—The steel shall be produced in accor-
A 751 Test Methods, Practices, and Terminology for
3 dance with the applicable methods for primary and secondary
Chemical Analysis of Steel Products
melting outlined in Specification A 788.
6.2 The steel shall be killed. Supplementary Requirements
S1 through S6 may be invoked upon agreement between
This specification is under the jurisdiction of ASTM Committee A-1 on Steel,
producer and purchaser.
Stainless Steel, and RelatedAlloys and is the direct responsibility of Subcommittee
6.3 The bars shall be special quality.
A01.15 on Bars.
Current edition approved Dec. 15, 1993. Published February 1994.
Annual Book of ASTM Standards, Vol 01.05.
3 4
Annual Book of ASTM Standards, Vol 01.03. Annual Book of ASTM Standards, Vol 03.01.
Copyright ©ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA19428-2959, United States.
A 921/A 921M – 93 (1999)
6.4 The bars shall be hot-wrought, as wrought. shall be as agreed upon between producer and purchaser. The
titanium analysis shall be reported.
7. Metallurgical Requirements
8.5 Nitrogenmaybespecifiedasasupplementtovanadium,
7.1 Grain Size—The steel shall conform to the fine grain
columbium, or titanium. When nitrogen is specified to supple-
size requirement of Specification A 29/A 29M. The grain
ment vanadium, the minimum ratio of vanadium to nitrogen
refining element may be specified according to one of the
shall be 4 to 1. The nitrogen content shall not exceed 0.03 %
following types:
and shall be reported.
7.1.1 Type A—Aluminum—The total aluminum analysis
8.6 Sampling for heat and product analysis shall be in
shall be 0.020 % or greater, and shall be reported.
accordance with the requirements of Specification A 29/
7.1.2 Type B—The grain refining element shall be specified
A 29M.
in accordance with 5.1.2.3 of Specification A 29/A 29M.
8. Chemical Composition
9. Workmanship and Appearance
8.1 Typical examples of ch
...

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Size Limits, Coils Only  
Width, in. [mm]  
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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.  
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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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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.
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Title of Specification  
ASTM
DesignationA  
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A209/A209M  
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and Condenser Tubes  
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Superheater Tubes  
A250/A250M  
Seamless and Welded Ferritic and Martensitic Stainless Steel
Tubing for General Service  
A268/A268M  
Seamless and Welded Austenitic Stainless Steel Tubing for
General Service  
A269/A269M  
Seamless and Welded Austenitic and Ferritic/Austenitic
Stainless Steel Sanitary Tubing  
A270/A270M  
Seamless and Welded Carbon and Alloy-Steel Tubes for
Low-Temperature Service  
A334/A334M  
Welded Austenitic Stainless Steel Feedwater Heater Tubes  
A688/A688M  
Austenitic Stainless Steel Tubing for Breeder Reactor Core
Components  
A771/A771M  
Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing
for General Service  
A789/A789M  
Seamless and Welded Ferritic Stainless Steel Feedwater Heater
Tubes  
A803/A803M  
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A826/A826M  
High-Frequency Induction Welded, Unannealed, Austenitic
Steel Condenser Tubes  
A851  
Welded Austenitic Alloy Steel Boiler, Superheater, Condenser,
and Heat Exchanger Tubes with Textured Surface(s)  
A1098/A1098M  
1.2 In the case of conflict between a requirement of a product specification and a requirement of this general requirements specification, the product specification shall prevail. In the case of conflict between a requirement of the product specification or a requirement of this general requirements specification and a more stringent requirement of the purchase order, the purchase order shall prevail.  
1.3 The values stated in either SI units or inch-pound 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 standard. The inch-pound units shall apply unless the “M” designation (SI) of the product specification is specified in the order.  
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.

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  • Technical specification
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ASTM
ASTM A1011/A1011M-23(Specification)
Standard Specification for Steel, Sheet and Strip, Hot-Rolled, Carbon, Structural, High-Strength Low-Alloy, High-Strength Low-Alloy with Improved Formability, and Ultra-High Strength

ABSTRACT
This specification covers hot-rolled, carbon, structural, high-strength low-alloy, high-strength low-alloy with improved formability, and ultra-high strength steel sheet and strip, in coils and cut lengths. The steels covered here are: Commercial Steels of types A, B, C, and D; Drawing Steels of types A and B; Structural Steels of grades 30 [205], 33 [230], 36 [250] (with Types 1 and 2), 40 [275], 45 [310], 50 [340], 55 [380], 60 [410], 70 [480], and 80 [550]; High-strength Low-alloy Steel of classes 1 and 2 in grades 45 [310], 50 [340], 55 [380], 60 [410], 65 [450], and 70 [480]; High-strength Low-alloy steels with improved formability in grades 50 [340], 60 [410], 70 [480], and 80 [550]; and Ultra-high Strength Steels of types 1 and 2 in grades 90 [620] and 100 [690]. Heat and product analyses shall be performed wherein specimens shall conform to required chemical composition of carbon, manganese, phosphorus, sulfur, aluminum, silicon, copper, nickel, chromium, molybdenum, vanadium, niobium, titanium, nitrogen, and boron. Except for Commercial and Drawing steels, all other steels shall undergo two tension tests, and shall conform to the following mechanical requirements: yield strength, tensile strength, and elongation. All steels shall undergo bending tests.
SCOPE
1.1 This specification covers hot-rolled, carbon, structural, high-strength low-alloy, high-strength low-alloy with improved formability, and ultra-high strength steel sheet and strip, in coils and cut lengths.  
1.2 Hot rolled steel sheet and strip is available in the designations as listed in 4.1.  
1.3 This specification is not applicable to the steel covered by Specification A635/A635M.  
1.4 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.  
1.5 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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  • Technical specification
    8 pages
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