ASTM A968-96

Standard Specification for Chromium, Chromium-Nickel, and Silicon Alloy Steel Bars and Shapes for Corrosion and Heat-Resisting Service

SCOPE
1.1 This specification covers hot- and cold-finished alloy steel bars, having a chromium content equal to or less than 11.0% including rounds, squares, hexagons, and hot-rolled or extruded shapes for use in corrosion and heat-resisting service.  
1.2 Some steels covered by this specification, especially the high silicon-containing steels, because of their particular alloy content and specialized properties, may require special care in their fabrication and welding. Specific procedures are of fundamental importance, and it is presupposed that all parameters will be in accordance with approved test methods capable of producing the desired properties in the finished fabrication.  
1.3 The values stated in either inch-pound units or SI units are to be regarded separately as standard. 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 this specification.  
1.4 This specification and the applicable material specifications are expressed in both inch-pound and SI units. However, unless the order specifies the applicable "M" specification designation (SI units), the material shall be furnished in inch-pound units.

General Information

• Status: Historical
• Publication Date: 09-Sep-1996
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.17 - Flat-Rolled and Wrought Stainless Steel

Relations

• Replaced By: ASTM A968/A968M-96(2001) - Standard Specification for Chromium, Chromium-Nickel, and Silicon Alloy Steel Bars and Shapes for Corrosion and Heat-Resisting Service
• Effective Date: 10-Sep-1996

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn.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 968 – 96
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Specification for
Chromium, Chromium-Nickel, and Silicon Alloy Steel Bars
1
and Shapes for Corrosion and Heat-Resisting Service
This standard is issued under the fixed designation A 968; 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 SAE J1086 Recommended Practice for Numbering Metals
4
and Alloys
1.1 This specification covers hot- and cold-finished alloy
steel bars, having a chromium content equal to or less than
3. Ordering Information
11.0 % including rounds, squares, hexagons, and hot-rolled or
3.1 It is the responsibility of the purchaser to specify all
extruded shapes for use in corrosion and heat-resisting service.
requirements that are necessary for material ordered under this
1.2 Some steels covered by this specification, especially the
specification. Such requirements may include, but are not
high silicon-containing steels, because of their particular alloy
limited to, the following:
content and specialized properties, may require special care in
3.1.1 Quantity (weight or number of pieces);
their fabrication and welding. Specific procedures are of
3.1.2 Dimensions, including diameter or thickness (and
fundamental importance, and it is presupposed that all param-
width), shape or form, applicable prints or sketches, length, and
eters will be in accordance with approved test methods capable
so forth;
of producing the desired properties in the finished fabrication.
3.1.3 Type or UNS designation, (see Table 1);
1.3 The values stated in either inch-pound units or SI units
3.1.4 ASTM designation and edition year if other than latest
are to be regarded separately as standard. The values stated in
edition;
each system are not exact equivalents; therefore, each system
3.1.5 Heat-treated condition (see Section 4);
must be used independently of the other. Combining values
3.1.6 Finish (see Manufacture section of Specification
from the two systems may result in nonconformance with this
A 484/A 484M);
specification.
3.1.7 Supplementary requirements invoked for special ser-
1.4 This specification and the applicable material specifica-
vices;
tions are expressed in both inch-pound and SI units. However,
3.1.8 Whether bars are to be rolled as bars or cut from strip
unless the order specifies the applicable “M” specification
or plate;
designation (SI units), the material shall be furnished in
3.1.9 Preparation for delivery (see Preparation for Delivery
inch-pound units.
section of Specification A 484/A 484M);
2. Referenced Documents 3.1.10 Marking requirements (see Marking section of
Specification A 484/A 484M);
2.1 ASTM Standards:
3.1.11 Surface preparation of shapes (see Manufacture sec-
A 370 Test Methods and Definitions for Mechanical Testing
2
tion of Specification A 484/A 484M); and
of Steel Products
3.1.12 The intended use of the material, if the purchaser
A 484/A 484M Specification for General Requirements for
2
considers this useful information.
Stainless and Heat-Resisting Bars, Billets, and Forgings
A 751 Test Methods, Practices, and Terminology for
NOTE 1—A typical ordering description is as follows: 5000 lb [2000
2
Chemical Analysis of Steel Products kg]; 1.000-in. [25-mm] round bar by 10 to 12 ft [3 to 4 m]; UNS S70003;
3
to Specification A XXX [A XXX]; annealed; centerless ground; plus any
E 527 Practice for Numbering Metals and Alloys (UNS)
optional supplementary requirements; such as, for example, special
2.2 SAE Standard:
marking instructions.
4. Heat Treatment
4.1 UNS S70003 shall be furnished in the solution annealed
condition with subsequent light drawing and straightening
permitted.
1
This specification is under the jurisdiction of ASTM Committee A-1 on Steel,
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee
A01.17 on Flat-Rolled and Wrought Stainless.
Current edition approved Sept. 10, 1996. Published November 1996.
2 4
Annual Book of ASTM Standards, Vol 01.03. Available from Society of Automotive Engineers, 400 Commonwealth Drive,
3
Annual Book of ASTM Standards, Vol 01.01. Warrendale, PA 15096.
1

---------------------- Page: 1 ----------------------
A 968
A
TABLE 1 Chemical Composition, % TABLE 2 Mechanical Test Requirements
Grade . . . 0.2 % Elonga- B
Hardness, max
Tensile
B
UNS Designation S70003 UNS Yield tion in
Strength,
Grade Desig- Strength, 2 in. or
C 0.02
Brinell Rockwell
min, ksi
A
Mn 2.0 nation min, ksi 50 mm,
B
(MPa)
(MPa) min, %
P 0.025
S 0.010
. . .
...