ASTM A769/A769M-05(2010)
(Specification)Standard Specification for Carbon and High-Strength Electric Resistance Forge-Welded Steel Structural Shapes
Standard Specification for Carbon and High-Strength Electric Resistance Forge-Welded Steel Structural Shapes
ABSTRACT
This specification covers carbon and high-strength steel shapes of structural quality manufactured by the electric resistance forge-welding process from coils. The specimens shall be established by the steel supplier, shape manufacturer, and shape purchaser of the materials. Specimens shall conform to the required chemical compositions of carbon, manganese, phosphorus, sulfur and silicon. Specimens shall undergo tension tests, peel tests and tee tension tests and shall conform to the required values of tensile strength, yield point, and elongation.
SCOPE
1.1 This specification covers carbon and high-strength steel shapes of structural quality manufactured by the electric-resistance forge-welding process from coils.
1.2 The size range covered is described in nominal dimensions for columns, beams, and tees.
General Information
Relations
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:A769/A769M −05 (Reapproved 2010)
Standard Specification for
Carbon and High-Strength Electric Resistance Forge-
Welded Steel Structural Shapes
This standard is issued under the fixed designationA769/A769M; 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 1.6 The following safety hazards caveat pertains only to the
test methods portion, Section 10, of this specification:This
1.1 This specification covers carbon and high-strength steel
standarddoesnotpurporttoaddressallofthesafetyconcerns,
shapes of structural quality manufactured by the electric-
ifany,associatedwithitsuse.Itistheresponsibilityoftheuser
resistance forge-welding process from coils.
of this standard to establish appropriate safety and health
1.2 The size range covered is described in nominal dimen-
practices and determine the applicability of regulatory limita-
sions for columns, beams, and tees.
tions prior to use.
Size Range, in. (mm)
Web thickness 0.060 to 0.375 [1.5 to 10]
2. Referenced Documents
Flange thickness 0.060 to 0.500 [1.5 to 12.7]
Overall depth 2.00 to 24.00 [50 to 600] 2.1 ASTM Standards:
Flange width 0.50 to 12.00 [12.7 to 300]
A6/A6M Specification for General Requirements for Rolled
1.3 These shapes are intended for two classes of applica- Structural Steel Bars, Plates, Shapes, and Sheet Piling
tion: A370 Test Methods and Definitions for Mechanical Testing
of Steel Products
1.3.1 Class 1—General structural use where static loading
predominates. A568/A568M Specification for Steel, Sheet, Carbon,
Structural,andHigh-Strength,Low-Alloy,Hot-Rolledand
1.3.2 Class 2—Structural use where fatigue loading occurs
Cold-Rolled, General Requirements for
and is a principal design consideration.
A700 Practices for Packaging, Marking, and Loading Meth-
ods for Steel Products for Shipment (Withdrawn 2014)
NOTE 1—Caution—Because of the absence of smooth, integral, large
2.2 American Welding Society Standard:
radius fillets at the junctions of the webs and the flanges (see Fig. 1),
AWS Specification D 1.1 Structural Welding Code
fatigue limits of resistance forge-welded shapes in torsion, lateral loading,
and flexure are usually lower than those for hot-rolled shapes of similar
size and material. Users should consult shape manufacturers for recom-
3. Ordering Information
mended values of fatigue limits for each specific use, material, and size in
3.1 Orders for material under this specification should
cases where dynamic loading is a principal design consideration.
include the following, as required, to describe the desired
1.4 When the steel is to be welded, it is presupposed that a
material adequately:
welding procedure suitable for the grade of steel and intended
3.1.1 Quantity (total number of feet (metres) or lengths),
use or service will be utilized. See Appendix X3 of Specifica-
3.2 ASTM designation and year of issue, grade, and class,
tion A6/A6M for information on weldability.
3.3 Shape and size,
1.5 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. The values stated in
3.4 Length of each piece,
each system may not be exact equivalents; therefore, each
3.5 Information on intended application,
system shall be used independently of the other. Combining
3.6 Other special requirements, and
values from the two systems may result in non-conformance
with the standard.
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
This specification is under the jurisdiction ofASTM Committee A01 on Steel, Standards volume information, refer to the standard’s Document Summary page on
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee the ASTM website.
A01.02 on Structural Steel for Bridges, Buildings, Rolling Stock and Ships. The last approved version of this historical standard is referenced on
Current edition approved April 1, 2010. Published July 2010. Originally www.astm.org.
approved in 1979. Last previous edition approved in 2005 as A769/A769M – 05. Available from American Welding Society (AWS), 550 NW LeJeune Rd.,
DOI: 10.1520/A0769_A0769M-05R10. Miami, FL 33126, http://www.aws.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A769/A769M−05 (2010)
FIG. 1 Appearance of Peel Test Criteria
A
TABLE 1 Chemical Requirements
3.7 Required certification and test reports.
General Limitations, %
Carbon 0.26 max
Manganese 0.30 min to 1.65 max
4. Materials and Manufacture
Phosphorus 0.04 max
4.1 The shapes shall be manufactured from coils by the Sulfur 0.05 max
Silicon 0.60 max
electric-resistance forge-welding process. All components of a
A
The choice and use of alloying elements (combined with carbon, manganese,
shape shall be furnished to the same grade unless otherwise
phosphorus, and sulfur within the limits prescribed) to provide the specified
specified.
mechanical properties, or to enhance the atmospheric corrosion resistance, or
both, may vary with manufacturer and thickness of material. Elements commonly
4.2 For Class 1 shapes the average width of weld at the joint
added include: boron, chromium, copper, molybdenum, nickel, silicon, vanadium,
to the flange shall be more than 110 % of the nominal web
titanium, zirconium, and columbium. The heat analysis, including the alloying
elements intentionally added, shall be reported to the purchaser. Permitted
thickness (see Fig. 1(b)). The acceptability of coil-splice welds
variations in product analysis shall be within the limits established in Table B of
in webs and flanges shall be subject to negotiation between the
Specification A6/A6M.
purchaser and the manufacturer.
4.3 For Class 2 shapes the average width of weld at the joint
to the flange shall be more than 130 % of the nominal web
the shape manufacturer with material that is weldable by the
thickness (see Fig. 1(b)). Coil-splice welds shall not be
electric-resistance welding process.
permitted.
6. Tension Test
4.4 Flash caused by welding will not be removed unless
indicated on the purchase order. 6.1 The material as represented by the test specimen shall
conform to the requirements of tensile properties prescribed in
5. Chemical Composition
Table 2.
5.1 An analysis of each heat of steel shall be made by the
6.2 The shape manufacturer shall furnish, upon request, test
steel manufacturer. The chemical composition thus determined
reports of tensile properties determined in accordance with
shall conform to the requirements of Table 1, subject to the
Sections 8, 9, and 10.
product analysis tolerances in Specification A6/A6M for plate
steels or Specification A568/A568M for sheet steels. Heat 7. Permissible Variations in Dimensions
analysis reports shall be furnished by the shape manufacturer
7.1 Unless otherwise agreed upon by the shape manufac-
upon request.
turer and the purchaser, dimensional variations shall conform
5.2 The steel supplier, shape manufacturer, and the shape to Specification A6/A6M (13.3 and Tables 16 to Tables 24
purchaser shall establish a chemical composition, which will inclusive) for shapes of similar dimensions. Thicknesses of the
assure the purchaser of the desired properties while providing shape components shall be based on nominal thicknesses
A769/A769M−05 (2010)
TABLE 2 Mechanical Properties
A A
Grade 36 45 45W 50 50W 60 80
Tensile strength, min, psi [MPa] 53 000 60 000 65 000 65 000 70 000 75 000 90 000
[365] [415] [450] [450] [485] [520] [620]
Yield point, min, psi [MPa] 36 000 45 000 45 000 50 000 50 000 60 000 80 000
[250] [310] [310] [345] [345] [415] [550]
Elongation, min, %
in 2 in. [50 mm] 22 19 19 17 17 17 17
B
in 8 in. [200 mm] 15 14 14 12 12 12 12
A
The suffix “W’’ indicates steel grades having atmospheric corrosion resistance approximately two times that of carbon structural steel with copper.
B
SeeelongationrequirementadjustmentsundertheTensionTestssectionofSpecificationA6/A6M.SeespecimenorientationintheTensionTestssectionofSpecification
A6/A6M.
TABLE 3 Common Sizes of Electric Resistance Forge-Welded Sections
Designation Area Weight Depth Web Thickness Flange Width Flange Thickness
Depth × lb/ft in2 [mm2] lb/ft [kg/m] in. [mm] in. [mm] in. [mm] in. [mm]
3.50 × 3.23 0.932 [601] 3.23 [4.81] 3.5 [89] 0.095 [2.4] 3.25 [83] 0.095 [2.4]
3.63 × 3.61 1.041 [672] 3.61 [5.37] 3.625 [92] 0.105 [2.7] 3.25 [83] 0.105 [2.7]
4.00 × 3.75 1.080 [697] 3.75 [5.58] 4.00 [102] 0.105 [2.7] 3.25 [83] 0.105 [2.7]
5.50 × 3.88 1.122 [724] 3.88 [5.77] 5.50 [140] 0.095 [2.4] 3.25 [83] 0.095 [2.4]
6.00 × 4.46 1.290 [832] 4.46 [6.64] 6.00 [152] 0.105 [2.7] 3.25 [83] 0.105 [2.7]
6.50 × 4.02 1.181 [762] 4.02 [5.98] 6.50 [165] 0.090 [2.3] 2.50 [64] 0.120 [3.1]
8.00 × 6.38 1.853 [1196] 6.39 [9.51] 8.00 [203] 0.120 [3.1] 3.00 [76] 0.155 [3.9]
8.25 × 5.65 1.662 [1073] 5.65 [8.41] 8.25 [210] 0.090 [2.3] 3.00 [76] 0.095 [2.4]
10.00 × 7.59 2.208 [1425] 7.59 [11.30] 10.00 [254] 0.120 [3.1] 3.00 [76] 0.175 [4.5]
10.25 × 7.60 2.235 [1442] 7.60 [11.31] 10.25 [260] 0.100 [2.5] 3.50 [89] 0.175 [4.5]
10.25 × 8.28 2.437 [1572] 8.28 [12.33] 10.25 [260] 0.120 [3.1] 3.50 [89] 0.175 [4.5]
12.00 × 10.61 3.120 [2013] 10.61 [15.79] 12.00 [305] 0.120 [3.1] 3.50 [89] 0.245 [6.2]
12.25 × 9.90 2.911 [1878] 9.90 [14.73] 12.25 [311] 0.100 [2.5] 3.50 [89] 0.245 [6.2]
12.25 × 10.71 3.150 [2032] 10.71 [15.94] 12.25 [311] 0.120 [3.1] 3.50 [89] 0.245 [6.2]
14.00 × 11.43 3.336 [2152] 11.43 [17.01] 14.00 [356] 0.120 [3.1] 3.50 [89] 0.245 [6.2]
16.00 × 14.11 4.150 [2677] 14.11 [21.00] 16.00 [406] 0.155 [3.9] 3.50 [89] 0.245 [6.2]
conforming to Specification A6/A6M (Table 1, plate) or nominal thickness which differs by more than 0.050 in. [1.2
Specification A568/A568M (Tables 4 and Tables 5, sheet). mm] from the thickness already tested for that heat.
Nominal thickness shall be defined as the minimum thickness 8.1.3 For all steel not made to minimum mechanical
specified plus one half the allowable thickness tolerance as properties, regardless of thickness, the shape manufacturer
shown in the tables. The nominal weight per foot of the shape shall make the tests as in 8.1.2 for each coil. Specimens taken
shall
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