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Enviado por cjvr85 • 21 de Julio de 2011 • Exámen • 3.070 Palabras (13 Páginas) • 2.862 Visitas
11.6.2 Due to the specimen geometry effect encountered
when using full-section test specimens for angles, the elongation
requirements for structural-size angles shall be increased
by six percentage points when full-section test specimens are
11.6.3 Due to the inherently lower elongation that is obtainable
in thicker material, adjustments in elongation requirements
must be provided. For material over 3.5 in. [90 mm] in
thickness, a deduction of 0.5 percentage point from the
specified percentage of elongation in 2 in. [50 mm] shall be
made for each 0.5–in. [12.5–mm] increment of thickness over
3.5 in. [90 mm]. This deduction shall not exceed 3 percentage
points. Accordingly, the following deductions from the base
elongation requirements shall apply:
Nominal Thickness Range,
3.500—3.999 [90.00—102.49] 0.5
4.000—4.499 [102.50—114.99] 1.0
4.500—4.999 [115.00—127.49] 1.5
5.000—5.499 [127.50—139.99] 2.0
5.500—5.999 [140.00—152.49] 2.5
6.000 and thicker [152.50 and thicker] 3.0
11.6.4 When so stated in the material specification, for
plates up to 3⁄4 in. [20 mm], inclusive, in thickness, if the
percentage of elongation of an 8-in. [200-mm] gage length test
specimen falls not more than 3 percentage points below the
amount prescribed, the elongation shall be considered satisfactory,
provided the percentage of elongation in 2 in. [50 mm]
across the break is not less than 25 %.
NOTE 5—A characteristic of certain types of alloy steels is a local
disproportionate increase in the degree of necking down or contraction of
the specimens under tension test, resulting in a decrease in the percentage
of elongation as the gage length is increased. The effect is not so
pronounced in the thicker plates.
11.6.5 The tensile property requirements tables in many of
the material specifications covered by this general specification
specify elongation requirements in both 8-in. [200–mm] and
2-in. [50–mm] gage lengths. Unless otherwise provided in the
individual material specification, both requirements are not
required to be applied simultaneously and elongation need only
be determined in gage length appropriate for the test specimen
used. After selection of the appropriate gage length, the
elongation requirement for the alternative gage length shall be
deemed not applicable.
11.7 Yield Strength Application:
11.7.1 When test specimens do not exhibit a well-defined
disproportionate yield point, yield strength shall be determined
and substituted for yield point.
11.7.2 The manufacturer or processor shall have the option
of substituting yield strength for yield point if the test specimen
exhibits a well-defined disproportionate yield point.
11.7.3 Yield strength shall be determined either by the
0.2 % offset method or by the 0.5 % extension-under-load
11.8 Product Tension Tests—This specification does not
provide requirements for product tension testing subsequent to
shipment (see 15.1). Therefore, the requirements of 11.1 to11.7
inclusive and Section 13 apply only for tests conducted at the
place of manufacture prior to shipment.
NOTE 6—Compliance to Specification A 6/A 6M and the individual
material specifications by a manufacturer does not preclude the possibility
that product tension test results might vary outside specified ranges. The
tensile properties will vary within the same heat or piece, be it as-rolled,
control-rolled, or heat-treated. Tension testing according to the requirements
of Specification A 6/A 6M does not provide assurance that all
products of a heat will be identical in tensile properties with the products
tested. If the purchaser wishes to have more confidence than that provided
by Specification A 6/A 6M testing procedures, additional testing or
requirements, such as Supplementary Requirement S4, should be imposed.
11.8.1 Appendix X2 provides additional information on the
variability of tensile properties in plates and structural shapes
12. Permitted Variations in Dimensions and Weight
12.1 One cubic foot of rolled steel is assumed to weigh 490
lb. One cubic metre of rolled steel is assumed to have a
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