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Enviado por   •  21 de Julio de 2011  •  3.070 Palabras (13 Páginas)  •  2.298 Visitas

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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

used.

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,

in. [mm]

Elongation

Deduction,%

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

method.

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

[Mass]

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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