ASTM A770/A770M-86(2001)
(Specification)Standard Specification for Through-Thickness Tension Testing of Steel Plates for Special Applications
Standard Specification for Through-Thickness Tension Testing of Steel Plates for Special Applications
SCOPE
1.1 This specification covers the procedures and acceptance standards for the determination of reduction of area using a tension test specimen whose axis is perpendicular to the rolled surfaces of steel plates 1 in. [25 mm] and greater in thickness. The principal purpose of the testing is to provide a measure of the resistance of a steel plate to lamellar tearing. (See Appendix X1.)
1.2 The values stated in either inch-pound units or SI units are to be regarded as standard. Within the text, the 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.
1.3 This specification is 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 to inch-pound units.
General Information
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Standards Content (Sample)
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Designation: A 770/A770M – 86 (Reapproved 2001)
Standard Specification for
Through-Thickness Tension Testing of Steel Plates for
Special Applications
This standard is issued under the fixed designation A 770/A770M; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 4.1.1 Two tests shall be required from each plate-as-rolled,
2 except for plates subjected to heat treatment by quenching and
1.1 This specification covers the procedures and accep-
tempering. Two tests shall be required from each quenched-
tance standards for the determination of reduction of area using
and-tempered plate. The tests shall be representative of the
a tension test specimen whose axis is perpendicular to the
plate in its final condition.
rolled surfaces of steel plates 1 in. [25 mm] and greater in
4.1.2 When plates are furnished by the manufacturer in an
thickness. The principal purpose of the testing is to provide a
unheat-treated condition and qualified by heat-treated speci-
measure of the resistance of a steel plate to lamellar tearing.
mens (including normalized, normalized and tempered, and
(See Appendix X1.)
quenched and tempered), two tests shall be required from each
1.2 The values stated in either inch-pound units or SI units
plate-as-rolled.
are to be regarded as standard. Within the text, the SI units are
shown in brackets. The values stated in each system are not
NOTE 1—The term “plate-as-rolled’’ refers to the unit plate rolled from
exact equivalents; therefore, each system must be used inde-
a slab or directly from an ingot. It does not refer to the condition of the
plate.
pendently of the other. Combining values from the two systems
may result in nonconformance with the specification.
4.2 Location of Test Coupons—Take one test coupon at each
1.3 This specification is expressed in both inch-pound and
end of each plate as defined in 4.1. Take the test coupons from
SI units. However, unless the order specifies the applicable
the center of the plate width.
“M” specification designation (SI units), the material shall be
4.3 Orientation of Test Specimens—The longitudinal axis of
furnished to inch-pound units.
the reduced section of the test specimens shall be perpendicular
to the rolled surface of the plate.
2. Referenced Documents
4.4 Preparation of Test Specimens:
2.1 ASTM Standards:
4.4.1 Welded Prolongations—When required, join welded
A 370 Test Methods and Definitions for Mechanical Testing
prolongations to the surface(s) of the plate being tested. The
of Steel Products
joining method used shall be one which results in a minimal
heat-affected zone in the portion of the plate to be tested.
3. Ordering Information
Shielded metal arc, friction, stud, or electron-beam welding
3.1 The inquiry and order shall include the following, if
methods have proven to be suitable.
required:
4.4.2 Types of Test Specimens:
3.1.1 Supplementary requirements that are available to meet
4.4.2.1 Three types of standard round tension test specimens
end use requirements (see S1 through S5).
are shown in Fig. 1 and Table 1. For Types 1 and 2 specimens,
3.1.2 Special requirements agreed upon between the manu-
locate the center of the length of the reduced section at the
facturer and the purchaser.
approximate mid-point of the plate thickness. For Type 3
specimens, locate the weld fusion line of one plate surface
4. Tension Tests
within ⁄4 in. [6 mm] of one end of the reduced section.
4.1 Number of Tests:
4.4.2.2 For plates from 1 in. [25 mm] to 1 ⁄4 in. [32 mm]
inclusive in thickness, use either the 0.350-in. [8.75-mm] Type
1 specimen or the 0.500-in. [12.5-mm] Type 2 specimen.
This specification is under the jurisdiction of ASTM Committee A-1 on Steel,
4.4.2.3 For plates over 1 ⁄4 in. to 2 in. [50 mm] inclusive in
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee
A01.11 on Steel for Boilers and Pressure Vessels.
thickness, use the 0.500-in. [12.5-mm] Type 2 specimen.
Current edition approved Feb. 28, 1986. Published April 1986. Originally
4.4.2.4 For plates greater than 2 in. [50 mm] in thickness,
published as A 770 – 80. Last previous edition A 770 – 82.
2 use the Type 3 specimen.
For ASME Boiler and Pressure Vessel Code applications, see related Specifi-
cation SA-770/SA-770M in Section II of that Code.
Annual Book of ASTM Standards, Vol 01.03.
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
A 770/A770M – 86 (2001)
NOTE—For Type 3 only one welded prolongation may be needed,
depending upon plate thickness.
FIG. 1 Standard Round Tension Test Specimens
TABLE 1 Schedule of Standard Test Specimens, Inches
A
[Millimetres]
Specimen Type
FIG. 2 Alternative Tension Test Specimens
Plate thickness(t)1 # t # 1 ⁄4 1< t #22< t
Diameter(D) 0.350 [8.75] 0.500 [12.5] 0.500 [12.5]
1 3 3
Radius, minimum(R) ⁄4 [6] ⁄8 [10] ⁄8 [10]
3 1 1
Length of reduced 1 ⁄4 [45] 2 ⁄4 [60] 2 ⁄4 [60]
4.4.3.2 For plates over 1 in. [25 mm] in thickness, a series
section(A)
of button-head specimens shown in Fig. 2 and Table 2 may be
A
See Test Methods and Definitions A 370 (Fig. 5 for further details and Fig. 6 for
used. The test specimen type to be used, Type D, Type E, or
various types of ends).
Type F, is determined by the nominal plate thickness as
described in Table 2. A series of two or more Type F specimens
may be used to cover the full thickness of the plate. The length
4.4.3 Alternative Test Specimens—The alternative test
of the reduced section (A), as shown in Fig. 2 and specified in
specimens in Fig. 2 and Table 2 may be used in place of the
Table 2, is the length of the reduced section excluding the
standard specimens in Fig. 1 and Table 1, subject to agreement
machined radius (R). Within the plate thickness dimension
between the manufacturer and the purchaser.
specified for each test specimen type, either the button-head
4.4.3.1 For plates over 2 in. [50 mm] in thickness, Type A or
thickness, the reduced section length, or the machined radius
Type B specimens may be used. The Type A specimen provides
may be varied. In all cases, the minimum length of the reduced
a reduced section length greater than the plate thickness. The
section must be as specified in Table 2 to maintain a minimum
Type B specimen provides a reduced section length of 2 ⁄4 in.
length to diameter ratio (see Appendix X2.2).
[57 mm] with its center at the mid-thickness of the plate. Over
a minimum plate thickness determined by the specimen end
5. Acceptance Standards
configuration, no welded prolongations may be needed for the
Type B specimen. For plates over 4 ⁄4 in. [108 mm] in 5.1 Each tension test shall have a minimum reduction of
area no less than 20 %. If the reduction of area of both tests is
thickness, the standard round tension test specimen Type C
may be used. For plates over 6 in. [150 mm] in thickness, a less than 20 %, no retest shall be permitted. If the reduction of
area of one of the two tests from a plate is less than 20 %, one
series of two or more Type A or Type C specimens with
reduced sections of 4 in. [100 mm] or less may be used to cover retest of two additional specimens taken from a location
the full thickness of the plate. The number of tests required will adjacent to the specimen that failed may be made, and both of
depend upon the thickness of the plate being tested and the these additional specimens shall have a reduction of area of
reduced section length selected. 20 % or more.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
A 770/A770M – 86 (2001)
TABLE 2 Schedule of Alternative Test Specimens, Inches [Millimetres]
Specimen Type
A A B
A B C DEF
1 3 3 1 1
Plate thickness(t)2< t 2< t 4 ⁄4 < t 1 # t # 1 ⁄4 1 ⁄4 < t # 2 ⁄2 2 ⁄2 < t
[50 < t] [50 < t] [108 < t] [25 # t # 45] [45 # t # 64] [64 < t]
C C C
Diameter(D) 0.500 [12.5] 0.500 [12.5] 0.500 [12.5] 0.250 [6.25] 6 0.350 [8.75] 6 0.500 [12.5]
0.005 [0.10] 0.007 [0.18] 6 l0.010
[0.25]
3 3 1
Radius, min(R) ⁄8 [10] ⁄8 [10] ⁄16 [10] optional optional optional
1 1 1
Length of reduced section t + ⁄4 min 2 ⁄4 [60] t −1 ⁄2 0.625 [16] 0.875 [22] 1.250 [32]
min(A) [t +6] [t − 38]
A
See Test Methods and Definitions A 370 (Fig. 5 for further details and Fig. 6 for various types of ends).
B
See Test Methods and Definitions A 370 (Fig. 6, specimen 3 for further details).
C
The reduced section may have a gradual taper from the ends toward the center, with the ends not more than 1 % larger in diameter than the center (controlling
dimension).
5.2 Failures occurring in the prolongations, the weld, or in
the fusion line shall be considered as a “no-test,’’ and an
additional specimen shall be tested.
6. Marking
6.1 Plates accepted in accordance with this specification
shall be identified by stamping or stenciling ZT adjacent to the
marking required by the applicable product specification.
SUPPLEMENTARY REQUIREMENTS
These requirements apply only when specified by the purchaser.
S1. Tensile Strength Requirements S4. Number of Tests
S1.1 Tensile strength shall conform to a minimum value
S4.1 A greater number of tests th
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