ASTM A370:19 pdf download

ASTM A370:2019 pdf download.Standard Test Methods and Definitions for Mechanical Testing of Steel Products.
10. Plate-Type Specimens
10.1 The standard plate-type test specimens are shown in Fig. 3. Such specimens are used for testing metallic materials in the form of plate, structural and bar-size shapes, and flat material having a nominal thickness of /16 in. (5 mm) or over. When product specifications so permit, other types of specimens may be used.
NOTE 4—When called for in the product specification. the 8-in. (200-mm) gauge length specimen of Fig. 3 may be used for sheet and strip material.
11. Sheet-Type Specimen
11.1 The standard sheet-type test specimen is shown in Fig.
3. This specimen is used for testing metallic materials in the form of sheet, plate, flat wire, strip, hand, and hoop ranging in nominal thickness from 0.005 to I in. (0. I 3 to 25 mm). When product specifications so permit, other types of specimens may be used, as provided in Section 10 (see Note 4).
12. Round Specimens
12.1 The standard 0.500-in. (12.5-mm) diameter round test specimen shown in Fig. 4 is frequently used for testing metallic materials.
12.2 Fig. 4 also shows small size specimens proportional to the standard specimen. These may be used when it is necessary to test material from which the standard specimen or specimens shown in Fig. 3 cannot be prepared. Other sizes of small round specimens may be used. In any such small size specimen it is important that the gauge length for measurement of elongation be four times the diameter of the specimen (see Note 5, Fig. 4).
12.3 The type of specimen ends outside of the gauge length shall accommodate the shape of the product tested, and shall properly fit the holders or grips of the testing machine so that axial loads are applied with a minimum of load eccentricity and slippage. Fig. 5 shows specimens with various types of ends that have given satisfactory results.
13. Gauge Marks
13.1 The specimens shown in Figs. 3-6 shall be gauge marked with a center punch, scribe marks, multiple device, or drawn with ink. The purpose of these gauge marks is to determine the percent elongation. Punch marks shall he light, sharp, and accurately spaced. The localization of stress at the marks makes a hard specimen susceptible to starting fracture at the punch marks. The gauge marks for measuring elongation after fracture shall be made on the flat or on the edge of the flat tension test specimen and within the parallel section; for the 8-in, gauge length specimen. Fig. 3, one or more sets of 8-in. gauge marks may be used, intermediate marks within the gauge length being optional. Rectangular 2-in, gauge length specimens, Fig. 3, and round specimens, Fig. 4, are gauge marked with a double-pointed center punch or scribe marks. One or more sets of gauge marks may be used: however, one set must be approximately centered in the reduced section. These same precautions shall be observed when the test specimen is full section.