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ASTM E436-03(R2021) pdf free download

ASTM E436-03(R2021) pdf free download.Standard Test Method for Drop-Weight Tear Tests of Ferritic Steels
1. Scope
1.1 This test method covers drop-weight tear tests (DWTT) on ferritic steels with thicknesses between 3.18 mm and 19.1 mm. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
5. Apparatus
5.1 The testing machine shall be either a pendulum type or a vertical-dropped-weight (Note 1) type. The machine shall provide sufficient energy to completely fracture a specimen in one impact. 5.1.1 As a guide in the design of the equipment it has been found that up to 2712 J of energy may be required to completely fracture specimens of steel up to 12.7 mm in thickness with tensile strengths to 690 MPa. N OTE 1—Equipment of the vertical-dropped-weight variety that can be readily modified to conduct the drop-weight tear test is described in Test Method E208. N OTE 2—Current pipeline grade steels take more thn 4kJ at design temperature of -5 °C 5.2 The specimen shall be supported in a suitable manner to prevent sidewise rotation of the specimen. 5.3 The velocity of the hammer (in either type of testing machine) shall be not less than 4.88 m/s.
6. Test Specimen
6.1 The test specimen shall be a 76.2 mm by 305 mm by full-plate-thickness edge-notch bend specimen employing a pressed notch. Fig. 1 presents the dimensions and tolerances of the specimens. The specimens shall be removed from the material under test by sawing, shearing, or flame cutting, with or without machining. N OTE 3—Ifthe specimen is flame cut it is usually difficult to press in the notch unless the heat-affected zone is removed by machining.6.2 The notch shall be pressed to the depth shown in Fig. 1 with a sharp tool-steel chisel with an included angle of 45° 6 2°. Machined notches are prohibited. N OTE 4—The notch radius obtained with a sharp tool-steel chisel is normally between 0.013 mm to 0.025 mm. When many specimens are to be tested, it is helpful to use a jig that will guide the chisel and stop it at the proper depth.
7. Procedure
7.1 In the temperature range from − 73 °C to 100 °C em- ploy the procedure described in 7.1.1 and 7.1.2. 7.1.1 Completely immerse the specimens in a bath of suitable liquid at a temperature within 61 °C ofthe desired test temperature for a minimum time of 15 min prior to testing. Separate the specimens by a distance at least equal to the thickness of the specimen. Make provision for circulation of the bath to assure uniform bath temperature. N OTE 5—Alternatively, other methods of heating and cooling may be used, provided they produce equivalent time at temperature of the specimens. 7.1.2 Remove the specimens from the bath and break as described herein within a time period of 10 s. If the specimens are held out of the bath longer than 10 s return them unbroken to the bath for a minimum of 10 min. Do not handle the specimen in the vicinity of the notch by devices the tempera- ture ofwhich is appreciably different from the test temperature. 7.2 For temperatures outside of the range specified in 7.1 maintain the specimen temperature at the time ofimpact within 4 °C of the desired test temperature. 7.3 Insert the specimen in the testing machine so that the notch in the specimen lines up with the centerline of the tup on the hammer within 1.59 mm. Also, center the notch in the specimen between the supports on the anvil. 7.4 Consider tests invalid if the specimen buckles during impact. N OTE 6—Buckling has been experienced with specimen thicknesses less than 4.75 mm.

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