2021-06-24_REVISION - M2012032 - Laserfiche WebLink

Home Browse Search

ASME B31.3-2016 Table 323.3.4 Charpy Impact Test reduction corresponding to the actual material thickness Temperature Reduction and the temperature reduction corresponding to the Actual Charpy specimen width actually tested. Material Thickness [See Para. 323.3.4(b)] Temperature 323.3.5 Acceptance Criteria or Charpy Impact Reduction (a) Minimum Energy Requirements. Except for bolting Specimen Width Below Design materials,the applicable minimum energy requirement Along the Notch Minimum for carbon and low alloy steels with specified minimum [Note(1)] Temperature tensile strengths less than 656 MPa(95 ksi)shall be those mm in. °c °F shown in Table 323.3.5. 10 (full size 0.394 0 0 (b) Lateral Expansion Requirements. Other carbon and standard bar) low alloy steels having specified minimum tensile strengths equal to or greater than 656 MPa (95 ksi), all 9 0.354 0 0 bolting materials,and all high alloy steels (P-Nos. 6, 7, 8 0.315 0 0 and 8)shall have a lateral expansion opposite the notch 7.5 (/4 size bar) 0.295 2.8 5 of not less than 0.38 mm (0.015 in.) for all specimen 7 0.276 4.4 8 sizes. The lateral expansion is the increase in width of 6.67 (/3 size bar) 0.262 5.6 10 the broken impact specimen over that of the unbroken 6 0.236 8.3 15 specimen measured on the compression side,parallel to 5 ('/z size bar) 0.197 11.1 20 the line constituting the bottom of the V-notch (see 4 0.157 16.7 30 ASTM A370). 3.33 (/3 size bar) 0.131 19.4 35 (c) Weld Impact Test Requirements. Where two base 3 0.118 22.2 40 metals having different required impact energy values 2.5 ('/4 size bar) 0.098 27.8 5o are joined by welding, the impact test energy require- ments shall conform to the requirements of the base GENERAL NOTE: These temperature reduction criteria do not apply material having a specified minimum tensile strength when Table 323.3.5 specifies lateral expansion for minimum required values. most closely matching the specified minimum tensile NOTE: strength of the weld metal. (1) Straight line interpolation for intermediate values is permitted. (d) Retests (1) For Absorbed Energy Criteria. When the average 323.3.4 Test Temperatures. For all Charpy impact value of the three specimens equals or exceeds the mini- tests, the test temperature criteria in para. 323.3.4(a) or mum value permitted for a single specimen and the (b)shall be observed. The test specimens,as well as the value for more than one specimen is below the required handling tongs,shall be cooled for a sufficient length of average value, or when the value for one specimen is time to reach the test temperature. below the minimum value permitted for a single speci- (a) For Materials of Thickness Equal to or Greater Than men, a retest of three additional specimens shall be 10 mm (0.394 in.). Where the largest attainable Charpy made.The value for each of these retest specimens shall V-notch specimen has a width along the notch of at least equal or exceed the required average value. 8 mm(0.315 in.),the Charpy test using such a specimen (2) For Lateral Expansion Criterion. If the value of shall be conducted at a temperature not higher than lateral expansion for one specimen in a group of three the design minimum temperature. Where the largest is below 0.38 mm (0.015 in.) but not below 0.25 mm possible test specimen has a width along the notch less (0.01 in.), and if the average value for three specimens than 8 mm,the test shall be conducted at a temperature equals or exceeds 0.38 mm (0.015 in.), a retest of three lower than the design minimum temperature by the additional specimens may be made,each of which must amount shown in Table 323.3.4 for that specimen width. equal or exceed the specified minimum value of 0.38 mm (b) For Materials With Thickness Less Than 10 mm (0.015 in.). In the case of heat treated materials, if the (0.394 in.). Where the largest attainable Charpy V-notch required values are not obtained in the retest or if the specimen has a width along the notch of at least 80% values in the initial test are below the minimum allowed of the material thickness,the Charpy test of such a speci- for retest, the material may be reheat treated and men shall be conducted at a temperature not higher than retested.After reheat treatment,a set of three specimens the design minimum temperature. Where the largest shall be made. For acceptance, the lateral expansion of possible test specimen has a width along the notch of each of the specimens must equal or exceed the specified less than 80% of the material thickness, the test shall minimum value of 0.38 mm (0.015 in.). be conducted at a temperature lower than the design (3) For Erratic Test Results. When an erratic result minimum temperature by an amount equal to the differ- is caused by a defective specimen or there is uncertainty ence(referring to Table 323.3.4)between the temperature in the test procedure, a retest will be allowed.