Abstract： ASME B31T:2021 pdf download.Standard Toughness Requirements for Piping. 4.5.2 LateraL Expansion Requirements. Carbon and low-alloy steels and other materials having specified mimmum tensile strengths equal to or greater than 656 MPa (95 ksi...

ASME B31T:2021 pdf download.Standard Toughness Requirements for Piping.

4.5.2 LateraL Expansion Requirements. Carbon and low-alloy steels and other materials having specified mimmum tensile strengths

equal to or greater than 656 MPa (95 ksi), all bolting materials, and all high- alloy steels (P-Nos. 6,7, and 8) shall have a

lateral expansion opposite the notch olnot less than 0.38mm (0.015 In.) for all speci men sizes. The lateral expansion is the

increase in width of the broken impact specimen over that of the unbroken specimen measured on the compression side, parallel to

the line constituting the bottom of the V-notch (see ASTM A370). For bolting materials with specified minimum tensile strength

greater than 656 MPa (95 ksi) and size less than or equal to M50 (2 in.), the impact requirements of ASTM A320 may be applied.

4.5.3 WeLd Impact Test Requirements. Where two base metals having different Impact acceptance criteria are joined by welding., the Impact acceptance criteria for the weld metal shall be those of the base material having a specified minimum tensile strength most closely matching the specified minimum tensile strength of the weld metal.

4.5.4 Retests

4.5.4.1 For Absorbed Energy Criteria. When the average value of the three specimens equals or exceeds the minimum value permitted

for a single specimen and the value for more than one specimen is below the required average value, or when the value (or one

specimen is below the minimum value permitted for a single specimen, a retest of three additional specimens shall be made. The

value for each of these retest specimens shall equal or exceed the required average value.

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