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Subject: low D-to-t ratio tubulars met.sci.
Вновь салютую Друзья! я вернулся после паузы к переводу ASTM ТУ, и возник вопрос по передачи термина low D-to-t ratio tubulars ( мой вариант - трубные изделия с низкими D,t показателями)
10.3 For seamless round structural tubing 23⁄8 in. [60 mm] specified outside diameter and larger, a specimen not less than 21⁄2 in. [65 mm] in length shall be flattened cold between parallel plates in two steps. During the first step, which is a test for ductility, no cracks or breaks on the inside or outside surfaces, except as provided for in 10.5, shall occur until the distance between the plates is less than the value of “H” calculated by the following equation: where:
H = distance between flattening plates, in. [mm],
e =deformation per unit length (constant for a given grade of steel, 0.09 for Grade A, 0.07 for Grade B, and 0.06 for Grade C),
t= specified wall thickness of tubing, in. [mm], and
D = specified outside diameter of tubing, in. [mm]. 10.5 When low D-to-t ratio tubulars are tested, because the strain imposed due to geometry is unreasonably high on the inside surface at the 6 and 12 o’clock locations, cracks at these locations shall not be cause for rejection if the D-to-t ratio is less than 10.
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