All plates for shell sections and for heads shall be formed to the required shape by any process that will not unduly impair the physical properties of the material.
[ug - 79a]所有用于筒节和封头的板材，应以任何不得过分损伤材料物理性能的方法成形到所需形状。
All plates for shell sections and for heads shall be formed to the required shape by any process that will not unduly impair the physical properties of the material.
[ug - 79a]所有用于筒节和封头的板材，应以任何不得过分损伤材料物理性能的方法成形到所需形状。
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