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发表于 2008-1-21 17:28
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来自： 中国山东德州
Standard ASTM A 131M covers structural steel-shapes, plates, bars, and rivets intended primarily for use in ship construction. Material under specification A 131M is available in the following categories:
• Ordinary Strength — Grades A, B, D, DS, CS, and E with a specified minimum yield point of 235Mpa, and
• Higher Strength — Grades AH, DH, and EH with specified minimum yield points of either 315MPa or 350 MPa. |
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