「黃金螺栓」的長相

[Guo]

贊助商連結

http://www.trustmfg.com/prods2.htm
目前還找不到ASTM A540 B23,B24 圖片 只能以同是核能級使用的照片(但非ASTM標準)
safety related or nuclear fasteners are available.
American Society for Testing and Materials (ASTM) standard A540/A540M-06, “Standard Specification for Alloy-Steel
Bolting Materials for Special Applications,” addresses regular and special-quality alloy steel bolting
materials which may be used for nuclear power plant and other special applications.

ASME (注意喔 非ASTM)Specification SA– 540 / SA-540M

SA 540 / SA 540M is – Specification for alloy-steel bolting materials for special applications. Its scope covers regular and special-quality alloy steel bolting materials which may be used for nuclear and other special applications. Five grades of material are covered as under.
Grade Identification Symbol Material
B21 (Cr-Mo-V) Chromium-Molybdenum-Vanadium
B22 (4142-H) Chromium-Molybdenum
B23 (E-4340-H) Chromium-Nickel-Molybdenum
B24 (4340 Mod.) Chromium-Nickel-Molybdenum
B24V (4340V Mod.) Chromium-Nickel-Molybdenum-Vanadium

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