| 摘要 |
A metal body member having an integral fitting or coupling portion with selectively hardened port areas including seat and threaded portions. The body member is formed by cutting a transverse blank from extruded material and by subsequently cold working the port area of the blank through plastic displacement of material in the area with an appropriately sized tool. Localized hardening of the port area eliminates the possibility of coupling failure due to over-torquing of the associated fitting components and leaves nonport areas relatively soft for subsequent independent forming operations to complete the body member.
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