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  • 1.  Mechanical props of Cb7CU-1 forged.

    Posted 12-12-2023 06:47

        We have no Data for Cb7Cu -1 Forged.   



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    Brian Seviour
    Mr
    BG Consulting
    Hartbeespoort
    (082) 416-2456
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  • 2.  RE: Mechanical props of Cb7CU-1 forged.

    Posted 12-12-2023 08:04

    Cb7Cu-1 is a casting designator for precipitation hardened 17-4 stainless steel.  For wrought material, you can find properties in ASTM A564. 



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    Xiaoli Tang
    Swagelok Company
    Solon OH
    (440) 649-5328
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    IMAT Conference & Expo


  • 3.  RE: Mechanical props of Cb7CU-1 forged.

    Posted 12-12-2023 11:36

    Good grief. If so, that is the most misleading alloy  designation I've ever seen. 



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    James Cotton
    Technical Fellow, Retired
    N/a,Consultant
    Issaquah WA
    (425) 223-8060
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  • 4.  RE: Mechanical props of Cb7CU-1 forged.

    Posted 12-12-2023 13:30

    Many thanks.

    Brian Seviour.




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    IMAT Conference & Expo


  • 5.  RE: Mechanical props of Cb7CU-1 forged.

    Posted 12-13-2023 03:26

    Thanks to all, who responded and commented.

    Regards,

    Brian Seviour. 



    ------------------------------
    Brian Seviour
    Mr
    BG Consulting
    Hartbeespoort
    (082) 416-2456
    ------------------------------

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    IMAT Conference & Expo


  • 6.  RE: Mechanical props of Cb7CU-1 forged.

    Posted 12-12-2023 10:42
    Wouldn't forged CB7Cu-1 be 17-4PH?



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  • 7.  RE: Mechanical props of Cb7CU-1 forged.

    Posted 12-13-2023 09:29

    Just add to this discussion:

    1. Complete designation of "Cb7Cu-1" is CB7Cu-1 per ASTM A747. UNS designation is J92180. It is a casting counterpart of 17-7 PH per ASTM A693 (and many others depending on the form).
    2. Even though CB7Cu-1 is similar to 17-7 PH, it is not same as 17-7. Designating it as "cast 17-7 PH" is erroneous. The chemical compositions of the two are quite different with columbium and copper additions, reduced level of Cr and Ni and removal of Al.
    3. CB7Cu-1 properties are dependent on the heat treatment and section thickness. A summary of the properties can be found in: https://castingquality.com/castings-picture/Casting-Material-Precipitation-Hardening-Stainless-Steel-17-4-PH.pdf
    4. Microstructure of the two compositions are quite different due to different processing routes, leading to a lower corrosion performance of CB7Cu-1.


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    [Ratnesh] [Dwivedi]
    [President]
    [RKD ENGG, LLC]

    www.rkdengg.com
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    IMAT Conference & Expo


  • 8.  RE: Mechanical props of Cb7CU-1 forged.

    Posted 12-15-2023 08:57
    1. CB7Cu-1 per ASTM A747t is a casting counterpart of 17-4 PH (Type 630) per ASTM A693 (plate) and A705 (forgings).
    2. The composition of CB7Cu-1 is almost the same as 17-4 PH (Type 630), but is not exactly identical. In general, the main difference is the slight reduction of Ni in the cast product. Other than that, the CB7Cu-1 composition lies within the Type 630 limits. Neither has any required Al content. (This is not to say that Al is not present or added. Small amounts, probably less than 0.05% residual, may be used for deoxidation.)
    3. Microstructures of both products after heat treatment will largely consist of tempered martensite.

    --
    John Grubb



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  • 9.  RE: Mechanical props of Cb7CU-1 forged.

    Posted 12-13-2023 12:58

    David Coulston pointed, and I agreed, to errors in my in my previous post. Here is the corrected version:

    1. Complete designation of "Cb7Cu-1" is CB7Cu-1 per ASTM A747. UNS designation is J92180. It is a casting counterpart of 17-4 PH per ASTM A564 or A705. 
    2. Even though CB7Cu-1 is similar to 17-4 PH, it is not same as 17-4. Designating it as "cast 17-4 PH" is erroneous. The chemical compositions of the two are quite different.
    3. CB7Cu-1 properties are dependent on the heat treatment and section thickness. A summary of the properties can be found in: https://castingquality.com/castings-picture/Casting-Material-Precipitation-Hardening-Stainless-Steel-17-4-PH.pdf
    4. Microstructure of the two compositions are quite different due to different processing routes, leading to a lower corrosion performance of CB7Cu-1.


    ------------------------------
    [Ratnesh] [Dwivedi]
    [President]
    [RKD ENGG, LLC]

    www.rkdengg.com
    ------------------------------

    Original Message
    IMAT Conference & Expo