cladding of spherical surfaces by stellite

[Himan Nikdin]

Dear Experts;

My ball valve vendor claims that "it is not recommended to clad ball part of ball valve by stellite", I am looking for a reference to find is there any specific  limitation for this material.

The ball material is "SS316L".

If yes, is this limitation applicable for other stainless steel material like "13%Cr".

Thanks

Himan Nikdin

[Venkatesan Mass tech]

Dear sir,
         please give the dimension of the ball valve size.

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[Tapasvi Lolla]

Hello Himan,

One of the main issues that can be encountered is the mismatch in thermal expansion properties when service temperature plays a role (mismatch can also play a role during solidification of clad if the cladding parameters are not crafully chosen) . In such instances cladding is actually good because, due to the dilution, it can create a gradual gradient in such properties and reduce the mismatch. But the dilution zone from the cladding process is known to form sigma phase (hard and brittle phase) at high temperatures. So my questions to you are:

1. What grade of Stellite is going to be cladded

2. What are the service temepratures like. 

[Himan Nikdin]

Dear Sir

The sellite grade is 6, and the operating temperature is less than 100 C.

Regards,

Himan

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Date: Tue, 21 Apr 2015 06:18:51 -0700
From: aceta...@gmail.com
To: material...@googlegroups.com
Subject: Re: [MW:23139] cladding of spherical surfaces by stellite

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/64ff8bb8-20b3-4b53-8719-c3fc6e25873e%40googlegroups.com.