A105 is forged carbon steel
per ASME material group 1.1
The equivalent casting is A216 WCB, i.e.
unless you have any problems in buying a cast body valve the material is ok.


regards
Mogens

ASTM A105 and A216-WCB (or their ASME SA equivalents) are two different product forms.  A/SA105 is a forged material specification while A/SA216-WCB is a cast material specification.  The chemical composition for each material is essentially the same (low carbon steel) but there may be some very minor differences in exact ranges of minor elements.  Get copies of both material specifications and check them out for yourself.

What size valve are you trying to buy?  What is the fluid service and design conditions of your application?  

If you are purchasing a commercially mass produced valve then you will be subject to what the valve manufacturer produces or has in stock.  Valves 1/2" through 2" NPS are generally forged body valves.  If you are buying a valve larger than 2" NPS then you are generally going to get a cast body.  If you really want a forged valve body for your ball valve that is larger than 2" NPS, you will probably need to go to a specialty valve manufacturer and have one custom engineered to your specifications.  Such companies include Valvetron (Houston), Valvetech (Houston), and QAP (Oakland, CA), among others in the USA.  I am less familiar with companies outside of the US.  There may be some companies that offer both cast and forged bodies for ball valves in sizes larger than 2" NPS without going the custom engineering route but I am not personnally familiar with any.  

Evaluate your application and judge whether a cast body will work for you or if you still need a forged body.  

The answer of KSTaylor gives you the full scenario regarding to this two material specifications, when it comes to valve bodies material.

Please, be aware of the facility you are purchasing this valve for MUST have a "Piping Material Specification" (commonly referred as: "Piping Class") where you will find the valve caracteristics for every single service in "your" plant ... use it!! ... so you'll keep using the same materials the plant already have installed (for operation & maintenance this is a very good practice).  The Piping Class will also let you know wheter you need to buy a flanged; socket-welded or screwed valve.

What is difference between API 5L Gr.B and ASTM A106 Gr.B pipes ?
Milan

A106 Gr.B always is seamless but API 5L Gr.B can be seamless or welded manufactured.Mechanical & chemical properties for these two kind of pipes also slightly different.

Thank you all.
Your infos are valuable to me .
Sincerely,

they are all a carbon steel.
A105 is forged, 206WCB is a casting steel.
Keep in mind that the defects aren't the same none the method of detecting them.
With WCB material body will be thicker than with A105 (factor of 0.8 and the low mechanical properties for casting ).

if ur pressure is not more than 500 psi then u can use a-216 wcb valves, 150 or 300 class, but if u would like to use more than 2000 psi u have not any other option except a-105 forged steel valve,
a-216 valves are avilable and manufacture from 150 class to 600 class
means max working pressure is 900 psi
and a-105 forged steel valves are manufactured for 3000 psi, 6000 psi, 9000 psi, and 12000 psi,,working pressure,,
after that pressure there is no more option excepth needle valve.