SA-564 type 630 H1150 & Code Case 2156-1
SA-564 type 630 H1150 & Code Case 2156-1
(OP)
I am intending to manufacture a Pressure Vessel Housing (cylindrical shaped over 4" Bore). I note that SA-564 type 630 H1150 requires a minimum reduction in area of 50% for material sizes up to 8". The material I intend to use is greater than 8" therefore am I correct in assuming when I conduct the additional transverse tests in accordance with code case 2156-1, then the minimum required reduction of area is 30%?





RE: SA-564 type 630 H1150 & Code Case 2156-1
Although Code-Case 2156-1 states that the reduction-of-area shall not be less than 30%
It also states afterwards 'For those materials for which the material specification requires a reduction-of-area value greater than 30%, the higher value must be met'
RE: SA-564 type 630 H1150 & Code Case 2156-1
RE: SA-564 type 630 H1150 & Code Case 2156-1
I would assume that the values in the mechanical properties table are valid up to 8" bar and the values above that may be lower than stated and would have to be accepted with a concession. Personally I would still want the material over 8" to meet the 50% ROA, and through personal experience such material does exceed this value.
However, I could be very wrong and hopefully someone else on the forum will be able to enlighten us...
RE: SA-564 type 630 H1150 & Code Case 2156-1
The ASME Code Case was issued to address using bar in pressure retaining applications and as part of this use, there are additional testing requirements to follow. However, this cannot be used as card blanch for material that is not within the scope of ASME/ASTM.
I would suggest you review ASME Section VIII, Div 1 pressure retaining materials and look into a forging rather than bar to accomplish what you need.
RE: SA-564 type 630 H1150 & Code Case 2156-1
Could it be possible though that certain Authorized ASME Inspectors would approve the use of bar with OD greater the 8"?
Thanks
RE: SA-564 type 630 H1150 & Code Case 2156-1
For certain applications AND the material specification has listed mechanical properties for the wrought product dimension. In your case, where are the allowable stresses going to come from regarding this material above 8" diameter?
RE: SA-564 type 630 H1150 & Code Case 2156-1
RE: SA-564 type 630 H1150 & Code Case 2156-1
RE: SA-564 type 630 H1150 & Code Case 2156-1