A182 VS A479 sstainless steel
A182 VS A479 sstainless steel
(OP)
I am about to look into this further so i figured i would post here also.
I know A182 is forging and A479 is bar. Can you eloborate more on the differences of the two. Most of my mill certs state both. What factors must met in order to classify a bar as both?
I know A182 is forging and A479 is bar. Can you eloborate more on the differences of the two. Most of my mill certs state both. What factors must met in order to classify a bar as both?





RE: A182 VS A479 sstainless steel
Do you have both ASTM specifications to review? If not, you need to obtain them to review side by side. If you have a materials background you will see the stated differences in terms of manufacture, required mechanical tests, marking, etc.
The A 479 is a standard stainless steel bar specification, where products supplied under A 479 can be certified under A 182 provided the weight size is followed in the Scope statement of A 182.
RE: A182 VS A479 sstainless steel
I do not have a materials backround i do however have the specs. After reviewing what i am familar with in the 2 specs i see no mentionable differences is chemical, machanical, grain size, hardness requirements..etc..
not for 304 anyway
Even ASME section II allowable stresses @ temps are the same.
i see a difference in reduction of area % min..thats all my untrained eye spots.
Reason i am inquiring is...im pressed for time on a project that requires sa-182 piping component I fabricate. Time only allows me to get 479 in time. I dont see any reason i can not use 479. I am curious as what reason could be given to reject 479.
RE: A182 VS A479 sstainless steel
From a code perspective, ASME B31.3 (and other design codes) do not always list bar stock materials whereas they typically do always list forging material. Check Table A-1 of B31.3 to see if your material is listed or not. If your specific material is not listed in Table A-1 the client could reject it as an "unlisted" material.
RE: A182 VS A479 sstainless steel
RE: A182 VS A479 sstainless steel
Consequently, a forging made to A182 can have significantly better properties and be of higher quality than A479 bar stock material despite the fact that the specified chemistry and minimum mechanical properties shown on the MTR might appear to be the same.
Note that A961 does not allow barstock material to be used for flanges, elbows, return bends, tees and only allows it to be used for other hollow cylindrical parts up to NPS 4 provided the axial length of the part is approximately parallel to the metal flow lines of the starting stock.
If the manufacturer has not certified the material as A182 (without limitation) then it is not A182 material and does not meet the customers specification nor Code requirements if that is what they asked for. You could ask the original manufacturer to review and issue you a new MTR certifying it as A182 material someone other than the manufacturer can not regrade the material on the basis of information presented on an MTR. There is just not sufficient information presented on an MTR to fully assure that all requirements of the original material specification (e.g., A182, A961) were met.