Rolled bar in Forging ASTM certificate (ASTM A182)
Rolled bar in Forging ASTM certificate (ASTM A182)
(OP)
ASTM A 182, which is for forging, permits cylindrical rolled bar, that are 4" and lower in diameter, provided the bar is heat treated, to be certified as ASTM A 182.
A) How and where can we get the basis / rationale behind this permission?
B) Some people advocate that asking for forged cylindrical bar especially small diameter such as 4" and lowers (so long as it is solution annealed, in case of Austenitic stainless steel and meets the mechanical and chemical property) is an overkill, and actually non-sense requirement, since, in the process of making a rolled bar of such small diameter, the work that goes into that eliminates the need for forging process. Is this argument valid?
C) It is my submission that some user prefers forged bar for high fatigue items due to fear of presence of defects and due to fear of micro segregation, and strength along the grain flow will be higher, could this be rationale for one asking for forged bar instead of rolled bar.
D) In a cylindrical rolled cylindrical bar if one does macro section and checks for the grain flow and a forged bar of same size one does the macro section, forged bar and rolled bar will have same kind of macro result on grain flow, is this correct statement?
E) Since the diameter being low, the threat of segregation and threat of presence of injurious defects are reduced to such an extent in a rolled bar (of 4" and lower) that there is no technical difference between forged bar and rolled bar when the size is 4" and less especially when the shape is cylindrical and final required shape is also cylindrical. May (D) and (E) be the rationale behind ASTM A 182 allowing rolled bar to be certified under ASTM that is dedicated for forging?
A) How and where can we get the basis / rationale behind this permission?
B) Some people advocate that asking for forged cylindrical bar especially small diameter such as 4" and lowers (so long as it is solution annealed, in case of Austenitic stainless steel and meets the mechanical and chemical property) is an overkill, and actually non-sense requirement, since, in the process of making a rolled bar of such small diameter, the work that goes into that eliminates the need for forging process. Is this argument valid?
C) It is my submission that some user prefers forged bar for high fatigue items due to fear of presence of defects and due to fear of micro segregation, and strength along the grain flow will be higher, could this be rationale for one asking for forged bar instead of rolled bar.
D) In a cylindrical rolled cylindrical bar if one does macro section and checks for the grain flow and a forged bar of same size one does the macro section, forged bar and rolled bar will have same kind of macro result on grain flow, is this correct statement?
E) Since the diameter being low, the threat of segregation and threat of presence of injurious defects are reduced to such an extent in a rolled bar (of 4" and lower) that there is no technical difference between forged bar and rolled bar when the size is 4" and less especially when the shape is cylindrical and final required shape is also cylindrical. May (D) and (E) be the rationale behind ASTM A 182 allowing rolled bar to be certified under ASTM that is dedicated for forging?





RE: Rolled bar in Forging ASTM certificate (ASTM A182)
RE: Rolled bar in Forging ASTM certificate (ASTM A182)
Such as roll bar permitted, provided that the reduction ratio is greater than XX.
I believe reduction ratio is what is at the root of this.
When the spec was written no one was thin strand casting these alloys so 4" bar was being rolled from 10" or 12" at least.
But what if today someone rolled it from 5"? That is a different animal.
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Plymouth Tube
RE: Rolled bar in Forging ASTM certificate (ASTM A182)
Is there a contact mail ID for ASTM committee?
Does it change from one ASTM to another?
RE: Rolled bar in Forging ASTM certificate (ASTM A182)
You can sen him a letter through ASTM headquarters.
But honestly, I suggest that you join. Dues are cheap and you will learn a lot by sitting through the meetings and talking with the other members.
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Plymouth Tube
RE: Rolled bar in Forging ASTM certificate (ASTM A182)
It is also common to control the diameter or cross section of bar stock used for forging blanks, since the grain properties of the blank can affect the grain properties in the forging.
RE: Rolled bar in Forging ASTM certificate (ASTM A182)
RE: Rolled bar in Forging ASTM certificate (ASTM A182)
RE: Rolled bar in Forging ASTM certificate (ASTM A182)
RE: Rolled bar in Forging ASTM certificate (ASTM A182)
RE: Rolled bar in Forging ASTM certificate (ASTM A182)