Straightening characterization?
Straightening characterization?
(OP)
We have regularly straightening problems with high strengh materials like S355MC, S550MC after a laser cut operation. The elastic limits (355 MPa, 550 MPa) are obtained by thermo-mechanical process and we control these materials by hardness measures and by their chemical analysis(%C, %Mn).... Obviously, these controls don't seem to be sufficient.
Could anyone help us to characterize the straightening ability of this kind of materials?
Thank you
Could anyone help us to characterize the straightening ability of this kind of materials?
Thank you





RE: Straightening characterization?
RE: Straightening characterization?
RE: Straightening characterization?
If this worked, this would take a bite out of your straightening requirements, reducing the severity of the problem.
RE: Straightening characterization?
I do not know the process by which your stainless was produced but being 6mm thick tells me it was probably coiled. If you are a large enough consumer of this material I would look at the possibility of getting materials first which have not been coiled. Secondly some sort of stress relieve, temperature or vibratory. Third have one of the companies toll process a coil. Caution must be taken to not to contaminate the surface of the plate with materials during cold reduction.
Flatness has always been a problem with plate and sheet fabricators and this cold reduction process aided manufacturing greatly and probably help you also.
RE: Straightening characterization?
I confirm that most of our materials are coiled. But we are not a large enough consumer to have a sufficient weight with our suppliers.
After a discussion with one of them, it appears that the content of Mn is very omportant concerning the amount of residual stresses (by the increase of segragtions). Indeed we have less problems with Mn<0.5% whereas Mn~1.4% are very difficult to straightened.
RE: Straightening characterization?
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Corrosion never sleeps, but it can be managed.
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