CR vs HR
CR vs HR
(OP)
I'm wondering about the structural performance. If you build a welded structure out of the same gauge Hot-rolled steel and obtained a certain performance level and then, replace the same structure with cold-rolled, commercial grade, same gauge material, then, it would perform better or worse under dynamic load?





RE: CR vs HR
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RE: CR vs HR
What is dynamic load to you?
RE: CR vs HR
RE: CR vs HR
RE: CR vs HR
Given you have two steels, same thickness, and same material properties requirements, I think that the resulting difference will be in the Grain Structure and the different chemical compositions needed to reach the required properties due to the cold vs hot working.
Only looking at a finer Grain Structure between CR and HR, how can this effect Formability, forming tolerances, distortion from welding, or strength in the HAZ from welding or Heat treating?
Maybe someone can point me in the direction of some references I can look into regarding this topic?
RE: CR vs HR
RE: CR vs HR
I fear I was too general with my previous question, so I will try to further define it:
We use HSLA for most of our applications due to our criteria for applied stresses and formability. Currently, I would say our most commonly purchased is grade 340 or 410. So, with this in mind, we are mostly limited to ASTM A1008 (CR) or ASTM A1011 (HR) in the NAFTA production region.
Again, my question, when only looking at these two standards, what is the benifit of Cold Rolled vs the Hot Rolled equivilant (given the same grade 410 for both). Analysis of the two standards shows a 2% better min elongation percentage (18% for CR and 20% for HR), and both would meet our specficiations for forming. The chemcial composition limits are the same for both standards. Would one give better forming tolerances, fatigue stregth, tool wear rates, different weld HAZ properties, welding/brazing destortion rates, etc. Is the difference really only the superior surface finish properties with the Cold Rolled specification?
Again, I appreciate if anyone had some recommendation for references on sheet steels in machine design applications it would be a great help to me.
RE: CR vs HR