1006 vs 1010 vs 1016 HRPO

[kritter]

What would you choose and why for a .25 inch HRPO plate with a 2 inch wide bottow die bending 90 degrees + for fabricated structural components?

They have to be nice to cut on the laser cutter as well as nice to bend without cracks forming?

If I order material straight from the mill can silicon content be adjusted with ease or is that an unreal request?

I have my answer to the first question but I want input from others. Our laser/bend department manager came in and asked me to decide on a material from those 3 choices based on ease of cutting and bending without cracking.


I realize that ductility and weldability decrease with increasing Carbon and I also realize that Silicon increases strength and hardness.


Any other suggestions of material?

 

[BillPSU]

I would recommend using a cold reduce flattened decoiled A36 or whatever grade you perfer. Usually when you purchase .250 plate it is actually a coil product which has been reprocessed into plate. The flatness of the plate is always a problem when processing on a punch or laser and coil memory is a problem. Your parts can come out looking like a banana or the skeleton will come up and hit your torch head. Cold reduction can produce a plate with 25% of the published plate flatness and will have no coil memory in the .25 thickness range. If 36ksi strength is not required go to a lower carbon content such as 1010. Formability improves with lower carbon content however it will also hurt machinability with stringier chips.

I've never really had a problem forming A36 with bend radii to thickness of 1 to 1, unless a higher strength material (grade 50 or 60)is substituted.

 

[kritter]

my mistake...it is coil. I call it plate since for R&D work I use plate whereas for production we use coil...

there is no issue with coil memory at this time...only with stress cracking during bending.

 

[deanc]

Are you bending with the grain or across? If it cracks on the corners it may help to knock off the sharp edge. Try not to "coin" but air form. Try to increase your upper die radius. Preheat?

Few ideas,would have to see. It should be doable.

 

[CoryPad]

Since you do not provide any requirements for the product in its end use, I assume they are not critical. Go with the most formable material - 1006.

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[metman]

I second deanc's suggestion to break sharp corners. This was reccommended to me by USS when we had cracking problems when forming 1-1/2" to 4" ASTM A36 plate.

My solution for this was to subtitute ASTM A283 but was shot down by our purchasing manager.

I do not have access to this spec now but as I recall, it has similar mechanical properitie as A36 but maybe not quite 36 ksi yet more ductile in part because max Carbon content is less than max C allowed in A36.

ASTM A 283/A 283M - Complete Document
Revision: 03 Chg: Date: 04/10/03
SPECIFICATION FOR LOW AND INTERMEDIATE TENSILE STRENGTH CARBON STEEL PLATES

 

[kritter]

Edges are all broken and pre heating is not an issue.

AS far as with the grain or against the grain I couldnt tell you since I dont have anything to do with that department...

I was asked what to use, I said 1006 since it is most formable. I wanted more opinions from people who use these materials daily.

Isnt ASTM A36 cold rolled with a higher carbon content then the 3 suggestions I made? Also a much higher cost?

 

[metman]

Isnt ASTM A36 cold rolled with a higher carbon content then the 3 suggestions I made? Also a much higher cost?

kritter,

Yes and maybe A 283 would also be more costly but would likely be higher YS than 1006. Again I don't have current access to the 283 spec.

If 1006 has enough YS, it should fit the bill fine. Also I just reread this thread and it finally sunk in that it is coil. A 283 is a plate callout.