hot rolled steel cutting problem
hot rolled steel cutting problem
(OP)
hi,
we have a trumpf laseer cutter in our workshop, and I would like to ask for help.
there is a specific material finish what the machine does barely cut.
I'm looking for someone, who can explain me what is this material finish.
so our clients often get their material to cut it. I've meet a few times this strange, red-ish surface.
I met it in S235 and S355 quality too. but there was materials with the same quality with grey surface too.
have somebody met this red surface?
as far as I remember, I red at least two different manufacturers on those plates.
it has something to do with the JR, J2+N, JR+N codes after in the material specification?
we have a trumpf laseer cutter in our workshop, and I would like to ask for help.
there is a specific material finish what the machine does barely cut.
I'm looking for someone, who can explain me what is this material finish.
so our clients often get their material to cut it. I've meet a few times this strange, red-ish surface.
I met it in S235 and S355 quality too. but there was materials with the same quality with grey surface too.
have somebody met this red surface?
as far as I remember, I red at least two different manufacturers on those plates.
it has something to do with the JR, J2+N, JR+N codes after in the material specification?





RE: hot rolled steel cutting problem
RE: hot rolled steel cutting problem
RE: hot rolled steel cutting problem
RE: hot rolled steel cutting problem
here are some photos about the plates, and some pieces that I've cut from it.
the cutting is very rough, the edges are rough, the cutting has huge slag on the bottom, I have to hit with the hammer to get the pieces out from the table.
it looks like the molted material can not leave the cut, and on the bottom it welds together.
I have seen at least two different manufacturers on those plates. but I've seen normal, grey tables from those manufacturers too, with the same grade.
this week, one of our client got the material for an order. he brought 5 plates, of the same grade. 3 of them were with this red finish, and 2 were normal grey colored. of course I was suffering to work with the red plates. when i cut the greys, I didn't change anything in technology tables, either feed or pressure, every single piece fall out from table, and they had a very nice cutting edge.
so it has nothing to do with any machine setting (alignment, focus position, ...), it is something with the material.
a little video how it was cutting hese 15mm thick, s235 grade mild steel, with reddish finish
http://www.youtube.com/watch?v=4LEWOOlQ824
and more pics
I tried to burnish it, to get rid of red surface, but no luck
I really would like to resolve this material issue, because a lot of clients bring such material, and always we have to work a lot to get the pieces out of the table than deburr with hammer, and burnish the edges.
any advice would be appreciated.
RE: hot rolled steel cutting problem
RE: hot rolled steel cutting problem
nobody knows what kind of material could be this?
regards,
arnold
RE: hot rolled steel cutting problem
If the material is that problematic to cut I would ask management to look into it and quite possibly establish standards/requirements for customer supplied material.
RE: hot rolled steel cutting problem
Of course I would establish those requirements, but I don't know haow to exclude this type of material. The certificates of these materials show exactly the same as the normal grey tables.
RE: hot rolled steel cutting problem
I got a tip.
Somebody says, maybe during fabrication, the hot rolled steel plate is cooled with water.
Can somebody comment this tip?
regards
arnold
RE: hot rolled steel cutting problem
1. Red Oxide primer (as mentioned in an earlier post)
or
2. This steel may in fact be weathering steel (also known as Corten steel)
I wish I could help more, but that's all I've got.
RE: hot rolled steel cutting problem
RE: hot rolled steel cutting problem
thanks for the comments they were very instructive.
although I realised in this week that the red finish is paint.
it can be washed with water but not completely, and the normal cut parameters are right in 90%.
somebody told me to try some welding protection solution to wash it.
i will try it for sure, but if somebody has a comment on this too, I really would appreciate it.
regards,
arnold