Steel oil problem
Steel oil problem
(OP)
We have a tank with 11 tons of cold oil (50 grades C) with the cooling speed of 75 grades C/s. Out of 2000 rolls 100Cr6(52.100), only 10-15 rolls have high levels of bainite , aprox 40-60% and harndness of 30-50 HRC. It is possible that the oil is bad or could be another reason of this problem?





RE: Steel oil problem
If the problems are randomly distributed w/r to time of the run, then you've got a steel supply problem of varying steel consistencies, not a heating problem.
If the problem is physically distributed according to where the rolls are stored on the floor or how they are placed in the oven, then you've got a heat creation (oven) geographic problem: some too hot, some parts too cool. On the floor, maybe some rolls are close to a heat source or fan or open door where they are cooling differently. .
RE: Steel oil problem
As racookpe1978 has mentioned, a little more investigation into the problem can lead to a solution. If only 10-15 out of 2000 are out-of-tolerance, that is better than 99% good, which indicates that the process is capable, you just need to adjust the process controls to eliminate the source of the out-of-tolerance condition. With a better understand of the process (batch or continuous) and your current controls, the internet may be able to help, but a carful review of the process by someone who is close to it (yourself, perhaps) will likely be more productive.
As I said, I doubt the oil is "bad", but if you have doubts, you need to check it out. More likely, it is related to the issues racookpe1987 has brought up.
Good Luck,
rp
RE: Steel oil problem