Prevention of crack failure is the key things for the morden factory. Normally we suggest that steel rolling factory should perapre all the NDT measures such as Eddy Current,MT,SUT,UT,Hardness Testor and so on. After grinding, especially for the accidental roll, we check the hardness ,soft spot ,surface quality which should achieve the requirement.And based years of customer service ,we provide bellow advice that the stock removal is 0.2~0.3mm for work roll,0.4~0.5mm for intermediate roll,0.8~1.2mm for backup roll. We believe that there will be a good perfermance of roll with best care of operator.
|
MT |
EDDY CURRENT |
HARDNESS TEST |
UT |
SUT |
ROUGHNESS TESTER |
|
|
inspection area |
surface |
0~3mm |
surface |
10mm~core |
0~2mm |
surface |
|
area depth (mm) |
0~0.1 |
0~0.2 |
0.1 |
15%~85% ROLL Body |
2*λ |
0 |
|
surface crack |
OK |
OK |
OK |
OK |
||
|
internal crack |
OK |
|||||
|
Bruise (soft point) |
OK |
OK |
||||
|
mechanical hardening |
OK |
OK |