Tolerance On Flatness

The unflatness across the strip (also called cross camber and cross bow) is expressed as a percentage of the strip width. The unflatness along the strip, sometimes called coil-set, is also expressed as a percentage. Unless otherwise agreed upon the measuring length = the strip width for flatness measurements along and across the strip. Influence of possible residual stresses from slitting shall be excluded.

Tolerance	Maximum permitted deviation class(% of nominal strip width)
P0	–
P1	0.4
P2	0.3
P3	0.2
P4	0.1
P5	As per customer`s special requirement

Tolerance class	Strip Width
	8 – (20) mm		20 – (50) mm		50 – (125) mm		125mm~
	Measuring length
	1m	3m	1m	3m	1m	3m	1m	3m
	Maximum allowed straightness deviation (mm)
R1	5	45	3.5	31.5	2.5	22.5	2	18
R2	2	18	1.5	13.5	1.25	11.3	1	9
R3	1.5	13.5	1	9	0.8	7.2	0.5	4.5
R4	1	9	0.7	6.3	0.5	4.5	0.3	2.7
R5	As per customer`s special requirement