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[잿빛유리]

the tube diameter is subject to the limit deviations specified in table2.

if one of the limit deviations is to be zero, this shall be stated in the order, e.g. instead of (55+-)mm, either(55+0.5)mm or (55-0.5)mm.

the limit deviations for diameters given in table2 allow for ovality and apply for the cold finished (hard) (BK) and cold finished (soft) (BKW) conditions.

for heat treated tubes, i.e. cold finished and stress-relief annealed (BKS), annealed (GBK) or normalized (NBK) tubes, the limit deviations for the diameter increase as a function of the wall thickness/diameter ratio (see table 1).

the dimensions given in table 1 also apply to the inside diameter of steel tubes.

in the case of intermediate sizes, the deviations for the next largest size shall apply.

the limit deviations for wall thickness shall be +-10% of the nominal size and include the concentricity tolerance, which is calculated as a percentage using the following formula:

is the largest wall thickness measured of a tube cross section

the smallest wall thickness measured of a tube cross section

tubes are generally ordered in terms of outside diameter and inside diameter.

where the wall thickness is of significance, the tubes may also be ordered in terms of outside diameter and wall thickness or inside diameter and wall thickness.

in this case, the limit deviations specified here refer only to two of three possible parameters, the deviations for the third being subject to agreement. such tubes shall be ordered in quality grade C.