Leaf of steel from 12 to 35 mm of Art. 20 hot-smoked
Hot-rolled sheet steel. GOST 19903-74
Steel sheets hot-rolled 500 mm wide and more, produced in sheets from 0,40 to 160 mm thick and rolls from 1,2 to 12 mm thick.
Sheet steel is subdivided: and
on rolling accuracy at a thickness up to 12 mm:
enhanced accuracy - And,
normal accuracy - B;
especially high planeness - ON,
high planeness - PV,
the improved planeness - PU,
normal planeness - MONDAY;
on character of an edge:
with not cut edge - BUT,
with a cut edge - About;
by the sizes:
Maximum deviations on widthof a steel sheet with the cut edge delivered in rolls should not exceed:
+2 mm - with a width from 500 to 1000 mm;
+5 mm - with a width of St. 1000 up to 1600 mm;
+7 mm - with a width of St. 1600 mm.
with the cut edge delivered in sheets should not exceed:
+6 mm - with a width up to 800 mm;
+10 mm - with a width of St. 800 mm.
with not cut edge should not exceed +20 mm.
Maximum deviations longwise should not exceed the steel sheet rolled polistno:
+10 mm - with a length of sheets up to 1500 mm;
+15 mm - with a length of sheets of St. 1500 mm.
on continuous camps and cut on sheets, should not exceed:
+15 mm - with a length of sheets up to 1500 mm;
+10 mm - at the customer's request;
+20 mm - with a length of sheets over 1500 up to 3000 mm;
+25 mm - with a length of sheets over 3000 mm.
At the customer's requeststeel sheets produce with the following maximum deviations longwise:
+5 mm - with a length of sheets up to 1500 mm;
+6 mm - with a length of sheets St. 1500 to 2000 mm;
+10 mm - with a length of sheets St. 2000 to 3000 mm;
+20 mm - with a length of sheets of St. 3000 mm.
The rolling delivered in steel sheets with a cut edge should be cut off at right angle. The obliquity of the machine cut and crescent form should not remove steel sheets for the rated size.