The Process

Design Guidelines

STANDARD PROFILE TOLERANCES

HOT EXTRUDED AND STRAIGHTENED – HOLLOW SECTION

A. EXTERNAL DIAMETER D

B. EXTERNAL DIAMETER D

C. DISPLACEMENT OF INTERNAL FORM

X: ± 1 MM

  • Up to 50 mm: ± 0.5 mm
  • Over 50 mm: ± 1%
  • Thickness S: ± 10%
  • (of the nominal thickness)
  • Up to 50 mm: ± 0.5 mm
  • Over 50 mm: ± 1%
  • Thickness: ± 15%
  • Thickness of fin e: ± 0.5 mm
  • Width of fin b: ± 2 mm (or less on agreement)
  • The tolerances of other hollow profile
    shapes must be agreed after study.
    For all other tolerances see table for solid
    section profiles.

STANDARD PROFILE TOLERANCES

HOT EXTRUDED AND STRAIGHTENED – SOLID SECTION

A. DIMENSIONAL TOLERANCES OF THE

TRANSVERSE SECTION:

B.MINIMUM RADII:

C. ANGULAR TOLERANCES:

  • Less than 25 mm ± 0.5 mm
  • from 25 to 75 mm ± 0.8 mm
  • from 75 to 100 mm ± 1.0 mm
  • from 100 to 125 mm ± 1.2 mm
  • over 125 mm ± 1.4 mm
  • Ri = internal radius: minimum 4 mm
  • Re = external radius: minimum 1.5 ± 0.5 mm
  • Type 1 case ± 1°30’
  • Type 2 case ± 0°30’

D.TRANSVERSE CURVATURE:

E.LONGITUDINAL CURVATURE:

F. WARP:

  • X max = 1% of M
  • (or less on agreement)
  • X max. = 0,15% of L
  • Max. deviation of 1mm per
    meter or less (on agreement),
    according to requirements.

G.DIMENSIONAL DIFFERENCES BETWEEN SYMMETRICAL PARTS:

H.DIMENSIONAL DIFFERENCES BETWEEN SYMMETRICAL PARTS:

I. LONGITUDINAL BAR TOLERANCES:

  • Max difference between S and S’
    half tolerance of point A
    e.g. S = S’ = 28± 0.8 mm
    max difference 0.8 mm
    (hypothesis S = 27.6 S’ = 28.4)
  • Max variation:half tolerance at point A
  • e.g.: nominal values
    M = M’ = 80 ± 1 mm
    A = A’ = 40 ± 0.8 mm
    S = S’ = 15 ± 0.5 mm
  • Example:
    M = 79.5 M’ = 80.5
    A = 39.4 A’ = 40.2
    S = 14.75 S’ = 15.75
  • a) from production ± 1 meter
  • b) fixed: ± 2 mm; from 0+10mm (or on request)
  • c) multiple: + 5 mm each multiple (or on request)
  • d) commercial: from 3 meters to 7 meters

Learn more about custom extruded steel profiles.

Color Scheme

Layout:

WIDE   BOXED

Background Pattern