INTERSTATE STANDARD

HOT ROLLED STEEL CHANNELS

Assortment

Hot-rolled steel channels.

Date of introduction 2002-01-01

Instead of GOST 8240-89

1. Scope

This standard specifies the range of hot-rolled steel channels for general and special purposes with a height of 50 to 400 mm and a flange width of 32 to 115 m.

2. Basic parameters and dimensions

2.1 In terms of shape and size, channels are manufactured in the following series:

Y - with a slope of the inner edges of the shelves;

P - with parallel flange edges;

E - economical with parallel flange edges;

L - light series with parallel flange edges;

С - special.

Symbols of quantities characterizing the properties of the channel:

h - height (channel);

b - shelf width;

s - wall thickness;

t - shelf thickness;

R - radius of inner rounding;

r - flange radius;

X0 - distance from the Y-Y axis to the outer edge of the wall;

Δ - shelf skew;

f - deflection of the wall along the height of the profile section;

F - cross-sectional area;

I - moment of inertia;

W - moment of resistance;

i - radius of gyration;

Sx - static half-cut moment.

2.2 The cross-section of U, C series channels must correspond to that shown in Figure 1, P, E, L series - in Figure 2.

2.3 Dimensions of channels, cross-sectional area, mass of 1 m and reference values ​​for axles must correspond to those given in tables 1-5.

2.3.1 The cross-sectional area and mass of 1 m of the channel are calculated from the nominal dimensions, the density of the steel is taken to be 7.85 g /cm 3 .

Figure 1 Figure 2

Table 1

Channels with sloped inner flange edges

Table 2

Channels with parallel flange edges

Table 3

Economical channels with parallel flange edges

Table 4

Channel bars of light series with parallel flange edges

Table 5

Special channels

2.3.2 The values ​​of the radii of rounding, the slope of the inner edges of the shelves, indicated in Figures 1 and 2 and given in tables 1-5, are used to build calibers and are not controlled on the profile.

2.4 The shape of the channel and the maximum dimensional deviations must correspond to those given in Figure 3 and Table 6.

2.4.1 The slope of the inner edges of the flanges of U-series channels should be in the range from 4% to 10%. By agreement between the consumer and the manufacturer, the slope of the inner edges of the shelves should not exceed 8% at h 300 mm.

2.5 The blunting of the right angles of channels up to No. 20 should not exceed 2.5 mm, over No. 20-3.5 mm. Dullness of the outer corners is not controlled.

2.6 Channel bars are manufactured in lengths from 2 to 12 m, by agreement between the consumer and the manufacturer - over 12 m long:

- measured length; - measured length with unmeasured in an amount of not more than 5 % of the batch weight; - multiple measured length; - multiple measured length with unmeasured in an amount of not more than 5% of the batch weight; - unmeasured length; - limited length within unmeasured.

Figure 3

Table 6

Limit deviations of parameters

2.7 Maximum deviations along the length of channels of measured and multiple measured lengths should not exceed:

for lengths from 2 to 8 m incl. - up to +40 mm;

"" St. 8 m - up to + [40 + 5 ( l - 8)] mm, but not more than 100 mm ,

where l - channel length, m.

2.8 Channel bars must be cut. The slant of the cut should not bring the length of the channels beyond the maximum deviations in length.

The length of a separate channel is the maximum length of a conventionally cut bar with ends perpendicular to the longitudinal axis.

2.9 The curvature of the channel in the horizontal and vertical planes should not exceed 0.2% of the length; by agreement between the manufacturer and the consumer - up to 0.15% of the length.

2.10 Maximum deviations by weight should not exceed ± 4% for a batch and ± 6% for a single channel.

Weight deviation is the difference between the actual weight as delivered and that calculated from tables 1-5.

When calculating the mass of the batch, 0.5 of the sum of the maximum deviations along the length of the channels in the batch is added to the footage of channels of measured or multiple measured length.

2.11 The dimensions and geometric shape of the channel are controlled at a distance of at least 500 mm from the end. The height of the channel is controlled in the plane of the wall, the thickness of the wall - at the end of the profile.

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