GOST 21026-75

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ГОСТ 21026-75

GOST 21026−75 hot-rolled steel Channels with curved shelf for trolleys. Assortment (Change No. 1)

GOST 21026−75

Group B22

INTERSTATE STANDARD
HOT-ROLLED STEEL CHANNELS WITH CURVED SHELF TROLLEYS
Assortment
Hot-rolled channel sections with outward flanges for trolleys. Dimensions

ISS 77.140.70
OKP 09 2500

Date of introduction 1977−01−01

The decision of the State Committee of standards of Ministerial Council of the USSR of 28 July 1975 1957 N date of introduction is established 01.01.77

The expiration time limit is removed by the Resolution of Gosstandart No. 896 from 19.06.91

REPLACE GOST 5157−53 in part of steel channel with curved shelf trolleys

EDITION (October 2012) with amendment No. 1, approved in October 1986 (IUS 1−87), Amendment (ICS 9−91)

This standard specifies the gauge hot rolled channels with curved shelf for trolleys.

(Added, Rev. N 1).

1a. For precision-rolled channels are produced:

— high accuracy,

— normal accuracy — V.

Note. The quality is determined based on the quality of steel used in the manufacture of channels.

(Changed edition, Rev. No. 1 Amendment).

1. Cross section of channels with a bent flange must match that specified on the drawing.

Refer to the drawing and table.1 and 2:
— the height of the channel; — the width of the shelf; — the width of the folded shelf;
	— wall thickness; — the average thickness of the shelves; — the radius of the inner curvature; — the radius of curvature of the shelf; — the internal angle of the shelf; is the moment of inertia; — radius of gyration; — distance of center of gravity from the axis ; — distance of center of gravity from the axis .

2. The dimensions of channels, maximum rejections of sizes, the cross-sectional area, weight of 1 m length, and reference values should correspond to those in table.1 and 2.

Table 1

About value Pro — Phil																	The cross — sectional area, cm	Weight 1 m, kg
Nomin.	Pred. off.	Nomin.	Pred. off.	Nomin.	Pred. off.	Nomin.	Pred. off.	Nomin.		Pred. off.
mm														grad
SP-10	100	±2	55	+1,5	40	±1,5	9	+0,7 A 1.0	11	23,0	15,5	11	5,5		123	±30'	18,6	14,6
SP-12	120	±2	60	+1,5	45	±1,5	11	+0,7 A 1.0	13	24,5	17,0	13	6,5		126	±30'	25,5	20,0

Note. The cross-sectional area and weight of 1 m of the channel calculated based on nominal sizes, the density of steel is equal to 7.85 g/cm.

Table 2

Marking profile	Axis		Axis		Axis		Axis		The angle of the axes	see	see
see	see	see	see	see	see	see	see
SP-10	305,50	4,10	From 33.48	1,36	304,19	4,09	34,89	1,38	0,064	4,96	1,50
SP-12	594,75	4,87	55,86	1,49	589,93	4,85	61,72	1,57	0,059	6,025	1,62

The maximum deviations of channels for high accuracy should be no more than: height mm, thickness ±0,7 mm.

(Changed edition, Rev. No. 1 Amendment).

3. The channels produce a length of 2 to 9 m:

— the measured length;

— multiple gauge length.

(Changed edition, Rev. N 1).

4. (Deleted, Rev. N 1).

5. Limit deviations for channel length and multiple dimensional measuring length shall not exceed:

the usual precision:

+40 mm for bars up to 4 m;

+60 mm for a channel length of St… 4 to 6 m;

+80 mm for a channel length of 6 m. St.

high precision:

+40 mm for a channel length of St. 4 m to 7 m and +5 mm for each meter in excess of 7 m.

6. The curvature of the channel in horizontal and vertical planes should not exceed:

0,4% of length — normal accuracy;

0.3% of the length — high precision.

5, 6. (Changed edition, Rev. No. 1 Amendment).

7. Size control is carried out at a minimum distance of 500 mm from the end of the rod. The thickness of the wall of the channel is measured at the end of the rod, the height of the planes .

Control of the thickness of the flanges of channels is carried out according to the caliber rolls when they are boring.

8. Twisting around the longitudinal axis is not allowed.

(Changed edition, Rev. N 1).