Date of introduction 07/01/87

1. This standard applies to hot-rolled steel equal-flange angles.

The standard fully complies with ST SEV 255-76.

2. The dimensions of the corners, cross-sectional area, reference values ​​for the axes and the mass of 1 m of the corners must correspond to those indicated in the drawing and in the table. 1.

Table 1

Number corner

Cross-sectional area, cm 2

Reference values ​​for axes

x 0 , cm

y 0 , cm

Jxy cm 4

Corner tilt axes, tga

Weight 1 m corner, kg

Jx, cm 4

Wx, cm 3

Ju, cm 4

Wу, cm 3

iу, cm

Iu min , cm 4

Wu, cm 3

iu min , cm

Notes: 1. Cross-sectional area and reference values ​​are calculated based on nominal dimensions. When calculating the mass of 1 m of corner, the density of steel was taken to be 7.85 g/cm 3 . 2. Radiuses of curvature, shape and dimensions of the mating area of ​​the internal edges of the shelves, indicated in the drawing and in the table. 1, are given for caliber construction and are not checked at the corner. 3. Angles marked with an asterisk are manufactured according to customer requirements.

Symbols for the drawing and table. 1:

IN - width of the larger shelf;

b- thickness of the smaller shelf;

l - shelf thickness;

R- radius of internal curvature;

r- radius of curvature of shelves;

J- moment of inertia;

i- radius of inertia;

x 0 , y 0 - distance from the center of gravity to the outer edges of the shelves;

J xy- centrifugal moment of inertia.

3. According to rolling accuracy, angles are made:

A- high accuracy;

IN- ordinary accuracy.

4. Limit deviations The dimensions of the corners should not exceed those indicated in the table. 2.

table 2

Corner number	Maximum deviations, mm
	along the shelf width	by shelf thickness
		up to 6 incl.		from 6.5 to 9 inclusive.

5. Maximum deviations in the dimensions of angles manufactured on mills not equipped with rigid stands should not exceed those indicated in table. 3 to 01/01/93.

(Changed edition, Amendment No. 1).

6. By agreement between the manufacturer and the consumer, maximum deviations in shelf thickness may be replaced by maximum deviations in mass equal to %.

7. Deviation from right angle at the top should not exceed 35".

Table 3

Corner number	Maximum deviations, mm
	along the shelf width	by shelf thickness
		up to 6 incl.		from 6.5 to 9 inclusive.

8. The blunting of the outer corners of the shelves (including the corner at the apex) is not controlled.

At the request of the consumer, dulling external corners shelves (including the angle at the top) should not exceed:

0.3 shelf thickness - for corners up to 10 mm thick inclusive;

3.0 - for corners with a thickness of St. 10 to 15 mm inclusive;

5.0 - for corners with a thickness of St. 16 mm.

9. Corners are made from 4 to 12 m long:

measured length;

multiple measured length;

unmeasured length;

limited length within unmeasured;

measured length from unmeasured lengths no more than 5% of the batch mass;

multiple measured lengths with unmeasured lengths of no more than 5% of the mass of the batch.

It is allowed to produce corners longer than 12 m.

8; 9. (Changed edition, Amendment No. 1).

10. Maximum deviations in the length of the corners of the measured length or a multiple of the measured length should not exceed in millimeters:

30 - with a length of 4 m;

50 - for lengths over 4 m up to and including 6 m;

70 - for lengths over 6 m;

at customer request +40 mm - for corners longer than 4 to 7 m:

5 mm for every 1 m over 7 m.

11. The curvature of the corners should not exceed 0.4% of the length.

At the request of the consumer, corners are produced, the curvature of which does not exceed 0.2% of the length.

For corners No. 2.5/1.6 up to 5.6/3.6 inclusive. The curvature is checked at a length of 1 m.

12. Twisting around the longitudinal axis is not allowed.

13. The cross-sectional dimensions of the angle are checked at a distance of at least 500 mm from the end of the rod.

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Metallurgy of the USSR, Gosstroy of the USSR

2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee on Standards dated October 15, 1986 No. 3082

4. The validity period was lifted according to Protocol No. 7-95 of the Interstate Council for Standardization, Metrology and Certification (IUS 11-95)

5. EDITION with Amendment No. 1, approved in December 1990 (IUS 4-91)

When constructing reinforcement structures with increased rigidity characteristics, strengthening concrete, connecting handrails, and organizing lintels, steel unequal angles are used. Hot-rolled products are in demand in both civil and private construction. They are used in interior design, shipbuilding and automotive industry, and in the construction of small architectural objects. Rolled metal of this type is widely used even in the production of furniture and interior decoration. Such a wide range of uses is due to the increased strength properties of hot-rolled angles. It is manufactured in accordance with GOST 8510-86, which describes the dimensions, cross-sectional area and other parameters of the product.

Fig.1. Appearance hot rolled steel unequal angle

Hot-rolled unequal flange - L-shaped profile made of various brands become. His distinctive characteristic are the side shelves different sizes- one is larger than the other. According to standard 8510-86, solid rolled metal products are made from:

• Carbon steel (grades 09g2s, st3kp, St0-St6, st4kp, st4ps and 3sp5);
• Low alloy steel (grades 15HSND, 08G2S, 15G2AFDps, 16GS, 10HSND, 12GS, 14HGS).

Other grades of steel are also used. Different sizes of product shelves are effectively used in the construction arched structures, roofing trusses, etc. Hot rolled metal is produced by hot rolling a steel billet. It is passed between the rolls of a rolling mill. The production technology allows us to obtain a corner with an external pointed angle equal to 90 '.

Fig.2. The main quantities described by GOST 8510-86

The dimensions of the corners, reference values ​​for the axes, cross-sectional area, weight must correspond to those indicated in Table 1.

The weight of 1 m of the product depends on the cross section of the profile - from 1.16 cm 2 to 49.77 cm 2. When calculating the mass, it is based on the fact that the density of the steel must be at least 7.85 g/cm 3 . When manufacturing standard products, the weight of 1 m of corner will vary from 0.91 kg to 39.07 kg. Calculation of mass based on metal density is used in the production of rolled metal at the request of the consumer.

What parameters does standard 8510-86 describe?

The current GOST 8510-86 describes:

• ratio of the lengths of the larger and smaller shelves;
• radii of curvature of the ends of the shelves and the internal corner;
• shelf thickness;
• radius and moment of inertia;
• centrifugal moment of inertia.

Fig.3. Designations of the described quantities

In order for rolled metal to comply with the standard, its production must also take into account the distance from the outer edges of the shelves to the center of gravity. GOST also determines the length of the product. It can vary from 4 to 12 m. In this case, hot-rolled steel profile may have:

• measured and unmeasured length;
• multiple measured length;
• within an unmeasured limited length.

It is allowed to produce rolled metal of a larger size (over 12 m in length), but the value of its curvature should still not exceed 0.4% of the length. The standard describes profiles of high (A) and normal (B) accuracy. For both types of products, maximum deviations in dimensions apply. They are shown in the table below.

Tables 2 and 3. Maximum deviation of values

Characteristics of corners and shelves according to the standard

Standard 8510-86 states that the right angle (external, formed by the sides of the profile) at the apex cannot have a deviation from 90′ by more than 35′. At the same time, the blunting of the external corners of the shelves is not controlled by GOST. But when producing products at the request of the consumer, the following recommendations for dulling must be adhered to:

• 0.3 of the shelf thickness for corners up to 10 mm thick;
• 3.0 - for corners with a thickness of 10-15 mm;
• 5.0 - for corners with a thickness of more than 16 mm.

The table below shows the dimensional characteristics of the most popular unequal flange hot-rolled steel angles described by the standard. When manufacturing products, the specified parameters cannot be exceeded.

Table 2. Specifications popular profile types

For unequal angles of measured and multiple measured lengths, deviations along the length should not exceed:

• +30 mm - products up to 4 m;
• +50 mm - for four and six meter profiles;
• +70 - if rolled metal is over 6 m.

When producing hot-rolled steel angles at consumer request with a length of 4-7 m, the deviation should not exceed 40 mm. Further +5 mm for each subsequent meter.

How hot-rolled steel unequal angles are designed in accordance with GOST requirements is shown in the video.

STATE STANDARD

USSR UNION

ASSORTMENT

GOST 8510-86 (ST SEV 255-76)

Official publication

PUBLISHING HOUSE OF STANDARDS

UDC 621.35774:006.354 Group B22

STATE STANDARD OF THE USSR UNION

HOT-ROLLED STEEL ANGLES, UNEVEN FLANGE

Assortment

Hot-rolled steel unequal-leg angles. Dimensions

(CT SEV 255-76)

OKP 09 3100; 09 3200; 09 3300

Date of introduction 07/01/87

1. This standard applies to hot-rolled steel unequal angles.

The standard fully complies with ST SEV 255-76.

2. The dimensions of the corners, cross-sectional area, reference values ​​for the axes and the mass of 1 m of the corners must correspond to those indicated in the drawing and in the table. 1.

Official publication Reproduction prohibited

© Standards Publishing House, 1986 (6) Standards Publishing House, 1993 Reprint with changes

							Reference values

Table 1

									Angle of inclination on the axis, tga

						Cross-sectional area, cm 2	Reference values

Notes:

1. Cross-sectional area and reference values ​​are calculated and taken equal to 7.85 g/cm 3 *

2. The radii of curvature, the shape and dimensions of the internal joint area and at the corner are not checked.

3. Angles marked with an asterisk are manufactured according to customer requirements.

Continuation of the table. 1

									Angle of inclination on the axis, tga

nominal sizes. When calculating the mass of 1 m of a corner, the steel density of the edges of the shelves indicated in the drawing and in the table. 1, given for caliber construction

Symbols for the drawing and table. 1:

B - width of the larger shelf;

b - width of the smaller shelf; t - flange thickness;

R - radius of internal curvature; r is the radius of curvature of the shelves;

J - moment of inertia; i - radius of inertia;

JC0, У о - distance from the center of gravity to the outer edges of the shelves;

Jx y - centrifugal moment of inertia.

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

3. According to rolling accuracy, angles are made:

A - high accuracy;

In - usual accuracy.

4. Maximum deviations in the dimensions of the corners should not exceed those indicated in the table. 2.

table 2

	Limit deviations
			by thickness
Corner number	along the shelf width	up to 6 incl.		from 6.5 to 9 inclusive.

5. Maximum deviations in the dimensions of angles manufactured on mills not equipped with rigid stands should not exceed those indicated in table. 3 to 01/01/93.

Tablida 3

(Changed edition, Amendment No. 1).

6. By agreement between the manufacturer and the consumer, maximum deviations in shelf thickness may be replaced by maximum deviations in mass equal to %.

7. Deviation from the right angle at the apex should not exceed 35

8. The blunting of the outer corners of the shelves (including the corner at the apex) is not controlled.

At the request of the consumer, the blunting of the external corners of the shelves (including the angle at the apex) should not exceed:

0.3 shelf thickness - for corners up to 10 mm thick inclusive;

3.0 - for corners with a thickness of ev, 10 to 15 mm inclusive;

5.0 - for corners with a thickness of St. 16 mm.

9. Corners are made from 4 to 12 m in length: measured length;

multiple measured length; unmeasured length;

limited length within unmeasured; measured length with unmeasured lengths no more than 5% of the batch weight: multiple measured length with unmeasured lengths no more than 5% of the lot weight.

It is allowed to produce corners longer than 12 m.

8; 9. (Changed edition, Amendment No. 1).

10. Maximum deviations in the length of the corners of the measured length or a multiple of the measured length should not exceed in millimeters:

30 - with a length of 4 m;

50 - for lengths over 4 m up to and including 6 m;

70 - for lengths above 6 m;

at customer request +40 mm - for corners longer than 4 to 7 m:

5 mm for every 1 m over 7 m.

11. The curvature of the corners should not exceed 0.4% of the length.

At the request of the consumer, corners are produced, the curvature of which does not exceed 0.2% of the length.

For corners No. 2.5/1.6 up to 5.6/3.6 inclusive. The curvature is checked at a length of 1 m.

12. Twisting around the longitudinal axis is not allowed.

13. The cross-sectional dimensions of the angle are checked at a distance of at least 500 mm from the end of the rod.

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the USSR Ministry of Ferrous Metallurgy and the USSR State Construction Committee

DEVELOPERS

S. I. Rudkzh, Ph.D. techies, sciences; V. F. Kovalenko, Ph.D. tech. sciences; N. F. Gritsuk, Ph.D. tech. sciences; K-F. Peretyatko; G. I. Snimshchikova; E. I. Bulgakov; Zh. M, Roeva, Ph.D. econ. sciences; V. I. Krasnova; B. G. Pavlov, Ph.D. tech. sciences;

V. F. Belyaev, Ph.D. technical sciences; V-V- Berezin, Ph.D. tech. sciences;

S. I. Bochkova

2. APPROVED AND ENTERED INTO EFFECT by the Resolution State Committee USSR according to standards dated 10/15/86 No. 3082

3. INSTEAD GOST 8510-72

4. Validity period extended until 07/01/97 by Decree of the USSR State Standard dated 28L2.90 No. 3429

5. REISSUE (March 1993) with Change No. 1, approved in December 1990 (IUS 4-91)

Editor L, V, Afanasenko Technical editor V. I. Malkova Proofreader L. Ya. Mitrofanova

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