GOST 25577-83

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  ГОСТ 25577-83

GOST 25577−83 Profiles steel bent closed welded square and rectangular. Specifications (with Amendments No. 1, 2)

GOST 25577−83

Group B22

INTERSTATE STANDARD

PROFILES STEEL BENT CLOSED WELDED
SQUARE AND RECTANGULAR

Specifications

Steel bent closed welded square and rectangular sections.
Specifications

OFC 7700 11

Date of introduction 1984−01−01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of ferrous metallurgy of the USSR

2. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards from 05.01.83 N 6

3. INTRODUCED FOR THE FIRST TIME

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

5. Limitation of actions taken by Protocol No. 3−93 Interstate Council for standardization, Metrology and certification (ICS 5−6-93)

6. EDITION with Amendments No. 1, 2 approved in February 1988, July 1989 (IUS 5−88, 11−89)


This standard applies to steel bent closed welded square and rectangular sections, intended for use in agricultural machinery, tractor and other sectors of the economy.

1. ASSORTMENT

1.1. Cross-section profiles must match what is specified on the devil.1 and 2.

 — profile height;  — width;  — thickness of the profile;  — the radius of curvature;
 — the resistance moment; is the moment of inertia; radius of inertia;
 — the static moment of polyacene;  — the cross-sectional area

1.2. The dimensions of the profiles, the cross-sectional area reference values for the axes and mass of 1 m of the profile should match:

for profiles of carbon quiet and low-alloy steel — table.1 and 2;

for profiles of carbon and boiling semi-killed steel table.3 and 4.

Table 1

Table 2

Table 3

Table 4

Note to table.1−4. Given in the tables the cross-sectional area and reference values calculated based on nominal sizes.
When calculating the mass of 1 m of the profile the density of steel is taken to 7.85 g/cm.

1.3. Maximum deviations in thickness of sections should correspond to the limit deviations on thickness workpiece width 1000−2000 mm-normal accuracy of rolling B, is given in GOST 19903. Maximum deviations in thickness do not apply to places of bending.

By agreement with the consumer allowed the production of profiles from billets of high accuracy rolling A.

1.4. Limit deviations in height and width of the profile must not exceed:

Limit deviations in height (width) of the profile with a wall thickness of 7−8 mm shall not exceed ±2 mm.

1.5. Profiles are produced with a length of 9 to 11.8 m:

the measured length;

of random length.

Note. Allowed by agreement between manufacturer and consumer in the production of profiles of random length with random lengths from 3 to 9 m.

1.6. Maximum deviations along the length of the profiles measured length, multiple lengths shall be not more than +60 mm.

1.5, 1.6. (Changed edition, Rev. N 1).

1.7. Extreme deviation from the 90° angle must not exceed ±1°30'. Extreme deviation from the 90° angle for profiles with a wall thickness of 7−8 mm should be no more than ±2°.

Example of designation bent welded profile height 180 mm, width 75 mm, wall thickness 5 mm:

Profile

(Changed edition, Rev. N 1).

2. TECHNICAL REQUIREMENTS

2.1. Closed welded profiles are produced in accordance with the requirements of this standard for technological regulations approved in the prescribed manner.

(Changed edition, Rev. N 1).

2.1 a. Closed welded profiles made from hot-rolled steel with provide weldability of carbon steel grades st3sp, St3ps, St3kp GOST 14637, GOST 16523, brands and 20ps at 20 GOST 1050 and low alloy steel grades 09Г2 according to GOST 19281 and 18ЮТ on the other 14−1-4303.

(Changed edition, Rev. N 2).

2.2. Technical profile requirements — according to GOST 11474 with additions.

2.2.1. The curvature profiles in the horizontal and vertical planes should not exceed 0.1% of the measured length.

2.2.2. Twisting of profiles around the longitudinal axis should not exceed the 30' length of profile in meters and should be no more than 5°.

2.2.3. Convexity and concavity of the walls of the profiles should not exceed 1 mm. profile size mm 160х120х3 convexity or concavity of a wall should not exceed 2 mm.

2.2.4. Any crooked areas of the cutting plane to the longitudinal axis of the profile shall not exceed 1°30'. Allowed fire trimming the ends of the individual profiles.

2.2.5. The displacement of the welded edges relative to each other must not exceed:

0.5 mm thickness of profile walls up to 4 mm;

1 mm and the wall thickness of the profiles is more than 4 mm.

The height of residual burrs protruding above the surface profile should not exceed 1.0 mm. grat is removed from the outside.

(Changed edition, Rev. N 1).

2.2.6. Lack of fusion of the individual locations of the welded joint should not exceed 20 mm, the total length of incomplete fusion on 1 m of length in the thickness profile of 6 mm — 50 mm, with the thickness of 7−8 mm — 70 mm.

2.2.7. Weld strength should not be lower than the strength of the base metal.

2.2.8. Requirements PP.2.2.5−2.2.7 are provided at a confidence level of 0.95.

3. ACCEPTANCE RULES

3.1. Rules of acceptance GOST 11474.

4. TEST METHODS

4.1. Test methods — according to GOST 11474 with additions.

4.1.2. Test of welded joint tensile — according to GOST 6996.

4.1.3. Dimensions of cross-sections determined at a distance of 100 mm from the end.

4.1.4. Limit deviation of the profile height and the measurement of convexity and concavity are controlled by nesvorny the wall profile.

(Changed edition, Rev. N 1).

4.1.5. The curvature of the profiles, the concavity and convexity define a metal line (GOST 427).

4.1.6. Twisting and any crooked areas of the cutting plane profile is determined by the protractor (GOST 5378).

4.1.7. The offset edges and the height of residual burrs is determined by the caliper (GOST 166).

4.1.8. The continuity of the welded connection is determined visually, without the use of magnifying devices.

5. PACKAGING, LABELING AND TRANSPORTATION

5.1. Packing, marking and transportation is made according to GOST 11474.