GOST 2879-88

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  ГОСТ 2879-88

GOST 2879−2006 bars, steel hot rolled hexagon. Assortment

GOST 2879−2006
Group B22

INTERSTATE STANDARD

BARS, STEEL, HOT ROLLED HEXAGON

Assortment

Hexagonal hot-rolled steel bars. Dimensions

ISS 77.140.60
OKP 09 3100
09 3200
09 3300

Date of introduction 2009−07−01

Preface

Goals, basic principles and main procedure of works on interstate standardization have been established in GOST 1.0−92 «interstate standardization system. Basic provisions» and GOST 1.2−97* «interstate standardization system. Interstate standards, rules and recommendations on interstate standardization. The procedure of development, adoption, application, renewal and cancellation"
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* Valid GOST 1.2−2009.

Data on standard

1 DEVELOPED by the research Institute «Ukrniimet» Ukrainian state scientific and technical center «Energostal», Interstate technical Committee for standardization MTK 327 «bars, shapes and sections"

2 as AMENDED by the Federal Agency for technical regulation and Metrology

3 ACCEPTED by the Interstate Council for standardization, Metrology and certification (minutes No. 30 dated December 7, 2006)

The standard was accepted by voting:

4 this standard conforms to regional standard EN 10061:2003* «rental hot-rolled steel hexagonal General purpose. Dimensions and tolerances for shape and size» (EN 10061:2003 «Hot rolled hexagon steel bars for general purposes — Dimensions and tolerances on shape and dimensions») in terms of requirements to the assortment.
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* Access to international and foreign documents referred to here and hereinafter, can be obtained by clicking on the link to the site shop.cntd.ru. — Note the manufacturer’s database.

The degree of compliance — non-equivalent (NEQ)

5 by Order of the Federal Agency for technical regulation and Metrology dated September 9, 2008 N 197-St inter-state standard GOST 2879−2006 introduced as a national standard of the Russian Federation from July 1, 2009

6 REPLACE GOST 2879−88

7 REISSUE. October 2012


Information about introduction in action (termination) of this standard is published in the index «National standards».

Information about the amendments to this standard is published in the index «National standards», and the text changes — in the information sign «National standards». In case of revision or cancellation of this standard the appropriate information will be published in the information index «National standards»

1 Scope

This standard applies to hot-rolled steel rolled hexagonal cross-section (hereafter rental) inscribed circle diameter from 8 to 103 mm inclusive.

2 Classification. Basic parameters and dimensions

2.1 rentals are divided as follows:

— accuracy rolling:

high — B1;

ordinary — B1;

— symmetric limit deviations:

high — B2;

common — B2;

— plus extreme deviations in the diameter of the inscribed circle to B3;

— length:

dimensional — MD;

measuring with non-standard length — MD1;
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In the supply of rental with dimensional random length (MD1) dimensional with random length (КД1) and bounded by random length (EA1) is allowed rental of random length not more than 5% of the batch weight.


dimensional — CD;

dimensional with random length — КД1;
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In the supply of rental with dimensional random length (MD1) dimensional with random length (КД1) and bounded by random length (EA1) is allowed rental of random length not more than 5% of the batch weight.


random — ND;

limited within the random — OD;

limited from the random length — EA1;
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In the supply of rental with dimensional random length (MD1) dimensional with random length (КД1) and bounded by random length (EA1) is allowed rental of random length not more than 5% of the batch weight.


in rolls — NMD;

— limit deviations for the length of rental and multiple dimensional measuring length groups, DB and VD;

— the blunting of the angles in BU and WU;

— the curvature on classes: I, II, III, IV.

Figure 1. The nominal inscribed circle diameter, limit deviation, cross-sectional area and weight of 1 m of length of hire

2.2 nominal inscribed circle diameter, limit deviation, cross-sectional area and weight of 1 m of length of hire shall be as specified in figure 1 and in table 1.

Figure 1

Table 1

2.2.1 hire with precision rolling B2 (table 1) allowed to produce with plus extreme deviation equal to the amount of the limit deviation for diameter of inscribed circle (W3).

2.3 rental are made in bars.

By agreement between manufacturer and consumer (the agreed specifications) hire are made in rolls.

2.4 rental produce length from 2 to 6 m, inclusive.

By agreement between manufacturer and consumer (the agreed specifications) hire produce random length in the range of 3 to 13 m, inclusive, with 10% of bars from the batch weight can have a lesser length but not less than 75% of the minimum length.

2.5 Limit deviation made on the length of hire exact or multiple lengths shall not exceed the values given in table 2.


Table 2

2.6 the Difference of the distances between parallel faces rolled in one cross section shall not exceed 75% of the sum of limit deviations stipulated in table 1.

For hire precision B1 inscribed circle diameter up to 32 mm inclusive by agreement between manufacturer and consumer (the agreed specifications) the difference of the distances between parallel faces rolled in one section should not exceed 70% of total extreme deviations stipulated in table 1.

2.7 dulling the corners of the hire groups of BU and VU shall not exceed the values given in table 3.


Table 3

In millimeters

2.8 curvature of the rolled bars should not exceed the values given in table 4.


Table 4

2.9 the curvature of the rolled measured at the site length of at least 1 m at a distance of not less than 100 mm from the end of the rod.

2.10 the Curl of the hire shall not exceed the requirements specified in table 5.


Table 5

2.11 the size of the rental and the blunting of the angles measured at a distance of not less than 100 mm from the end of the rod and at least 1,5 m from the end of a coil with a coil weight up to 250 kg and not less than 3,0 m at a mass skein over 250 kg.

2.11.1 By agreement between manufacturer and consumer (the agreed specifications) dimensions rolled in, dulling the corners and the curvature of the rolled measured at a distance of not less than 150 mm from the end of the rod.