GOST 6713-91

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  ГОСТ 6713-91

GOST 6713−91 rolled low-alloy structural for bridge building. Specifications

GOST 6713−91

Band Q23

INTERSTATE STANDARD

ROLLED LOW-ALLOY STRUCTURAL FOR BRIDGE BUILDING

Specifications

Low-alloyed structural rolled stock for bridge building. Specifications

ISS 77.140.50
OKP 09 7100, 09 2500

Date of introduction 1992−07−01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Railways of the USSR and the Ministry of transport construction of the USSR

2. APPROVED AND promulgated by the Decree of Committee of standardization and Metrology of the USSR from 06.09.91 N 1430

3. REPLACE GOST 6713−75

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

5. REVISED (September 2009)


This standard applies to plate, broadband (universal), shaped, flat and long products, intended for the manufacture of bridge structures normal and Northern performances.

1. BRAND AND ASSORTMENT

1.1. Rentals are made from steel grades: 16D, 15KHSND and 10KHSND.

1.2. Rental of steel grades 15KHSND and 10KHSND depending on the type of heat treatment is made of three categories:

category 1 — without heat treatment;

category 2 — in the normalized condition;

category 3 — heat-treated condition after quenching and high holidays.

Shapes of categories 2 and 3 is made by agreement between manufacturer and consumer.

Category in the order specified after the name of the brand. Example: 15KHSND-3.

In the absence of such instructions produced a rental of category 1. Category 1 in the name of a brand of car is not specified.

1.3. In the cross-sectional shape, dimensions and limit deviations of the hire must meet the requirements of GOST 19903, 82 GOST, GOST 8509, 8510 GOST, GOST 8240, GOST 8239, GOST 103.

Deviation from flatness shall conform to the requirements of GOST 19903 worksheets high flatness (PV), leg, curvature of the strip — GOST 82 for class A, the curvature of corners — GOST and GOST 8509 8510 — not more than 0.2% of the length. By agreement with the consumer allowed the curvature of the corners of not more than 0.4% of the length.

Examples of symbols:

Rental hot-rolled thick plate, the normal accuracy of rolling (B), high flatness (PV), with cut edges (O), size 10х1500х8000 mm, of steel 15HSND, category 1:

Rental hot-rolled thick plate, the normal accuracy of rolling (B), high flatness (PV), with cut edges (O), size 32х1600х11000 mm, of steel 10KHSND, category 3:

Corner angle hire the usual accuracy of rolling (B), the size 100х100х10 mm of steel grade 16D:

Rental broadband (universal) conventional precision Rebrovo curvature, class A, size 15х250 mm of steel 10KHSND, category 1:

2. TECHNICAL REQUIREMENTS

2.1. Rental made in accordance with the requirements of this standard for technological regulations approved in the prescribed manner.

2.2. Features

2.2.1. Chemical composition of steel shall conform to the standards given in table.1.

Table 1

Notes:

1. In steel, aluminium killed, the residual acid content of aluminium should be less than 0.02%. Allowed the use of other deoxidizers, it should be ensured that all the requirements of the standard.

2. Analysis of rolled steel 16D on chromium and Nickel and all grades for arsenic and nitrogen is carried out at the request of the consumer.

3. Rentals bridge structures North of the execution of the mass fraction of sulfur should not be more than 0,030%, phosphorus not more than 0,025%; the requirement is established in the order.

By agreement with the consumer it is allowed manufacture of steel electroslag remelting; in the designation of the steel grade is added with a hyphen, the letter sh.

4. In the finished rolled steel 15KHSND category 3 mass fraction of carbon should be no more than 0.18%. The lower value of the mass fraction of carbon in the steel 15KHSND category 3 is not a rejection indication if the mechanical properties are satisfactory.

5. In the rolled steel 10KHSND category 3 mass fraction of silicon should be 0,70%-1,00%.

6. In the rental of steel grade 16D when the mass fraction of carbon 0,10%-0,12% allowed the increase of the mass fraction of manganese, 0.80%.

2.2.2. Mass fraction of nitrogen in the steel should not exceed 0.008%, arsenic — 0.08 percent. Allowed mass fraction of nitrogen in the finished rolled up to 0,012%.

2.2.3. Ready hire provided that the mechanical properties and other requirements of this standard allowed variations in the mass fraction of the elements from the rules given in table.1. The allowable maximum deviations are given in table.2.

Table 2

2.2.4. Rental produce with assurance of weldability. Weldability of steels is ensured by the manufacturing techniques and compliance with all requirements for chemical composition and mechanical properties.

2.2.5. Mechanical properties and impact toughness of rolled steel 16D must conform to the standards given in table.3, rolled steel of other grades — table.4. For products with thickness in excess of specified in tab.3 and 4, norms of mechanical properties are established by agreement between manufacturer and consumer.

Table 3

Notes:

1. Legend:  — mandrel diameter  — the thickness of the hire.

2. In the determination of impact strength on samples of type 3 according to GOST 9454 impact toughness should be 10 j/cm(1 kgf·m/cm) the above are given in table.3.

3. The toughness of products with thickness less than 5 mm is not defined.

4. Sheet metal thickness of 16 mm and more are made in the normalized condition. Subject to the fulfilment of all requirements of the table.3 products can be manufactured without heat treatment.

Table 4

Notes:

1. The rolled steel 10KHSND with a thickness of 16 mm or more and brand 15KHSND thickness of 33 mm and more category 1 is not produced.

2. In the determination of impact strength on samples of type 3 according to GOST 9454 impact toughness should be 10 j/cm(1 kgf·m/cm) the above are given in table.4.

3. At the request of the consumer, the toughness of structural shapes of steel category 1 brands 10KHSND and 15KHSND thickness 11 mm or less, determined at a temperature of minus 60 °C or -70 °C, while the impact toughness shall conform to the standards table.4 for the test temperatures.


At the request of the consumer testing the impact strength of the steels 15KHSND-3 and 10KHSND-3 carried out on samples of type II, the indicators shall meet the requirements of table.5.

Table 5

2.2.6. To obtain the desired mechanical properties carrying out normalization or hardening with high tempering in the manufacture of hire category 1 and quenching with high vacation — in the manufacture of hire of category 2.

2.2.7. Rental for bridge structures North of execution shall be tested in bending on a wide sample at normal temperature in accordance with the requirements of GOST 5521; requirement is specified in the order. In this case, the bending test according to GOST 14019 is not carried out.

2.2.8. For sheets of thickness 10 mm and over shall be tested to fracture notched specimens.

The structure of the rental to the fracture must be uniform and not be visible to the naked eye defects: traces of shrinkage, porosity, cracks and gas bubbles.

The break is not allowed volosovichi individual and small bundles with a length of over 10 mm for products with thickness up to 25 mm, inclusive over 15 mm of rolled of a thickness exceeding 25 mm. the total length of wooloowin and small bundles should not be more than 20 mm for products with thickness up to 25 mm inclusive more than 30 mm for rolling thickness over 25 mm.

2.2.9. For rental of bridge structures North of the execution of a thickness of 10 mm or more fracture notched specimens of thickness equal to the thickness of the sheet, should have a fibrous structure on the area not less than 50% marks for steels 10KHSND and 15KHSND.

2.2.10. The continuity of the hire should correspond to classes 1, 2, according to GOST 22727.

2.2.11. The surface of the sheet and broadband rolled must meet the requirements of GOST 14637, and shapes, flat and long products to the requirements of GOST 535.

2.2.12. The leaves should be cropped from all sides. On the edges of the leaves should be free of rips or tears, traces of shrinkage, porosity and gas bubbles.

By agreement between manufacturer and customer can be manufactured sheets without trimming the longitudinal edges.

Bundle of rentals is not allowed.

Sheets laminated on the machines continuous rolling, is allowed to produce with the uncircumcised (rolled) edges. Available on edges tears should not exceed half the permissible variations in width of the sheet, and output sheet for nominal size width.

2.2.13. Welding and sealing of defects on the surface and edges of sheets, strips and profiles are not allowed.

2.3. Marking rolled — GOST 7566.

2.3.1. Transport marking under GOST 14192.

2.4. Packaging, the formation of packs and bundles of rolled — GOST 7566.

2.4.1. Packaging rolled to the far North and equated localities — according to GOST 15846.

3. ACCEPTANCE

3.1. Rental apply to the acceptance of the parties. Party rental, made out of slabs from continuous casting of steel should consist of the rental of the same brand, same thickness, one mode of heat treatment, and the party rolled from ingots of the same melting — ladle. The attached shorts with installations of continuous casting in the formation of parties, the difference in the mass fraction of carbon should not exceed 0,04% and the mass fraction of manganese is 0.15% (for the analysis of ladle samples).

The party is allowed to pick from:

a) profiles with varying wall thickness or diameter not more than 3 mm;

b) sheets and strips of a thickness up to 10 mm inclusive, wherein a thickness of not more than 2 mm;

in) sheets and strips of a thickness more than 10 mm, wherein a thickness of not more than 4 mm.

Each batch is accompanied by a document of quality according to GOST 7566 indicating additional data:

categories of hire;

the type and mode of heat treatment (if carried out);

the manufacture of slabs by continuous casting;

the results of the inspection of continuity by ultrasound (if performed).

For rental, designed for the manufacture of bridge structures North of execution, weight of the batch shall not be more than 25 t, and for the design of standard rental category 3 — not more than 75 tons, in other cases more mass melting — ladle.

3.1.1. To check the quality of hire from each party select two sheets, two lanes or two other profile. On demand of the consumer sheet and broadband rolled for bridge structures North of the execution of thickness 10 mm and more control on each sheet, and strip.

3.1.2. Check continuity of steel plate for bridge structures in North the execution is carried out on each sheet, heavy plate and broadband rolling for bridge structures standard — as agreed between manufacturer and consumer.

3.1.3. If unsatisfactory test results of at least one of the indicators, repeat tests performed on the sample selected according to GOST 7566.

The results of repeated tests apply to the entire party.

4. TEST METHODS

4.1. For chemical analysis samples are taken in accordance with the requirements of GOST 7565.

Chemical analysis carried out according to GOST 12359, GOST 18895, GOST 22536.0 to GOST 22536.12,GOST 27809, GOST 28473. Allowed the use of other methods providing the required accuracy of the analysis.

If there is disagreement with standard methods specified in this standard.

4.2. Sampling for mechanical and technological tests (tensile, impact strength and bending) is carried out according to GOST 7564.

4.3. To determine the impact strength take two samples from each of two sheets, strips and other profiles in the delivery state and after mechanical aging and three samples of type II from a single sheet of each heat.

Samples for test of sheet metal, except specimens for impact bending type II, cut across the direction of rolling, and the samples of broadband (universal), strip, fittings, long products and the impact strength of the type II cut along the direction of rolling.

For the tensile test and the bending of two samples.

To test fracture and to determine the fibrous fracture — one sample.

The lack of stratification check all sheets, strips and profiles. Allowed the consumer the lack of stratification to control after cutting, welding, straightening and other technological operations.

4.4. The surface quality of the rolled controlled visually.

Rolling in the absence of delamination is controlled by the inspection of edges and ends without the use of magnifying devices. It allowed the use of the device type IGT-10НК or other such class. When visual detection of the separation quality of hire are additionally checked by the removal of chips. The split chip is a sign of discontinuity flaws of metal.

4.5. A wide selection of samples for bend test carried out according to GOST 5521.

4.6. The tensile test is carried out according to GOST 1497.

4.7. Test for impact strength is carried out according to GOST 9454. For products with thickness from 5 to 10 mm the test is performed on samples of type 3, rolled to a thickness of 10 mm or more, type I and II.

For samples from rolled steel of thickness 5 and 10 mm are allowed two rough surfaces; it allowed testing of samples of these thicknesses of rental with minus tolerance.

4.8. Determination of impact strength after mechanical aging is carried out according to GOST 7268. For termorasshirennogo rental allowed prior deformation by compression.

4.9. The bend test is carried out in accordance with the requirements of GOST 14019, GOST 5521.

4.10. Sample fracture for rental from 15KHSND steel grades, 10KHSND and 16D is cut across the direction of rolling of the sheet means. The incision is performed mechanically. The sample breaks down static load application. Allowed the break to Koper.

4.11. The definition of structure in the fracture and the area of the fracture with a fibrous structure for 15KHSND steel grades, 10KHSND and 16D is carried out according to GOST 5521.

4.12. Continuity plate check ultrasound control according to GOST 22727.

5. TRANSPORTATION AND STORAGE

5.1. Transportation and storage — by GOST 7566 with additions.

5.2. Rental transporterowych rail on the open rolling stock in accordance with the goods transportation regulations applicable to transport of this species. Type of shipment carload.

Loading, fastening and placement of rental must be in accordance with the technical conditions of loading and fastening of cargoes, approved by the Ministry of communications and GOST 22235.