GOST 21449-75

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  ГОСТ 21449-75

GOST 21449−75 Rods for surfacing. Specifications (with Amendments No. 1, 2, 3, 4)

GOST 21449−75

Group В05

STATE STANDARD OF THE USSR

RODS FOR SURFACING

Specifications

Rods for welding deposit. Specifications

OKP 19 7220

Date of introduction 1977−01−01

INFORMATION DATA

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

DEVELOPERS:

V. I. Veprintsev, V. P. A. Kiselev-Lyamin, V. N. Braschin, V. A. Ermakov, L. V. Mikhailova

2. APPROVED AND promulgated by the decree of the State Committee of standards of Ministerial Council of the USSR from 31.12.75 N 4115

3. REPLACE GOST 11545−65 in part of bars

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

5. The expiration TIME LIMIT is REMOVED by resolution of the USSR State Committee on management of quality and standards from 05.04.91 N 448

6. REPRINT (March 1994) with Amendments No. 1, 2, 3, 4, approved in July 1977, November 1986, December 1987, April 1991, (IUS N 10−81, 11−86, 12−87, 7−91)


This standard applies to bars designed for surfacing wear-resistant layers on machine parts and equipment, working in conditions of abrasive wear, impact loads, corrosion, erosion at elevated temperatures or in aggressive environments.

The requirements of this standard are mandatory.

(Changed edition, Rev. No. 4).

1. BRAND

1.1. Depending on the chemical composition of the rods for surfacing are made in the following grades:

PR-С27 (type PRN-У45Х28Н2СВМ),

PR-В3К (type PRN-У10ХК63В5),

PR-В3К-R (type PRN-У20ХК57В10).

(Changed edition, Rev. No. 2, 3).

1.2. Scope rods for surfacing are listed in Annex 1.

2. TECHNICAL REQUIREMENTS

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

The chemical composition of rods for surfacing should conform to the standards specified in table. 1.

Table 1

Table 1 continued

Codes brands of rods for surfacing are given in Appendix 2.

(Changed edition, Rev. No. 1−3).

2.2. Rods for welding Deposit is made in the form of cast rods with polished or rough surface.

Bars and rods, of alloy grades PR-В3К-R and PR-В3К diameter 4 and 5 mm is made of polished, hortovanyi or treated corundum.

(Changed edition, Rev. No. 4).

2.3. Dimensions and limit deviations of rods for surfacing shall be as specified in table. 2.

At the request of the customer can be the production of rods with a diameter of 14, 22, 33 and 45 mm with maximum deviation in diameter ±1.5 mm, length from 300 mm and above.

Table 2

mm

Note. Allowed bars and rods of alloy PR-В3К-R with a length of 250 mm and above.


(Changed edition, Rev. No. 2, 3).

2.4. The hardness of the deposited layer must match specified in table.3.

Table 3

(Changed edition, Rev. No. 2, 3).

2.5. On the surface bars are not permitted fin, burrs of more than 0.5 mm, inclusions of slag, metal penetration.

3. ACCEPTANCE RULES

3.1. Rods for welding Deposit taking parties. The party consists of bars in the same bottoms, same brand, same size, drawn up by one document on quality.

(Changed edition, Rev. No. 4).

3.2. To determine the chemical composition, hardness, absence of slag inclusions in the rods for surfacing from each party selected six bars.

The content of manganese, tungsten, molybdenum, sulfur, phosphorus, in bars, on the basis of iron and manganese, Nickel, antimony, sulfur and phosphorus in bars cobalt-based technology provided by the manufacture and is determined by the requirement of the user.

(Changed edition, Rev. No. 4).

3.3. To determine the size and surface condition of bars in each batch taken 25 bars.

3.4. If unsatisfactory test results of at least one of the indicators it is carried out re-testing at twice the sample selected from the same batch. The results of repeated tests apply to the entire party.

4. TEST METHODS

4.1. Sampling and sample preparation

4.1.1. Samples for the determination of the chemical composition selected by a cutter or a cutter of hard alloy according to GOST 3882−74.

Four rods left for the determination of chemical composition and control the hardness of the deposited layer, and two bars keep for three months in case of disagreement in quality assessment.

4.2. Diameter rods for welding check of the measuring tool to ensure the required measurement accuracy.

The length of bars of the alloy check pattern.

4.3. Surface condition of bars to check by inspection without the use of magnifying devices.

4.4. The content of major elements and impurities determined according to GOST 11930.9−79−11930.12 GOST-79.

You can define the contents of the main elements of the spectral methods.

(Changed edition, Rev. No. 1, 3).

4.5. Hardness

The method is based on a gas welding rods for three samples with subsequent measurement of the hardness of the deposited layer.

4.5.1. Equipment and materials

Burner G2 or G3 with a tip with a fuel gas flow rate of 300−400 l/h according to GOST 1077−79.

Grinding wheels, green silicon carbide hardness M1, M2, M3, CM1 and grit 25−16 and 40−25 according to GOST 2424−83.

Compressed gases — oxygen GOST 5583−78 and acetylene according to GOST 5457−75.

The drill according to GOST 8429−77, calcined at 105−115 °C for 20−30 min.

Samples of steel grade St45 according to GOST 1050−88 steel grade or St3 according to GOST 380−88 (see drawing). The differences in quality evaluation sample should be of steel grade St45.

(Changed edition, Rev. No. 2).

4.5.2. Testing

The welding rods produce a reducing flame in a single layer with the subsequent polishing of the deposited layer abrasive tool of green silicon carbide; wherein the thickness of the deposited layer after grinding should be not less than 1.5 mm. as a flux use of calcined borax.

The hardness of the deposited layer is determined according to GOST 9013−59, scale C, load 150 kgs. On each sample produced five dimensions.

(Changed edition, Rev. No. 2, 4).

4.5.3. Processing of the results

For the final test result should be the arithmetic mean of the results of 15 measurements.

5. MARKING, PACKAGING, TRANSPORTATION AND STORAGE

5.1. The end of each rod is marked with paint-enamel according to GOST 7930−73 in the form of stripes in the following colors:

(Changed edition, Rev. No. 2, 3).

5.2. Rods for surfacing packaging wrapped in waterproof paper GOST 8828−89, bitumen paper according to GOST 515−77, paper, or polyethylene film according to GOST 10354−82 and placed in wooden boxes of the type II-1 according to GOST 2991−85. The gross mass of the box must not exceed 50 kg.

Packaging for welding rods, are designed for areas far North and remote areas shall be in accordance with the requirements of GOST 15846−79, the group «Metals and metal products."

5.3. Cargo marking and handling the sign «Afraid of dampness» — according to GOST 14192−77.

5.2, 5.3. (Changed edition, Rev. No. 2).

5.4. In each box put a document indicating:

a) the trademark or of the trademark and name of the manufacturer;

b) brand of rod;

C) the batch number;

d) gross and net mass;

d) the stamp of the technical control Department;

e) designation of this standard.

(Changed edition, Rev. No. 1).

5.5. (Deleted, Rev. No. 2).

5.6. Packed bars and rods for surfacing transporterowych by all kinds of transport in covered vehicles in accordance with the rules of cargo transportation applicable to transportation of this species. When transporting by rail — carload shipments.

Consolidation packages in overpacks — GOST 26663−85 for mechanical loading. The boxes shall be sealed in accordance with the requirements of GOST 21650−76 (steel tape according to GOST 3560−73, or wire according to GOST 3282−74) and mounted on pallets according to GOST 9570−84. Dimensions of packages — according to GOST 24597−81. Transport packages must be wrapped in longitudinal and transverse directions. Transportation of bars for welding in the impact of climatic factors — the graveyard 15150−69, storage group 5 (ОЖ4).

(Changed edition, Rev. No. 2, 4).

5.7. Storage rods for surfacing — according to GOST 15150−69, group storage conditions L.

ANNEX 1 (recommended). SCOPE RODS FOR SURFACING

ANNEX 1
Recommended

(Changed edition, Rev. No. 2, 3).

ANNEX 2 (mandatory). OKP codes

ANNEX 2
Mandatory

(Changed edition, Rev. No. 3)