GOST 20559-75

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  ГОСТ 20559-75

GOST 20559−75 (ISO 4884−78, ISO 4489−78) hard Alloys, ceramic tool materials. Acceptance rules and sampling methods (with Changes 1, 2, 3, 4)

GOST 20559−75
(ISO 4884−78,
ISO 4489−78)

Group 56

STATE STANDARD OF THE USSR

ALLOYS HARD MATERIALS CERAMIC TOOL

Rules of acceptance and sampling methods

Hard metals, ceramic tool materials.
Regulations of acceptance and methods of sampling

AXTU 1909

Valid from 01.01.76
before 01.01.96*
_______________________________
* Expiration removed by Protocol No. 5−94
The interstate Council for standardization,
Metrology and certification (I & C N 11/12, 1994). -
Note the manufacturer’s database.

INFORMATION DATA

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

DEVELOPERS:

Kudrya N. A. Tumanov V. I., Nechaev N. P.

2. APPROVED AND promulgated by the Decree of the State Committee of standards of Ministerial Council of the USSR from 04.03.75 N 574

3. INTRODUCED FOR THE FIRST TIME

4. Annexes 1 and 2 prepared by the direct application of international standards ISO 4884−78, ISO 4489−78

5. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

______________
* On the territory of the Russian Federation GOST R ISO 2859−1-2007, here and hereafter. — Note the manufacturer’s database.

6. Validity extended until 01.01.96 by the Resolution of Gosstandart of the USSR from 30.10.90 N 2733

7. REPRINT (September 1992) with Amendments No. 1, 2, 3, 4, approved in October 1983, July 1985, July 1987, October 1990 (IUS 2−84, 11−85, 12−87, 1−91)


This standard establishes the rules of acceptance and methods of sampling mixtures of powders of carbide and binder metal for the carbide; powders of oxide, carbide and ceramic tool materials and products from them.

It is allowed to conduct sampling according to international standards ISO 4884−78, ISO 4489−78 given in appendices 1 and 2.

(Changed edition, Rev. N 4).

1. ACCEPTANCE RULES

1.1. Mixture of powders of carbide and binder metal for the carbide and a mixture of powders of oxide, carbide and ceramic tool materials

1.1.1. For the party taking the powder composed of the averaged mixture of powders of the same brand of carbide and binder metal, are made on one technology, designed a document about quality that contains:

trademark or the name and trademark of manufacturer;

the name and brand of powder;

batch number;

the weight of the batch;

the results of the analysis;

the date of manufacture;

the designation of normative-technical document on the powder;

stamp of technical control.

The weight of the batch shall be not less than 200 kg for hard metals and not less than 50 kg for ceramic tool materials.

1.1.2. Coercivity, density, hardness, macrostructure, microstructure, porosity, elemental carbon, tensile strength in bending, cutting properties, the chemical composition of the carbide grade and density, cutting properties and tensile strength under bending for ceramic tool materials is determined by the results of testing the average of the sample, for which the party selected sample under the table.1.

Table 1

Note. Every subsequent 100 packing units in the batch are selected one packaging unit.

1.1−1.1.2. (Changed edition, Rev. N 2).

1.1.3. If unsatisfactory test results of at least one indicator thereon, a second test, which is taken new average sample from the doubled sample taken from the same batch.

The results of repeated tests are final and apply to the entire party.

1.2. Sintered products made of hard alloys and products made of hot-pressed ceramic tool materials

1.2.1. Products adopt batches. The party should consist of products of one brand are made of an averaged mixture of powders according to one technology, and issued a document about quality that contains:

trademark or the name and trademark of manufacturer;

product name and grade;

batch number;

the weight of the batch;

the results of the tests;

the date of manufacture;

the designation of normative-technical document on the products;

stamp of technical control.

1.2.2. To check the coercive force, density, hardness, macrostructure, microstructure, porosity, free carbon, cutting and drilling properties of products of solid sintered alloys and to check the density, hardness and cutting properties of hot-pressed products of ceramic tool materials of the party selected sample in accordance with table.2.

Table 2

PCs

(Changed edition, Rev. N 2).

1.2.3, 1.2.4. (Deleted, Rev. N 3).

1.2.5. If unsatisfactory validation results at least one indicator thereon, a second test at twice the sample taken from the same batch.

The results of repeated tests are final and apply to the entire party.

1.2.6. Control of geometrical parameters, the level of control the levels of acceptance of defects for the parameters, the type of plan monitoring and classification of defects into critical, significant, minor are set by GOST 18242−72 in the normative-technical documentation for the products.

(Added, Rev. N 3).

2. METHODS OF SAMPLING AND SAMPLE PREPARATION

2.1. Mixture of powders of carbide and binder metal for the carbide and a mixture of powders of oxide, carbide and ceramic tool materials.

2.1.1. From each selected according to claim 1.1.2 of the packaging unit probe selected point of the sample, lowering it at the center of each container to the full depth.

2.1.2. Selected spot samples are combined in the combined sample, thoroughly mix and reduce to an average sample weight of not less than 200 g.

2.1−2.1.2. (Changed edition, Rev. N 2).

2.2. For physical-mechanical tests determination of macro — and microstructure from the average sample, obtained according to claim 2.1.2, prepare the samples in accordance with table.3.

Table 3

The total mass of the sample for chemical analysis shall be not less than 10 g.

For hard alloys definition of coercive force, density, cutting properties, hardness is performed on specially made plates of any tool shape that is convenient for subsequent testing; determination of tensile strength in bending is performed on shtapikah. Definition of macrostructure, microstructure, porosity and free carbon is carried out on two samples: one cutting plate and one stabile. For ceramic tool materials determination of density and hardness is carried out on the samples made to determine the cutting properties.

Fabrication of samples for testing carried out in the equipment and technological modes adopted to the products of the respective brand. The final operation in the manufacture of samples for all types of tests carried out simultaneously in one and the same container (the boat), form.

(Changed edition, Rev. N 2, 3).

2.2.1. Made from a medium sample, the samples are divided into two parts, one of which subjected to testing and the other stored in for three months in case of differences in the assessment of quality.

2.2.2. Samples should be wrapped in heavy paper and Packed in cardboard boxes according to GOST 7933−89 or in boxes and pencil cases from any organic plastic masses.

On the box label that contains:

a) mark of a hard alloy or ceramic tool material;

b) the batch number;

C) designation of the products;

g) date of sampling;

d) the number of items in a batch;

e) the stamp of technical control.

2.3. The sintered product of carbide and hot-pressed and products made of ceramic tool materials.

2.2.2, 2.3. (Changed edition, Rev. N 2).

2.3.1. For testing of products taken according to claim 1.2.2, conduct sampling in accordance with table.4.

Table 4

For products made of hard alloys definition of coercive force, density, hardness, macrostructure, microstructure, porosity, free carbon, cutting and drilling properties is carried out on the samples selected to determine the coercive force. The definition of density and hardness performed on the same samples. Definition of cutting, drilling properties, microstructure, porosity and free carbon is carried out on the samples with the smallest and largest value of the coercive force.

For the production of ceramic tool materials determine the density, hardness and cutting properties (turning). Determination of density, hardness and cutting properties is carried out on the same samples.

(Changed edition, Rev. N 1, 2, 3).

2.3.2. The selected sample is divided into two parts, one of which subjected to testing and the other stored in for three months in case of differences in the assessment of quality.

2.3.3. Samples should be wrapped in heavy paper and Packed in cardboard boxes according to GOST 7933−89 or in boxes and pencil cases from any organic plastic masses.

On carton and label containing:

a) mark of a hard alloy or ceramic tool material;

b) the batch number;

C) date of sampling;

g) the designation of the goods;

d) the number of items in a batch;

e) the stamp of technical control.

(Changed edition, Rev. N 2).

ANNEX 1 (recommended). Alloys, solid. Sampling and testing of powders for sintered samples (ISO 4884−78)

ANNEX 1
Recommended

ALLOYS, SOLID

Sampling and testing of powders for sintered samples (ISO 4884−78)

1. Purpose and scope

This standard establishes the methods of sampling, preparation of samples and testing of powder mixtures for the production of hard alloys.

2. Links

ISO 3326−75 Hard alloys. The method of determining the coercive force (magnetization).

ISO 3327−82 Hard alloys. Determination of ultimate strength in lateral bending.

ISO 3369−75 Impermeable sintered metal materials and hardmetals. The definition of density.

ISO 3738−83 Alloys, solid. Measurement of hardness by Vickers.

ISO 3954−77 Powders used in powder metallurgy. Sampling.

ISO 4499−78 Alloys, solid. Method for metallographic determination of microstructure.

ISO 4505−78 Alloys, solid. Methods of metallographic determination of porosity and content of graphite.

3. Definition

Terms and definitions — ISO 3954−77.

4. Sampling

4.1. Sampling from the batch carried out in accordance with ISO 3954−77.

4.2. In the case that the serving of powder mixed in one load in one mixer immediately before the separation of the containers, as agreed between manufacturer and consumer from the mixer can be taken one or more samples for research.

5. Preparation of samples for testing

5.1. Test specimens shall be made of tested workpieces according to their brand and size. All samples for each type of test is sintered simultaneously in the same conditions and the same furnace.

5.2. Properties of the samples made from this batch of powder, are significant only in the case if in the process of their production apply appropriate production conditions.

5.3. The sizes of the samples must comply with the requirements of relevant international standards. To determine the porosity of thin sections prepared from one or more samples so that the total survey area was at least 1 cm.

6. Test

The test is usually conducted on the sintered samples obtained from a specific batch of powder, are given in the table.

Note. The definition of the properties specified in the table can be performed on the same samples, but the hardness, microstructure and porosity should be conducted to determine the tensile strength in transverse bending.

APPENDIX 2 (recommended). Sintered hard materials. Sampling and testing (ISO 4489−78)

ANNEX 2
Recommended

SINTERED HARD MATERIALS

Sampling and testing (ISO 4489−78)

1. Purpose and scope

This international standard specifies sampling and testing of sintered hard alloys to determine their physical and mechanical properties.

2. Links

ISO 3326−75 Hard alloys. The method of determining the coercive force.

ISO 3369−75 Impermeable sintered metal materials and hardmetals. The definition of density.

ISO 3738/1−82 sintered hard Alloys. Definition of Rockwell hardness (scale A).

ISO 3878−83 Alloys, solid. Measurement of hardness by Vickers.

ISO 4499−78 Alloys, solid. Methods of metallographic determination of microstructure.

ISO 4505−78 Alloys, solid. Methods of metallographic determination of porosity and content of graphite.

3. Definition

3.1. Party — a certain number of homogeneous sintered products of the same size and quality.

3.2. Sample for testing — one or more products taken from the party to define the properties.

4. Sampling

Carbide products are supplied in a large range of sizes and quantities for wide range of applications. In addition, the determination of physical and mechanical properties requires a significant investment and sometimes associated with destruction. It is therefore undesirable and impractical to apply this amount of samples, which is usually used to control dimensional characteristics. Thus, the degree of uniformity can be determined economically in the process of production control. To confirm this quality hard alloy is usually sufficient to take one sample (one item).

5. Test methods

5.1. Test methods which are carried out on the sample given in table.1.

Table 1

5.2. Tests that can be conducted in special cases, are given in table.2.

Table 2

6. The test report

Sintered products bought in small quantities or taken from reserves. Therefore, it is impossible to keep the identity of the party, and, therefore, you cannot rely on the fact that each order can be submitted the test report.