GOST 4411-79
GOST 4411−79 hardmetal Products for mining tools. Specifications (with Amendments No. 1, 2)
GOST 4411−79
Group 56
STATE STANDARD OF THE USSR
HARDMETAL PRODUCTS FOR MINING TOOLS
Specifications
Hardmetal products for mining tools.
Technical requirements
OKP 19 6500
Date of introduction 1981−01−01
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of nonferrous metallurgy of the USSR
DEVELOPERS
G. V. Lindo, A. A. Zaluzhny, V. D. Chebotaev, B. A. Peskov, V. G. Fedoseyev
2. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee on standards of December 6, 1979 N 4706
3. REPLACE GOST 4411−67
4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS
| The designation of the reference document referenced |
The item number, app |
| GOST 880−75 |
1.2, 1.3, 2.1, 4.4, App |
| GOST 2991−85 |
4.3 |
| GOST 3560−73 |
4.2 |
| GOST 3882−74 |
1.1, 4.4 |
| GOST 5679−91 |
4.2 |
| GOST 5959−80 |
4.2 |
| GOST 6086−75 |
App |
| GOST 7933−89 |
4.2 |
| GOST 9391−80 |
3.7 |
| GOST 10949−75 |
App |
| GOST 14192−96 |
4.5 |
| GOST 15846−79 |
4.2 |
| GOST 17196−77 |
App |
| GOST 18242−72 |
2.4 |
| GOST 20017−74 |
3.2 |
| GOST 20018−74 |
3.1 |
| GOST 20019−74 |
3.3 |
| GOST 20559−75 |
2.3, Annex |
| GOST 25599.1−83 — GOST 25599.4−83 |
3.10 |
5. Limitation of actions taken by Protocol No. 5−94 of the Interstate Council for standardization, Metrology and certification (ICS 11−12−94)
6. REVISED (June 1998) with Amendments No. 1, 2 approved in July 1985, August 1987 (IUS 10−85, 12−87)
1. TECHNICAL REQUIREMENTS
1.1. In accordance with the requirements of the present standard products made from hard alloys of VK4, VK6, VK6, VK8, VK8, VK8-VK, ВК11, ВК11-VK, ВК15 according to GOST 3882.
1.2. Form and dimensions must conform to the requirements of GOST 880.
1.3. The size of the fractures on the working edges (see drawing) of products according to GOST 880 must not exceed 0,2 mm.
The size of the fractures on the working edges of products according to GOST 880 should not exceed 0.5 mm.
On the rounded edge of 0.5… 1 chipping are not permitted.
(Changed edition, Rev. N 2).
1.4. Convexity and concavity to be soldering surface forms G11, G12, G13, Г14, Г23, Г25, Г26, Г40, Г4101, Г4102, Г4103, G51, Г53, Г54, Г55, Г57, Г63, Г65, Г66, Г67 should not exceed 0.1 mm.
Convexity and concavity to be soldering surface forms Г4104, Г4105, Г4106, Г60 must not exceed 0,2 mm.
Convexity and concavity on products with technology projections is not normalized.
(Changed edition, Rev. N 1).
1.5. The surface must be clean, without cracks and blisters.
1.6. The macrostructure of the products must be homogeneous, without foreign inclusions and rosslea.
1.7. The microstructure of products should conform to the standards specified in the table.
| Mark hard alloy |
The degree of porosity, %, not more | Mass fraction of graphite, %, not more | Phase WC | |||
| The principal amount of the bean |
Large grains | |||||
| Size, microns |
Number, %, not less |
Size, microns |
Number, %, not more | |||
| VK6 |
0,2 |
0,2 |
1−2 |
50 |
6−20 |
10 |
| VK8 |
||||||
| ВК15 |
0,5 |
|||||
| VK4- |
0,4 |
0,4 |
2−5 |
60 |
30 | |
| VK6- |
||||||
| VK8- |
0,2 |
|||||
| VK8-VK |
0,2 |
70 |
6−15 |
15 | ||
| ВК11-VK |
||||||
| ВК11- |
0,4 |
60 |
6−20 |
30 | ||
Notes:
1. Not allowed the pores larger than 100 µm.
2. Not allowed the presence in the structure of the inclusions of phase (double tungsten carbide and cobalt).
3. Not allowed the presence of individual large grains of tungsten carbide with a size of more than 20 µm in the alloys VK6, VK8, ВК15 and larger than 50 µm in the alloys of VK4, VK6, VK8, VK8-VK, ВК11, ВК11-VK.
2. ACCEPTANCE RULES
2.1. Products apply to the acceptance of the parties. For the party taking any number of products, hard alloy formulator one, same brand, made from the averaged mixture of powders of carbide and binder metal in one technological process, simultaneously, the requirements for acceptance furnished by a single document about quality that contains:
trademark or name of the manufacturer;
grade and product designation according to GOST 880;
batch number;
the results of the tests;
the weight of the batch;
the date of issue;
stamp of technical control;
the designation of this standard.
2.2. Products for compliance with the requirements of section 1.5 is subjected to continuous control.
2.3. Acceptance inspection of products for compliance with the requirements of PP.1.1, 1.6, 1.7 in GOST 20559.
Allowed the manufacturer to inspection for compliance with the PP.1.1, 1.6, 1.7 conduct from the products of one brand are made of an averaged mixture of powders of carbide and binder metal one technology at the same time presented for acceptance.
Check the chemical composition of the products of the manufacturer is carried out on the mixtures according to GOST 20559.
2.4. Acceptance inspection of products for compliance with the requirements of PP.1.2, 1.3, 1.4 GOST 18242*. Level of control II. The acceptance level of defects is established:
______________
* On the territory of the Russian Federation GOST R ISO 2859−1-2007. — Note the manufacturer’s database.
major defects is 2.5%;
minor defects — 4,0%;
critical defects are not allowed.
Critical defects are defects specified in paragraph 1 hereof.5.
Under considerable defects refers to the presence of fractures according to claim 1.3 and the convexity and concavity that exceed the requirements of claim 1.4. To minor defects are defects associated with violation of requirements specified in p.1.2.
2.5. The batch is accepted if the number of defective items in the sample is less than or equal to the acceptance number.
The batch is rejected if the number of defective items in the sample more than the acceptance number.
Allowed the manufacturer upon receipt of unsatisfactory results to conduct a routine inspection.
Sec. 2. (Changed edition, Rev. N 2).
3. TEST METHODS
3.1. Density determination of products — according to GOST 20018.
3.2. Hardness — GOST 20017.
3.3. Determination of tensile strength — according to GOST 20019.
3.4. Size, concavity and convexity products test and measuring instrument or device, ensuring the necessary measurement accuracy.
3.5. The dimensions of the fracture toughness according to claim 1.3 define an optical instrument with a scale interval of 0.1 mm.
(Changed edition, Rev. N 2).
3.6. The macrostructure of the products in the bend test at 20−30 x magnification.
3.7. The microstructure of the products is checked according to GOST 9391.
3.8. The inspection of the surface is carried out without the use of magnifying devices.
3.9. Alloy grades VK8, ВК11, ВК15 in the manufacture of products forms G11, G12, G13, Г14 experience drilling according to the method described in the application.
(Changed edition, Rev. N 1).
3.10. Determination of the chemical composition of the mixtures according to GOST 25599.1 — GOST 25599.4.
(Added, Rev. N 2).
4. MARKING, PACKAGING, TRANSPORTATION AND STORAGE
4.1. The marking of products is not carried out.
4.2. Products of the same shape, size and carbide grade should be wrapped in heavy paper and stowed in boxes made of cardboard according to GOST 7933, not more than 2 kg in each.
May be Packed in boxes made of polyethylene or other plastic materials.
By agreement with consumer it is permitted to pack items in bins of type 1 according to GOST 5959. The drawers are lined with wool inside technical GOST 5679. Packing products in boxes needs to be moved. Drawers should be lined with steel tape according to GOST 3560. Weight box net must be no more than 10 kg.
Packaging products are designed for areas far North and remote areas shall be in accordance with the requirements of GOST 15846*.
______________
* On the territory of the Russian Federation GOST 15846−2002. — Note the manufacturer’s database.
(Changed edition, Rev. N 1).
4.3. The box with the products to be tightly Packed in wooden boxes, type 1 or 2 according to GOST 2991. The gross weight of the box should be no more than 50 kg.
4.4. On each box or drawer must be specified:
trademark or the name and trademark of manufacturer;
grade according to GOST 3882;
designation of products according to GOST 880;
the number of items and their weight;
the designation of this standard.
4.5. Transport marking under GOST 14192 with the application of manipulation signs «Fragile. Care», «Protect from moisture».
4.6. Transportation is carried out by all types of transport in covered vehicles in accordance with the rules of cargo transportation applicable to transportation of this species. Rail transport transportation of goods carried in covered wagons or carload small shipments.
4.5, 4.6. (Changed edition, Rev. N 1).
4.7. The products are stored in original packaging in an indoor heated environment in the conditions excluding mechanical damage and contact with moisture and active chemical substances.
APP (mandatory). METHOD OF DETERMINING THE DRILLING PROPERTIES OF TUNGSTEN CARBIDE PRODUCTS FOR MINING TOOLS HAMMER DRILLING
APP
Mandatory
The method consists in drilling on blocks rocks PA special stand using a rotary. The results of tests under evaluation the operational durability solid alloy.
1. SAMPLING
Sampling is carried out according to GOST 20559.
2. EQUIPMENT, TOOLS AND MEASURING INSTRUMENTS
2.1. Carbide product form Г1106 according to GOST 880, sealed in the casing perforator crowns tolocate form according to GOST 17196. Soldering crowns is carried out in accordance with the requirements of GOST 6086. The test is carried out with a rotary hammer with an impact energy not less than 80 N/m (8 kgf/m) at compressed air pressure of 600 kN/m(6 kgf/cm
).
Fluctuations in air pressure during the test shall not exceed ±20 kN/m(0.2 kgf/cm
). The total length of air line (including the length of the hose) from the pressure gauge to the punch should not exceed 20 m Air line from the gauge to the punch should have no more than two coupling fittings with internal diameter not less than 16 mm. Diameter air hose shall be not less than 19 mm.
2.2. Drilling rods with a length of 0,8−1,0 m hexagonal inscribed circle diameter of 25±0.1 mm or round with a diameter of 32±0.1 mm and size of the cone according to GOST 10949.
The drilling is performed on homogeneous rock without fracture and violations. For these purposes use the units Shokshinsky quartzite or granite weighing not less than 1 ton
3. TESTING
3.1. The test is performed on a special stand, providing a stable testing conditions, drilling of bore-holes located vertically or horizontally, with effective cleaning of the hole from the drilling detail with the aid of dust extraction or water wash.
Before the test, prepare crowns.
Carbide blade crowns to sharpen with a radius of 120 mm and an apex angle of 110 °and diameter of 40±1 mm After sharpening on the blade of the crown is blunt and on the peripheral corners of the plate are removed chamfer. For all grades of alloys, the width of the break should be equal to 0,5±0,2 mm.
The chamfer on the peripheral corners of the plate are located at an angle of 45° to the axis of the crown and length in the plane of the blade is equal to 1−1,5 mm.
Every crown must be drilled 400 mm on the Shokshinsky quartzite or 800 mm over granite.
4. EVALUATION OF TEST RESULTS
4.1. From each batch of hard-alloy carbide three test records.
The tests evaluate the strength factor.
4.2. When testing carbide plates should not have breakdowns. All kinds of destruction of the plates, not allowing their further use, for example, transverse or longitudinal fracture, a complete or partial cleavage of the blade and russley products, is considered a failure.
4.3. Chipping is allowed no more than one plate. Under minor chipping refers to chips in which the diameter of the perforation of the crown after regrinding is reduced by no more than 1.5 mm, and a height of not more than 2 mm. Crown, with chipping carbide inserts, pritachivajut and re-test. In case of breakage of the plate during repeated drilling spalling refers to the breakdown.
4.4. If unsatisfactory results when tested by drilling (the breakage of the plates or chipping of the two plates) conducted a second test.
The results of repeated tests apply to the entire party.
If the breakage of the products will occur for reasons that do not depend on the quality of the alloy (breaking of casing or rod, jamming crowns, etc.), then this crown is not taken into account and instead tested a different.
If unsatisfactory test results, the batch is assessed as «useless strength» and is rejected. Subject to satisfactory test results, the batch is assessed as «usable strength».
