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TU 48-19-60-78

TU 48−19−60−78

Tungsten, titanium-tungsten and titanium-tantalum-tungsten mixtures.

Specifications *


These technical conditions apply to mixtures of tungsten, titanium-tungsten and titanium-tantalum-tungsten for the manufacture of carbide products.

1. Technical requirements

1.1. The content of the main components in the mixture of powders and the physical and mechanical properties of sintered control samples prepared from the mixtures must comply with the requirements of GOST 3882−74 or specified in table. 1.

Table 1

Mix brand Content of main components in a mixture of powders,% Physical and mechanical properties
Wolfram carbide vanadium carbide chromium carbide tantalum carbide cobalt Bending strength, kgf / mm2, not less Density, g / cm3 Hardness NRA, not less
VK15-M 85 - - - fifteen 155 13.8−14.1 87.0
VK20-M 80 - - - 20 175 13.3−13.7 85.0
VK15−0M 82.9 0.1 - 2 fifteen 150 13.8−14.3 87.0
VK10-X0M 89.2 - 0.8 - ten 150 n.m. 14.3 89.0
VK15-X0M 84.2 - 0.8 - fifteen 165 n.m. 13.8 87.5


1.2. By agreement of the parties, mixtures can be supplied with the determination of the content of cobalt, carbon, (free and total), oxygen, iron. The norms for the content of these components and impurities must comply with TU 48−1U-10.4−73 or given in table. 2

table 2

Mix brand Content of components and impurities,%
Cobalt Total carbon no more
Free carbon Oxygen Iron
VK3 2.8−3.3 5.65−5.8 0.1 0,4 0.3
VK20 19.5−20.5 4.7−4.95 0.1 0.5 0.3
VK25 24.5−25.5 4.5−4.75 0.1 0.5 0.3
VK3-M 2.8−3.2 5.7−5.95 0.1 0.6 0.3
VK6−0M 5.8−6.2 5.7−6.0 0.25 0.9 0.3
VK10-M 9.5−10.5 5.3−5.5 0.08 1.0 0.3
VK15-M 14.2−15.5 5.0−5.2 0.08 1,2 0.3
VK10-X0M 9.5−10.5 n.m. 5.40 0.25 0.8 0.5
VK20-M 19.0−20.5 4.7−4.9 0.08 1.5 0.3
VK15-X0M 14.2−15.5 n.m. 5.10 0.25 1.0 0.5
VK10−0M 9.5−10.5 5.4−5.7 0.25 1.0 0.3
VK15−0M 14.2−15.5 n.m. 5.10 0.25 1.0 0.8


1.3. The physical and mechanical properties of control samples prepared from mixtures of brands certified by the State Quality Mark must comply with the requirements specified in table. 3.

Table 3

Mix brand Physical and mechanical properties
Bending strength, kgf / mm2, not less Density, g / cm3 Hardness HRA, not less
VK6 150 14.8−15.0 88.7
VK8 165 14.6−14.8 88.0
VK15 180 13.9−14.1 86.0
VK20 195 13.4−13.7 84.0
T5K10 150 12.5−13.1 88.7
T14K8 130 11.2−11.6 89.7
T15K6 120 11.2−11.6 90.3
T30K4 95 9.5−9.8 92.0


1.4. Control samples made from mixtures, when tested for cutting, must have resistance standards corresponding to OST 48−99−76.

Resistance standards for mixtures of brands certified by the State Quality Mark must not be lower:

I. mixture VK4 — 1.2

II. mixture VK6 — 1.2

III. mixture VK8 — 1.2

IV. mixture T5K10 — 1.6

V. T14K8 mixture — 1.35

Vi. mixture TI5K6 — 1.6

Vii. mixture T30K4 — 1.10