TU 48-19-90-90

USSR MINISTRY OF METALLURGY

OKP 19 6721 7350 APPROVED: by the manufacturing organization 09.07.90 AGREED: 24.01.90 The basic organization for standardization 02.07.90

UDC 669.21.8-412 Group B-51

BLANKS FROM ALLOY GRADE VNM 3-2

Technical conditions

TU 48-19-90-90

instead of TU 48-19-74

Valid from 01/01/91 to 01/01/96

Right:

These technical conditions apply to blanks made of VNM 3-2 alloy, intended for the manufacture of inertial weights and parts of gamma-ray devices, as well as for other purposes.

The conventional designation when ordering products is drawn up taking into account the OKP.

Example: Blanks made of VNM 3-2 alloy according to TU 48-19-90-19 6721 7350.

1. TECHNICAL REQUIREMENTS

1.1. The blanks must comply with the requirements of these technical conditions.

1.2. The shape, dimensions, and maximum deviations in the dimensions of the blanks must comply with the requirements specified in the consumer's drawings, agreed upon with the manufacturer.

1.3. The blanks must be made from a mixture of grade VNM 3-2, the chemical composition of which is given in Table 1.

Table 1

Name of components	Mass fraction, %
Nickel Copper Tungsten	2.9-3.4 1.6-2.1 rest

Note: The mass fraction of components is indicated for the preparation of the mixture and control

is not subject to preparation.

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Developer.		Brain			Blanks made of alloy grade VNM 3-2 Technical conditions	Lit.			Sheet	Sheets
Checked		Kachina					A		2	13
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Approved.

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1.4. The physical and mechanical properties of the alloy must comply with the standards specified in Table 2.

Table 2

Density, g/ cm3 , not less		Rockwell hardness
products by weight up to 5 kg incl.	products by weight over 5 kg	on the "B" scale	on a scale of "C"
17.9	17.6	92-100	24-30

Note: The determination of hardness on the "C" scale is carried out in the event of obtaining results

over 100 on the "B" scale.

1.5. The porosity and amount of foreign inclusions in blanks weighing up to 300 g must not exceed the requirements specified in Table 3.

Table 3

Size of pores and foreign inclusions, µm	Number of pores and foreign inclusions on the section area, pcs/ cm2 , no more than
up to 60 incl. over 60 to 100 incl. " 100 " 200 " " 200 " 250 " over 250	not regulated 100 12 5 3

1.6. No cracks, cavities, delaminations or oxidations that compromise the integrity of the surface layer are allowed on the surface of the blanks. Surface roughness, surface layer oxidations that do not affect the integrity of the surface layer of the blanks, dents and sticking are not a rejection feature. Chipping, flaking, cleaning of surface defects that do not take the dimensions of the blanks beyond the permissible deviations are not a rejection feature.

1.7. For blanks in the form of plates and rods, the deviation from straightness of the planes of the blanks should not exceed:

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when the ratio of the length to the width of the workpiece is 2:1 or more - 2 mm;

with a length to width ratio of less than 2:1 - 1 mm.

For workpieces of other shapes, the deviation from the straightness of the workpiece planes should not exceed 1 mm.

1.8. Packaging

1.8.1. The blanks are packed in boxes according to GOST 2991-85 type I with internal dimensions of (250x155x60)+5 mm. The boxes are lined with technical cotton wool according to GOST 5679-85. The packaging of blanks in a box must exclude the possibility of their movement. It is allowed to pack blanks of different shapes and sizes for one customer in one box. The weight of a box with blanks must not exceed 20 kg.

1.8.2. A passport is placed in each box, indicating:

1) name of the manufacturer,

2) the number of these technical conditions,

3) alloy grade,

4) conventional designation of blanks,

5) date of issue,

6) the mass of the workpieces,

7) test data of blanks,

8) controller and packer number,

9) batch number.

1.9. Marking

1.9.1. No marking of blanks is performed.

1.9.2. The box is marked according to GOST 14192-77 directly on the box using paper, cardboard or plywood labels.

The marking must contain:

1) name of the manufacturer,

2) order number,

3) alloy grade,

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4) conventional designation of blanks,

5) net weight of the box,

6) batch number.

2. ACCEPTANCE RULES AND SAMPLING METHODS

2.1. The blanks are presented to the quality control department of the manufacturing enterprise in batches weighing up to 200 kg. A batch must consist of blanks of the same shape and size, made from a mixture of the same preparation according to the same technological process and simultaneously presented for acceptance according to the same document.

2.2. To conduct tests, blanks are selected from the batch in quantities specified in Table 4.

Table 4

Controlled parameters	Mass or area sections of blanks	Number of blanks (or witnesses)
Density Porosity and foreign inclusions Dimensions Hardness	up to 500 g incl. over 500 g less than 1 cm2 1 cm2 and more up to 5 kg incl. over 5 kg	(4-6) kg of blanks from each batch (20 weighings (200-300) g of blanks) 100% 1 witness 1 blank 10% 100% 5 blanks

Note: The "witness" sample is a rod measuring (8x8x36) mm, made from a mixture

one batch with the blanks and sintered together with them.

In the event of unsatisfactory results obtained during random inspection of at least one blank (or witness, or one weighing), a double number of blanks (or witnesses) is selected.

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In case of unsatisfactory results of repeated control on at least one workpiece (or "witness", or one weighing), the lot is rejected. In case of unsatisfactory results in dimensions on at least one workpiece, the lot is subject to complete rejection.

2.3. To check the blanks for compliance with the requirements of paragraphs 1.6 and 1.7, the batch is subject to complete culling.

3. TEST METHODS

3.1. The check for compliance with the requirements of paragraph 1.2 (dimensions) and paragraph 1.7 (deviation from straightness) is carried out using measuring instruments whose measurement error does not exceed the requirements of GOST 8.051-81.

3.2. Density is determined using the method described in Appendix 1.

3.3. Checking of blanks for compliance with the requirements of clause 1.4 (hardness) is carried out in accordance with GOST 9013-59.

3.4. The porosity and quantity of foreign inclusions are controlled on the blanks using the method described in Appendix 2.

3.5. Checking for compliance with the requirements of paragraph 1.6 (surface quality) is carried out visually without the use of magnifying devices.

4. TRANSPORTATION AND STORAGE

4.1. The blanks are transported in the packaging specified in clause 1.8.1.

- by road transport in accordance with the "General Rules for the Carriage of Goods by Road Transport", Moscow, "Transport", 1979;

- by rail transport in accordance with the "Rules for the carriage of goods", published by "Transport", Moscow, 1983;

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- by air transport in accordance with RGP-74 "Guide to cargo transportation on domestic air routes of the USSR", M., "Transport", 1979.

Transportation conditions in terms of exposure to climatic factors - according to storage conditions group 2 (C) GOST 15150-69.

4.2. The blanks are stored at the consumer's place in the packaging specified in clause 1.8.1 for storage group 1 (l) of GOST 15150-69 in a dry, heated room that does not contain acid or alkali vapors.

5. SUPPLIER'S WARRANTIES

5.1. The supplier company guarantees that the blanks comply with the requirements of these technical conditions, provided that the consumer complies with the conditions of use, transportation and storage established by the technical conditions.

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APPENDIX 1

Mandatory

HYDROSTATIC METHOD

determining the density of the workpiece

The method involves weighing the samples in air and then in distilled water and calculating their density.

1. EQUIPMENT AND MATERIALS

The density meter consists of two main parts:

laboratory scales GOST 24104-88E,

set of weights GOST 7328-82E,

a device for weighing workpieces in water.

The weighing device consists of a vessel with distilled water and a basket for placing the workpieces.

Distilled water GOST 6709-72.

2. CONDUCTING TESTS

The surface of the workpieces must be thoroughly cleaned when determining the density.

The vessel with water is placed on a special stand. It is necessary to ensure that the vessel and stand do not touch the scale pan. To remove air bubbles from the surface of the workpieces, they are immersed in water several times; the suspended samples should not touch the walls of the vessel.

The calculation of the density of the blanks (ρ) is carried out with an accuracy of 0.1 g/ ^cm3 using the formula:

ρ =

where: m ₄ - mass of the workpieces suspended in air, g,

m ₂ - mass of blanks suspended in water, g.

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APPENDIX 2

Mandatory

METHOD

metallographic control of porosity and foreign inclusions

This methodology establishes a method for determining porosity and foreign inclusions.

1. EQUIPMENT, MATERIALS, REAGENTS

1.1. A metallographic microscope that allows observations at 60 ^x -100 ^x .

1.2. Grinding and polishing machine providing a disk rotation speed of up to 1500 rpm.

1.3. Grinding wheels made of green silicon carbide according to GOST 2424-83.

1.4. Sanding paper on a paper backing according to GOST 10054-82.

1.5. Technical clean-fingered baize.

1.6. Potassium oxide hydrate technical according to GOST 9285-78.

1.7. Sodium hydroxide technical according to GOST 2263-79.

1.8. Potassium ferricyanide according to GOST 4206-75.

1.9. Zinc oxide according to GOST 10262-73.

1.10. Laboratory filter paper according to GOST 12026-76.

1.11. Water.

Note: It is permitted to use pure reagents, pure for analysis, chemically

clean.

2. PREPARATION FOR THE TEST

2.1. A sample of arbitrary shape for research (0.5-2.0) ^cm2 is made from a blank or witness.

2.2. The sample is sharpened on grinding wheels made of green silicon carbide.

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2.3. After sharpening, the sample is ground on a grinding and polishing machine using waterproof sandpaper with gradually decreasing grain size, starting with No. 16-10 and ending with No. 40-28.

The grinding operation on each skin is carried out until the traces of the previous operation disappear.

2.4. Prepare a suspension of the following composition:

Potassium ferricyanide - (40-5-) g.

Potassium hydroxide 20% or sodium hydroxide 20% - (15-20) cm ³ .

Zinc oxide - (40-50) g.

Tap water - 1000 ^m3 .

2.5. The sample is polished with the suspension prepared according to paragraph 2.4 on a flannel-covered disk.

2.6. Quality control of polishing is carried out by examining the section under a microscope at a magnification of 60 ^x -100 ^x .

The surface of the grind should be mirror-like and free of marks and scratches.

Note: It is permissible to prepare the section in another way that ensures its

quality.

3. CONDUCTING THE TEST

3.1. By preliminary viewing under a microscope, select a section of the section with the maximum number of pores.

3.2. Mark a section of size (1x1) cm or two sections of size (1.0x0.5) cm depending on the shape and size of the sample.

3.3. Place the sample on the microscope stage and view the entire area of the marked section at a magnification of 60 ^x -100 ^x by moving the stage.

3.4. Using a linear eyepiece micrometer (1:100), measure all pores of 61 µm or larger in size and calculate their number on a section area of 1 ^cm2 .

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3.5. The number of pores is calculated by classes:

1 class - 61-100 microns

Class 2 - 101-200 microns

Class 3 - 201-250 microns

Class 4 - more than 250 microns.

4. PROCESSING RESULTS

4.1. The number of pores per 1 ^cm2 of the section area is estimated for each sample.

4.2. The test results are recorded in accordance with the attached form.

Results of metallographic testing

Batch No.	Section No.	Alloy brand	Product shape	Number of pores of 61 µm or more per 1 cm2 of section area				Note
				61-100 microns	101-200 microns	201-250 microns	over 250 microns

Date Performer Head of CZL

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APPENDIX 3

Reference

SCROLL

documents referenced in the technical specifications

GOST 8.051-81 GOST 166-80 GOST 427-75 GOST 2263-79 GOST 2424-83 GOST 2991-85 GOST 4206-75 GOST 5679-85 GOST 7328-82E GOST 6709-72 GOST 9013-59 GOST 9285-78 GOST 10054-82 GOST 10262-73 GOST 12026-76

GSP. Errors allowed in measuring linear dimensions up to 500 mm. Calipers. Technical conditions. Measuring metal rulers. Technical conditions. Sodium hydroxide technical. Technical conditions. Grinding wheels. Technical conditions. Non-collapsible wooden boxes for cargo weighing up to 500 kg. General specifications. Potassium ferrocyanide. Cotton wool for clothing and furniture. Technical conditions. General-purpose and standard mass measures. Technical conditions. Distilled water. Metals and alloys. Rockwell hardness test method. Scales A, B, C. Potassium hydroxide technical. Technical conditions. Sanding paper. Technical conditions. Zinc oxide. Technical conditions. Laboratory filter paper. Technical conditions.

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GOST 14192-77 GOST 15150-69 TU 2-03-225-87			Cargo marking. Machines, devices and other technical products. Design for different climatic regions. Categories, conditions of operation, storage and transportation in terms of exposure to climatic factors of the external environment. Technical conditions. Probes.

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PRODUCT CATALOGUE SHEET

304627/0/

CSM code

01

200

Group KGS (OKS)

02

At 51

Registration number

03

022369/01

OKP code			11
Product name			12
Product designation			13
Designation of a normative or technical document (instead)			14	TU 48-19-90-90 amend. 1
Name of the normative or technical document			15
Manufacturer's code according to OKPO			16
Name of the manufacturer			17
Address of the manufacturer (index; city; street; house)			18
Telephone	19			Telefax	20
Telex	21			Teletype	22
Name of the holder of the original			23
Address of the holder of the original (index; city; street; house)			24
Production start date			25
Date of entry into force of a regulatory or technical document			26	until 01.01.2001
Certificate of Conformity number			27

PRODUCT CHARACTERISTICS

1. Extension of validity.

2. Replacing links.

		Surname	Signature	Date	Telephone
Presented	04	Lavrukhina		31.07.95	113 54 90
Registered	05			10.08.95	432 26 33
Added to the catalog	06