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GOST 30642-99

GOST R ISO 15353-2014 GOST P 55080-2012 GOST R ISO 16962-2012 GOST R ISO 10153-2011 GOST R ISO 10280-2010 GOST R ISO 4940-2010 GOST R ISO 4943-2010 GOST R ISO 14284-2009 GOST R ISO 9686-2009 GOST R ISO 13899-2-2009 GOST 18895-97 GOST 12361-2002 GOST 12359-99 GOST 12358-2002 GOST 12351-2003 GOST 12345-2001 GOST 12344-88 GOST 12350-78 GOST 12354-81 GOST 12346-78 GOST 12353-78 GOST 12348-78 GOST 12363-79 GOST 12360-82 GOST 17051-82 GOST 12349-83 GOST 12357-84 GOST 12365-84 GOST 12364-84 STATE STANDARD P 51576-2000 GOST 29117-91 GOST 12347-77 GOST 12355-78 GOST 12362-79 GOST 12352-81 GOST P 50424-92 STATE STANDARD P 51056-97 GOST P 51927-2002 GOST P 51928-2002 GOST 12356-81 GOST R ISO 13898-1-2006 GOST R ISO 13898-3-2007 GOST R ISO 13898-4-2007 GOST R ISO 13898-2-2006 STATE STANDARD P 52521-2006 GOST P 52519-2006 GOST R 52520-2006 GOST P 52518-2006 GOST 1429.14-2004 GOST 24903-81 GOST 22662-77 GOST 6012-2011 GOST 25283-93 GOST 18318-94 GOST 29006-91 GOST 16412.4-91 GOST 16412.7-91 GOST 25280-90 GOST 2171-90 GOST 23401-90 GOST 30642-99 GOST 25698-98 GOST 30550-98 GOST 18898-89 GOST 26849-86 GOST 26876-86 GOST 26239.5-84 GOST 26239.7-84 GOST 26239.3-84 GOST 25599.4-83 GOST 12226-80 GOST 23402-78 GOST 1429.9-77 GOST 1429.3-77 GOST 1429.5-77 GOST 19014.3-73 GOST 19014.1-73 GOST 17235-71 GOST 16412.5-91 GOST 29012-91 GOST 26528-98 GOST 18897-98 GOST 26529-85 GOST 26614-85 GOST 26239.2-84 GOST 26239.0-84 GOST 26239.8-84 GOST 25947-83 GOST 25599.3-83 GOST 22864-83 GOST 25599.1-83 GOST 25849-83 GOST 25281-82 GOST 22397-77 GOST 1429.11-77 GOST 1429.1-77 GOST 1429.13-77 GOST 1429.7-77 GOST 1429.0-77 GOST 20018-74 GOST 18317-94 STATE STANDARD P 52950-2008 GOST P 52951-2008 GOST 32597-2013 GOST P 56307-2014 GOST 33731-2016 GOST 3845-2017 STATE STANDARD P ISO 17640-2016 GOST 33368-2015 GOST 10692-2015 GOST P 55934-2013 GOST P 55435-2013 STATE STANDARD P 54907-2012 GOST 3845-75 GOST 11706-78 GOST 12501-67 GOST 8695-75 GOST 17410-78 GOST 19040-81 GOST 27450-87 GOST 28800-90 GOST 3728-78 GOST 30432-96 GOST 8694-75 GOST R ISO 10543-99 GOST R ISO 10124-99 GOST R ISO 10332-99 GOST 10692-80 GOST R ISO 17637-2014 GOST P 56143-2014 GOST R ISO 16918-1-2013 GOST R ISO 14250-2013 GOST P 55724-2013 GOST R ISO 22826-2012 GOST P 55143-2012 GOST P 55142-2012 GOST R ISO 17642-2-2012 GOST R ISO 17641-2-2012 GOST P 54566-2011 GOST 26877-2008 GOST R ISO 17641-1-2011 GOST R ISO 9016-2011 GOST R ISO 17642-1-2011 STATE STANDARD P 54790-2011 GOST P 54569-2011 GOST P 54570-2011 STATE STANDARD P 54153-2010 GOST R ISO 5178-2010 GOST R ISO 15792-2-2010 GOST R ISO 15792-3-2010 GOST P 53845-2010 GOST R ISO 4967-2009 GOST 6032-89 GOST 6032-2003 GOST 7566-94 GOST 27809-95 GOST 22974.9-96 GOST 22974.8-96 GOST 22974.7-96 GOST 22974.6-96 GOST 22974.5-96 GOST 22974.4-96 GOST 22974.3-96 GOST 22974.2-96 GOST 22974.1-96 GOST 22974.13-96 GOST 22974.12-96 GOST 22974.11-96 GOST 22974.10-96 GOST 22974.0-96 GOST 21639.9-93 GOST 21639.8-93 GOST 21639.7-93 GOST 21639.6-93 GOST 21639.5-93 GOST 21639.4-93 GOST 21639.3-93 GOST 21639.2-93 GOST 21639.0-93 GOST 12502-67 GOST 11878-66 GOST 1763-68 GOST 13585-68 GOST 16971-71 GOST 21639.10-76 GOST 2604.1-77 GOST 11930.7-79 GOST 23870-79 GOST 11930.12-79 GOST 24167-80 GOST 25536-82 GOST 22536.2-87 GOST 22536.11-87 GOST 22536.6-88 GOST 22536.10-88 GOST 17745-90 GOST 26877-91 GOST 8233-56 GOST 1778-70 GOST 10243-75 GOST 20487-75 GOST 12503-75 GOST 21548-76 GOST 21639.11-76 GOST 2604.8-77 GOST 23055-78 GOST 23046-78 GOST 11930.11-79 GOST 11930.1-79 GOST 11930.10-79 GOST 24715-81 GOST 5639-82 GOST 25225-82 GOST 2604.11-85 GOST 2604.4-87 GOST 22536.5-87 GOST 22536.7-88 GOST 6130-71 GOST 23240-78 GOST 3242-79 GOST 11930.3-79 GOST 11930.5-79 GOST 11930.9-79 GOST 11930.2-79 GOST 11930.0-79 GOST 23904-79 GOST 11930.6-79 GOST 7565-81 GOST 7122-81 GOST 2604.3-83 GOST 2604.5-84 GOST 26389-84 GOST 2604.7-84 GOST 28830-90 GOST 21639.1-90 GOST 5640-68 GOST 5657-69 GOST 20485-75 GOST 21549-76 GOST 21547-76 GOST 2604.6-77 GOST 22838-77 GOST 2604.10-77 GOST 11930.4-79 GOST 11930.8-79 GOST 2604.9-83 GOST 26388-84 GOST 14782-86 GOST 2604.2-86 GOST 21639.12-87 GOST 22536.8-87 GOST 22536.0-87 GOST 22536.3-88 GOST 22536.12-88 GOST 22536.9-88 GOST 22536.14-88 GOST 22536.4-88 GOST 22974.14-90 GOST 23338-91 GOST 2604.13-82 GOST 2604.14-82 GOST 22536.1-88 GOST 28277-89 GOST 16773-2003 GOST 7512-82 GOST 6996-66 GOST 12635-67 GOST 12637-67 GOST 12636-67 GOST 24648-90

GOST 30642−99 (ISO 7625−83) Materials powder (sintered metal), excluding hardmetals. Sample preparation for chemical analysis for determination of carbon

GOST 30642−99
(ISO 7625−83)

Group B59


INTERSTATE STANDARD


MATERIALS POWDER (SINTERED METAL),
EXCLUDING HARD ALLOYS

Sample preparation for chemical analysis for determination of carbon


Sintered metal materials, excluding hardmetals.
Preparation of samples for chemical analysis for determination of carbon content



ISS 77.160
AXTU 1790

Date of introduction 2001−07−01



Preface

1 DEVELOPED by the Interstate technical Committee for standardization MTK 150, Institute for problems of materials science I. N. Frantsevich of NAS of Ukraine

SUBMITTED to the State Committee of Ukraine for standardization, Metrology and certification

2 ADOPTED by the Interstate Council for standardization, Metrology and certification (minutes N 15 of 28 may 1999)

The adoption voted:

   
The name of the state The name of the national authority for standardization
The Republic Of Belarus
Gosstandart Of The Republic Of Belarus
The Republic Of Kazakhstan
Gosstandart Of The Republic Of Kazakhstan
The Kyrgyz Republic
Kyrgyzstandard
The Republic Of Moldova
Moldovastandart
Russian Federation
Gosstandart Of Russia
The Republic Of Tajikistan
Tajikistandart
Turkmenistan
Glavgosekspertiza «Turkmenstandartlary»
The Republic Of Uzbekistan
Standards
Ukraine
Gosstandart Of Ukraine

3 this standard contains the full authentic text of international standard ISO 7625−83 «sintered metal Materials, excluding hardmetals. Sample preparation for chemical analysis for determination of carbon» with additional requirements that reflect the needs of the economy, which in the text are highlighted in italics

4 Resolution of the State Committee of the Russian Federation for standardization and Metrology dated December 19, 2000 N 384-St inter-state standard GOST 30642−99 (ISO 7625−83) introduced directly as a state standard of the Russian Federation from July 1, 2001

5 INTRODUCED FOR THE FIRST TIME

Introduction


Chemical analysis of sintered metal (powder according to GOST 17359) materials, excluding hard metals, is performed using available standard methods for compact metals (molten metals and their alloys).

As sintered materials very frequently contain carbon in different conditions, the correct determination of the mass fraction of free or total carbon requires the observance of certain precautions in the preparation of samples for analysis of their composition.

Samples prepared in accordance with the requirements of this standard are also suitable for chemical analysis for determination of other elements.

1 Scope


This standard specifies the methods of preparation of samples of material (products) in the form of chips or powder to determine the concentration of free or total carbon.

Fixed carbon is determined as the difference between total and free carbon. The standard provides for sample preparation for the determination of carbon by chemical method, i.e. burning them in oxygen with the subsequent determination of the resulting carbon dioxide.

Sample preparation for the determination of carbon by physical methods (metallography or spectroscopy) standard does not provide.

The standard covers products made of materials with a homogeneous distribution of carbon stored in the condition shown in table 1, and satisfies the conditions of determination given in table 2.


Table 1 — carbon As determined by chemical analysis

     
The state of carbon A typical material containing carbon
The explanation of the peculiarities of the determination of carbon
Bound carbon (carbides or solid solutions)
Carbon steel and heat resisting alloys
Is defined as the difference between total and free carbon
Free carbon
Graphite-containing bronze, steel; materials impregnated with a carbonaceous liquid (grease)
Is determined by burning the residue after selective dissolution of the metal sample (samples)
Total carbon (the sum of bound and free carbon)
All materials (products) containing carbon Determined by direct combustion of the sample (samples)



Table 2 — Sources of carbonaceous substances and the possibility of determination of carbon by chemical methods

     
Carbonaceous matter A source of carbonaceous substances
The conditions for the determination of carbon
1 liquid or semi-Liquid organic substance on the surface or in the pores
Calibration grease, quenching oil, impregnating the lubricant are soluble, grease Determination of carbon is possible only after complete removal of organic substances using the method given in section 4
2 Paraffin or paravenously substances
A calibration lubricant, corrosion protection
The same
3 Surface deposits of carbon
Sintering, heat treatment
«
4 Solid organic substances such as plastic on the surface or in the pores The sealing material ensures tightness or corrosion protection products
Basically, the removal of these substances and the determination of carbon impossible



The standard does not apply to products with non-uniform distribution of carbon throughout the volume (e.g. in products with a hardened surface layer).

The presence of carbonaceous substances in the pores or on the surface of the analyzed products (table 2) interferes with the determination of carbon.

2 Normative references


The present standard features references to the following standards:

GOST 17359−82 Powder metallurgy. Terms and definitions

GOST 18898−89 (ISO 2738−87) powder Products. Methods of determination of density, oil content and porosity

GOST 24903−81 Powder products. Method for determination of oil

3 the essence of the method


Sample preparation for analysis is carried out by removing from the sample material impregnated in the pores or surface of the carbon with subsequent mechanical crushing of samples that exclude (needs to follow) losses contained in the material free of carbon.

4 Procedure sample preparation

4.1 a Sample selected based on regulatory documents for a specific material (product), and prepared in accordance with the requirements of 4.2 and 4.3.

4.2 Removal of carbon substances that prevent analysis

Carbonaceous matter (table 2), distorting the results of determination of carbon, should be removed from the sample or item to the analysis in the following way.

4.2.1 Organic substance impregnated in the pores or on the surface of the sample or product (table 2, items 1, 2), should be removed by degreasing Soxhlet at 18898 GOST or GOST 24903 using an appropriate solvent.

Note — If the liquid for impregnation contains tiny carbon particles, for example colloidal graphite, degreasing Soxhlet can be removed only part of these particles. In this case, the determination of free and total carbon will be invalid, despite the fact that the calculation of fixed carbon in this case is possible under condition of determination of the content of free and total carbon for the same product or products after degreasing.

4.2.2 Superficial deposits of carbon on the sample or product (table 2, item 3) remove mechanical treatment.

4.3 Final sample preparation

The analyzed sample should consist of small pieces or be in the form of powder with particle size that conforms to the applicable method of analysis and must be obtained in one of the following ways:

— grinding in a mortar made of a material that does not alter the composition of a sample;

— drilling, milling or grinding.

The specified mechanical processing must be performed without cooling the sample fluid. Measures must be taken against overheating, oxidation and contamination particles. If drilling is used, the product must be drilled through, and the distribution of drilled holes should be uniform across the surface of the product. The product is thick holes drilled from two sides to the middle.

If the pieces after the grinding or machining may contain small particles, such as free graphite, it is necessary to take precautions to avoid losing them during processing.

Note — In the case of all bundles received in the form of small pieces or powder sample should be after careful averaging is divided into the appropriate (necessary) number of analyzed batches. The carbon content is calculated as the average of the results of the analysis of each sample.


Prepared a number of samples should be representative of the product or products. To protect against contamination of samples for analysis should be stored in a desiccator with a tightly fitting lid without lubricant.

Requirements for long-term storage of samples should be specified in regulatory documents for specific product.

On each Packed sample should be specified:

— product name and grade of the material;

— the batch number;

— basic techniques of sample preparation with reference to this standard;

— date of preparation of the sample.