BS-5600-3.3-1987 ISO-7625-1983.pdf
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1、BRITISH STANDARD BS 5600-3.3: 1987 ISO 7625:1983 Powder metallurgical materials and products Part 3: Methods of testing sintered metal materials and products, excluding hardmetals Section 3.3 Preparation of samples for chemical analysis for determination of carbon content ISO title: Sintered metal m
2、aterials, excluding hardmetals Preparation of samples for chemical analysis for determination of carbon content UDC 621.762.8:543.05:546.26 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:57:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5600-3.3:1987 This British Standard, having been p
3、repared under the direction of the Iron and Steel Standards Committee, was published under the authority of the Board of BSI and comes into effect on 30 June 1987 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference ISM/65 Draft for comment 82/79825 DC IS
4、BN 0 580 15976 0 National foreword This Section of BS 5600 has been prepared under the direction of the Iron and Steel Standards Committee. It is identical with ISO 7625:1983 “Sintered metal materials, excluding hardmetals Preparation of samples for chemical analysis for determination of carbon cont
5、ent” published by the International Organization for Standardization (ISO). Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those
6、 used in British Standards; attention is drawn especially to the following. Wherever the words “International Standard” appear, referring to this standard, they should be read as “Section of BS 5600”. ISO 2738 is still at the draft stage, although publication is expected shortly and an identical Bri
7、tish Standard will then be published as BS 5600-3.2. Additional information. This Section is one of a series of Sections and Subsections that comprise BS 5600. The contents of BS 5600 are given in Section 1.1. Section 1.2 is a glossary of technical terms that have particular application in the powde
8、r metallurgical industry and which are used in the Sections and Subsections of this British Standard. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standar
9、d does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporat
10、ed. This will be indicated in the amendment table on the inside front cover. Cross-reference International StandardCorresponding British Standard ISO 437:1982BS 6200 Sampling and analysis of iron, steel and other ferrous metals Section 3.8 Determination of carbon Subsection 3.8.1:1985 Steel, cast ir
11、on and ferrochromium: gravimetric method (Identical) Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:57:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5600-3.3:1987 BSI 12-1999i Contents Page National forewordInside front
12、cover 0Introduction1 1Scope1 2Field of application1 3References2 4Principle2 5Procedure2 Table 1 Forms of carbon that can be determined by chemical analysis1 Table 2 Origins of carbonaceous material and feasibility of carbon determination by chemical methods1 Publications referred toInside back cove
13、r Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:57:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:57:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5600-3.3:1987 BSI 12-19991 0 Introduction The chemical analysis of sinte
14、red metal materials, excluding hardmetals, is carried out as it would be for solid metals, by using existing standard methods. However, as these sintered materials very often contain carbonaceous constituents, the correct determination of carbon content (free or total) requires that certain precauti
15、ons be taken when preparing the sample for analysis from components. Samples prepared in accordance with this International Standard may also be suitable for chemical analysis for other elements. 1 Scope This International Standard specifies methods for preparing a sample from one or more sintered p
16、arts to be analysed for free or total carbon content. Combined carbon is determined as the difference between total and free carbon. It covers the preparation of samples for the determination of carbon by a chemical method, i.e. combustion in oxygen and measurement of the carbon dioxide produced, in
17、 accordance with ISO 437. It does not cover the preparation of samples for carbon determination by physical methods, such as metallography or spectroscopy. 2 Field of application This International Standard applies to parts in which carbon is uniformly distributed and present in the forms shown in T
18、able 1. It does not apply to parts in which the carbon is not uniformly distributed throughout the part. NOTEIn instances where the carbon is not uniformly distributed, for example a case hardened part, the method of selecting the sample should be agreed between the supplier and the purchaser. The p
19、resence of carbonaceous materials in the pores or on the surface of the part to be analysed interferes with the determination of carbon, see Table 2. Table 1 Forms of carbon that can be determined by chemical analysis Table 2 Origins of carbonaceous material and feasibility of carbon determination b
20、y chemical methods Form of carbonTypical materialsComments Combined carbon (as carbides or in solid solution) Carbon-containing steels and superalloys Determined as the difference between total and free carbon Free carbonGraphite-containing bronze, steels; material impregnated with a graphite-contai
21、ning liquid Determined by combustion of the residue of selective dissolution of the metal in the sample Total carbon (sum of combined carbon and free carbon) Determined by direct combustion of the sample Carbonaceous materialOriginFeasibility 1Liquid or semi-liquid organic substances on the surface
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