Ausferritic (bainitic) cast iron: Harmonization of international standard ISO 17804 in application to the conditions of Belarus

The experience of the Physico-technical Institute (PhTI) of the National Acdemy of Sciences of Belarus in the harmonization of international standard ISO 17804 (Founding – Ausferritic spheroidal graphite cast irons – Classification) and development of the Belorussian analogue STB ISO is described. The reasons for the choice of austempered ductile iron (ADI) as an object for standard harmonization are presented: it is the most promising cast iron in comparison with gray and classical ductile iron. The work procedure on harmonization is described: how to include the task into the State Plan on standardization, specificity of translation of the text, peculiarities of with state organizations responsible for approbation of standards such as Belorussian Institute for Standardization and Certification (BelGISS) and State Committee on Standards (Gosstandart), writing a summary of external reviews, working with critical comments from potential users. It is outlined that any foreign standard does not exists independently but is closely connected with at least 10 to 20 other standards. Thus, harmonization necessitates coordination with other standards and sometimes even with handbooks by adding annexes to the main text. The importance of a proper choice of the standard status is outlined: identical (ID) or modified (MOD). Developing an identical standard is prestigious but difficult because is requires harmonization of all the referenced standards, which is a very labor-consuming procedure. It is argued that the most suitable is ‘intermediate’ variant: adopting the authentic text of the international standard (in high-quality translation) but with annexes reflecting national specificity in this area. As a result, a harmonized standard is developed which, for the first time in Belarus, standardize the tensile strength of 800 MPa in combination with the elongation of 10 % and the tensile strength of 1400 MPa in combination with the elongation of 1 % for cast irons.

The annual demand for ADI in Belarus is estimated as about 10,000 ton. It is shown that in Belarus, where about 60 industrial enterprises have a foundry and almost every engineering plant has a heat-treatment shop, austempered ductile cast (ADI), which features a high strength, can successfully compete with rolled steel in certain applications.

1. STB ISO 683-1-2020. Stali termoobrabatyvaemye, legirovannye i avtomatnye. Chast 1. Nelegirovannye stali dlja zakalki i otpuska [Belarus standard 683-1-2020. Heat-treatable steels, alloy steels and free-cutting steels. Part 1. Non-alloy steels for quenching and tempering]. Minsk, Gosstandart Publ., 2020, 52 p.

2. STB ISO 683-2-2020. Stali termoobrabatyvaemye, legirovannye i avtomatnye. Chast 1. Nelegirovannye stali dlja zakalki i otpuska [Belarus standard 683-2-2020. Heat-treatable steels, alloy steels and free-cutting steels. Part 2. Alloy steels for quenching and tempering]. Minsk, Gosstandart Publ., 2020, 46 p.

3. STB ISO 683-3-2020. Stali termoobrabatyvaemye, legirovannye i avtomatnye. Chast 1. Nelegirovannye stali dlja zakalki i otpuska [Belarus standard 683-3-2020. Heat-treatable steels, alloy steels and free-cutting steels. Part 3. Case-hardening steels.] Minsk, Gosstandart Publ., 2020, 40 p.

4. Dudetskaya L.R., Tkacheva V.A., Pokrovskii A. I. Osobennosti beinitnogo prevrascheniya v kovkom chugune [Specific features of bainitic transformation in gray cat iron]. Materialy, tehnologii, instrumenty = Materials, technologies, tools, 1998, vol. 3, no. 2, p. 41.

5. Dudetskaya L. R., Pokrovskii A. I., Gauhshtein I. S., Demin M. I., Gurchenko P. S. Beinitny chugun: opyt polucheniya i primeneniya [Bainitic cast iron: experience in production and application]. Avtomobil’naya promyshlennost’ = Automotive industry, 2001, no. 11, pp. 33–35.

6. Dudetskaya L. R., Pokrovskii A. I., Gauhshtein I. S., Demin M. I., Gurchenko P. S. Termoobrabotka na beinitnuyu strukturu detaley iz chuguna [Heat treatment of cast iron parts for bainitic structure]. Lit’e i metallurgiya = Foundry production and metallurgy, 2002, no. 1, pp. 45–49.

7. Pokrovskii A. I., Dudetskaya L. R. Ispol’zovanie vysokoprochnogo beinitnogo chuguna dlja izgotovleniya zubchatyh koles [The use of bainitic ductile iron the producing gear wheels]. Lit’e i metallurgiya = Foundry production and metallurgy, 2015, no. 2 (79), pp. 126–134.

8. Pokrovskii A. I., Laskovnev A. P., Dudetskaya L. R. Beinitnyi chugun ili stal’noy prokat: granitsy vozmozhnostey pri izgotovlenii otvetstvennyh izdeliy [Bainitic cast iron vs. rolled steel: limits of possibilities in the manufacture of critical products]. Inzhener-mehanik = Mechanical engineer, 2016, no. 1 (70), pp. 9–21.

9. Pokrovskii A. I. Perspektivy ispol’zovaniya austenito-beinitnogo chuguna (ADI) v Belarusi [Application prospects of austeniticbainitic cast iron (ADI) in Belarus]. Inzhener-mehanik = Mechanical engineer, 2016, no. 4 (73), pp. 16–29.

10. Pokrovskii A. Development and Application of Austempered Ductile Iron (ADI) in Belarus. Saarbrücken, Lambert Academic Publishing GmbH, 2018, 63 p.

11. Pokrovskii A. I., Chaus A. S., Kunovskii E. B. Effect of the shape of graphite inclusions on acoustic characteristics of articles from cast and deformed iron. Metal Science and Heat Treatment, 2011, vol.53, no. 7–8, pp. 311–317.

12. 12. Khina B. B., Kulak M. M. Effect of ultrasound on combustion synthesis of composite material “TiC–metal binder”. Journal of Alloys and Compounds, 2013, vol. 578, pp. 595–601.