Structure and characteristics of boron-containing steels for fasteners
According to TU 14-1-4486-88 and TU 14-1-5490-2004, in accordance with international standards DIN EN 10263-4, OJSC «BSW – Management Company of the Holding «BMC» produces hot-rolled products of the following grades of steel: 20Г2Р, 30Г1Р, 20MnB4, 30MnB4 and 32CrB4 microalloyed with boron. They are...
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Belarusian National Technical University
2020-04-01
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| Series: | Литьë и металлургия |
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| Online Access: | https://lim.bntu.by/jour/article/view/3174 |
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| author | H. P. Haretski N. f Solovey S. L. Shenets A. V. Tereshchenko S. V. Avdeev A. I. Pokrovskii O. I. Tolkacheva |
| author_facet | H. P. Haretski N. f Solovey S. L. Shenets A. V. Tereshchenko S. V. Avdeev A. I. Pokrovskii O. I. Tolkacheva |
| author_sort | H. P. Haretski |
| collection | DOAJ |
| description | According to TU 14-1-4486-88 and TU 14-1-5490-2004, in accordance with international standards DIN EN 10263-4, OJSC «BSW – Management Company of the Holding «BMC» produces hot-rolled products of the following grades of steel: 20Г2Р, 30Г1Р, 20MnB4, 30MnB4 and 32CrB4 microalloyed with boron. They are used for the manufacture of fasteners instead of previously used steels 35X, 38X and 40X. The use of boron-containing steels reduces the surface defects of hardware; to increase the stability of the mechanical properties of bolts, screws, studs, strength class 8.8 and 10.9 by GOST 1759.4-87; to achieve a high level of toughness at negative temperatures. It is shown that steel 20Г2Р provides stable mechanical properties of products up to M27 (in contrast to steel grades 35X, which are designed exclusively for bolts of class M16 8.8). The boron-containing steels in the delivery state with the structure of granular perlite have high technological plasticity – in the cold, the bolt head is formed and the thread is rolled without tearing in the thread hollows, as is the case with chromium steels of type 40X. It was found that their ductility increases due to the low content of carbon and chromium, as well as the formation of dispersed carbonitride-boride phases of a globular form. |
| format | Article |
| id | doaj-art-dafea6609f6b491894e5e02f456be090 |
| institution | DOAJ |
| issn | 1683-6065 2414-0406 |
| language | English |
| publishDate | 2020-04-01 |
| publisher | Belarusian National Technical University |
| record_format | Article |
| series | Литьë и металлургия |
| spelling | doaj-art-dafea6609f6b491894e5e02f456be0902025-08-20T03:02:41ZengBelarusian National Technical UniversityЛитьë и металлургия1683-60652414-04062020-04-0101253010.21122/1683-6065-2020-1-25-303081Structure and characteristics of boron-containing steels for fastenersH. P. Haretski0N. f Solovey1S. L. Shenets2A. V. Tereshchenko3S. V. Avdeev4A. I. Pokrovskii5O. I. Tolkacheva6Физико-технический институт НАН БеларусиGomselmash – Management Company of the Holding «Gomselmash»Physical-Technical Institute of National Academy of Sciences of BelarusBSW – Management Company of the Holding «BMC»BSW – Management Company of the Holding «BMC»Physical-Technical Institute of National Academy of Sciences of BelarusPhysical-Technical Institute of National Academy of Sciences of BelarusAccording to TU 14-1-4486-88 and TU 14-1-5490-2004, in accordance with international standards DIN EN 10263-4, OJSC «BSW – Management Company of the Holding «BMC» produces hot-rolled products of the following grades of steel: 20Г2Р, 30Г1Р, 20MnB4, 30MnB4 and 32CrB4 microalloyed with boron. They are used for the manufacture of fasteners instead of previously used steels 35X, 38X and 40X. The use of boron-containing steels reduces the surface defects of hardware; to increase the stability of the mechanical properties of bolts, screws, studs, strength class 8.8 and 10.9 by GOST 1759.4-87; to achieve a high level of toughness at negative temperatures. It is shown that steel 20Г2Р provides stable mechanical properties of products up to M27 (in contrast to steel grades 35X, which are designed exclusively for bolts of class M16 8.8). The boron-containing steels in the delivery state with the structure of granular perlite have high technological plasticity – in the cold, the bolt head is formed and the thread is rolled without tearing in the thread hollows, as is the case with chromium steels of type 40X. It was found that their ductility increases due to the low content of carbon and chromium, as well as the formation of dispersed carbonitride-boride phases of a globular form.https://lim.bntu.by/jour/article/view/3174boron-containing steelschromium steelsfastenershot rolled productshardenabilitypropertiesstructure |
| spellingShingle | H. P. Haretski N. f Solovey S. L. Shenets A. V. Tereshchenko S. V. Avdeev A. I. Pokrovskii O. I. Tolkacheva Structure and characteristics of boron-containing steels for fasteners Литьë и металлургия boron-containing steels chromium steels fasteners hot rolled products hardenability properties structure |
| title | Structure and characteristics of boron-containing steels for fasteners |
| title_full | Structure and characteristics of boron-containing steels for fasteners |
| title_fullStr | Structure and characteristics of boron-containing steels for fasteners |
| title_full_unstemmed | Structure and characteristics of boron-containing steels for fasteners |
| title_short | Structure and characteristics of boron-containing steels for fasteners |
| title_sort | structure and characteristics of boron containing steels for fasteners |
| topic | boron-containing steels chromium steels fasteners hot rolled products hardenability properties structure |
| url | https://lim.bntu.by/jour/article/view/3174 |
| work_keys_str_mv | AT hpharetski structureandcharacteristicsofboroncontainingsteelsforfasteners AT nfsolovey structureandcharacteristicsofboroncontainingsteelsforfasteners AT slshenets structureandcharacteristicsofboroncontainingsteelsforfasteners AT avtereshchenko structureandcharacteristicsofboroncontainingsteelsforfasteners AT svavdeev structureandcharacteristicsofboroncontainingsteelsforfasteners AT aipokrovskii structureandcharacteristicsofboroncontainingsteelsforfasteners AT oitolkacheva structureandcharacteristicsofboroncontainingsteelsforfasteners |