The quality of semi-finished steel
The article deals with the quality of structural steel supplied by metallurgical enterprises. It is shown that the pipes made of steel 20, used in the oil and gas industry, contain structurally free cementite in the structure, often in the form of a grid (points 4 and 5 according to GOST 5640–68). T...
| Main Author: | |
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| Format: | Article |
| Language: | English |
| Published: |
Belarusian National Technical University
2019-04-01
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| Series: | Litʹë i Metallurgiâ |
| Subjects: | |
| Online Access: | https://lim.bntu.by/jour/article/view/2716 |
| _version_ | 1811213784064196608 |
|---|---|
| author | A. G. Anisovich |
| author_facet | A. G. Anisovich |
| author_sort | A. G. Anisovich |
| collection | DOAJ |
| description | The article deals with the quality of structural steel supplied by metallurgical enterprises. It is shown that the pipes made of steel 20, used in the oil and gas industry, contain structurally free cementite in the structure, often in the form of a grid (points 4 and 5 according to GOST 5640–68). This structure is the cause of faulty production: the subsequent cold treatment pressure formed sags on the surface of the product, and there is a violation of the continuity of the material up to the formation of through cracks. Formation of structurally-free cementite in steel 40KHN2MA with structure of the top bainite which was formed at violation of regulations of heat treatment of a semi-finished product is also found. When nitriding with heating to 490 ° C and holding at this temperature, there was a decay of bainite with the formation of tertiary cementite along the grain boundaries. Discussed the possibility of culling the poor quality of delivery at the consumer. It is also noted that many enterprises have now abolished entrance control, which has the most negative consequences both in terms of product quality and safety, especially in the oil and gas industry. |
| first_indexed | 2024-04-12T05:52:01Z |
| format | Article |
| id | doaj.art-8263d2ac714a468a93a3e5951340016e |
| institution | Directory Open Access Journal |
| issn | 1683-6065 2414-0406 |
| language | English |
| last_indexed | 2024-04-12T05:52:01Z |
| publishDate | 2019-04-01 |
| publisher | Belarusian National Technical University |
| record_format | Article |
| series | Litʹë i Metallurgiâ |
| spelling | doaj.art-8263d2ac714a468a93a3e5951340016e2022-12-22T03:45:18ZengBelarusian National Technical UniversityLitʹë i Metallurgiâ1683-60652414-04062019-04-010110210710.21122/1683-6065-2019-1-102-1072684The quality of semi-finished steelA. G. Anisovich0Physical-Engineering Institute of the NAS of BelarusThe article deals with the quality of structural steel supplied by metallurgical enterprises. It is shown that the pipes made of steel 20, used in the oil and gas industry, contain structurally free cementite in the structure, often in the form of a grid (points 4 and 5 according to GOST 5640–68). This structure is the cause of faulty production: the subsequent cold treatment pressure formed sags on the surface of the product, and there is a violation of the continuity of the material up to the formation of through cracks. Formation of structurally-free cementite in steel 40KHN2MA with structure of the top bainite which was formed at violation of regulations of heat treatment of a semi-finished product is also found. When nitriding with heating to 490 ° C and holding at this temperature, there was a decay of bainite with the formation of tertiary cementite along the grain boundaries. Discussed the possibility of culling the poor quality of delivery at the consumer. It is also noted that many enterprises have now abolished entrance control, which has the most negative consequences both in terms of product quality and safety, especially in the oil and gas industry.https://lim.bntu.by/jour/article/view/2716carbon steelstructurally free cementiteaging of ferritecold deformationentrance controlheat treatment |
| spellingShingle | A. G. Anisovich The quality of semi-finished steel Litʹë i Metallurgiâ carbon steel structurally free cementite aging of ferrite cold deformation entrance control heat treatment |
| title | The quality of semi-finished steel |
| title_full | The quality of semi-finished steel |
| title_fullStr | The quality of semi-finished steel |
| title_full_unstemmed | The quality of semi-finished steel |
| title_short | The quality of semi-finished steel |
| title_sort | quality of semi finished steel |
| topic | carbon steel structurally free cementite aging of ferrite cold deformation entrance control heat treatment |
| url | https://lim.bntu.by/jour/article/view/2716 |
| work_keys_str_mv | AT aganisovich thequalityofsemifinishedsteel AT aganisovich qualityofsemifinishedsteel |