Cause analysis of surface micro-cracks on 12Mn pipeline steel
In order to find out the causes of defects in 12Mn pipeline steel produced by a Chinese steel pipe plant, the characteristics of the defects are analyzed and discussed by means of metallographic microscope, scanning electron microscope, ASPEX scanning electron microscope and transmission electron mi...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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EDP Sciences
2022-01-01
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| Series: | MATEC Web of Conferences |
| Online Access: | https://www.matec-conferences.org/articles/matecconf/pdf/2022/05/matecconf_msms2022_01013.pdf |
| _version_ | 1811245937487511552 |
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| author | Tian Yushi Chu Shaoyang Xu Lijun Wei Jun Qiu Shengtao Zhu Rong |
| author_facet | Tian Yushi Chu Shaoyang Xu Lijun Wei Jun Qiu Shengtao Zhu Rong |
| author_sort | Tian Yushi |
| collection | DOAJ |
| description | In order to find out the causes of defects in 12Mn pipeline steel produced by a Chinese steel pipe plant, the characteristics of the defects are analyzed and discussed by means of metallographic microscope, scanning electron microscope, ASPEX scanning electron microscope and transmission electron microscope and so on. The physical and chemical tests results show that there are several typical micro-cracks after slight grinding the pipe outer skin in which a few large particles of brittle alumina reside, which possess the macrocharacteristics of continuously curving and extending along the radial direction as well as many clear and smooth inner edges and few secondary branches, so that the cracks are not experienced a long and hightemperature oxidation process. The industrial tests indicate that most of the defects have been proved occurred in the quenching and tempering process of the steel pipe production. The main cause of steel pipe cracking is the stress concentration arose from some large brittle inclusions in the quenching process. When the critical strength of the steel pipe is exceeded by quenching stress, a micro-crack will generate and propagate along the grain boundary. These defects of steel pipes could be eliminated by means of taking steelmaking process optimization measures. |
| first_indexed | 2024-04-12T14:45:41Z |
| format | Article |
| id | doaj.art-e93eb499e9714fd9a7a0b705e10fa296 |
| institution | Directory Open Access Journal |
| issn | 2261-236X |
| language | English |
| last_indexed | 2024-04-12T14:45:41Z |
| publishDate | 2022-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | MATEC Web of Conferences |
| spelling | doaj.art-e93eb499e9714fd9a7a0b705e10fa2962022-12-22T03:28:38ZengEDP SciencesMATEC Web of Conferences2261-236X2022-01-013580101310.1051/matecconf/202235801013matecconf_msms2022_01013Cause analysis of surface micro-cracks on 12Mn pipeline steelTian Yushi0Chu Shaoyang1Xu Lijun2Wei Jun3Qiu Shengtao4Zhu Rong5School of Metallurgical and Ecological Engineering, University of Science and Technology BeijingNational Engineering Research Center of Continuous Casting Technology, Central Iron and Steel Research InstituteNational Engineering Research Center of Continuous Casting Technology, Central Iron and Steel Research InstituteNational Engineering Research Center of Continuous Casting Technology, Central Iron and Steel Research InstituteSchool of Metallurgical and Ecological Engineering, University of Science and Technology BeijingSchool of Metallurgical and Ecological Engineering, University of Science and Technology BeijingIn order to find out the causes of defects in 12Mn pipeline steel produced by a Chinese steel pipe plant, the characteristics of the defects are analyzed and discussed by means of metallographic microscope, scanning electron microscope, ASPEX scanning electron microscope and transmission electron microscope and so on. The physical and chemical tests results show that there are several typical micro-cracks after slight grinding the pipe outer skin in which a few large particles of brittle alumina reside, which possess the macrocharacteristics of continuously curving and extending along the radial direction as well as many clear and smooth inner edges and few secondary branches, so that the cracks are not experienced a long and hightemperature oxidation process. The industrial tests indicate that most of the defects have been proved occurred in the quenching and tempering process of the steel pipe production. The main cause of steel pipe cracking is the stress concentration arose from some large brittle inclusions in the quenching process. When the critical strength of the steel pipe is exceeded by quenching stress, a micro-crack will generate and propagate along the grain boundary. These defects of steel pipes could be eliminated by means of taking steelmaking process optimization measures.https://www.matec-conferences.org/articles/matecconf/pdf/2022/05/matecconf_msms2022_01013.pdf |
| spellingShingle | Tian Yushi Chu Shaoyang Xu Lijun Wei Jun Qiu Shengtao Zhu Rong Cause analysis of surface micro-cracks on 12Mn pipeline steel MATEC Web of Conferences |
| title | Cause analysis of surface micro-cracks on 12Mn pipeline steel |
| title_full | Cause analysis of surface micro-cracks on 12Mn pipeline steel |
| title_fullStr | Cause analysis of surface micro-cracks on 12Mn pipeline steel |
| title_full_unstemmed | Cause analysis of surface micro-cracks on 12Mn pipeline steel |
| title_short | Cause analysis of surface micro-cracks on 12Mn pipeline steel |
| title_sort | cause analysis of surface micro cracks on 12mn pipeline steel |
| url | https://www.matec-conferences.org/articles/matecconf/pdf/2022/05/matecconf_msms2022_01013.pdf |
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