The Influence of Hot Forming and Heat Treatment on the Mechanical Properties of 9Ni Steel Plate for Small Pressure Storage Tanks
Taking 9Ni steel plate as the object of analysis， the different heat treatment processes of 9Ni steel plate in the head manufacturing process were simulated in the laboratory， and the properties of the test plate in hot-formed state，hot-formed state+QT state，hot-formed state+NNT state and the corres...
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Editorial Office of Special Steel
2025-03-01
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| Series: | Teshugang |
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| Online Access: | https://www.specialsteeljournal.com/fileup/1003-8620/PDF/2024-00167.pdf |
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| author | Zhang Jun, Shen Yan, Yu Xiong |
| author_facet | Zhang Jun, Shen Yan, Yu Xiong |
| author_sort | Zhang Jun, Shen Yan, Yu Xiong |
| collection | DOAJ |
| description | Taking 9Ni steel plate as the object of analysis， the different heat treatment processes of 9Ni steel plate in the head manufacturing process were simulated in the laboratory， and the properties of the test plate in hot-formed state，hot-formed state+QT state，hot-formed state+NNT state and the corresponding post-welded stress relieving state were investigated respectively.The results show that： 20 mm thick 9Ni steel test plate after 930 ℃ high-temperature hot forming，the base material structure was completely destroyed，its reverse austenite basically disappeared，the yield strength decreased by 100 MPa，and the maximum impact energy absorbed at -196 ℃ was only 10 J，it must be re-heat treated to restore the mechanical properties. After hot forming， the mechanical properties of the test plate were restored using the NNT process. Compared with the QT recovery process， the -196 ℃ impact absorption energy， room temperature yield strength， and room temperature tensile strength were significantly lower. The reason for this was that the NNT process test plate contained significantly lower content of inverted austenite than the QT process test plate. Therefore， the mechanical properties restored by QT process were good and stable. After the elongation cold deformation of 2.5%-7.5%， when the aging treatment temperature reached 250 ℃， the average aging sensitivity coefficient of 20 ℃ and-196 ℃ shock absorption energy was 0.62% to 10%， and the aging sensitivity of the base material was low；When the aging treatment temperature reached 540 ℃， the average aging sensitivity coefficient was 13.93% to 30.63%. Although the aging sensitivity of the base material slightly increased， the impact absorption energy showed a small decrease， but all were greater than 180 J. The surplus of impact absorption energy of the base material was still relatively large. |
| format | Article |
| id | doaj-art-4d66492e84e748cbb3b4475fd4717639 |
| institution | Kabale University |
| issn | 1003-8620 |
| language | zho |
| publishDate | 2025-03-01 |
| publisher | Editorial Office of Special Steel |
| record_format | Article |
| series | Teshugang |
| spelling | doaj-art-4d66492e84e748cbb3b4475fd47176392025-08-20T03:41:01ZzhoEditorial Office of Special SteelTeshugang1003-86202025-03-01462889210.20057/j.1003-8620.2024-00167The Influence of Hot Forming and Heat Treatment on the Mechanical Properties of 9Ni Steel Plate for Small Pressure Storage TanksZhang Jun, Shen Yan, Yu Xiong0Research Institute ， Jiangyin Xingcheng Special Steel Works Co.， Ltd.， Jiangyin 214400，ChinaTaking 9Ni steel plate as the object of analysis， the different heat treatment processes of 9Ni steel plate in the head manufacturing process were simulated in the laboratory， and the properties of the test plate in hot-formed state，hot-formed state+QT state，hot-formed state+NNT state and the corresponding post-welded stress relieving state were investigated respectively.The results show that： 20 mm thick 9Ni steel test plate after 930 ℃ high-temperature hot forming，the base material structure was completely destroyed，its reverse austenite basically disappeared，the yield strength decreased by 100 MPa，and the maximum impact energy absorbed at -196 ℃ was only 10 J，it must be re-heat treated to restore the mechanical properties. After hot forming， the mechanical properties of the test plate were restored using the NNT process. Compared with the QT recovery process， the -196 ℃ impact absorption energy， room temperature yield strength， and room temperature tensile strength were significantly lower. The reason for this was that the NNT process test plate contained significantly lower content of inverted austenite than the QT process test plate. Therefore， the mechanical properties restored by QT process were good and stable. After the elongation cold deformation of 2.5%-7.5%， when the aging treatment temperature reached 250 ℃， the average aging sensitivity coefficient of 20 ℃ and-196 ℃ shock absorption energy was 0.62% to 10%， and the aging sensitivity of the base material was low；When the aging treatment temperature reached 540 ℃， the average aging sensitivity coefficient was 13.93% to 30.63%. Although the aging sensitivity of the base material slightly increased， the impact absorption energy showed a small decrease， but all were greater than 180 J. The surplus of impact absorption energy of the base material was still relatively large.https://www.specialsteeljournal.com/fileup/1003-8620/PDF/2024-00167.pdf9ni steel plate； hot forming； post-welded； stress relief； reverse austenite； impact energy absorption |
| spellingShingle | Zhang Jun, Shen Yan, Yu Xiong The Influence of Hot Forming and Heat Treatment on the Mechanical Properties of 9Ni Steel Plate for Small Pressure Storage Tanks Teshugang 9ni steel plate； hot forming； post-welded； stress relief； reverse austenite； impact energy absorption |
| title | The Influence of Hot Forming and Heat Treatment on the Mechanical Properties of 9Ni Steel Plate for Small Pressure Storage Tanks |
| title_full | The Influence of Hot Forming and Heat Treatment on the Mechanical Properties of 9Ni Steel Plate for Small Pressure Storage Tanks |
| title_fullStr | The Influence of Hot Forming and Heat Treatment on the Mechanical Properties of 9Ni Steel Plate for Small Pressure Storage Tanks |
| title_full_unstemmed | The Influence of Hot Forming and Heat Treatment on the Mechanical Properties of 9Ni Steel Plate for Small Pressure Storage Tanks |
| title_short | The Influence of Hot Forming and Heat Treatment on the Mechanical Properties of 9Ni Steel Plate for Small Pressure Storage Tanks |
| title_sort | influence of hot forming and heat treatment on the mechanical properties of 9ni steel plate for small pressure storage tanks |
| topic | 9ni steel plate； hot forming； post-welded； stress relief； reverse austenite； impact energy absorption |
| url | https://www.specialsteeljournal.com/fileup/1003-8620/PDF/2024-00167.pdf |
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