PDF
Full
Outline
In the paper, it is introduced the new steel grade 30MnCr25RE is developed for manufacturing L80-1 grade oil casing based on the performance features of hardening and tempering L80-1 grade oil casing manufactured with original steel grade 30MnCr22 by studying the effects of alloy elements in steel. The industrial casual inspection results showed that the minimum yield strength was 570 MPa and maximum yield strength was 625 MPa as well as its fluctuation range was controlled within 55 MPa for L80-1 grade oil casing manufactured with new steel grade 30MnCr25RE. Compared with the original steel grade 30MnCr22, the fluctuation range of yield strength for developed new steel grade is narrower and its performances are more stable. Moreover, the elongation increases by about 4 percentage points comparing with that of L80-1 grade oil casing manufactured with original steel grade 30MnCr22 as well as the impact energy at 0 ℃ could meet the requirements of API spec 5CT technical specification and rigorous technical requirements of users.
PDF
127
58
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
