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Outline
In this paper, the design of new economical steel grade, laboratory researches and industrial trial production of BNS line pipe in sour service are carried out. The results showed that such properties as the yield strength, tensile strength, elongation, impact properties and Vickers hardness of trial-produced steel pipe (as-hot-rolled and after normalizing treatment of 890 ℃) could meet the requirements of API 5L standard. After normalizing treatment of 890 ℃, the low temperature impact toughness of steel pipe is significantly improved and its ductile-brittle transition temperature is reduced from -10 ℃ (as-hot-rolled) to -50 ℃ (as-normalized condition) as well as its banded structure is improved and grain size of matrix is refined from grade 7(as-hot-rolled) to grade 8.5 with normalizing treatment.
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| 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 |
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