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The hot rolled coil plate for pipeline steel is mainly used for manufacturing delivery welded pipe of petroleum and natural gas. In this paper, the development of hot rolled coil plate for L485M pipeline steel with heavy gauge and low costs is introduced. The design with diversified alloy systems of C-Mn-Cr-Mo or C-Mn-Cr-Mo-Ni as well as smelting of clean steel and thermo mechanical control process (TMCP) are adopted. The microstructure of developed L485M hot rolled coil plate is acicular ferrite+granular bainite and precipitate is homogeneous. The L485M hot rolled coil plate is with such characteristics as high strength and excellent low temperature toughness through such mechanisms as dislocation strengthening and precipitation strengthening. The experimental results showed that the L485M hot rolled coil plates with and without Ni element could meet the technical requirements as well as was with capacity of batch production, which is beneficial for enterprises to reduce costs and increase benefits.
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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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