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Outline
X65 pipeline steel is mainly used in the manufacture of oil and gas pipelines, requiring high strength, high toughness, brittle fracture and good welding performance, but it is easy to appear slab defects in the continuous casting process, which will reduce the comprehensive performance of pipeline steel. In the paper, the high-temperature plasticity of X65 pipeline steel slab is studied. The hot tensile test is carried out by using Gleeble-1500D thermal simulation testing machine, and under the strain rate of 2.0 × 10-3/s, deformation temperature of 700~1 300 ℃, the fracture strength and the section shrinkage change with temperature are analyzed. The fracture morphology is observed by scanning electron microscope, and the cause of fracture is clarified to provide a theoretical basis for continuous casting production.
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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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