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The chemical compositions of seamless steel pipe with wall thickness greater than 25 mm for X65Q grade line pipe are designed based on low-C Mn containing steel with microalloying technology and the optimum heat treatment process is determined by laboratory study. The test results showed that the strength and low temperature impact toughness of the material matched well with the heat treatment process of “910 ℃ quenching+670 ℃ tempering”, microstructure in the steel was mainly bainite+a small quantity of tempered sorbite, grain size was 8.5 grade; low temperature impact energy of the material at -30 ℃ was over 120 J and surplus of yield strength of the material was about 80 MPa through industrial batch production testing so that the designed steel grade could be used in productions of X65Q or higher grade line pipe with wall thickness greater than 25 mm, which could meet the requirements of related performance indexes of users.
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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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