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In this paper, the effects of different quenched-tempered heat treatment processes on the microstructure and mechanical properties of 30CrMoA round steel for sucker rod are studied. The strength and toughness of the material are improved by adjusting the quenching and tempering temperatures as well as optimizing heat treatment process aiming at the actual application requirements of 30CrMoA steel. The experimental results showed that the yield strength, tensile strength, yield ratio and impact energy of the material could be significantly improved with proper quenching and tempering, especially under the conditions of 850 ℃ quenching(water cooling) +540 ℃ tempering (water cooling), the comprehensive mechanical properties of round steel 30CrMoA for sucker rod were the best, which was with good strength and toughness. The metallographic analysis showed that the quenched and tempered microstructure was mainly composed of tempered sorbite, which was with stable microstructure.
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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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