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主要采用热模拟技术研究了不同终轧工艺和不同回火温度对石油储备罐体用高强度钢板JGR610E显微组织的影响,并利用金相和萃取复型等分析方法对不同工艺下的显微结构和碳化物进行了分析。结果表明,JGR610E钢在860℃左右终轧温度、20℃/s冷却速度下可以获得板条状低碳贝氏体组织,经过620℃回火后得到具有良好强韧性能的板条贝氏体和针状铁素体混合组织,其析出相主要有两类,尺寸在300 nm左右的为含有Fe和Mn的MxCy型碳化物,尺寸范围在50～100 nm的为含有Ti和Nb的MC型碳化物,且在该回火温度下,有大量的尺寸范围在几个纳米至十几个纳米尺寸的Ti(CN)析出。
The influence of different finishing processes and different tempering temperatures on the microstructure of high strength steel plate JGR610E for oil storage tanks was mainly studied by means of thermal simulation. Microstructure of the steel plate and extraction complex type Structure and carbides were analyzed. The results show that the low carbon bainite structure of JGR610E steel can be obtained at the finish rolling temperature of 860 ℃ and the cooling rate of 20 ℃ / s. After being tempered at 620 ℃, the lath bainite with good toughness and toughness And acicular ferrite mixed with two types of precipitates, MxCy carbides containing Fe and Mn in the size of about 300 nm, MC type containing Ti and Nb in the size range of 50 ~ 100 nm Carbide, and at this tempering temperature there are a large number of Ti (CN) precipitates in the size range of a few nanometers to a dozen nanometer sizes.