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目前在那些没有淬火设备的轧管厂里屈服点55公斤/毫米~2的高强度套管用38CrNiMo钢生产,随后进行回火。为生产石油管,特别是生产套管拟用较便宜的28Mn2SiVNb钢试制。这种钢的钢管机械性能在淬火后也和38CrNiMo钢管一样,而冲击韧性、脆断的倾向性、加热时晶粒长大的趋势、疲劳强度、应力集中的敏感性等都超过了保证这些管子在使用时的最大可靠性。 28Mn2SiVNb钢(0.26～0.33％碳;1.3～1.6％ Mn;0.4～0.7 Si;0.08～0.12％V及0.02～0.04％Nb)在250吨的平炉中采用废钢法,用天燃气和重油作燃料进行熔炼。钢水在炉内和钢包中脱氧。向炉内添加锰铁的一半和25％的高炉硅铁
At present there is no quenching equipment in the rolling mill yield point 55 kg / mm ~ 2 high-strength casing 38CrNiMo steel production, followed by tempering. For the production of petroleum pipe, especially the production of casing intended to use cheaper 28Mn2SiVNb steel trial. The mechanical properties of steel after quenching and 38CrNiMo steel pipe the same, and the impact toughness, brittle fracture tendency, the trend of grain growth when heated, fatigue strength, stress concentration sensitivity and more than guarantee these tubes When used in the greatest reliability. 28Mn2SiVNb steels (0.26-0.33% carbon; 1.3-1.6% Mn; 0.4-0.7% Si; 0.08-0.12% V and 0.02-0.04% Nb) were scrap-milled in 250-ton open hearth furnaces using natural gas and heavy oil as fuel Melting. The molten steel is deoxidized in the furnace and in the ladle. Add half of the ferromanganese and 25% of the blast furnace ferrosilicon to the furnace