一、钢种设计12.5万瓩蒸汽发电机组的超高压(出口压力为155大气压)锅炉汽包,急需一种适合于下列要求的中温钢。σ_s≥43公斤/毫米~2;σ≥60公厅/毫米~2;δ_5≥18%;常温 a_k≥7公斤·米/厘米~2;时效 a_k≥4公斤·米/厘米~2;冷弯:b=2a,d=3a 良好;350℃时σ_s≥40公斤/毫米~2。焊接和冷热加工性能良好;适当的高温蠕变和持久强度。钢板需在900～1050℃热卷成型和600～650℃退火以消除应力。 First, the design of steel 12.5 million 瓩 steam turbine ultra-high pressure (outlet pressure of 155 atm) boiler drum, an urgent need for a moderate temperature steel in the following requirements. σ_s ≥ 43 kg / mm ~ 2; σ ≥ 60 mm / 2; δ_5 ≥ 18%; room temperature a_k ≥ 7 kg · m / cm ~ 2; aging a_k ≥ 4 kg · m / cm ~ 2; : b = 2a, d = 3a good; σ_s ≥ 40 kg / mm ~ 2 at 350 ℃. Welding and hot and cold processing performance is good; appropriate high temperature creep and long-lasting strength. The steel sheet should be hot-rolled at 900-1050 ℃ and annealed at 600-650 ℃ to eliminate the stress.