Abstract: The rating of inclusions in steel 15CrMoG for boiler tube (/%: 0. 12 〜0. 18C, 0. 17 - 0. 35Si, 0. 40 〜0. 70Mn, ≤0.015P, ≤O. 010S, 0. 80 〜1. 10Cr, 0. 40 〜0. 55M。≤0. 08 V, ≤0. 020Alt) is that C series ≤1.0 and Ds series ≤1.0. The production flow sheet of the steel is hot metal pretreatment-120 t LD-LF-RH-280 mm x 380 mm bloom casting-rolling to Φ 100 ~ Φ120 mm round tube blank. With hot metal deepening desulphurization, LD end point controlling 0. 03% - 0. 09% C, 0. 004% -0. 012% P, 0. 006% -0. 015% S, low aluminium deoxidation with adding 2. 5 kg/t aluminium-iron, and using refining slag with basicity 3 ~4, as a result in liquid steel in tundish the P content is 0. 005% ~ 0. 012%, the S content is 0. 005% 〜0. 008% and the aluminium content is 0. 004% 〜0. 008%, and each index of round tube blank all meets the requirement of user terms of agreement.

摘要： 锅炉管用钢15CrMoG(/%:0.12～0.18C、0.17～0.35Si、0.40～0.70Mn、≤0.015P、≤0.010S、0.80～1.10Cr、0.40～0.55Mo、≤0.08V、≤0.020Alt)要求非金属夹杂物的级别C≤1.0、Ds≤1.0。该钢的生产流程为铁水预处理-120 t LD-LF-RH-280 mm×380 mm连铸坯-轧制Φ100～Φ120 mm圆管坯。通过铁水深脱硫、LD终点控制0.03%～0.09%C、0.004%～0.012%P、0.006%～0.015%S,加铝铁2.5 kg/t的低铝脱氧,使用碱度为3～4的精炼渣,使中间包钢水的P含量为0.005%～0.012%,S含量0.005%～0.008%,Al含量为0.004%～0.008%,圆管坯的各项指标均满足用户协议要求。

关键词: 电站, 锅炉管用钢15CrMoG, 磷硫;铝, 生产实践