Vacuum induction melting method of high-oxygen-content steel

[0025] Low-carbon, high-sulfur, high-oxygen AISI 1215 free-cutting steel is smelted in a vacuum induction furnace with a charging capacity of 80kg.

[0026] 1. Chemical composition of the target steel grade: (unit: wt%)

[0027]

[0028] 2. Raw materials: (unit: wt%)

[0029]

[0030] 3. Specific operation steps:

[0031] 1) charging: put 78kg of industrial pure iron into the crucible;

[0032] 2) Vacuuming: After the vacuum degree is evacuated to 48Pa, it is filled with 5000Pa argon;

[0033] 3) Initial smelting: 78kg of industrial pure iron is induction smelted in the furnace until it is clear;

[0034] 4) Refining pre-decarburization: put 40g of iron oxide scale into the crucible, perform secondary vacuuming to make the vacuum degree reach 68Pa, and conduct induction refining for 8 minutes to remove a small amount of C, N and others in industrial pure iron Volatile impurity elements;

[0035] 5) Pre-oxygenation: After refining, fill the furnace with 5000Pa oxygen to

[0044] Low-carbon, high-sulfur, high-oxygen AISI 1215 free-cutting steel is smelted in a vacuum induction furnace with a charging capacity of 80kg.

[0045] 1. Chemical composition of the target steel grade: (unit: wt%)

[0046]

[0047] 2. Raw materials: (unit: wt%)

[0048] Same as Example 1.

[0049] 3. Specific operation steps:

[0050] 1) charging: put 78kg of industrial pure iron into the crucible;

[0051] 2) Vacuuming: After the vacuum degree is evacuated to 48Pa, it is filled with 5000Pa argon;

[0052] 3) Initial smelting: 78kg of industrial pure iron is induction smelted in the furnace until it is clear;

[0053] 4) Refining pre-decarburization: put 40g of iron oxide scale into the crucible, perform secondary vacuuming to make the vacuum degree reach 68Pa, and conduct induction refining for 8 minutes to remove a small amount of C, N and others in industrial pure iron Volatile impurity elements;

[0054] 5) Pre-oxygenation: After refining, fill the furnace with