Method for smelting high nitrogen steel under ordinary pressure
A high-nitrogen steel and normal pressure technology, applied in the field of iron and steel metallurgy, can solve the problems of increased diffusion solid solution treatment, uneven composition, unstable composition control, etc., and achieve the effect of economical and efficient industrial production with good results
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Embodiment 1
[0028] Example 1: See Table 1 for the chemical composition of high-nitrogen steel smelted in an 800 kg intermediate frequency induction furnace. Add manganese nitride at the end of smelting. The used manganese nitride has a solid size of 20mm, contains 88.3% manganese and 7.1% nitrogen.
[0029] Table 1 Chemical composition of high nitrogen steel smelted by medium frequency induction furnace (the rest is Fe) and nitrogen addition
[0030]
[0031] The smelting steps are as follows:
[0032] 1) Load alloy matrix elements into the melting furnace: pure iron, high carbon iron, metallic chromium, ferrochrome;
[0033] 2) Then heat up and melt. When the alloy material melts 80%, add carbon particles and high-carbon ferrochrome, and immediately cover the slag. The composition of the slag material is C a O: CaF 2 =7:3, the amount of CaO is 17kg; metal tungsten, metal niobium and metal molybdenum are added immediately after all the materials enter the molten pool;
[0034] 3) W...
Embodiment 2
[0038] Example 2: See Table 2 for the chemical composition of high nitrogen steel smelted in a 1.5t intermediate frequency induction furnace. Add manganese nitride at the end of smelting. The solid size of manganese nitride used is 30mm, containing 90.2% manganese and 6.5% nitrogen.
[0039] Table 2 Chemical composition of high nitrogen steel smelted by medium frequency induction furnace (the rest is Fe) and nitrogen addition
[0040]
[0041] The smelting steps are as follows:
[0042] 1) Load alloy matrix elements into the melting furnace: pure iron, high carbon iron, metallic chromium, ferrochrome;
[0043] 2) Then heat up and melt. When the alloy material melts 80%, add carbon particles and high-carbon ferrochrome, and immediately cover the slag. The composition of the slag material is CaO:CaF 2 =7:3, the amount of CaO is 36kg: metal tungsten, metal niobium and metal molybdenum are added immediately after all the materials enter the molten pool;
[0044] 3) When the...
Embodiment 3
[0048] Example 3: See Table 3 for the chemical composition of high nitrogen steel smelted in a 2t intermediate frequency induction furnace. Add manganese nitride at the end of smelting. The solid size of manganese nitride used is 70mm, containing 89.5% manganese and 6.8% nitrogen.
[0049] Table 3 Chemical composition of high nitrogen steel smelted by medium frequency induction furnace (the rest is Fe) and nitrogen addition
[0050]
[0051] The smelting steps are as follows:
[0052] 1) Load alloy matrix elements into the melting furnace: pure iron, high carbon iron, metallic chromium, ferrochrome;
[0053] 2) Then heat up and melt. When the alloy material melts 80%, add carbon particles and high-carbon ferrochrome, and immediately cover the slag. The composition of the slag material is CaO:CaF 2 =7:3, the amount of CaO is 45kg; metal tungsten, metal niobium and metal molybdenum are added immediately after all the materials enter the molten pool;
[0054] 3) When the tem...
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