CN110846550B - Intermediate frequency furnace smelting process for nitrogen-containing and niobium-containing high-temperature alloy - Google Patents
Intermediate frequency furnace smelting process for nitrogen-containing and niobium-containing high-temperature alloy Download PDFInfo
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Abstract
The invention discloses a process for smelting a nitrogen-containing and niobium-containing high-temperature alloy in an intermediate frequency furnace, which changes the crystal boundary state of the alloy through reasonable smelting process control and greatly improves the effect of the 750 ℃ tensile plasticity of the alloy. The technical scheme of the invention comprises the following process flows: batching → stock preparation → charging → electrification → melting about 80% → adding ferrochromium nitride, manganese metal → full melting → deoxidation and refining → mixing component → adding ferroniobium and ferrovanadium → microalloying → pouring; in the specific technical measures of GH1016 alloy intermediate frequency furnace smelting, the time from niobium-iron and vanadium-iron addition to tapping is definitely controlled within 40min, which is a hard requirement; by controlling the contact time of the nitrogen element and the niobium and vanadium elements, the formation of primary carbonitride in the smelting process is reduced, so that the nitrogen and niobium elements with higher concentration are retained in the matrix, a necklace-shaped Z phase is precipitated on the forged crystal boundary, and the high-temperature plasticity of the alloy at 750 ℃ is greatly improved.
Description
Technical Field
The invention belongs to a special alloy smelting process, and particularly relates to an intermediate frequency furnace smelting process suitable for nitrogen-containing and niobium-containing GH1016 alloy.
Background
The GH1016 alloy is an iron-nickel-chromium-based high-temperature alloy strengthened by niobium, nitrogen, tungsten, molybdenum and vanadium, has the main characteristic of being strengthened by nitrogen, and is a typical case of a low-cost high-temperature alloy which is self-developed in China and replaces nickel by nitrogen. The alloy has higher high-temperature heat resistance and thermal stability, can be used below 950 ℃ for a long time, and is strengthened by a Z phase (chromium niobium nitride with tetragonal lattice). The problem of medium temperature low plasticity exists for a long time, particularly in GH1016 alloy products produced by an intermediate frequency furnace, the plasticity at 750 ℃ always wanders around a standard line (the elongation is more than or equal to 30 percent, and the surface shrinkage is more than or equal to 35 percent).
Disclosure of Invention
The invention discloses a process for smelting a nitrogen-containing and niobium-containing high-temperature alloy in an intermediate frequency furnace, which changes the crystal boundary state of the alloy through reasonable smelting process control and greatly improves the effect of the 750 ℃ tensile plasticity of the alloy.
1. The technical scheme of the invention comprises the following process flows:
batching → stock preparation → charging → electrification → melting about 80% → adding ferrochromium nitride, manganese metal → full melting → deoxidation and refining → mixing component → adding ferroniobium, ferrovanadium → micro-alloying → pouring
2. Specific process measures
The weight percentage of chemical components of the GH1016 alloy conforms to the specification of Table 1, and the materials are prepared according to the chemical components.
TABLE 1 GH1016 alloy chemistry (wt.%)
TABLE 1 (continuation)
| Element(s) | V | Mn | Si | S | P | B | Ce |
| Technical standard | 0.1～0.3 | ≤1.80 | ≤0.60 | ≤0.015 | ≤0.020 | ≤0.01 | ≤0.05 |
Secondly, calculating the amount of various raw materials required by smelting according to the alloy component control requirements.
Preparing raw materials including metal nickel, metal chromium, ferromolybdenum, ferrotungsten, refined steel, ferrovanadium, ferrosilicon, ferroniobium, metal manganese, ferrochromium nitride and a carbon electrode; the surface of the raw material must be clean and dry, no oil stain and oxidation exist, and the chemical composition is accurate;
adding the metal nickel, the ferrosilicon, the ferromolybdenum, the ferrotungsten, the refined steel and the metal chromium in sequence, and adding the ferrochromium nitride and the metal manganese after melting about 80%;
and fifthly, deoxidizing and refining by adopting a diffusion deoxidation mode after full melting for 30-60 min.
Sixthly, analyzing components in the furnace, and adjusting the components of elements such as chromium, nitrogen, tungsten, molybdenum and the like according to the result.
And adding the niobium iron and the vanadium iron according to calculated amount, and keeping for 5-15 min.
Adding B and Ce elements to microalloy.
Ninthly, tapping and pouring.
And c, controlling the time from step c to tapping pouring within 40 min.
Description of the invention points:
firstly, the time from adding ferroniobium and ferrovanadium to tapping is defined in detail, which is a hard requirement.
② a detailed process for GH1016 alloy intermediate frequency furnace smelting, which is not recorded by relevant literature data.
And thirdly, by controlling the contact time of the nitrogen element and the niobium and vanadium elements, the formation of primary carbonitride in the smelting process is reduced, so that the nitrogen and niobium elements with higher concentration are retained in the matrix, a necklace-shaped Z phase is precipitated on the forged crystal boundary, and the plasticity of the alloy at the high temperature of 750 ℃ is greatly improved.
Drawings
FIG. 1 shows that the precipitated phase on the grain boundary of the bar is very little (100X) before the process is improved;
FIG. 2 shows that after the process is improved, a great amount of necklace-shaped precipitated phases (100X) are precipitated on the grain boundaries of the bars.
Detailed Description
The present invention is described in detail below by way of examples.
The common execution procedures of the embodiment 1, the embodiment 2 and the embodiment 3 are as follows:
the weight percentage of chemical components of the GH1016 alloy conforms to the specification of Table 1, and the materials are prepared according to the chemical components.
Secondly, calculating the amount of various raw materials required by smelting according to the alloy component control requirements.
Preparing raw materials including metal nickel, metal chromium, ferromolybdenum, ferrotungsten, refined steel, ferrovanadium, ferrosilicon, ferroniobium, metal manganese, ferrochromium nitride and a carbon electrode; the surface of the raw material must be clean and dry, no oil stain and oxidation exist, and the chemical composition is accurate;
adding the metal nickel, the ferrosilicon, the ferromolybdenum, the ferrotungsten, the refined steel and the metal chromium in sequence, and adding the ferrochromium nitride and the metal manganese after melting about 80%;
and fifthly, deoxidizing and refining by adopting a diffusion deoxidation mode after full melting for 30-60 min.
Sixthly, analyzing components in the furnace, and adjusting the components of elements such as chromium, nitrogen, tungsten, molybdenum and the like according to the result.
Adding B and Ce elements to microalloy.
Ninthly, tapping and pouring.
Example 1
GH1016 alloy, electrode ingot type phi 215mm, furnace number 18250140337
And adding ferroniobium and ferrovanadium according to calculated amount, and keeping for 5 min.
And c, pouring steel out for 28min from step c.
The implementation effect is as follows:
example 2
GH1016 alloy, electrode ingot type phi 215mm, furnace number 18250140338
And adding the niobium iron and the vanadium iron according to calculated amount, and keeping for 10 min.
And c, pouring steel tapping for 20min from step c.
The implementation effect is as follows:
example 3
GH1016 alloy, electrode ingot type phi 215mm, furnace number 18250140339
And adding ferroniobium and ferrovanadium according to calculated amount, and keeping for 15 min.
And c, pouring steel tapping for 40min from step c.
The implementation effect is as follows:
Claims (4)
1. a process for smelting a nitrogen-containing and niobium-containing high-temperature alloy in an intermediate frequency furnace is characterized by comprising the following steps of: the process flow is as follows: batching → stock preparation → charging → electrification → melting about 80% → adding ferrochromium nitride, manganese metal → full melting → deoxidation and refining → mixing component → adding ferroniobium and ferrovanadium → microalloying → pouring;
chemical compositions of a nitrogen-containing niobium-containing high-temperature alloy GH1016 alloy are as follows: carbon not more than 0.08%, chromium: 19.0% -22.0%, tungsten: 5.0% -6.0%, molybdenum: 2.6% -3.3%, niobium: 0.9% -1.4%, nitrogen: 0.13% -0.25%, nickel: 32.0% -36.0%, iron: and the balance, vanadium: 0.1 to 0.3 percent of manganese, not more than 1.80 percent of manganese, not more than 0.60 percent of silicon, not more than 0.015 percent of sulfur, not more than 0.020 percent of phosphorus, not more than 0.01 percent of boron and not more than 0.05 percent of cerium;
secondly, calculating the amount of various raw materials required by smelting according to the chemical components of the alloy;
preparing raw materials including metal nickel, metal chromium, refined steel, ferromolybdenum, ferrotungsten, ferrovanadium, ferrosilicon, ferroniobium, metal manganese, ferrochromium nitride and a carbon electrode; the surface of the raw material must be clean and dry, no oil stain and oxidation exist, and the chemical composition is accurate;
adding the metal nickel, the ferrosilicon, the ferromolybdenum, the ferrotungsten, the refined steel and the metal chromium in sequence, and adding the ferrochromium nitride and the metal manganese after melting about 80%;
deoxidizing and refining by adopting a diffusion deoxidation mode after full melting for 30-60 min;
sixthly, analyzing components in the furnace, and adjusting elements such as chromium, nitrogen, tungsten, molybdenum and the like according to the result;
seventhly, adding ferroniobium and ferrovanadium according to calculated amount, and keeping for 5-15 min;
adding boron and cerium elements to carry out micro-alloying;
ninthly, tapping and pouring, wherein the time from step (c) to tapping and pouring is controlled within 40 min; by controlling the contact time of the nitrogen element and the niobium and vanadium elements, the formation of primary carbonitride in the smelting process is reduced, so that the nitrogen and niobium elements with higher concentration are retained in the matrix, a necklace-shaped Z phase is precipitated on the forged crystal boundary, and the high-temperature plasticity of the alloy at 750 ℃ is greatly improved.
2. The intermediate frequency furnace smelting process of the nitrogen-containing and niobium-containing high-temperature alloy according to claim 1, characterized by comprising the following steps of: adding ferrocolumbium and ferrovanadium for 5 min; the pouring time from the addition of ferrocolumbium and ferrovanadium to tapping is 28 min.
3. The intermediate frequency furnace smelting process of the nitrogen-containing and niobium-containing high-temperature alloy according to claim 1, characterized by comprising the following steps of: adding ferrocolumbium and ferrovanadium for 10 min; the casting time from the adding of the ferrocolumbium and the ferrovanadium to tapping is 20 min.
4. The intermediate frequency furnace smelting process of the nitrogen-containing and niobium-containing high-temperature alloy according to claim 1, characterized by comprising the following steps of: adding ferrocolumbium and ferrovanadium for 15 min; the pouring time from the addition of ferrocolumbium and ferrovanadium to tapping is 40 min.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003089815A (en) * | 2001-09-14 | 2003-03-28 | Nisshin Steel Co Ltd | METHOD FOR MANUFACTURING HIGH-PURITY Fe-Cr ALLOY AND Fe-Cr-Ni ALLOY |
| CN1804096A (en) * | 2006-01-20 | 2006-07-19 | 烟台百思特炉管厂 | Microalloyed nickel chromium high-temperature alloy material and method for preparing the same |
| CN104561664A (en) * | 2014-12-09 | 2015-04-29 | 抚顺特殊钢股份有限公司 | Smelting technique of novel nickel-iron-base high-temperature alloy GH4169D |
| CN105238934A (en) * | 2015-09-24 | 2016-01-13 | 北京北冶功能材料有限公司 | Vacuum induction melting method for reducing nitrogen content in high temperature alloy |
| CN108531730A (en) * | 2018-04-10 | 2018-09-14 | 抚顺特殊钢股份有限公司 | The vacuum induction furnace smelting technique of lanthanum element recovery rate in a kind of raising high temperature alloy |
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- 2019-12-02 CN CN201911212002.6A patent/CN110846550B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003089815A (en) * | 2001-09-14 | 2003-03-28 | Nisshin Steel Co Ltd | METHOD FOR MANUFACTURING HIGH-PURITY Fe-Cr ALLOY AND Fe-Cr-Ni ALLOY |
| CN1804096A (en) * | 2006-01-20 | 2006-07-19 | 烟台百思特炉管厂 | Microalloyed nickel chromium high-temperature alloy material and method for preparing the same |
| CN104561664A (en) * | 2014-12-09 | 2015-04-29 | 抚顺特殊钢股份有限公司 | Smelting technique of novel nickel-iron-base high-temperature alloy GH4169D |
| CN105238934A (en) * | 2015-09-24 | 2016-01-13 | 北京北冶功能材料有限公司 | Vacuum induction melting method for reducing nitrogen content in high temperature alloy |
| CN108531730A (en) * | 2018-04-10 | 2018-09-14 | 抚顺特殊钢股份有限公司 | The vacuum induction furnace smelting technique of lanthanum element recovery rate in a kind of raising high temperature alloy |
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