CN103695599A - Low-alloy steel CBM20 microalloying method - Google Patents
Low-alloy steel CBM20 microalloying method Download PDFInfo
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- CN103695599A CN103695599A CN201310690888.1A CN201310690888A CN103695599A CN 103695599 A CN103695599 A CN 103695599A CN 201310690888 A CN201310690888 A CN 201310690888A CN 103695599 A CN103695599 A CN 103695599A
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Abstract
In order to solve the problems of internal porosity, excessive internal microcrack defects, low flaw detection percentage of pass and the like existing in low-alloy steel CBM20 in the prior art, the invention provides a low-alloy steel CBM20 microalloying method. The method comprises the steps: preparing a low-alloy steel CBM20 steel ingot by using an electric arc furnace (EF), an LF (Ladle Refining) process, a VD (Vacuum Distillation) ladle refining furnace and a die casting process; adding Fe-V and Fe-B to a ladle after carrying out vacuum treatment by using the VD ladle refining furnace; stirring by using argon gas; and then, casting to form an ingot. The low-alloy steel CBM20 microalloying method provided by the invention has the beneficial technical effects that the internal porosity and the number of the internal microcrack defects of the CBM20 steel ingot can be effectively reduced, the high-temperature strength and compactness of the low-alloy steel CBM20 are effectively improved, and the flaw detection percent of pass obtained after the low-alloy steel CBM20 is processed is increased to over 95%.
Description
Technical field
The present invention relates to a kind of low alloy steel micro-alloying technology, specially refer to a kind of low alloy steel CBM20 microalloying method.
Background technology
The structural alloy steel of low alloy steel CBM20 Xi Wo company exploitation, due to it, to have processing thermoplastic good, the characteristics such as mechanical tenacity height, be widely used in surface cementation process after the production of all kinds of axles and axle sleeve component.Because the alloy content of CBM20 material is lower, its typical composition C0.15～0.17 that is weight percentage, Mn0.75～0.80, Si0.24～0.28, S0.004～0.006, P0.005～0.015, Cr1.10～1.15, Mo0.26～0.28, V0.04～0.06, its carbon content is positioned near peritectic point, in its cooled and solidified process, easily form the tissue defects such as loose and internal tiny crack, make its hot strength lower and not fine and close.Conventionally, after machining, its flaw detection qualification rate is always in 50% left and right, and major ABO incompatibility lattice are former because internal defect and internal tiny crack defect exceed standard.The problems such as obviously, prior art low alloy steel CBM20 exists internal defect and internal tiny crack defect exceeds standard, and flaw detection qualification rate is lower.
Summary of the invention
For solving the problems such as internal defect and the internal tiny crack defect of prior art low alloy steel CBM20 existence exceed standard, and flaw detection qualification rate is lower, the present invention proposes a kind of low alloy steel CBM20 microalloying method.Low alloy steel CBM20 microalloying method of the present invention, adopt electric arc furnace EF+ refining LF+VD type ladle refining furnace+die casting process to prepare low alloy steel CBM20 steel ingot, it is characterized in that, after the vacuum-treat of VD type ladle refining furnace, in ladle, add vanadium iron Fe-V and ferro-boron Fe-B, employing argon gas stirs, and then, then is cast into ingot;
The typical composition of described low alloy steel CBM20 C0.15～0.17 that is weight percentage, Mn0.75～0.80, Si0.24～0.28, S0.004～0.006, P0.005～0.015, Cr1.10～1.15, Mo0.26～0.28, V0.04～0.06;
Described vanadium iron Fe-V and the ferro-boron Fe-B of adding in ladle, comprises, after VD vacuum-treat, in ladle, adds Fe-V50 and Fe-B; Add-on 0.8～1.2kg/ ton molten steel of its Fe-V50, Fe-B add-on 0.4～0.6kg/ ton molten steel.
Further, low alloy steel CBM20 microalloying method of the present invention, comprises the following steps:
S1, employing electric arc furnace EF melting molten steel;
S2, employing ladle refining LF carry out refining to low alloy steel CBM20 molten steel, comprise, deoxidation is also adjusted alloy ingredient by technical requirements;
S3, employing VD type ladle refining furnace carry out vacuum-treat to low alloy steel CBM20 molten steel, carry out deoxidation dehydrogenation;
S4, in ladle, add vanadium iron Fe-V50 and ferro-boron Fe-B, adopt argon gas to stir, comprise add-on 0.8～1.2kg/ ton molten steel of Fe-V50, Fe-B add-on 0.4～0.6kg/ ton molten steel; Argon flow amount 4-6 liter/min, pressure 0.3MPa, 5 minutes time;
S5, be cast into 5 tons of ingots, note fast ingot body 400-480 second, filling 350-450 second, 4 hours red forged steel of delivering to;
The typical composition of described low alloy steel CBM20 C0.15～0.17 that is weight percentage, Mn0.75～0.80, Si0.24～0.28, S0.004～0.006, P0.005～0.15, Cr1.10～1.15, Mo0.26～0.28, V0.04～0.06.
The useful technique effect of low alloy steel CBM20 microalloying method of the present invention is the quantity that can effectively reduce CBM20 steel ingot internal defect and internal tiny crack defect, effectively improve hot strength and the compactness of low alloy steel CBM20, the flaw detection qualification rate after low alloy steel CBM20 processing is brought up to more than 95%.
Accompanying drawing explanation
Accompanying drawing 1 is the step schematic diagram of low alloy steel CBM20 microalloying method of the present invention.
Below in conjunction with the drawings and specific embodiments, low alloy steel CBM20 microalloying method of the present invention is further described.
Embodiment
Accompanying drawing 1 is the step schematic diagram of low alloy steel CBM20 microalloying method of the present invention, as seen from the figure, low alloy steel CBM20 microalloying method of the present invention, adopt electric arc furnace EF+ refining LF+VD type ladle refining furnace+die casting process to prepare low alloy steel CBM20 steel ingot, it is characterized in that, after the vacuum-treat of VD type ladle refining furnace, in ladle, add vanadium iron Fe-V and ferro-boron Fe-B, employing argon gas stirs, and then, then is cast into ingot;
The typical composition of described low alloy steel CBM20 C0.15～0.17 that is weight percentage, Mn0.75～0.80, Si0.24～0.28, S0.004～0.006, P0.005～0.15, Cr1.10～1.15, Mo0.26～0.28, V0.04～0.06;
Described vanadium iron Fe-V and the ferro-boron Fe-B of adding in ladle, comprises, after VD vacuum-treat, in ladle, adds Fe-V50 and Fe-B; Add-on 0.8～1.2kg/ ton molten steel of its Fe-V50, Fe-B add-on 0.4～0.6kg/ ton molten steel.
Further, low alloy steel CBM20 microalloying method of the present invention, comprises the following steps:
S1, employing electric arc furnace EF melting molten steel;
S2, employing ladle refining LF carry out refining to low alloy steel CBM20 molten steel, comprise, deoxidation is also adjusted alloy ingredient by technical requirements;
S3, employing VD type ladle refining furnace carry out vacuum-treat to low alloy steel CBM20 molten steel, carry out deoxidation dehydrogenation;
S4, in ladle, add vanadium iron Fe-V50 and ferro-boron Fe-B, adopt argon gas to stir, comprise add-on 0.8～1.2kg/ ton molten steel of Fe-V50, Fe-B add-on 0.4～0.6kg/ ton molten steel; 4～6 liters/min of argon flow amounts, pressure 0.3MPa, 5 minutes time;
S5, be cast into ingot, note fast ingot body 400-480 second, filling 350-450 second, 4 hours red forged steel of delivering to;
The typical composition of described low alloy steel CBM20 C0.15～0.17 that is weight percentage, Mn0.75～0.80, Si0.24～0.28, S0.004～0.006, P0.005～0.15, Cr1.10～1.15, Mo0.26～0.28, V0.04～0.06.
Embodiment 1
Heat (batch) number 13V317, steel grade CBM20, ingot shape 5T, number 5;
Electric arc furnace EF melting, oxygen blast is fluxed, and oxygen is pressed 0.4Mpa; 1595 ℃ of dark oxygen blast of temperature, oxygen is pressed 1.0Mpa, and sampling, skims 90%, 1645 ℃ of temperature, tapping; Molten steel weight percentages C0.05, Si0.02, Mn0.05, P0.005, S0.095, Cr0.25, Mo0.02;
Ladle refining LF, adds lime 300kg, high carbon ferro-chrome 50kg, low carbon ferrochromium 350kg, manganese metal 90kg, molybdenum-iron 70kg; After 30 minutes, add silicon calcium powder 40kg; Sampling, 1651 ℃ of temperature; Add high carbon ferro-chrome 30kg, 1679 ℃ of temperature, hang out, slagging-off 40%; Molten steel weight percentages C0.12, Si0.15, Mn0.66, P0.006, S0.035, Cr1.05, Mo0.21;
VD type ladle refining, adjusts 1665 ℃ of temperature, and vapor pressure 1Mpa, starts to vacuumize, and vacuum tightness 67Pa keeps 35 minutes, and vacuum tightness 35Pa is broken empty;
Add vanadium iron Fe-V50 and ferro-boron Fe-B, adjust 1595 ℃ of temperature, add Fe-V50,25kg; Add Fe-B, 12kg; 4～6 liters/min of argon flow amounts, pressure 0.3Mpa, 5 minutes time;
Be cast into ingot, note fast ingot body 400-480 second, filling 350-450 second, 4 hours red forged steel of delivering to.
Embodiment 2
Heat (batch) number 13V668, steel grade CBM20, ingot shape 5T, number 5; The making step of embodiment 2 is identical with embodiment 1, and supplementary material add-on, condition are controlled also identical with embodiment 1 with Composition Control, is actually the replica test of embodiment 1.
Embodiment 3
Heat (batch) number 13V689, steel grade CBM20, ingot shape 5T, number 5; The making step of embodiment 3 is identical with embodiment 1, and supplementary material add-on, condition are controlled also identical with embodiment 1 with Composition Control, is actually the replica test of embodiment 1
The chemical composition of embodiment 1 to 3 low alloy steel CBM20 is as shown in the table.
| ? | Heat (batch) number | Steel grade | C | Mn | Si | S | P | Cr | Mo | V |
| Example 1 | 13V317 | CBM20 | 0.15 | 0.75 | 0.27 | 0.005 | 0.005 | 1.14 | 0.26 | 0.05 |
| Example 2 | 13V668 | CBM20 | 0.17 | 0.79 | 0.27 | 0.005 | 0.009 | 1.11 | 0.27 | 0.05 |
| Example 3 | 13V689 | CBM20 | 0.15 | 0.77 | 0.24 | 0.005 | 0.014 | 1.1 | 0.26 | 0.06 |
As seen from the above table, adopt low alloy steel CBM20 microalloying method of the present invention, after VD type ladle refining, in the situation that in molten steel, oxygen level is lower and temperature is lower, add vanadium iron Fe-V50 and ferro-boron Fe-B and adopt argon gas to stir, make oxidizable V, B element is not oxidized or less oxidized, can be in the situation that meeting chemical composition and meeting the demands, effectively reduce the quantity of steel ingot internal defect and internal tiny crack defect, improve hot strength and the compactness of low alloy steel CBM20, flaw detection qualification rate after low alloy steel CBM20 processing is brought up to more than 95%.
Obviously, the useful technique effect of low alloy steel CBM20 microalloying method of the present invention is the quantity that can effectively reduce CBM20 steel ingot internal defect and internal tiny crack defect, effectively improve hot strength and the compactness of low alloy steel CBM20, the flaw detection qualification rate after low alloy steel CBM20 processing is brought up to more than 95%.
Claims (2)
1. a low alloy steel CBM20 microalloying method, adopt electric arc furnace EF+ refining LF+VD type ladle refining furnace+die casting process to prepare low alloy steel CBM20 steel ingot, it is characterized in that, after the vacuum-treat of VD type ladle refining furnace, in ladle, add vanadium iron Fe-V and ferro-boron Fe-B, employing argon gas stirs, and then, then is cast into ingot;
The typical composition of described low alloy steel CBM20 C0.15～0.17 that is weight percentage, Mn0.75～0.80, Si0.24～0.28, S0.004～0.006, P0.005～0.015, Cr1.10～1.15, Mo0.26～0.28, V0.04～0.06;
Described vanadium iron Fe-V and the ferro-boron Fe-B of adding in ladle, comprises, after VD vacuum-treat, in ladle, adds Fe-V50 and Fe-B; Add-on 0.8～1.2kg/ ton molten steel of its Fe-V50, Fe-B add-on 0.4～0.6kg/ ton molten steel.
2. low alloy steel CBM20 microalloying method according to claim 1, is characterized in that, the method comprises the following steps:
S1, employing electric arc furnace EF melting molten steel;
S2, employing ladle refining LF carry out refining to low alloy steel CBM20 molten steel, comprise, deoxidation is also adjusted alloy ingredient by technical requirements;
S3, employing VD type ladle refining furnace carry out vacuum-treat to low alloy steel CBM20 molten steel, carry out deoxidation dehydrogenation;
S4, in ladle, add vanadium iron Fe-V50 and ferro-boron Fe-B, adopt argon gas to stir, comprise add-on 0.8～1.2kg/ ton molten steel of Fe-V50, Fe-B add-on 0.4～0.6kg/ ton molten steel; Argon flow amount 4-6 liter/min, pressure 0.3MPa, 5 minutes time;
S5, be cast into 5 tons of ingots, note fast ingot body 400-480 second, filling 350-450 second, 4 hours red forged steel of delivering to;
The typical composition of described low alloy steel CBM20 C0.15～0.17 that is weight percentage, Mn0.75～0.80, Si0.24～0.28, S0.004～0.006, P0.005～0.015, Cr1.10～1.15, Mo0.26～0.28, V0.04～0.06.
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Patent Citations (6)
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| CN101831598A (en) * | 2010-05-26 | 2010-09-15 | 马鞍山钢铁股份有限公司 | Low alloy steel for resisting sulfuric acid dew point corrosion and production method thereof |
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