CN109898009A - A kind of smelting process of chrome-molybdenum steel - Google Patents
A kind of smelting process of chrome-molybdenum steel Download PDFInfo
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Abstract
The invention discloses a kind of smelting processes of chrome-molybdenum steel, it is related to technical field of smelting, including dephosphorization, desulfurization, dehydrogenation, converter boiling tapping, ladle is transported to furnaceman RH position after tapping, RH furnace transports LF furnace back after moving out, molybdenum-iron is added, ferrochrome and manganese metal and etc., it is phosphorous that the present invention smelts chrome-molybdenum steel out, sulphur, hydrogen and carbon amounts are lower, containing chromium, manganese, molybdenum amount improves, wherein embodiment 1 is optimal, the addition of manganese improves intensity and plasticity, improve work hardening capacity and wearability, effectively improve the harden ability of chrome-molybdenum steel, improve the high-temperature instantaneous intensity and ductility of steel, reduce the hot-short phenomenon of chrome-molybdenum steel, the hole of gas and loose is formed when reducing welding, improve the plasticity and impact flexibility when chrome-molybdenum steel drops to 0 DEG C or less from high temperature, optimize the welding performance and cold-bending property of chrome-molybdenum steel, improve surface matter Amount.
Description
Technical field
The present invention relates to technical field of smelting, and in particular to a kind of smelting process of chrome-molybdenum steel.
Background technique
Chrome-molybdenum steel also known as medium temperature resistant to hydrogen steel have the corrosion of good resistant to hydrogen and performance resistant to high temperature, therefore are widely transported
For refining oil, chemical industry etc. containing in hydrogen production device and high-temperature service, be one of common steel grade of pressure vessel, but due to chrome-molybdenum steel smelting
During refining, have the generation of the elements such as sulphur, phosphorus and hydrogen, sulphur exists in the form of lower melting-point FeS, it in steel with iron shape
Lower at eutectiferous eutectic temperature, only 988 DEG C, when steel solidification, iron sulfide analysis collection is in primary grain boundaries, and steel is in 1100-
1200 DEG C when being rolled, FeS on crystal boundary just will fusing, greatly weaken the binding force between crystal grain, lead to the heat of steel
Crisp phenomenon, due to the generation of SO2 when welding, will form stomata and loose if sulfur content is higher in steel in welding metal, in order to
Brittleness caused by preventing because of sulphur needs strictly to control sulphur, and the content of general control phosphorus in 0.020%-0.050%, steel is high
It can cause steel " cold short ", i.e., drop to 0 DEG C hereinafter, the plasticity and impact flexibility of steel reduce, and make the welding performance of steel from high temperature
With cold-bending property be deteriorated, it is therefore desirable to control the content of phosphorus, in steel the content height of hydrogen can in molten steel solidification and cooling procedure and
The gases such as CO, N2 are precipitated together, formed rimhole central pipe, it is loose, cause white point and hairline, it is therefore desirable to control hydrogen
Content.
China Patent Publication No. is that CN109097525A discloses a kind of smelting process of high-cleanness chrome-molybdenum steel, the smelting
Method includes that electric furnace just refines, refining, is vacuum-treated process；Refining procedure, refining use calcium carbide, can quickly be formed at low temperature
Foamed slag improves heating rate, reduces refining power consumption, reduces the air-breathing of molten steel, mitigates secondary oxidation of steel, feeds after vacuum
Deep deoxidation effect can be reinforced by entering a certain amount of pure calcium line, while may modify steel inclusion, reduce harm of the field trash to steel.This
Invention is by the completely new compound weak deoxidation of elder generation, after feeding aluminium deep deoxidation afterwards and extending vacuum retention time, soft blow time and vacuum
The various news such as Calcium treatment process for making realizes the raising of chrome molybdenum steel cleanness, and oxygen element content is reachable in resulting molten steel
10ppm hereinafter, in finished steel inclusion analysis A, B, C, D class be mingled with it is thick, thin≤0.5 grade, increase the uniform of steel plate tissue
Property, the chrome-molybdenum steel for having certain improvement to the mechanical property of steel plate, being with a wide range of applications, but produce is still due to containing
It is insufficient that the essences such as sulphur, hydrogen make chrome-molybdenum steel have that plasticity is poor, red brittleness and impact flexibility are low etc., and welding performance and cold-bending property
Difference, at the same have inside chrome-molybdenum steel shrinkage cavity, it is loose, cause chrome molybdenum steel surface have white point and hairline defect.
Summary of the invention
The purpose of the present invention is to provide a kind of smelting processes of chrome-molybdenum steel, to solve the plasticity of chrome-molybdenum steel in the prior art
Low with impact flexibility, welding performance and cold-bending property are deteriorated, and chrome-molybdenum steel generation is hot-short, and inoxidizability and corrosion resistance are low, and surface is white
The multinomial defect such as point and hairline.
A kind of smelting process of chrome-molybdenum steel, which comprises the following steps:
Step 1: dephosphorization, decarbonizing furnace clinker is added in molten steel and stirs, add activating agent and stirs, after stirring
Obtained molten steel carries out blowing 3-4min；
Step 2: desulfurization, desulfurizing agent is added in the molten steel after blowing, the desulfurizing agent ingredient is strong basicity calcium oxide,
It promotes liquid steel temperature and to 1500 DEG C and stirs 40min；
Step 3: dehydrogenation, Argon 10min, Argon amount are controlled in 0.5-0.6m in molten steel after desulfurization3/ min is simultaneously stirred
Then 15min skims；
Step 4: converter boiling is tapped, heating, control terminal tapping temperature is 1680 ± 5 DEG C, and carbon when adjustment is tapped contains
Amount is 0.05 parts by weight and oxygen activity is 600 × 10-6；
Step 5: ladle is transported to furnaceman RH position after tapping, the RH furnace vacuum degree is 0.2kPa hereinafter, time 20-
25min；
Step 6: RH furnace transports LF furnace, Argon back after moving out, Argon amount is controlled in 0.3-0.4m3/ min, at the same to first refining after
Molten steel carry out first time refining, first time refine during sequentially add 3-5kg molybdenum-iron, 15-20kg ferrochrome and
The manganese metal of 1-2kg, adjusting the chromium content in molten steel is 1.2-2.0 parts by weight, the terminal out-station temperature of control refining for the first time
It is 1680-1710 DEG C；
It is refined Step 7: carrying out second to molten steel in ladle refining furnace again, 5- is added when second of refining starts
10kg ferrochrome, adjusting the chromium content in molten steel is 2.5-3.5 parts by weight, and the terminal out-station temperature of second of refining of control is
It 1580-1600 DEG C, adds after ferrochrome continues Argon 5min later and stops Argon, skim, finally obtain chrome-molybdenum steel.
Preferably, the decarbonizing furnace slag composition in the step 1 is the strong basicity calcium oxide of 45 parts by weight, 8 parts by weight
The magnesia of silica, 10 parts by weight, the phosphorus pentoxide of 2 parts by weight, the manganese oxide of 2 parts by weight, the oxidation of 20 parts by weight
Iron, the aluminum oxide of 3 parts by weight.
Preferably, the manganese metal of 4kg molybdenum-iron, 18kg ferrochrome and 1.5kg is added in the step 6, adjusts in molten steel
Chromium content be 1.7 parts by weight, in the step 7,10kg ferrochrome is added, adjusting the chromium content in molten steel is 3.5 weight
Part, molybdenum content is 0.40 parts by weight, manganese content is 0.80 parts by weight.
Preferably, the molten steel in the step 1 and decarbonizing furnace clinker weight ratio are 22:1.
Preferably, the silicone content in the molten steel in the step 1 is 0.15-0.35 parts by weight.
Preferably, the alkalinity ranges of the decarbonizing furnace clinker are 3-5.0.
Preferably, the active agent content is 7-9 parts by weight, and by one of copper oxide, nickel oxide and cerium oxide or
Several compositions.
The present invention also provides a kind of chrome-molybdenum steel obtained using above-mentioned smelting process, the ingredients of the chrome-molybdenum steel are as follows: and carbon≤
0.03%, phosphorus≤0.02%, sulphur≤0.03%, silicon: 0.10-0.20%, chromium: 2.5-3.5%, molybdenum: 0.35-0.45%, manganese:
The Fe of 0.70-0.85% and surplus.
Beneficial effects of the present invention:
(1), it is 0.01 that it is hydrogeneous, which to smelt chrome-molybdenum steel out, by the present invention, and hydrogen content height can be in molten steel solidification and cooling procedure in steel
The gases such as CO, N2 are neutralized to be precipitated together, formed rimhole central pipe, it is loose, cause white point and hairline, the present invention smelts out
Chrome-molybdenum steel hydrogen content it is low, therefore reduce surface white point and hairline, improve surface quality.
(2), the chrome-molybdenum steel of the invention smelted out is phosphorous is less than or equal to 0.02, and the content height of phosphorus can cause steel " cold in steel
It is crisp ", i.e., 0 DEG C is dropped to hereinafter, the plasticity and impact flexibility of steel reduce, and become the welding performance of steel and cold-bending property from high temperature
Difference, it is low that the present invention smelts chrome-molybdenum steel phosphorus content out, therefore impact absorbing energy is big, and tensile strength is strong, and elongation after fracture is big, improves
The plasticity and impact flexibility of steel, improve the welding performance and cold-bending property of steel.
(3), the present invention smelts chrome-molybdenum steel sulfur-bearing out less than or equal to 0.03, since sulphur is in the form of lower melting-point FeS
In the presence of it is formed in steel with iron, and eutectiferous eutectic temperature is lower, and only 988 DEG C, when steel solidification, iron sulfide analysis collection is in original
Raw grain boundaries, when being rolled for 1100-1200 DEG C, the FeS on crystal boundary will just melt steel, greatly weaken between crystal grain
Binding force leads to the hot-short phenomenon of steel, if sulfur content is higher in steel, due to the generation of SO2 when welding, will in welding metal shape
At stomata and loose, it is low that the present invention smelts chrome-molybdenum steel sulfur content out, therefore reduces the hot-short phenomenon of chrome-molybdenum steel, reduces
The stomata that is formed in welding metal and loose, elongation after fracture increases, and improves the surface quality of chrome-molybdenum steel.
(4), the chrome-molybdenum steel of the invention smelted out is carbon containing is less than or equal to 0.02, alleviates the metallurgical load of each process.
(5), the chrome-molybdenum steel of the invention smelted out is more than or equal to 2.5 containing chromium, due to chromium matter hard containing molybdenum more than or equal to 0.35
Firmly, wear-resisting, corrosion-resistant, non-corrosive, inoxidizability and corrosion resistance with higher, the present invention smelts chrome-molybdenum steel sulfur-bearing chromium content out
It is promoted, therefore hardness improves, and improve the inoxidizability of chrome-molybdenum steel and corrosion resistance and molybdenum to improve the intensity and toughness of molten steel,
The uniformity for improving steel, optimizes welding performance.
(6) present invention smelts chrome-molybdenum steel out containing manganese more than or equal to 0.85, improves the ductility of chrome-molybdenum steel, therefore improve
Elongation at break and toughness.
Specific embodiment
In order to deepen the understanding of the present invention, the present invention will be described in further detail with reference to the examples below, the embodiment
For explaining only the invention, it is not intended to limit the scope of the present invention..
Embodiment 1
A kind of smelting process of chrome-molybdenum steel, which comprises the following steps:
Step 1: dephosphorization, decarbonizing furnace clinker is added in molten steel and stirs, add activating agent and stirs, after stirring
Obtained molten steel carries out blowing 3-4min；
Step 2: desulfurization, desulfurizing agent is added in the molten steel after blowing, the desulfurizing agent ingredient is strong basicity calcium oxide,
It promotes liquid steel temperature and to 1500 DEG C and stirs 40min；
Step 3: dehydrogenation, Argon 10min, Argon amount are controlled in 0.5-0.6m in molten steel after desulfurization3/ min is simultaneously stirred
Then 15min skims；
Step 4: converter boiling is tapped, heating, control terminal tapping temperature is 1680 ± 5 DEG C, and carbon when adjustment is tapped contains
Amount is 0.05 parts by weight and oxygen activity is 600 × 10-6；
Step 5: ladle is transported to furnaceman RH position after tapping, the RH furnace vacuum degree is 0.2kPa hereinafter, time 20-
25min；
Step 6: RH furnace transports LF furnace, Argon back after moving out, Argon amount is controlled in 0.3-0.4m3/ min, at the same to first refining after
Molten steel carry out first time refining, first time refine during sequentially add 3-5kg molybdenum-iron, 15-20kg ferrochrome and
The manganese metal of 1-2kg, adjusting the chromium content in molten steel is 1.2-2.0 parts by weight, the terminal out-station temperature of control refining for the first time
It is 1680-1710 DEG C；
It is refined Step 7: carrying out second to molten steel in ladle refining furnace again, 5- is added when second of refining starts
10kg ferrochrome, adjusting the chromium content in molten steel is 2.5-3.5 parts by weight, and the terminal out-station temperature of second of refining of control is
It 1580-1600 DEG C, adds after ferrochrome continues Argon 5min later and stops Argon, skim, finally obtain chrome-molybdenum steel.
In the present embodiment, the decarbonizing furnace slag composition in the step 1 is the strong basicity calcium oxide of 45 parts by weight, 8 weights
Measure the silica of part, the magnesia of 10 parts by weight, the phosphorus pentoxide of 2 parts by weight, the manganese oxide of 2 parts by weight, 20 parts by weight
Iron oxide, the aluminum oxide of 3 parts by weight.The gold of 4kg molybdenum-iron, 18kg ferrochrome and 1.5kg is added in the step 6
Belong to manganese, adjusts the chromium content in molten steel as 1.7 parts by weight, in the step 7,8kg ferrochrome is added, adjusts in molten steel
Chromium content is 3.3 parts by weight, and molybdenum content is 0.40 parts by weight, manganese content is 0.80 parts by weight.Molten steel in the step 1 with
Decarbonizing furnace clinker weight ratio is 22:1.The silicone content in molten steel in the step 1 is 0.15-0.35 parts by weight.The decarburization
The alkalinity ranges of furnace clinker are 3-5.0.The active agent content is 7-9 parts by weight, and by copper oxide, nickel oxide and cerium oxide
One or more of compositions.
The present invention also provides a kind of chrome-molybdenum steel obtained using above-mentioned smelting process, the ingredients of the chrome-molybdenum steel are as follows: and carbon≤
0.03%, phosphorus≤0.02%, sulphur≤0.03%, silicon: 0.10-0.20%, chromium: 2.5-3.5%, molybdenum: 0.35-0.45%, manganese:
The Fe of 0.70-0.85% and surplus.
Embodiment 2
A kind of smelting process of chrome-molybdenum steel, which comprises the following steps:
Step 1: dephosphorization, decarbonizing furnace clinker is added in molten steel and stirs, add activating agent and stirs, after stirring
Obtained molten steel carries out blowing 3-4min；
Step 2: desulfurization, desulfurizing agent is added in the molten steel after blowing, the desulfurizing agent ingredient is strong basicity calcium oxide,
It promotes liquid steel temperature and to 1500 DEG C and stirs 40min；
Step 3: dehydrogenation, Argon 10min, Argon amount are controlled in 0.5-0.6m in molten steel after desulfurization3/ min is simultaneously stirred
Then 15min skims；
Step 4: converter boiling is tapped, heating, control terminal tapping temperature is 1680 ± 5 DEG C, and carbon when adjustment is tapped contains
Amount is 0.05 parts by weight and oxygen activity is 600 × 10-6；
Step 5: ladle is transported to furnaceman RH position after tapping, the RH furnace vacuum degree is 0.2kPa hereinafter, time 20-
25min；
Step 6: RH furnace transports LF furnace, Argon back after moving out, Argon amount is controlled in 0.3-0.4m3/ min, at the same to first refining after
Molten steel carry out first time refining, first time refine during sequentially add 3-5kg molybdenum-iron, 15-20kg ferrochrome and
The manganese metal of 1-2kg, adjusting the chromium content in molten steel is 1.2-2.0 parts by weight, the terminal out-station temperature of control refining for the first time
It is 1680-1710 DEG C；
It is refined Step 7: carrying out second to molten steel in ladle refining furnace again, 5- is added when second of refining starts
10kg ferrochrome, adjusting the chromium content in molten steel is 2.5-3.5 parts by weight, and the terminal out-station temperature of second of refining of control is
It 1580-1600 DEG C, adds after ferrochrome continues Argon 5min later and stops Argon, skim, finally obtain chrome-molybdenum steel.
In the present embodiment, the decarbonizing furnace slag composition in the step 1 is the strong basicity calcium oxide of 45 parts by weight, 8 weights
Measure the silica of part, the magnesia of 10 parts by weight, the phosphorus pentoxide of 2 parts by weight, the manganese oxide of 2 parts by weight, 20 parts by weight
Iron oxide, the aluminum oxide of 3 parts by weight.The metal of 3kg molybdenum-iron, 15kg ferrochrome and 1kg is added in the step 6
Manganese adjusts the chromium content in molten steel as 1.3 parts by weight, in the step 7,6kg ferrochrome is added, adjusts the chromium in molten steel
Content is 2.5 parts by weight, and molybdenum content is 0.35 parts by weight, manganese content is 0.7 parts by weight.Molten steel and decarburization in the step 1
Furnace clinker weight ratio is 22:1.The silicone content in molten steel in the step 1 is 0.15-0.35 parts by weight.The decarbonizing furnace furnace
The alkalinity ranges of slag are 3-5.0.The active agent content is 7-9 parts by weight, and by one in copper oxide, nickel oxide and cerium oxide
Kind or several compositions.
Embodiment 3
A kind of smelting process of chrome-molybdenum steel, which comprises the following steps:
Step 1: dephosphorization, decarbonizing furnace clinker is added in molten steel and stirs, add activating agent and stirs, after stirring
Obtained molten steel carries out blowing 3-4min；
Step 2: desulfurization, desulfurizing agent is added in the molten steel after blowing, the desulfurizing agent ingredient is strong basicity calcium oxide,
It promotes liquid steel temperature and to 1500 DEG C and stirs 40min；
Step 3: dehydrogenation, Argon 10min, Argon amount are controlled in 0.5-0.6m in molten steel after desulfurization3/ min is simultaneously stirred
Then 15min skims；
Step 4: converter boiling is tapped, heating, control terminal tapping temperature is 1680 ± 5 DEG C, and carbon when adjustment is tapped contains
Amount is 0.05 parts by weight and oxygen activity is 600 × 10-6；
Step 5: ladle is transported to furnaceman RH position after tapping, the RH furnace vacuum degree is 0.2kPa hereinafter, time 20-
25min；
Step 6: RH furnace transports LF furnace, Argon back after moving out, Argon amount is controlled in 0.3-0.4m3/ min, at the same to first refining after
Molten steel carry out first time refining, first time refine during sequentially add 3-5kg molybdenum-iron, 15-20kg ferrochrome and
The manganese metal of 1-2kg, adjusting the chromium content in molten steel is 1.2-2.0 parts by weight, the terminal out-station temperature of control refining for the first time
It is 1680-1710 DEG C；
It is refined Step 7: carrying out second to molten steel in ladle refining furnace again, 5- is added when second of refining starts
10kg ferrochrome, adjusting the chromium content in molten steel is 2.5-3.5 parts by weight, and the terminal out-station temperature of second of refining of control is
It 1580-1600 DEG C, adds after ferrochrome continues Argon 5min later and stops Argon, skim, finally obtain chrome-molybdenum steel.
In the present embodiment, the decarbonizing furnace slag composition in the step 1 is the strong basicity calcium oxide of 45 parts by weight, 8 weights
Measure the silica of part, the magnesia of 10 parts by weight, the phosphorus pentoxide of 2 parts by weight, the manganese oxide of 2 parts by weight, 20 parts by weight
Iron oxide, the aluminum oxide of 3 parts by weight.The metal of 5kg molybdenum-iron, 20kg ferrochrome and 2kg is added in the step 6
Manganese adjusts the chromium content in molten steel as 2.0 parts by weight, in the step 7,10kg ferrochrome is added, adjusts the chromium in molten steel
Content is 3.5 parts by weight, and molybdenum content is 0.45 parts by weight, manganese content is 0.85 parts by weight.Molten steel in the step 1 and de-
Carbon furnace clinker weight ratio is 22:1.The silicone content in molten steel in the step 1 is 0.15-0.35 parts by weight.The decarbonizing furnace
The alkalinity ranges of clinker are 3-5.0.The active agent content is 7-9 parts by weight, and by copper oxide, nickel oxide and cerium oxide
One or more composition.
42 chrome-molybdenum steel to above-mentioned 3 embodiments and in the market carry out composition test and performance test, as a result such as the following table 1
With table 2:
1 composition test result of table
2 the performance test results of table
By comparing with 42 chrome-molybdenum steel in the market, it is lower that the present invention smelts phosphorous chrome-molybdenum steel out, sulphur, hydrogen and carbon amounts, contains
Chromium, manganese, molybdenum amount improve, and wherein embodiment 1 is optimal, and the addition of manganese improves intensity and plasticity, improve work hardening capacity and
Wearability effectively improves the harden ability of chrome-molybdenum steel, improves the high-temperature instantaneous intensity and ductility of steel, and impact absorbing energy significantly, subtracts
The hot-short phenomenon for having lacked chrome-molybdenum steel forms the hole of gas and loose when reducing welding, improve chrome-molybdenum steel from high temperature drop to 0 DEG C with
Plasticity and impact flexibility when lower optimize the welding performance and cold-bending property of chrome-molybdenum steel, improve surface quality.
Obviously present invention specific implementation is not subject to the restrictions described above, as long as using method concept and skill of the invention
The improvement for the various unsubstantialities that art scheme carries out, or not improved the conception and technical scheme of the invention are directly applied to it
Its occasion, in protection scope of the present invention.
Claims (9)
1. a kind of smelting process of chrome-molybdenum steel, which comprises the following steps:
Step 1: dephosphorization, decarbonizing furnace clinker is added in molten steel and stirs, add activating agent and stirs, to being obtained after stirring
Molten steel carry out blowing 3-4min；
Step 2: desulfurization, desulfurizing agent is added in the molten steel after blowing, the desulfurizing agent ingredient is strong basicity calcium oxide, is promoted
Liquid steel temperature is to 1500 DEG C and stirs 40min；
Step 3: dehydrogenation, Argon 10min, Argon amount are controlled in 0.5-0.6m in molten steel after desulfurization3/ min simultaneously stirs 15min,
Then it skims；
Step 4: converter boiling is tapped, heating, control terminal tapping temperature is 1680 ± 5 DEG C, and carbon content when adjustment is tapped is
0.05 parts by weight and oxygen activity are 600 × 10-6；
Step 5: ladle is transported to furnaceman RH position after tapping, the RH furnace vacuum degree is 0.2kPa hereinafter, time 20-25min；
Step 6: RH furnace transports LF furnace, Argon back after moving out, Argon amount is controlled in 0.3-0.4m3/ min, while to the steel after first refining
Water carries out first time refining, sequentially adds 3-5kg molybdenum-iron, 15-20kg ferrochrome and 1-2kg during refining first time
Manganese metal, adjust molten steel in chromium content be 1.2-2.0 parts by weight, control for the first time refining terminal out-station temperature be
1680-1710℃；
It is refined Step 7: carrying out second to molten steel in ladle refining furnace again, 5-10kg is added when second of refining starts
Ferrochrome, adjusting the chromium content in molten steel is 2.5-3.5 parts by weight, and the terminal out-station temperature of second of refining of control is
It 1580-1600 DEG C, adds after ferrochrome continues Argon 5min later and stops Argon, skim, finally obtain chrome-molybdenum steel.
2. a kind of smelting process of chrome-molybdenum steel according to claim 1, which is characterized in that the decarburization in the step 1
Furnace slag composition is the strong basicity calcium oxide of 45 parts by weight, the magnesia of the silica of 8 parts by weight, 10 parts by weight, 2 parts by weight
Phosphorus pentoxide, the manganese oxide of 2 parts by weight, the iron oxide of 20 parts by weight, the aluminum oxide of 3 parts by weight.
3. a kind of smelting process of chrome-molybdenum steel according to claim 2, which is characterized in that be added in the step 6
The manganese metal of 4kg molybdenum-iron, 18kg ferrochrome and 1.5kg, adjusting the chromium content in molten steel is 1.7 parts by weight, the step 7
In, 10kg ferrochrome is added, the chromium content adjusted in molten steel is 3.5 parts by weight, and molybdenum content is 0.40 parts by weight, manganese content is
0.80 parts by weight.
4. a kind of smelting process of chrome-molybdenum steel according to claim 3, which is characterized in that the molten steel in the step 1
It is 22:1 with decarbonizing furnace clinker weight ratio.
5. a kind of smelting process of chrome-molybdenum steel according to claim 4, which is characterized in that the molten steel in the step 1
In silicone content be 0.15-0.35 parts by weight.
6. a kind of smelting process of chrome-molybdenum steel according to claim 5, which is characterized in that the alkali of the decarbonizing furnace clinker
Degree range is 3-5.0.
7. a kind of smelting process of chrome-molybdenum steel according to claim 6, which is characterized in that the active agent content is 7-
9 parts by weight, and be made of one or more of copper oxide, nickel oxide and cerium oxide.
8. a kind of chrome-molybdenum steel, which is characterized in that the chrome-molybdenum steel produces to obtain using method described in claim 1.
9. a kind of chrome-molybdenum steel according to claim 8, which is characterized in that the ingredient of the chrome-molybdenum steel are as follows: carbon≤
0.03%, phosphorus≤0.02%, sulphur≤0.03%, silicon: 0.10-0.20%, chromium: 2.5-3.5%, molybdenum: 0.35-0.45%, manganese:
The Fe of 0.70-0.85% and surplus.
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Application publication date: 20190618 |