CN109355582B - Smelting process of boron-containing steel for engineering machinery - Google Patents

Smelting process of boron-containing steel for engineering machinery Download PDF

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CN109355582B
CN109355582B CN201811295218.9A CN201811295218A CN109355582B CN 109355582 B CN109355582 B CN 109355582B CN 201811295218 A CN201811295218 A CN 201811295218A CN 109355582 B CN109355582 B CN 109355582B
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steel
aluminum
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CN109355582A (en
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杨利委
王国柱
周剑
孔凡杰
王震
李林
宋金平
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Nanjing Iron and Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron

Abstract

The invention relates to a smelting process of boron-containing steel for engineering machinery, which comprises the following steps: scrap steel and hot-charged molten iron → electric arc furnace smelting → LF refining → VD vacuum refining → continuous casting to form a blank; the boron-containing steel for engineering machinery comprises the following chemical components in percentage by mass: c: 0.32-0.36%, Mn: 0.90-1.20%, P: less than or equal to 0.025%, S: 0.015 to 0.030%, Si: 0.15-0.35%, Cr: less than or equal to 0.25 percent, Ni: less than or equal to 0.20 percent, Cu: less than or equal to 0.20 percent, Mo: less than or equal to 0.08 percent, B: 0.0010-0.0025%, Alt: 0.020-0.040%, and the balance of Fe and inevitable impurities. According to the smelting process of the steel for the boron-containing engineering machinery, the purity of the molten steel can meet the requirements of continuous casting production and inclusion of users, the surface quality of a continuous casting blank can be ensured to be stable, and the defects of transverse cracks, angular cracks and the like on the surface of the blank can be avoided in the continuous production condition.

Description

Smelting process of boron-containing steel for engineering machinery
Technical Field
The invention relates to a smelting process for steel for boron-containing engineering machinery, belonging to the field of metallurgy.
Background
Construction machines are an important component of the equipment industry. In general, mechanical equipment necessary for comprehensive mechanized construction works required for earth and stone construction works, road surface construction and maintenance, mobile lifting, loading and unloading operations, and various construction works is called as construction machinery. Data research shows that more than 20 years in the past are the fastest period for improving the urbanization rate of China, and the demand on engineering machinery is greatly increased due to the rapid improvement of the urbanization rate, so that the golden development period of the domestic engineering machinery industry is achieved.
The steel used by the engineering machinery has higher requirements on strength and toughness, belongs to a consumable part, has large market demand, generally reduces the contents of noble alloy elements such as Cr, Ni and Mo, and the like in order to reduce the production cost, and properly adds certain special alloy elements. The addition of boron is used in this context. After 0.0005% -0.0050% of boron is added into the steel, the hardenability of the steel is greatly improved, the mechanical property after heat treatment can be improved, and a large amount of alloy elements can be replaced by trace amount of boron. The boron resource of China is very rich, so that the boron resource is extremely thick. Boron is known as vitamin in steel, but the affinity of the boron with nitrogen and oxygen is extremely strong, and the adding process of boron has great influence on the yield of boron and the performance of steel. In the prior art, the smelting process of the steel for boron-containing engineering machinery causes low boron yield and more casting blank surface defects, and can not meet the urgent requirement of reducing the cost.
Disclosure of Invention
The invention aims to solve the technical problem that aiming at the defects existing in the prior art, the invention provides the smelting process of the steel for the boron-containing engineering machinery, and the purity of the molten steel can meet the requirements of continuous casting production and inclusion of users; can ensure the stable surface quality of the continuous casting billet, and the defects of transverse crack, angular crack and the like on the surface of the billet can not occur in the continuous production condition.
The technical scheme for solving the technical problems is as follows:
a smelting process of boron-containing steel for engineering machinery comprises the following steps: scrap steel and hot-charged molten iron → electric arc furnace smelting → LF refining → VD vacuum refining → continuous casting to form a blank; the boron-containing steel for engineering machinery comprises the following chemical components in percentage by mass: c: 0.32-0.36%, Mn: 0.90-1.20%, P: less than or equal to 0.025%, S: 0.015 to 0.030%, Si: 0.15-0.35%, Cr: 0.05 to 0.25%, Ni: 0.02-0.20%, Cu: 0.02 to 0.20%, Mo: 0.01-0.08%, B: 0.0010-0.0025%, Alt: 0.020-0.040%, and the balance of Fe and inevitable impurities;
in the smelting process of the electric arc furnace, the adding amount of hot charging molten iron is controlled to account for 50-70% of the total charging amount, the tapping temperature is 1640-;
in the LF refining process, the end point S is controlled to be below 0.006 percent, the white slag is kept for 20-45min, calcium treatment is carried out 5min before vacuum after refining is finished, and the calcium feeding amount is converted into pure calcium amount which is controlled to be 0.04-0.05kg/t per ton of steel;
in the VD vacuum refining process, the process control vacuum degree is less than or equal to 1 mbar and is kept for more than or equal to 18min, argon is used as stirring gas, the flow of two paths of bottom stirring argon is controlled at 150l/min, the nitrogen content is measured after the vacuum treatment is finished, the nitrogen content is required to be less than or equal to 35ppm, aluminum wires are fed in sequence after the vacuum is broken to adjust the aluminum component, ferrotitanium cored wires 140 and 180m are fed after the aluminum wires are fed with static stirring for more than or equal to 2min, ferrotitanium cored wires are fed with ferroboron 0.14-0.16kg/t of steel after the ferroboron cored wires are fed with static stirring for more than or equal to 5min, sulfur wires 140 and 160m (equivalent to pure sulfur 0.20-0.25kg/t of steel) are fed after the ferroboron is fed for more than or equal to 5min, then the sampling analysis is carried out to analyze.
The invention has the beneficial effects that: 1) the smelting process can realize industrialized mass production, and the purity of the molten steel can meet the requirements of continuous casting production and inclusion of users. 2) The smelting process can ensure the stable surface quality of the continuous casting billet, and the defects of transverse cracks, angular cracks and the like on the surface of the billet are not generated under the condition of continuous production. 3) The blank produced by the smelting process of the invention improves the flaw detection qualification rate of the surface of a rolled material to more than 85 percent from about 75 percent, improves the yield and reduces the production cost. 4) The invention improves the yield of boron element from 45-50% to 75-80% by purposefully controlling the adding sequence of each alloy and optimizing the addition of titanium element.
Detailed Description
Example 1
The embodiment is a smelting process of boron-containing steel for engineering machinery, which comprises the following steps: scrap steel and hot-charged molten iron → 100t EBT electric arc furnace smelting → 100t LF refining → 90t VD vacuum degassing → continuous casting to form a blank.
The boron-containing steel for engineering machinery in the embodiment comprises the following chemical components in percentage by mass: c: 0.32%, Mn: 0.90%, P: 0.025%, S: 0.015%, Si: 0.15%, Cr: 0.05%, Ni: 0.02%, Cu: 0.02%, Mo: 0.01%, B: 0.0010%, Alt: 0.020%, and the balance Fe and inevitable impurities.
In the smelting process of an electric arc furnace, the adding amount of hot charging molten iron is controlled to account for 50% of the total charging amount, the tapping temperature is 1640 ℃, preliminary alloying is carried out during tapping, argon is used for stirring simultaneously, the flow of two paths of argon is controlled to be 500l/min, aluminum is inserted for tapping during electric furnace tapping alloying, and the using amount of aluminum-containing raw materials is 1.4kg/t of molten steel of pure aluminum;
in the LF refining process, the end point S is controlled to be below 0.006 percent, the white slag is kept for 20min, calcium treatment is carried out 5min before vacuum after refining is finished, and the calcium feeding amount is converted into pure calcium amount which is controlled to be 0.04kg/t per ton of steel.
In the VD vacuum refining process, the process control vacuum degree is less than or equal to 1 mbar and is kept for more than or equal to 18min, argon is used as stirring gas, the flow of two paths of bottom stirring argon is controlled at 100l/min, the nitrogen content is measured after the vacuum treatment is finished, the nitrogen content is required to be less than or equal to 35ppm, aluminum wires are fed in sequence to adjust the aluminum components after the vacuum is broken, ferrotitanium core-spun yarns are fed in 140m after the aluminum wires are fed for more than or equal to 2min after the static stirring is finished, ferrotitanium core-spun yarns are fed in after the static stirring is finished for more than or equal to 5min, ferroboron is added in 0.14kg/t steel, ferroboron is fed in 140m after the ferroboron is finished for more than or equal to 5 min.
The blank produced by the smelting process of the embodiment enables the qualification rate of the surface flaw detection of the rolled material to be improved to more than 85 percent from about 75 percent, improves the yield and reduces the production cost; the yield of the boron element is improved to 75-80% from the previous 45-50% by purposefully controlling the adding sequence of each alloy and optimizing the addition of the titanium element.
Example 2
The embodiment is a smelting process of boron-containing steel for engineering machinery, which comprises the following steps: scrap steel and hot-charged molten iron → 100t EBT electric arc furnace smelting → 100t LF refining → 90t VD vacuum degassing → continuous casting to form a blank.
The boron-containing steel for engineering machinery in the embodiment comprises the following chemical components in percentage by mass: c: 0.34%, Mn: 0.98%, P: 0.005%, S: 0.020%, Si: 0.25%, Cr: 0.15%, Ni: 0.09%, Cu: 0.12%, Mo: 0.05%, B: 0.0020%, Alt: 0.030%, and the balance Fe and inevitable impurities.
In the smelting process of the electric arc furnace, the adding amount of hot charging molten iron is controlled to account for 60 percent of the total charging amount, the tapping temperature is 1660 ℃, preliminary alloying is carried out during tapping, argon is used for stirring simultaneously, the flow of two paths of argon is controlled to be 550l/min, aluminum is inserted and tapped during electric furnace tapping alloying, and the using amount of aluminum-containing raw materials is 1.5kg/t molten steel of pure aluminum.
In the LF refining process, the end point S is controlled to be below 0.006 percent, the white slag is kept for 35min, calcium treatment is carried out 5min before vacuum after refining is finished, and the calcium feeding amount is converted into pure calcium amount which is controlled to be 0.045kg/t per ton of steel.
In the VD vacuum refining process, the process control vacuum degree is less than or equal to 1 mbar and is kept for more than or equal to 18min, argon is used as stirring gas, the two paths of bottom stirring argon flow are controlled to be 130l/min, the nitrogen content is measured after the vacuum treatment is finished, the nitrogen content is required to be less than or equal to 35ppm, aluminum components are adjusted by feeding aluminum wires in sequence after the vacuum is broken, ferrotitanium core-spun wires are fed for 160m after the aluminum wires are fed for more than or equal to 2min, ferrotitanium core-spun wires are fed for 0.15kg/t steel after the ferrotitanium core-spun wires are fed for more than or equal to 5min, sulfur wires are fed for 150m after the ferroboron is fed for more than or equal to 5min, then sampling is carried out, the full.
The blank produced by the smelting process of the embodiment enables the qualification rate of the surface flaw detection of the rolled material to be improved to more than 85 percent from about 75 percent, improves the yield and reduces the production cost; the yield of the boron element is improved to 75-80% from the previous 45-50% by purposefully controlling the adding sequence of each alloy and optimizing the addition of the titanium element.
Example 3
The embodiment is a smelting process of boron-containing steel for engineering machinery, which comprises the following steps: scrap steel and hot-charged molten iron → 100t EBT electric arc furnace smelting → 100t LF refining → 90t VD vacuum degassing → continuous casting to form a blank.
The boron-containing steel for engineering machinery in the embodiment comprises the following chemical components in percentage by mass: c: 0.36%, Mn: 1.20%, P: 0.015%, S: 0.030%, Si: 0.35%, Cr: 0.25%, Ni: 0.20%, Cu: 0.20%, Mo: 0.08%, B: 0.0025%, Alt: 0.040%, the balance being Fe and unavoidable impurities.
In the smelting process of the electric arc furnace, the adding amount of hot charged molten iron accounts for 70% of the total charging amount, the tapping temperature is 1680 ℃, preliminary alloying is carried out during tapping, argon stirring is simultaneously carried out, the flow of two paths of argon is controlled at 600l/min, aluminum is inserted and tapped during electric furnace tapping alloying, and the using amount of aluminum-containing raw materials is 1.6kg/t of molten steel of pure aluminum.
In the LF refining process, the end point S is controlled to be below 0.006 percent, the white slag is kept for 45min, calcium treatment is carried out 5min before vacuum after refining is finished, and the calcium feeding amount is converted into pure calcium amount which is controlled to be 0.05kg/t per ton of steel.
In the VD vacuum refining process, the process control vacuum degree is less than or equal to 1 mbar and is kept for more than or equal to 18min, argon is used as stirring gas, the two paths of bottom stirring argon flow are controlled to be 150l/min, the nitrogen content is measured after the vacuum treatment is finished, the nitrogen content is required to be less than or equal to 35ppm, aluminum components are adjusted by feeding aluminum wires in sequence after the vacuum is broken, the ferrotitanium core-spun wires are fed for 180m after the aluminum wires are fed for more than or equal to 2min, ferrotitanium core-spun wires are fed for 0.16kg/t steel after the ferrotitanium core-spun wires are fed for more than or equal to 5min, sulfur wires are fed for 160m after the ferroboron is fed for more than or equal to 5min, then sampling is carried out, the.
The blank produced by the smelting process of the embodiment enables the qualification rate of the surface flaw detection of the rolled material to be improved to more than 85 percent from about 75 percent, improves the yield and reduces the production cost; the yield of the boron element is improved to 75-80% from the previous 45-50% by purposefully controlling the adding sequence of each alloy and optimizing the addition of the titanium element.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.

Claims (4)

1. A smelting process of boron-containing steel for engineering machinery comprises the following steps: scrap steel and hot-charged molten iron → electric arc furnace smelting → LF refining → VD vacuum refining → continuous casting to form a blank; the method is characterized in that:
the boron-containing steel for engineering machinery comprises the following chemical components in percentage by mass: c: 0.32-0.36%, Mn: 0.90-1.20%, P: less than or equal to 0.025%, S: 0.015 to 0.030%, Si: 0.15-0.35%, Cr: 0.05 to 0.25%, Ni: 0.02-0.20%, Cu: 0.02 to 0.20%, Mo: 0.01-0.08%, B: 0.0010-0.0025%, Alt: 0.020-0.040%, and the balance of Fe and inevitable impurities;
in the smelting process of the electric arc furnace, the adding amount of hot charging molten iron is controlled to be 50-70% of the total charging amount, the tapping temperature is 1640-;
in the LF refining process, the end point S is controlled to be below 0.006 percent, the white slag is kept for 20-45min, calcium treatment is carried out 5min before vacuum after refining is finished, and the calcium feeding amount is converted into pure calcium amount which is controlled to be 0.04-0.05kg/t per ton of steel;
in the VD vacuum refining process, the process control vacuum degree is less than or equal to 1 mbar and is kept for more than or equal to 18min, argon is used as stirring gas, the flow rates of two paths of bottom stirring argon are respectively controlled at 100 plus materials and 150l/min, the nitrogen content is measured after the vacuum treatment is finished, the nitrogen content is required to be less than or equal to 35ppm, aluminum wires are sequentially fed after the vacuum is broken to adjust the aluminum components, ferrotitanium core wires 140 plus materials and 180m are fed after the ferrotitanium core wires are fed for more than or equal to 2min, ferrotitanium core wires are fed for more than or equal to 5min, ferroboron 0.14-0.16kg/t steel is added, ferroboron is fed for more than or equal to 5min, sulfur wires 140 plus materials and 160m are fed after the ferroboron is added for more than or equal to 5min, then the samples.
2. The process for smelting steel for boron-containing engineering machinery according to claim 1, wherein: the boron-containing steel for engineering machinery comprises the following chemical components in percentage by mass: c: 0.32%, Mn: 0.90%, P: 0.025%, S: 0.015%, Si: 0.15%, Cr: 0.05%, Ni: 0.02%, Cu: 0.02%, Mo: 0.01%, B: 0.0010%, Alt: 0.020%, and the balance of Fe and inevitable impurities;
in the smelting process of the electric arc furnace, the adding amount of hot charging molten iron is controlled to account for 50% of the total charging amount, the tapping temperature is 1640 ℃, preliminary alloying is carried out during tapping, argon is used for stirring simultaneously, the flow rates of two paths of argon are respectively controlled at 500l/min, aluminum is inserted and tapped during the alloying of the tapping of the electric furnace, and the using amount of aluminum-containing raw materials is 1.4kg/t of molten steel of pure aluminum;
in the LF refining process, the end point S is controlled to be below 0.006 percent, white slag is kept for 20min, calcium treatment is carried out 5min before vacuum after refining is finished, and the calcium feeding amount is converted into pure calcium amount which is controlled to be 0.04kg/t per ton of steel;
in the VD vacuum refining process, the process control vacuum degree is less than or equal to 1 mbar and is kept for more than or equal to 18min, argon is used as stirring gas, the flow rates of two paths of bottom stirring argon are respectively controlled at 100l/min, the nitrogen content is measured after the vacuum treatment is finished, the nitrogen content is required to be less than or equal to 35ppm, aluminum wires are fed in sequence to adjust the aluminum components after the vacuum is broken, ferrotitanium core-spun yarns are fed in 140m after the aluminum wires are fed with static stirring for more than or equal to 2min, ferrotitanium core-spun yarns are fed in with ferroboron of 0.14kg/t steel after the ferroboron is fed in for more than or equal to 5min, sulfur wires are fed in 140m after the ferroboron is fed in more than or equal to 5min, then the full components.
3. The process for smelting steel for boron-containing engineering machinery according to claim 1, wherein: the boron-containing steel for engineering machinery comprises the following chemical components in percentage by mass: c: 0.34%, Mn: 0.98%, P: 0.005%, S: 0.020%, Si: 0.25%, Cr: 0.15%, Ni: 0.09%, Cu: 0.12%, Mo: 0.05%, B: 0.0020%, Alt: 0.030%, the balance being Fe and unavoidable impurities;
in the smelting process of the electric arc furnace, the adding amount of hot charging molten iron is controlled to account for 60% of the total charging amount, the tapping temperature is 1660 ℃, preliminary alloying is carried out during tapping, argon gas is used for stirring simultaneously, the flow rates of two paths of argon gas are respectively controlled to be 550l/min, aluminum is inserted for tapping during electric furnace tapping alloying, and the using amount of aluminum-containing raw materials is 1.5kg/t molten steel of pure aluminum;
in the LF refining process, the end point S is controlled to be below 0.006 percent, the white slag is kept for 35min, calcium treatment is carried out 5min before vacuum after refining is finished, and the calcium feeding amount is converted into pure calcium amount which is controlled to be 0.045kg/t per ton of steel;
in the VD vacuum refining process, the process control vacuum degree is less than or equal to 1 mbar and is kept for more than or equal to 18min, argon is used as stirring gas, the flow rates of two paths of bottom stirring argon are respectively controlled at 130l/min, the nitrogen content is measured after the vacuum treatment is finished, the nitrogen content is required to be less than or equal to 35ppm, aluminum wires are fed in sequence to adjust the aluminum components after the vacuum is broken, ferrotitanium core-spun yarns are fed in 160m after the aluminum wires are fed with static stirring for more than or equal to 2min, ferrotitanium core-spun yarns are fed in with ferroboron 0.15kg/t steel after the ferroboron core-spun yarns are fed in static stirring for more than or equal to 5min, sulfur wires are fed in 150m after the ferroboron core-spun yarns are fed in static stirring for.
4. The process for smelting steel for boron-containing engineering machinery according to claim 1, wherein: the boron-containing steel for engineering machinery comprises the following chemical components in percentage by mass: c: 0.36%, Mn: 1.20%, P: 0.015%, S: 0.030%, Si: 0.35%, Cr: 0.25%, Ni: 0.20%, Cu: 0.20%, Mo: 0.08%, B: 0.0025%, Alt: 0.040%, the balance being Fe and unavoidable impurities;
in the smelting process of the electric arc furnace, the adding amount of hot charged molten iron is controlled to account for 70% of the total charging amount, the tapping temperature is 1680 ℃, preliminary alloying is carried out during tapping, argon gas is used for stirring simultaneously, the flow rates of two paths of argon gas are respectively controlled to be 600l/min, aluminum is inserted for tapping during electric furnace tapping alloying, and the using amount of aluminum-containing raw materials is 1.6kg/t of molten steel of pure aluminum;
in the LF refining process, the end point S is controlled to be below 0.006 percent, the white slag is kept for 45min, calcium treatment is carried out 5min before vacuum after refining is finished, and the calcium feeding amount is converted into pure calcium amount which is controlled to be 0.05kg/t per ton of steel;
in the VD vacuum refining process, the process control vacuum degree is less than or equal to 1 mbar and is kept for more than or equal to 18min, argon is used as stirring gas, the flow rates of two paths of bottom stirring argon are respectively controlled at 150l/min, the nitrogen content is measured after the vacuum treatment is finished, the nitrogen content is required to be less than or equal to 35ppm, aluminum wires are fed in sequence to adjust the aluminum components after the vacuum is broken, the ferrotitanium cored wires are fed in 180m after the static stirring is more than or equal to 2min, ferrotitanium cored wires are fed in 0.16kg/t steel after the static stirring is more than or equal to 5min, ferroboron is fed in 160m after the ferroboron is fed in more than or equal to 5min, then the full components are sampled and analyzed, and continuous casting is carried out on a ladle after.
CN201811295218.9A 2018-11-01 2018-11-01 Smelting process of boron-containing steel for engineering machinery Active CN109355582B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006203216A (en) * 2006-01-31 2006-08-03 Aichi Steel Works Ltd Anisotropic rare-earth magnet powder and magnetically anisotropic bonded magnet
CN101812643A (en) * 2009-11-30 2010-08-25 莱芜钢铁股份有限公司 Boracic pinion steel and preparation method thereof
CN105458200A (en) * 2015-11-27 2016-04-06 山东钢铁股份有限公司 Method for reducing surface cracks of boron containing steel continuous casting sheet billet

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006203216A (en) * 2006-01-31 2006-08-03 Aichi Steel Works Ltd Anisotropic rare-earth magnet powder and magnetically anisotropic bonded magnet
CN101812643A (en) * 2009-11-30 2010-08-25 莱芜钢铁股份有限公司 Boracic pinion steel and preparation method thereof
CN105458200A (en) * 2015-11-27 2016-04-06 山东钢铁股份有限公司 Method for reducing surface cracks of boron containing steel continuous casting sheet billet

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