CN103627971A - Alloy structural steel for large-specification soldering tools and smelting method thereof - Google Patents

Alloy structural steel for large-specification soldering tools and smelting method thereof Download PDF

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Publication number
CN103627971A
CN103627971A CN201310694700.0A CN201310694700A CN103627971A CN 103627971 A CN103627971 A CN 103627971A CN 201310694700 A CN201310694700 A CN 201310694700A CN 103627971 A CN103627971 A CN 103627971A
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steel
composition
drilling tool
slag
temperature
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CN103627971B (en
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王国存
陈列
寇玉山
李硕
范金城
胡发贵
李海严
蔡宝润
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XINING SPECIAL STEEL CO Ltd
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XINING SPECIAL STEEL CO Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The invention discloses alloy structural steel for large-specification soldering tools. The alloy structural steel is characterized by comprising the following chemical components in percentage by weight: 0.23-0.26% of C, 1.30-1.65% of Si, 1.10-1.40% of Mn, 0.40-0.60% of Cr, 1.70-1.90% of Ni, 0.50-0.70% of Mo, 0.15-0.25% of V, not more than 0.020% of P, not more than 0.015% of S, not more than 0.20% of Cu and the balance of Fe; and the mechanical properties of the alloy structural steel are as follows: Rm is not less than 1600MPa, Rel is not less than 1300MPa, A is not less than 11.5%, Z is not less than 45% and AKU2 is not less than 85J. The alloy structural steel disclosed by the invention has the beneficial effects that the new alloy structural steel with more excellent mechanical properties in comparison with existing high-quality steel FF710, 23CrNi3MoA, XGQ25 and the like for the soldering tools is provided by designing new chemical components, the Rm is not less than 1600MPa, the Rel is not less than 1300MPa, the A is not less than 11.5%, the Z is not less than 45%, the AKU2 is not less than 85J, and the alloy structural steel has good quenching degree and hardenability, and can completely meet the using requirements of large-specification soldering tool (phi 550mm) products.

Description

Large specification drilling tool structural alloy steel and smelting process thereof
Technical field
The present invention relates to a kind of steel and smelting process thereof, be specifically related to a kind of large specification drilling tool structural alloy steel and smelting process thereof, belong to metal material field.
Background technology
Along with the continuous prosperity of national economy, drive the foundation of national economy construction such as domestic mine excavation, urban construction, harbour, highway, railway comprehensively fast-developing, the drilling tool industry of the what is called that matches with it " tooth of industry " also obtains great development.
At present, drilling tool manufacture view, domestic common employing be that the drilling tool manufactured materials FF710 that produces of Swedish method Gus tower company and hophornbeam are agree the XGQ25 that 23CrNi3MoA steel that company uses and Xining special steel are produced, table 1, chemical composition that table 2 is these steel and the contrast situation of mechanical property.
Table 1 chemical composition contrast table (unit: Wt%)
Table 2 mechanical property contrast table
FF710 is relatively applicable to the manufacture of small dimension drilling tool;
Although 23CrNi3MoA steel is applicable to manufacture large specification drilling tool, the intensity of steel, toughness, hardening capacity and hardenability and all lower after air quenching, and alloy content is expensive higher;
XGQ25 is relatively applicable to manufacture large specification drilling tool, and after air quenching, the intensity of steel is better compared with the above two, and hardening capacity and hardenability aspect also slightly well, are still having gap with large specification drilling tool demand aspect intensity, impelling strength on the whole.
Development along with drilling tool industry, the manufacture of large specification, high-quality drilling tool has been proposed to the requirement of upgrading, drilling tool product specification continues to increase, the interior quality of material: the aspects such as intensity, toughness, processing characteristics, energy-conserving and environment-protective have proposed new requirement, and original material is without meeting this new variation and new demand.
Summary of the invention
For solving the deficiencies in the prior art, the object of the present invention is to provide a kind of tensile strength higher, under air quenching, there is good hardening capacity and hardenability, can meet the structural alloy steel of the service requirements of large specification drilling tool product completely, and the smelting process of this structural alloy steel.
In order to realize above-mentioned target, the present invention adopts following technical scheme:
A large specification drilling tool structural alloy steel, is characterized in that, chemical composition is by percentage to the quality:
Aforesaid large specification drilling tool structural alloy steel, is characterized in that, the mechanical property of structural alloy steel is as follows:
A smelting process for structural alloy steel for large specification drilling tool, is characterized in that, comprises the following steps:
One, electric furnace redox:
(1) be oxidized the requirement of last terminal composition: C >=0.06%, P≤0.010%; Steel per ton adds ferromanganese 2.5-3.5kg, does manganese boiling; Slagging-off temperature is greater than 1630 ℃, takes off the quantity of slag >=95%;
(2) quantity of slag 12-15Kg/t steel, lime 9kg-12Kg/t steel, fluorite 1.5kg-3.0Kg/t steel, aluminium is pressed 2kg-2.5Kg fine aluminium/t steel, is pressed into the requirement of LF composition and adds ferrochrome, ferrosilicon or silicomanganese, molybdenum-iron, nickel plate alloy to carry out alloying;
(3) first recovery time 10-25min;
(4) composition is suitable, temperature >=1630 ℃ tapping;
Two, refining:
(1) enter LF molten steel temperature >=1540 ℃, logical argon gas, gives electrically heated >=10min;
(2) according to kind composition, require to add diffusion deoxidizer SiC powder;
(3) refining slag target component: CaO:50%-55%, SiO 2: 10%-15%, MgO:3%-6%, Al 2o 3: 15%-20%, aluminium 0.040%-0.050%;
(4) composition meets the requirements, and 1650 ℃-1660 ℃ of temperature, enter VD station, vapor pressure 0.85-1.2Mpa;
(5) vacuumize vacuum breaker after maintenance >=15min under vacuum tightness 0.5 torr;
(6) after vacuum breaker, carry out weak argon and stir, top of the slag fluctuation 50-100mm, time >=15min, bull ladle temperature: 1555 ℃-1565 ℃;
Three, casting:
Pouring temperature: 1550 ℃ ± 5 ℃;
Four, esr:
Electroslag remelting slag adopts quaternary slag, evenly adds reductor aluminium powder in batches;
Five, ingot annealing:
First heat up and be incubated, be incubated 6h while being heated to 690 ± 10 ℃, last stove is chilled to 550 ℃ and comes out of the stove.
The smelting process of structural alloy steel for aforesaid large specification drilling tool, is characterized in that, in step 2, the addition of diffusion deoxidizer SiC powder is 0.8kg-2.0kg/t steel.
The smelting process of structural alloy steel for aforesaid large specification drilling tool, is characterized in that, in step 2, in vacuum, argon pressure is adjusted: argon pressure 0.2-0.3Mpa during black vacuum, argon pressure 0.25-0.45Mpa during utmost point vacuum.
The smelting process of structural alloy steel for aforesaid large specification drilling tool, is characterized in that, in step 5, and heat-up rate≤100 ℃/h.
Usefulness of the present invention is: by the design of new chemical composition, provide a kind of than more superior new structural alloy steels of mechanical property such as existing high-quality drilling tool steel FF710,23CrNi3MoA, XGQ25, its Rm >=1600Mpa, Rel >=1300MPa, A >=11.5%, Z >=45%, AKU2 >=85J, under air quenching, there is good hardening capacity and hardenability, can meet the service requirements of large specification drilling tool (φ 550mm) product completely.
Embodiment
Below in conjunction with specific embodiment, the present invention is done to concrete introduction.
Embodiment 1
One, batching
Furnace charge by our factory return, this steel grade returns, the pig iron forms; Mixed carbon comtent requires 1.2-1.5%.
Two, electric furnace oxidation
According to slag condition, adjust lime, fluorite, light dolomite consumption, slag charge overall control 40-50Kg/t.
Temperature >=1580 ℃ after fine melt, start oxidation; Oxygen blast pressure-controlling is at 0.5-0.7MPa; Decarburized amount >=0.40%, process adds iron ore in batches, and overall control is at 7-10Kg/t.
Be oxidized last terminal composition and content: meet C >=0.06% requirement, meet the requirement of P≤0.010%; Steel per ton adds ferromanganese 2.5-3.5kg, does manganese boiling; Slagging-off temperature is greater than 1630 ℃ (idols), takes off the quantity of slag >=95%.
Three, electric furnace just reduces
Quantity of slag 12-15Kg/t steel, lime 9kg-12Kg/t steel, fluorite 1.5kg-3.0Kg/t steel, aluminium (steel shot aluminum or ferro-aluminum) is pressed 2kg-2.5Kg fine aluminium/t steel, be pressed into the requirement of LF composition and add ferrochrome, ferrosilicon or silicomanganese, molybdenum-iron, nickel plate alloy to carry out alloying, and sampling analysis.
Electric furnace steel tapping regulation: composition is suitable, temperature >=1630 ℃ tapping; Tap and by 1.0Kg fine aluminium/t steel, add steel shot aluminum or ferro-aluminum at 1/3 o'clock.
Tap: 27 ± 2 tons of furnace shells early stage (within 40 fire are inferior); The furnace shell middle and later periods: (more than 40 fire are inferior) 30 ± 2 tons.
Electric furnace steel tapping time 180s-300s.
Get large ladle analysis composition.
Four, refining
Enter LF molten steel temperature >=1540 ℃, logical argon gas (pressure-controlling is at 0.2-0.4MPa), gives electrically heated >=10min.According to kind composition, require to add diffusion deoxidizer SiC powder; Addition is that steel per ton adds 0.8kg-2.0kg.
Refining slag target component: CaO:50%-55%, SiO 2: 10%-15%, MgO:3%-6%, Al 2o 3: 15%-20%.
According to the analytical results of large ladle sample, by internal control composition requirement adjusting component, aluminium component is adjusted to 0.040%-0.050% (electrode base Al is adjusted to 0.055%-0.065%).
Heat temperature raising, sampling analysis composition, according to composition result, by internal control composition requirement fine setting composition; Composition meets the requirements, and 1650 ℃-1660 ℃ of temperature, enter VD station, and Steam pressure control is at 0.85-1.2Mpa.
Vacuumize, under vacuum tightness 0.5 torr, vacuum breaker after maintenance >=15min, adjusts argon pressure in vacuum: during black vacuum, argon pressure is controlled at 0.2-0.3Mpa, and during utmost point vacuum, argon pressure is controlled at 0.25-0.45Mpa.
After vacuum breaker, according to temperature conditions, carry out weak argon and stir, top of the slag fluctuation 50-100mm, time >=15min.Bull ladle temperature: 1555 ℃-1565 ℃.
Five, casting
Pouring temperature: 1550 ℃ ± 5 ℃, the ingot body time of different ingot shapes, cap mouth time, different with mould cooling time, hole cool time and annealing way, concrete processing parameter is referring to table 3.
Table 3 casting process parameter list
Six, esr
Check and accept cleaning: every stove electrode blank is done full composition and reviewed analysis, and result meets the requirement of corresponding electric furnace internal control composition; Electrode base is cleared up, and quality meets Q/XGBC03-2007 requirement.
Slag system: electroslag remelting slag adopts quaternary slag.
Process control: according to electrode base composition and finished product requirement, determine the consumption of reductor (aluminium powder), reductor evenly adds in batches; The strict ingot shape of pressing is controlled molten speed, electric power system and coolant water temperature (45 ± 5 ℃).
Feeding: press ingot shape and control the steel ingot feeding time, prevent that shrinkage cavity from crossing condition with deep feeling.
Different ingot shapes, its corresponding quantity of slag, electric power system (normally smelting), the ingot method of double differences, de-ingot time and annealing way tool are different, specifically in Table 4.
Table 4 esr parameter list
Steel ingot is through clearage with grinding wheel, and surface quality meets Q/XGBC02-2007 requirement; Thief hole is carried out obvious sign.
Seven, ingot annealing
First heat up and be incubated, heat-up rate≤100 ℃/h, is incubated 6h while being heated to 690 ± 10 ℃, and last stove is chilled to 550 ℃ and comes out of the stove.
Eight, product performance are measured, in Table 5.
Table 5 mechanical property
Embodiment 2
One, batching
Furnace charge is by CrNiMo(CrNi2Mo, CrMo, CrNi) return, steel per ton adds spent cathodes piece 2.5kg-3.5kg.Iron alloy is through baking, the dehydrogenation of nickel plate.
Two, electric furnace oxidation
According to slag condition, adjust lime, fluorite, light dolomite consumption, slag charge overall control 30-40Kg/t.
Temperature >=1580 ℃ after fine melt, start oxidation; Oxygen blast pressure-controlling is at 0.5-0.7MPa; Decarburized amount >=0.20%.
Be oxidized last terminal composition and content: meet C >=0.06% requirement, meet the requirement of P≤0.010%; Steel per ton adds ferromanganese 2.5kg-3.5kg, does manganese boiling; Slagging-off temperature is greater than 1630 ℃ (idols), takes off the quantity of slag >=95%.
Three, electric furnace just reduces
Quantity of slag 12-15Kg/t steel, lime 9kg-12Kg/t steel, fluorite 1.5kg-3.0Kg/t steel, aluminium (steel shot aluminum or ferro-aluminum) is pressed 2kg-2.5Kg fine aluminium/t steel, be pressed into the requirement of LF composition and add ferrochrome, ferrosilicon or silicomanganese, molybdenum-iron, nickel plate alloy to carry out alloying, and sampling analysis.
Electric furnace steel tapping regulation: composition is suitable, temperature >=1630 ℃ tapping; Tap and by 1.0Kg fine aluminium/t steel, add steel shot aluminum or ferro-aluminum at 1/3 o'clock.
Tap: 27 ± 2 tons of furnace shells early stage (within 40 fire are inferior); The furnace shell middle and later periods: (more than 40 fire are inferior) 30 ± 2 tons.
Electric furnace steel tapping time 180s-300s.
Get large ladle analysis composition.
Four, refining
Enter LF molten steel temperature >=1540 ℃, logical argon gas (pressure-controlling is at 0.2-0.4MPa), gives electrically heated >=10min.According to kind composition, require to add diffusion deoxidizer SiC powder; Addition is that steel per ton adds 0.8kg-2.0kg.
Refining slag target component: CaO:50%-55%, SiO 2: 10%-15%, MgO:3%-6%, Al 2o 3: 15%-20%.
According to the analytical results of large ladle sample, by internal control composition requirement adjusting component, aluminium component is adjusted to 0.040%-0.050% (electrode base Al is adjusted to 0.055%-0.065%).
Heat temperature raising, sampling analysis composition, according to composition result, by internal control composition requirement fine setting composition; Composition meets the requirements, and 1650 ℃-1660 ℃ of temperature, enter VD station, vapor pressure 0.85-1.2Mpa.
Vacuumize, under vacuum tightness 0.5 torr, vacuum breaker after maintenance >=15min, adjusts argon pressure in vacuum: during black vacuum, argon pressure is controlled at 0.2-0.3Mpa, and during utmost point vacuum, argon pressure is controlled at 0.25-0.45Mpa.
After vacuum breaker, according to temperature conditions, carry out weak argon and stir, top of the slag fluctuation 50-100mm, time >=15min.Bull ladle temperature: 1555 ℃-1565 ℃.
Five, casting
Pouring temperature: 1550 ℃ ± 5 ℃, the ingot body time of different ingot shapes, cap mouth time, different with mould cooling time, hole cool time and annealing way, concrete processing parameter is referring to table 6.
Table 6 casting process parameter list
Six, esr
Check and accept cleaning: every stove electrode blank is done full composition and reviewed analysis, and result meets the requirement of corresponding electric furnace internal control composition; Electrode base is cleared up, and quality meets Q/XGBC03-2007 requirement.
Slag system: electroslag remelting slag adopts quaternary slag.
Process control: according to electrode base composition and finished product requirement, determine the consumption of reductor (aluminium powder), reductor evenly adds in batches; The strict ingot shape of pressing is controlled molten speed, electric power system and coolant water temperature (45 ± 5 ℃).
Feeding: press ingot shape and control the steel ingot feeding time, prevent that shrinkage cavity from crossing condition with deep feeling.
Different ingot shapes, its corresponding quantity of slag, electric power system (normally smelting), the ingot method of double differences, de-ingot time and annealing way tool are different, specifically in Table 7.
Table 7 esr parameter list
Steel ingot is through clearage with grinding wheel, and surface quality meets Q/XGBC02-2007 requirement; Thief hole is carried out obvious sign.
Seven, ingot annealing
First heat up and be incubated, heat-up rate≤100 ℃/h, is incubated 6h while being heated to 690 ± 10 ℃, and last stove is chilled to 550 ℃ and comes out of the stove.
Eight, product performance are measured, in Table 8.
Table 8 mechanical property
As can be seen here, large specification drilling tool of the present invention is more more superior than mechanical properties such as existing high-quality drilling tool steel FF710,23CrNi3MoA, XGQ25 with structural alloy steel, its Rm >=1600Mpa, Rel >=1300MPa, A >=11.5%, Z >=45%, AKU2 >=85J, under air quenching, there is good hardening capacity and hardenability, can meet the service requirements of large specification drilling tool (φ 550mm) product completely.
To sum up aforementioned, the good affinity that structural alloy steel of the present invention has good welding property, the coefficient of expansion close with Wimet and copper base or money base are disclosed, there is good processing characteristics, after thermal treatment air quenching and low-temperaturetempering, there is good intensity, be applicable to manufacturing large quality drilling tool with a high standard, the simple environmental protection and energy saving of thermal treatment process with coordinating of plasticity toughness.
The large specification drilling tool that adopts structural alloy steel of the present invention to produce, can after carburizing treatment, suitably heat-treat, thereby can realize the transition of organizing of large specification drilling tool top layer, zone of transition and matrix, guarantee the use properties of large specification drilling tool, and can effectively extend the work-ing life of finished product drilling tool.
It should be noted that, above-described embodiment does not limit the present invention in any form, and all employings are equal to replaces or technical scheme that the mode of equivalent transformation obtains, all drops in protection scope of the present invention.

Claims (6)

1. large specification drilling tool structural alloy steel, is characterized in that, chemical composition is by percentage to the quality:
2. large specification drilling tool structural alloy steel according to claim 1, is characterized in that, the mechanical property of structural alloy steel is as follows:
3. the smelting process of structural alloy steel for large specification drilling tool, is characterized in that, comprises the following steps:
One, electric furnace redox:
(1) be oxidized the requirement of last terminal composition: C >=0.06%, P≤0.010%; Steel per ton adds ferromanganese 2.5-3.5kg, does manganese boiling; Slagging-off temperature is greater than 1630 ℃, takes off the quantity of slag >=95%;
(2) quantity of slag 12-15Kg/t steel, lime 9kg-12Kg/t steel, fluorite 1.5kg-3.0Kg/t steel, aluminium is pressed 2kg-2.5Kg fine aluminium/t steel, is pressed into the requirement of LF composition and adds ferrochrome, ferrosilicon or silicomanganese, molybdenum-iron, nickel plate alloy to carry out alloying;
(3) first recovery time 10-25min;
(4) composition is suitable, temperature >=1630 ℃ tapping;
Two, refining:
(1) enter LF molten steel temperature >=1540 ℃, logical argon gas, gives electrically heated >=10min;
(2) according to kind composition, require to add diffusion deoxidizer SiC powder;
(3) refining slag target component: CaO:50%-55%, SiO 2: 10%-15%, MgO:3%-6%, Al 2o 3: 15%-20%, aluminium 0.040%-0.050%;
(4) composition meets the requirements, and 1650 ℃-1660 ℃ of temperature, enter VD station, vapor pressure 0.85-1.2Mpa;
(5) vacuumize vacuum breaker after maintenance >=15min under vacuum tightness 0.5 torr;
(6) after vacuum breaker, carry out weak argon and stir, top of the slag fluctuation 50-100mm, time >=15min, bull ladle temperature: 1555 ℃-1565 ℃;
Three, casting:
Pouring temperature: 1550 ℃ ± 5 ℃;
Four, esr:
Electroslag remelting slag adopts quaternary slag, evenly adds reductor aluminium powder in batches;
Five, ingot annealing:
First heat up and be incubated, be incubated 6h while being heated to 690 ± 10 ℃, last stove is chilled to 550 ℃ and comes out of the stove.
4. the smelting process of structural alloy steel for large specification drilling tool according to claim 3, is characterized in that, in step 2, the addition of diffusion deoxidizer SiC powder is 0.8kg-2.0kg/t steel.
5. the smelting process of structural alloy steel for large specification drilling tool according to claim 3, it is characterized in that, in step 2, in vacuum, argon pressure is adjusted: argon pressure 0.2-0.3Mpa during black vacuum, argon pressure 0.25-0.45Mpa during utmost point vacuum.
6. the smelting process of structural alloy steel for large specification drilling tool according to claim 3, is characterized in that, in step 5, and heat-up rate≤100 ℃/h.
CN201310694700.0A 2013-12-17 2013-12-17 Large gauge drilling tool structural alloy steel and smelting process thereof Expired - Fee Related CN103627971B (en)

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Cited By (7)

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CN104264042A (en) * 2014-09-30 2015-01-07 衡阳华菱钢管有限公司 Method for smelting cryogenic 9 Ni steel by electric furnace oxidation
CN104975217A (en) * 2015-06-30 2015-10-14 本钢板材股份有限公司 Production method of steel 42CrMo4+HH used for fuel gas electric generator connecting rods
CN105714125A (en) * 2016-03-09 2016-06-29 西峡龙成冶金材料有限公司 Electroslag remelting slag and production technology thereof
CN107099767A (en) * 2017-06-05 2017-08-29 长沙天和钻具机械有限公司 A kind of explosion drill bit Technology for Heating Processing
CN107974629A (en) * 2017-11-27 2018-05-01 长沙黑金刚实业有限公司 A kind of drilling tool steel, its preparation method and drilling tool
CN108546880A (en) * 2018-05-15 2018-09-18 本钢板材股份有限公司 Steel BG22SiMnNi2CrMoA and preparation method thereof
CN109852881A (en) * 2019-02-21 2019-06-07 本钢板材股份有限公司 A kind of 45CrNiMoVA drilling tool steel and its production method

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CN1410581A (en) * 2001-10-01 2003-04-16 住友金属工业株式会社 Steel for mechanical structure and mfg. method thereof
JP2007023310A (en) * 2005-07-12 2007-02-01 Kobe Steel Ltd Steel for machine structural use
CN101082101A (en) * 2006-05-29 2007-12-05 宝山钢铁股份有限公司 Chromic-nickel-free high-strength high ductility structural steel and manufacturing method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1950004A1 (en) * 1969-10-03 1971-04-22 Suedwestfalen Ag Stahlwerke Process to achieve components with high fatigue strength
CN1410581A (en) * 2001-10-01 2003-04-16 住友金属工业株式会社 Steel for mechanical structure and mfg. method thereof
JP2007023310A (en) * 2005-07-12 2007-02-01 Kobe Steel Ltd Steel for machine structural use
CN101082101A (en) * 2006-05-29 2007-12-05 宝山钢铁股份有限公司 Chromic-nickel-free high-strength high ductility structural steel and manufacturing method thereof

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104264042A (en) * 2014-09-30 2015-01-07 衡阳华菱钢管有限公司 Method for smelting cryogenic 9 Ni steel by electric furnace oxidation
CN104975217A (en) * 2015-06-30 2015-10-14 本钢板材股份有限公司 Production method of steel 42CrMo4+HH used for fuel gas electric generator connecting rods
CN105714125A (en) * 2016-03-09 2016-06-29 西峡龙成冶金材料有限公司 Electroslag remelting slag and production technology thereof
CN107099767A (en) * 2017-06-05 2017-08-29 长沙天和钻具机械有限公司 A kind of explosion drill bit Technology for Heating Processing
CN107099767B (en) * 2017-06-05 2019-05-17 长沙天和钻具机械有限公司 A kind of explosion drill bit heat treatment process
CN107974629A (en) * 2017-11-27 2018-05-01 长沙黑金刚实业有限公司 A kind of drilling tool steel, its preparation method and drilling tool
CN108546880A (en) * 2018-05-15 2018-09-18 本钢板材股份有限公司 Steel BG22SiMnNi2CrMoA and preparation method thereof
CN109852881A (en) * 2019-02-21 2019-06-07 本钢板材股份有限公司 A kind of 45CrNiMoVA drilling tool steel and its production method
CN109852881B (en) * 2019-02-21 2020-12-01 本钢板材股份有限公司 Steel for 45CrNiMoVA drill tool and production method thereof

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