CN106947908A - A kind of method that continuous casting electroslag produces 4Cr5MoSiV1 die steels - Google Patents
A kind of method that continuous casting electroslag produces 4Cr5MoSiV1 die steels Download PDFInfo
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- CN106947908A CN106947908A CN201710164615.1A CN201710164615A CN106947908A CN 106947908 A CN106947908 A CN 106947908A CN 201710164615 A CN201710164615 A CN 201710164615A CN 106947908 A CN106947908 A CN 106947908A
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention belongs to steel grade production method technical field, a kind of method that continuous casting electroslag produces 4Cr5MoSiV1 die steels is specifically provided, is comprised the following steps：Molten steel composition in square billet, electroslag remelting, heating rolling, annealing in electric arc furnace smelting molten steel, ladle refining furnace refined molten steel, vacuum degassing furnace refined molten steel, continuous casting 235mm × 265mm, the step controls as C by mass percentage：0.37~0.43%, Mn：0.30~0.50%, Si：0.90~1.20%, P：＜ 0.025%, S：0.010%th, Cr：4.80~5.50%, Mo：1.20~1.50%, V：0.90~1.10%, Cu：＜ 0.25%, Ni：＜ 0.25%, surplus is iron and inevitable impurity.The present invention uses square billet+electroslag remelting in continuous casting+to roll for forging process, manufacture production 4Cr5MoSiV1 die steels, both every comprehensive mechanical property of 4Cr5MoSiV1 die steels had been ensure that, the lumber recovery of 4Cr5MoSiV1 die steels is improved again, so as to reduce production cost and improving production efficiency.
Description
Technical field
The invention belongs to steel grade production method technical field, a kind of continuous casting electroslag production 4Cr5MoSiV1 moulds are specifically provided
The method of tool steel.
Background technology
Die steel is the important materials in mould processing manufacturing industry, its directly affect mould processing, die quality and
Product quality.Have good production efficiency height, quality, saving material and cost low a series of excellent with mould machine-shaping part
Point, application is extremely extensive.Hot die steel is the important mold materials of a class, when due to hot-work die being long at high temperature
Between work, with the extension of active time, its tissue will change, performance also can correspondingly change, therefore, and this is just
It is required that hot die steel has good obdurability, cold-heat fatigue property and high high-temp stability etc..
4Cr5MoSiV1 is equivalent in SKD61, ISO in 1.2344, JIS standards in H13, DIN standard in ASTM
The trades mark such as 40CrMoV5, are that can be not only used for hot forged mould, and hot-extrusion mold is can be used for again, the middle conjunction of die casting is can be also used for
Golden hot die steel.Wherein 4Cr5MoSiV1 steel is obtained as the typical steel grade of die steel in mould processing manufacturing industry
Develop considerablely and widely apply.4Cr5MoSiV1 steel is the middle carbon alloy hot die steel in a kind of 5%Cr systems, and it is big
Amount ground is applied to hot forged mould manufacture field.The 4Cr5MoSiV1 steel has excellent toughness and good cold-heat fatigue property,
It is essentially identical with mechanical performance at room temperature under 600 DEG C of conditions of work, and it is 600 DEG C to be suitable for manufacture operating temperature, right
Toughness and plasticity all have the mould of high requirement.4Cr5MoSiV1 is developed by the U.S. in the second half in previous generation earliest, due to its tool
There is very excellent quenching degree, and the features such as good toughness, wearability are high, thermal fatigue resistance is good, in hot die steel,
The combination property performance of 4Cr5MoSiV1 steel is very prominent, therefore, and it is received rapidly by manufacturer and turns into main flow heat work
Mould steel, and used successively by each developed country of the world.The key property of 4Cr5MoSiV1 steel is：With high quenching degree and
High toughness；Excellent thermal crack resistant ability, with medium wear resistance, the deformation of heat treatment is small, and medium and high cutting adds
Work, medium anti-decarburization capacity.
Based on above-mentioned steel grade characteristic, all make great efforts to probe into and expand manufacture method both at home and abroad, to obtain with relatively low
Smelting cost, alloying most rational, the 4Cr5MoSiV1 steel with optimal institutional framework and excellent comprehensive performance.At present
The existing production technology of 4Cr5MoSiV1 steel mainly has following 3 kinds：
(1) electric furnace (converter) → external refining → molds → forging → and is heat-treated, and is a kind of mode the most traditional.From 80
Since age, all in this way, it is a kind of more traditional technology pattern to most domestic special steel plant.
(2) electric furnace → external refining → molding → breaking down bar → heat treatment, this production technology uses to roll for forger
Skill make it that energy consumption reduction is more, is also increased while producing recovery rate.
(3) electric furnace → external refining → molding → electroslag remelting → is forged → is heat-treated, such technique typically to
Produce degree of purity and require that higher, consistency, combination property be uniform and the preferable purposes material of degree of segregation, it is also current generation
The production widest technological process of high-quality H13 die steels is generally acknowledged in boundary.
But, all there is more shortcoming in above-mentioned three productions technique.First, steel ingot is produced by die casting process,
The lumber recovery of 4Cr5MoSiV1 die steels is by a definite limitation；Second, 4Cr5MoSiV1 moulds are produced by forging mode
With steel, although can effectively improve inside steel billet tissue, but the production efficiency of forging mode is relatively low, and finished product die is used
The dimensional accuracy of steel is not high；3rd, the high-end purposes product of molding+electroslag remelting steel ingot production, its production cost is higher.
With the swift and violent growth of the industries such as automobile making, device fabrication, 4Cr5MoSiV1 die steels are applied to civilian neck
The market demand in domain is also increased, therefore, it is possible to obtain the 4Cr5MoSiV1 moulds of a kind of high efficiency, high-quality and low cost
Tool steel production technology becomes the direction of the effort for it of associated production enterprise.
The content of the invention
In order to solve the above-mentioned technical problem, the invention provides a kind of continuous casting electroslag production 4Cr5MoSiV1 die steels
Method, uses square billet+electroslag remelting in continuous casting+to roll for forging process, manufacture production 4Cr5MoSiV1 die steels both ensure that
Every comprehensive mechanical property of 4Cr5MoSiV1 die steels, improves the lumber recovery of 4Cr5MoSiV1 die steels again, so that
Reduce production cost and improving production efficiency.
The present invention is achieved in that a kind of method that continuous casting electroslag produces 4Cr5MoSiV1 die steels, including as follows
Step：In electric arc furnace smelting molten steel, ladle refining furnace refined molten steel, vacuum degassing furnace refined molten steel, continuous casting 235mm × 265mm
Molten steel composition in square billet, electroslag remelting, heating rolling, annealing, the step controls as C by mass percentage：0.37~
0.43%th, Mn：0.30~0.50%, Si：0.90~1.20%, P：＜ 0.025%, S：0.010%th, Cr：4.80~5.50%,
Mo：1.20~1.50%, V：0.90~1.10%, Cu：＜ 0.25%, Ni：＜ 0.25%, surplus is iron and inevitably miscellaneous
Matter.
Further, electric furnace smelting molten steel step is using steel scrap hot metal charging as furnace charge, and by mass percentage, steel scrap is accounted for
10~30%, molten iron accounts for 70~90%；With C amounts 1.10~1.30%, dioxygen oxidation, fierceness is seethed with excitement, flows slag, oxidizing temperature automatically
1550~1580 DEG C, decarburization weight 0.25~0.30%, when tapping, C is 0.05~0.25%, P≤0.010%, temperature
1630~1670 DEG C, slag charge, pre-deoxidant, ferroalloy are added during tapping 1/4~1/3.
Further, C powder, FeSi powder 2~4kg/t deoxidiers, every batch is added portionwise in ladle refining furnace refined molten steel step
5~10min of interval time；Continue diffusive deoxidation after complete analysis, keep reducing atmosphere to bull ladle, white slag retention time 20min；It is de-
Control composition lower limit C is pressed after oxygen:0.37%th, Mn：0.30%th, Si：0.90%th, Cr：4.80%th, Mo：1.20%th, V：0.90%,
The ferrochrome, molybdenum-iron, vanadium iron of baking are added, by composition adjustment to target content, i.e. C：0.39%th, Mn：0.40%th, Si：
1.00%th, P：0.015%th, S：0.005%th, Cr：5.05%th, Mo：1.40%th, V：1.00%；Whole-process control argon pressure 0.2~
0.3MPa, prevents that molten steel is exposed and causes secondary oxidation.
Further, in vacuum degassing furnace refined molten steel step, 1630~1660 DEG C of vacuum outgas furnace temperature, vacuum are entered
Reach below 100Pa, 15~25min of retention time；Final deoxidizing after vacuum breaker, feeding CaSi lines 0.5kg/t；Quiet Argon after line feeding
20~30min of time, 0.1~0.3MPa of argon pressure, with top of the slag fine motion, molten steel is not exposed to be defined, and prevents secondary oxidation；Bull ladle
Temperature control is at 1560~1570 DEG C.
Further, it is big to wrap 1565~1575 DEG C of the first furnace temperature, even pour 1545~1555 DEG C in continuous casting step, it is middle
1515~1525 DEG C of bag temperature, 0.80~0.85m/min of pulling rate, secondary cooling water specific water 0.23L/kg, M-EMS electricity
Flow 400A, end electromagnetic agitation electric current 330A, frequency 8Hz；Total process protective is cast, and crystallizer protecting residue is protected using medium carbon steel
Slag；Strand cutting is using automatic plus by the way of being manually combined, and continuous casting billet red steel is rebasing, upper pressure two stove strands guarantee glacing flatness,
30~40h of soaking time.
Further, in electroslag remelting step, 235mm × 265mm continuous casting billets are fabricated to；Crystallizer size is suitable for reading
630mm × lower mouth 660mm × high 1600mm, crystallizer is suitable for reading to be provided with argon gas-sealed circle, and makees following key control point：
1) the slag system quantity of slag：Using binary slag, slag ratio CaF2：Al2O3=70%：30%, the quantity of slag：100kg；
2) setting electric current：12500A；Set voltage：61V；
3) the steel ingot type of cooling：The cold 60min of mould, covers cold 48h.
Further, in heating rolling step, heating is using the heating of corner burner recuperative soaking pit, heating-up temperature 1230
DEG C, 12~14h of soaking time；Roll and use 800 blooming mills, 650 finishing mills, wherein 1050~1080 DEG C of breaking down temperature,
960~1000 DEG C of tandem rolling temperature, reduces mill table cooling water flow, it is to avoid steel ftracture.
Further, in annealing steps, rolling carries out annealing heat-treats after terminating after insulation 12h, controls annealing temperature
For 870 DEG C, annealing insulation 5h is subsequently cooled to 500 DEG C of air coolings of coming out of the stove.
Compared with prior art, it is an advantage of the current invention that being produced using square billet in continuous casting+electroslag remelting process
4Cr5MoSiV1 die steels, have abandoned molding+electro-slag re-melting method used in the prior art, but use side in continuous casting
Base+electroslag remelting+and to roll for forging process production, greatly improve the lumber recovery of high-end 4Cr5MoSiV1 die steels and reduce life
While producing cost, it is ensured that the 4Cr5MoSiV1 die steels obtained are in Composition Control, macrostructure, metallographic structure,
All with using manufactured by existing molding+electroslag remelting process in terms of non-metallic inclusion, microhardness and comprehensive mechanical property
4Cr5MoSiV1 die steels quite, meet the market demand of 4Cr5MoSiV1 die steels.
Compared with prior art production 4Cr5MoSiV1 die steels, square billet+electricity in use continuous casting of the present invention
The advantage that the method for slag remelting processing production 4Cr5MoSiV1 die steels possesses is as follows：
1) every comprehensive mechanical property is excellent；
2) non-metallic inclusion content is low, steel high purity；
3) production technology is implemented simple；
4) rate of steel products produced to steel ingots is high, increases economic efficiency；
5) product quality level is improved.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Embodiment,
The actual production step for manufacturing 4Cr5MoSiV1 die steels using technical scheme is as follows：
1) electric furnace smelting
44.3t molten iron matches somebody with somebody 6t steel scraps；Dioxygen oxidation, fierceness boiling, flows slag automatically, 1578 DEG C of oxidizing temperature, and C is during tapping
0.10%, P are 0.005%, and other residual elements are qualified, 1673 DEG C of temperature, and slag charge 300kg, pre-deoxidant are added during tapping 1/4
Ferro-aluminum 80kg.
2) LF refining
Whole Argon, using active lime 450kg, alumina balls 200kg slag making uses carbon dust, 2~4kg/t of ferrosilicon powder
Powdery deoxidier, every crowd of 5~10min of interval time.White slag is refined, and keeps reducing atmosphere to bull ladle, the white slag retention time is many
In 20min.Deoxidation is well added the alloys such as ferrochrome, molybdenum-iron, the vanadium iron of baking by control composition lower limit afterwards, by composition adjustment to mesh
Mark.Whole-process control 0.2~0.3MPa of argon pressure, prevents that molten steel is exposed and causes secondary oxidation.1665 DEG C of bull ladle temperature.
3) VD vacuum outgas
Enter 1654 DEG C of VD temperature, vacuum reaches below 100Pa, retention time 15min.Final deoxidizing after vacuum breaker, feeding
CaSi lines 120m.Quiet argon blowing time 30min, 0.1~0.3MPa of argon pressure after line feeding, with top of the slag fine motion, molten steel is not exposed to be
Standard, prevents secondary oxidation.1565 DEG C of bull ladle temperature.
4) continuous casting
Big 1560 DEG C of the first furnace temperature of bag, 1520~1530 DEG C of tundish temperature, pulling rate 0.80m/min, secondary cooling water compares water
Measure 0.23L/kg, M-EMS Current 400A, end electromagnetic agitation electric current 330A, frequency 8Hz.
5) electroslag remelting
Welded as electrode, enter casting billet surface side by side using the two section long 235mm × 265mm continuous casting billets of 3.2m before welding
Row reconditioning, removes scale on surface；Using auxiliary electrode by binary slag (CaF2+Al2O3) 100kg fusings, heated up after fusing
10min switchs to consutrode, and adjusts electric current normal smelting, electric current 12500A, voltage 61V；Electroslag ingot mould is cold after melting
60min, covers cold 48h.
6) heating rolling
1230 DEG C of heating-up temperature, soaking time 14h.1080 DEG C of breaking down temperature, 980 DEG C of finishing temperature；Rolling specs≤Ф
180mm。
7) anneal
Rolling carries out annealing heat-treats after insulation 12h after terminating, annealing temperature is 870 DEG C, and annealing is incubated 6h, 500 DEG C
Come out of the stove air cooling.
Claims (8)
1. a kind of method that continuous casting electroslag produces 4Cr5MoSiV1 die steels, it is characterised in that methods described includes following step
Suddenly：Side in electric arc furnace smelting molten steel, ladle refining furnace refined molten steel, vacuum degassing furnace refined molten steel, continuous casting 235mm × 265mm
Molten steel composition in base, electroslag remelting, heating rolling, annealing, the step controls as C by mass percentage：0.37~
0.43%th, Mn：0.30~0.50%, Si：0.90~1.20%, P：＜ 0.025%, S：0.010%th, Cr：4.80~5.50%,
Mo：1.20~1.50%, V：0.90~1.10%, Cu：＜ 0.25%, Ni：＜ 0.25%, surplus is iron and inevitably miscellaneous
Matter.
2. the method that continuous casting electroslag as claimed in claim 1 produces 4Cr5MoSiV1 die steels, it is characterised in that the electricity
Stove smelting molten steel step is using steel scrap hot metal charging as furnace charge, and by mass percentage, steel scrap accounts for 10~30%, and molten iron accounts for 70~
90%；With C amounts 1.10~1.30%, dioxygen oxidation, fierceness is seethed with excitement, flows slag, 1550~1580 DEG C of oxidizing temperature, decarburization weight automatically
Amount 0.25~0.30%, when tapping C be 0.05~0.25%, P≤0.010%, 1630~1670 DEG C of temperature, tapping 1/4~
Slag charge, pre-deoxidant, ferroalloy are added when 1/3.
3. the method that continuous casting electroslag as claimed in claim 1 produces 4Cr5MoSiV1 die steels, it is characterised in that the steel
C powder, FeSi powder 2~4kg/t deoxidiers, every crowd of 5~10min of interval time is added portionwise in bag refining furnace refined molten steel step；Entirely
Continue diffusive deoxidation after analysis, keep reducing atmosphere to bull ladle, the white slag retention time is no less than 20~30min；By control after deoxidation
A point lower limit C is made:0.37%th, Mn：0.30%th, Si：0.90%th, Cr：4.80%th, Mo：1.20%th, V：0.90%, add baking
Ferrochrome, molybdenum-iron, vanadium iron, by composition adjustment to target content, i.e. C：0.39%th, Mn：0.40%th, Si：1.00%th, P：
0.015%th, S：0.005%th, Cr：5.05%th, Mo：1.40%th, V：1.00%；Whole-process control 0.2~0.3MPa of argon pressure, prevents
Only molten steel is exposed causes secondary oxidation.
4. the method that continuous casting electroslag as claimed in claim 1 produces 4Cr5MoSiV1 die steels, it is characterised in that described true
In empty degasification furnace refined molten steel step, enter 1630~1660 DEG C of vacuum outgas furnace temperature, vacuum reaches below 100Pa, keep
15~25min of time；Final deoxidizing after vacuum breaker, feeding CaSi lines 0.5kg/t；Quiet 20~30min of argon blowing time, argon gas after line feeding
0.1~0.3MPa of pressure, with top of the slag fine motion, molten steel is not exposed to be defined, and prevents secondary oxidation；Bull ladle temperature control 1560~
1570℃。
5. the method that continuous casting electroslag as claimed in claim 1 produces 4Cr5MoSiV1 die steels, it is characterised in that the company
Cast in step, big to wrap 1565~1575 DEG C of the first furnace temperature, even pour 1545~1555 DEG C, 1515~1525 DEG C of tundish temperature,
0.80~0.85m/min of pulling rate, secondary cooling water specific water 0.23L/kg, M-EMS Current 400A, end electromagnetic agitation
Electric current 330A, frequency 8Hz；Total process protective is cast, and crystallizer protecting residue uses medium carbon steel covering slag；Strand cutting is using automatic
Plus the mode being manually combined, continuous casting billet red steel is rebasing, and two stove strands of upper pressure ensure glacing flatness, 30~40h of soaking time.
6. the method that continuous casting electroslag as claimed in claim 1 produces 4Cr5MoSiV1 die steels, it is characterised in that the electricity
In slag reflow step, 235mm × 265mm continuous casting billets are fabricated to；Crystallizer size is 630mm suitable for reading × lower mouth 660mm × height
1600mm, crystallizer is suitable for reading to be provided with argon gas-sealed circle, and makees following key control point：
1) the slag system quantity of slag：Using binary slag system, slag ratio CaF2：Al2O3=70%：30%, the quantity of slag：100kg；
2) setting electric current：12500A；Set voltage：61V；
3) the steel ingot type of cooling：The cold 60min of mould, covers cold 48h.
7. the method that continuous casting electroslag as claimed in claim 1 produces 4Cr5MoSiV1 die steels, it is characterised in that described to add
In hot rolling step, heating is using the heating of corner burner recuperative soaking pit, 1230 DEG C of heating-up temperature, 12~14h of soaking time；
Roll and use 800 blooming mills, 650 finishing mills, wherein 1050~1080 DEG C of breaking down temperature, 960~1000 DEG C of tandem rolling temperature,
Reduce mill table cooling water flow, it is to avoid steel ftracture.
8. the method that continuous casting electroslag as claimed in claim 1 produces 4Cr5MoSiV1 die steels, it is characterised in that described to move back
In fiery step, rolling carries out annealing heat-treats after terminating after insulation 12h, and it is 870 DEG C to control annealing temperature, annealing insulation 5h,
It is subsequently cooled to 500 DEG C of air coolings of coming out of the stove.
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| CN107447156A (en) * | 2017-08-01 | 2017-12-08 | 江油市长祥特殊钢制造有限公司 | Hot die steel and its production method |
| CN107488813A (en) * | 2017-08-10 | 2017-12-19 | 唐山志威科技有限公司 | The preparation method of high tenacity, high tropism ZW868 hot die steels |
| CN108728606A (en) * | 2018-05-09 | 2018-11-02 | 石家庄钢铁有限责任公司 | A kind of production technology of cold roller steel electroslag blank |
| CN108913981A (en) * | 2018-07-03 | 2018-11-30 | 肇庆市丰驰精密金属制品有限公司 | A kind of particulate metal material for high-speed rail braking |
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| CN109881097A (en) * | 2019-03-15 | 2019-06-14 | 四川丰元机械制造有限公司 | A kind of high-performance tool and mould band steel and its production technology |
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| WO2021134949A1 (en) * | 2019-12-31 | 2021-07-08 | 龙南龙钇重稀土科技股份有限公司 | Hot-work die steel electroslag remelting ingot and preparation method therefor |
| CN113502434A (en) * | 2021-06-01 | 2021-10-15 | 青海西钢特殊钢科技开发有限公司 | Aviation 30CrMnSiNi2A high-strength steel and production method thereof |
| CN114015924A (en) * | 2021-10-12 | 2022-02-08 | 攀钢集团江油长城特殊钢有限公司 | Preparation method of continuous casting and rolling H13 series hot work die steel |
| CN115094307A (en) * | 2022-05-30 | 2022-09-23 | 江苏联峰能源装备有限公司 | Hot work die steel continuous casting round billet for electroslag remelting and production process thereof |
| EP4092152A4 (en) * | 2020-12-31 | 2023-08-23 | Daye Special Steel Co., Ltd. | Steel for wind power gear with improved purity and reliability, and smelting method therefor |
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| EP4092152A4 (en) * | 2020-12-31 | 2023-08-23 | Daye Special Steel Co., Ltd. | Steel for wind power gear with improved purity and reliability, and smelting method therefor |
| CN113502434A (en) * | 2021-06-01 | 2021-10-15 | 青海西钢特殊钢科技开发有限公司 | Aviation 30CrMnSiNi2A high-strength steel and production method thereof |
| CN114015924A (en) * | 2021-10-12 | 2022-02-08 | 攀钢集团江油长城特殊钢有限公司 | Preparation method of continuous casting and rolling H13 series hot work die steel |
| CN114015924B (en) * | 2021-10-12 | 2022-09-02 | 攀钢集团江油长城特殊钢有限公司 | Preparation method of continuous casting and rolling H13 series hot work die steel |
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| CN106947908B (en) | 2018-05-18 |
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