CN106086673B - A kind of hot-work die steel plate and preparation method thereof - Google Patents
A kind of hot-work die steel plate and preparation method thereof Download PDFInfo
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- CN106086673B CN106086673B CN201610459770.1A CN201610459770A CN106086673B CN 106086673 B CN106086673 B CN 106086673B CN 201610459770 A CN201610459770 A CN 201610459770A CN 106086673 B CN106086673 B CN 106086673B
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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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- Crystallography & Structural Chemistry (AREA)
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Abstract
The present invention relates to a kind of hot-work die steel plate, % is calculated as the chemical composition of the steel plate by weight percent, C：0.45~0.55, Si：0.20~0.80, Mn：0.50~0.80, Cr：3.00~3.50, Mo：1.30~1.80, V：0.05~0.20, Nb：0.02~0.10, Als：0.01~0.04, P≤0.015, S≤0.005, remaining is Fe and inevitable impurity.Technological process is that hydrogen heating steel rolling heat treatment is expanded in the cogging of steel casting Heating Steel Ingots, there is provided a kind of production method of brand-new hot-work die steel plate, steel plate has good comprehensive mechanical performance in itself, its preparation method production stability is good, technological process is succinct, is easy to quantitatively produce hot die steel.
Description
Technical field
The present invention relates to hot die steel and preparation method thereof.
Background technology
In recent years, China's mould steel industry is developed rapidly, and is also achieved and larger is entered in terms of China hot die steel research
Exhibition, the fast-developing performance to hot die steel of modern manufacturing industry proposes higher requirement.Improve hot-work die Steel Properties
Mainly there are two approach：One is optimization steel grades and exploitation new steel grade；Two be that life is improved on the basis of frozen composition
Produce flow and optimize technique technology.Research and development of the China i.e. to hot die steel in " 12 " are planned are proposed clearly
It is required that.
Domestic hot die steel occurs the pole that a part is become a useful person with rolling mill practice, but rolling mill practice to forge based on material, also
The hot-work die steel plate production scale become a useful person is difficult to scale up, and reason is mainly two aspects：One is to generally believe that rolling mill practice is become a useful person
Hot-work die steel plate center portion it is second-rate, be not suitable for making more high-grade mould.Two be that the country is given birth to using continuous casting and rolling method
Hot die steel is produced, whole technological process is complicated, it is difficult to control, product qualification rate is low.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of hot die steel and its preparation for above-mentioned prior art
Method, using heavy and medium plate mill, is become a useful person with static ingot, by reasonably heating, rolling and Technology for Heating Processing, is produced and is added
Work is functional, thermal fatigue resistance is high, the preferable steel plate of quenching degree.And technical process is simple, easily-controlled operation is significantly improved
The qualification rate of product.
The present invention the used technical scheme that solves the above problems is：A kind of hot-work die steel plate, the steel plate chemistry into
% is calculated as point by weight percent, C：0.45~0.55, Si：0.20~0.80, Mn：0.50~0.80, Cr：3.00~3.50,
Mo：1.30~1.80, V：0.05~0.20, Nb：0.02~0.10, Als：0.01~0.04, P≤0.015, S≤0.005, its
Remaining is Fe and inevitable impurity.
The design principle of steel plate chemical composition of the present invention is as follows：
C：The solution strengthening effect of carbon is to improve steel plate hardness and the maximally efficient element of intensity significantly.Steel plate nodularization is moved back
After fire, carbon can be separated out in the form of globular carbide, be conducive to the machining of hot die steel.But carbon content should not mistake
Height, too high phosphorus content can reduce steel plate toughness, and the following process and use to hot die steel are unfavorable, present invention control carbon
Interval is 0.45~0.55%.
Si：Silicon is the essential elements of deoxidation in steel making, it may have certain solution strengthening effect, suitable silicone content can show
The elastic limit for improving steel, yield point and tensile strength are write, the scope of present invention control silicon is 0.20~0.80%.
Mn：In view of the high temperature rolling technique of this hot die steel, setting manganese content is unsuitable too high, it is to avoid steel grade crystal grain mistake
Divide thick tendency, the scope of present invention control manganese is in 0.50-0.80%.
V：Vanadium and the carbide of carbon formation, can improve steel grade hydrogen attack resistance under HTHP；During vanadium is ferrous materials
The alloying element of solid solution is easier to, its carbonitride formed has unique advantage, present invention control vanadium in terms of precipitation strength
Scope in 0.05-0.20%.
Nb：Niobium is a kind of strong carbonitride-forming elements, can effectively prevent growing up for austenite crystal during soaking, significantly
Improve steel without recrystallization temperature, steel plate is carried out non-recrystallization rolling, this hair within the scope of higher and wider temperature
The scope of bright control niobium is in 0.02-0.10%.
Cr：Chromium is the element for improving steel hardenability, can suppress the formation of polygonal ferrite and pearlite, promotes low temperature
The transformation of bainite or martensite is organized, intensity, hardness and the wearability of steel are improved, in addition, chromium can improve steel ingot corrosion resistant
Corrosion energy.Chromium content control is 3.00~3.50% in the present invention.
Mo：Molybdenum can refine steel grade crystal grain, improve quenching degree, thermostrength and the red hardness of steel, kept in high temperature
Enough intensity and creep resisting ability, molybdenum content of the invention are controlled 1.30~1.80%.
Al：Aluminium is to add micro aluminium in a kind of important deoxidant element in steelmaking process, molten steel, can effectively reduce steel
In inclusion content, and play a part of crystal grain thinning.But excessive aluminium can promote the formation of B type impurities, strand is reduced
Aluminium content control is 0.01~0.04% in surface quality, the present invention.
The hot-work die steel plate of the present invention is as follows the step of being rolled into material, preparation method with steel ingot：
1）Smelt：Electric furnace smelting is carried out from high-quality steel scrap, using furnace bottom paver ash manipulation, slag making operation in advance, stokehold
Making foamed slag is smelted and stays steel remaining slag operation, to obtain low P molten steel；It is true that molten steel carries out VD through LF deoxidation operations, to deoxidation molten steel
Empty degassing process, it is desirable to which final vacuum is not less than 15min in below 67Pa, dwell time, and silicon-calcium wire is fed afterwards, is mingled with
Thing is denatured, more than soft blow argon 5min after line feeding；
2）Casting：20~30 DEG C of molten steel overheat is controlled, whole process uses argon gas protective casting, is cast into anistree cast slab；
3）Heating：Steel ingot band mould is heat-fed to steel rolling process, and band mould is heat-fed the time：>=7 hours；Cleared up in time after the steel ingot demoulding
Enter to boil in a covered pot over a slow fire steel after stove, steel loading more than 6 hours, with 80~100 DEG C/h heating rate, be warming up to 950-1000 DEG C, insulation 8-10 is small
Shi Houzai is warming up to 1220-1280 DEG C, 1240-1260 DEG C of soaking zone temperature with 50~70 DEG C/h heating rate；
4）Split rolling method：950-1050 DEG C of start rolling temperature, is rolled using the big soft reduction process of low speed, and single pass rolling reduction >=
10%, overall compression ratio is 50~60%；
5）Expand hydrogen：Enter to heat stove heat after steel ingot cogging to make to expand hydrogen processing, it is desirable to billet surface temperature >=550 DEG C, enter stove
When 500 DEG C of furnace temperature ＞, annealing temperature is set to 640 ± 10 DEG C, insulation 48 hours and more than, furnace cooling after insulation；According to life
Produce desired size to be segmented steel plate strip temperature, surface quality of billet is checked in time, defective place's band temperature is cleared up；
6）Heating steel billet：Steel billet band temperature enters stove heat, and heating rate, soaking time and maximum heating temperature are with reference to step
3）Heating Steel Ingots parameter；
7）Steel rolling：Including two sections of roughing and finish rolling, 1000 ± 20 DEG C of roughing start rolling temperature, single pass rolling reduction >=10%, essence
Roll accurate control and treat temperature thickness and temperature, treat temperature thickness 100-150mm, treat 900-940 DEG C of temperature；The operation of rolling is needed 2~3 times
High-pressure water descaling, it is ensured that plate surface quality；2~3 planishing passes of increase before rolling terminates, it is ensured that steel plate flatness, roll rear steel
Plate enters cover heap slow cooling in time；
8）Heat treatment：Steel plate enters car type furnace and makees spheroidizing processing, and steel plate enters the auxiliary that stove needs preferred dimension to be more than steel plate
Lid is spread under slab, sheet pack installs additional and is not added with cushion block between stove, steel plate, it is ensured that steel plate template；Steel plate is divided to two sections of annealing temperatures.The
One 840 ± 10 DEG C of stage holding temperature, soaking time 3-8 hours is cooled to 700 ± 10 DEG C to be not more than 30 DEG C/h of cooling rate,
Carry out second stage insulation, soaking time 3-8 hour is cooled to 300 DEG C to be not more than 30 DEG C/h of cooling rate and come out of the stove, it is final must
To spheroidizing state hot-work die steel plate.
Compared with prior art, the advantage of the invention is that：
（1）The hot die steel of the present invention belongs to middle carbon high-alloy steel, and crack sensitivity is strong.To avoid static ingot from being stripped
After cool down too fast generation face crack, steel ingot needs band temperature to enter soaking pit, and soaking pit needs preheating, and the stewing steel process of setting slows down
Steel ingot cooling velocity.
（2）The present invention is heated using soaking pit to steel ingot, is designed heat stepwise system, is strictly set the rate of heat addition,
Ensure the penetrating of heating, uniformly.
（3）Steel ingot is provided with cogging process, in breaking down high temperature section using the big soft reduction process rolling of low speed, it is ensured that rolling deformation
Strand core can be penetrated into.
（4）The present invention expands hydrogen technique using Steel material, finds out the hot die steel by laboratory and reasonably expands hydrogen temperature
Degree and time are simultaneously applied to actual production.Steel plate after steel ingot cogging is carried out to expand hydrogen heat treatment, big thickness is favorably improved
The center portion quality of steel plate, is that further rolling process makees good place mat.
（5）The perfect supply of material kind of enterprise of hot-work die steel plate produced by the invention, replaces forging material with stocking, solves
Domestic to produce difficult with " continuous casting and direct rolling " production model, properties of product are unstable, the low technical barrier of product qualified rate.
This application provides a kind of production method of brand-new hot-work die steel plate, steel plate has good integrated machine in itself
Tool performance, its preparation method production stability is good, and technological process is succinct, is easy to quantitatively produce hot die steel.
Brief description of the drawings
Fig. 1 be in the embodiment of the present invention hot-work die steel plate along the tissue morphology figure at 1/4 thickness of slab；
Fig. 2 hot die steel cricket annealing process curve figures；
Fig. 3 hot die steel cricket annealing shove charge schematic diagrames.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing embodiment.
A kind of production technology of hot-work die steel plate, the production technology uses suitable composition design, belongs to middle carbon height and closes
Jin Gang, % is C to the chemical composition of steel plate by weight percent：0.45~0.55, Si：0.20~0.80, Mn：0.50~0.80,
Cr：3.00~3.50, Mo：1.30~1.80, V：0.05~0.20, Nb：0.02~0.10, Als：0.01~0.04, P≤
0.015, S≤0.005, remaining is Fe and inevitable impurity.
Comprise the following steps that：
1）Smelt：Electric furnace smelting is carried out from high-quality steel scrap, using furnace bottom paver ash manipulation, slag making operation in advance, stokehold
Making foamed slag is smelted and stays steel remaining slag operation, to obtain low P molten steel；Molten steel strictly controls refining time through LF deoxidation operations, and
Carry out line feeding operation；VD Fruit storages are carried out to deoxidation molten steel, it is desirable to which final vacuum is in below 67Pa, and the dwell time is not
Less than 15min, silicon-calcium wire is fed afterwards, carries out inclusion modification, more than soft blow argon 5min after line feeding；
2）Casting：20~30 DEG C of molten steel overheat is controlled, whole process uses argon gas protective casting, is cast into anistree cast slab；
3）Heating：Steel ingot band mould is heat-fed to steel rolling process, and band mould is heat-fed the time：>=7 hours；Cleared up in time after the steel ingot demoulding
Enter to boil in a covered pot over a slow fire steel after stove, steel loading more than 6 hours, with 80~100 DEG C/h heating rate, 1000 DEG C are warming up to, after being incubated 8-10 hours
Again with 50~70 DEG C/h heating rate, 1280 DEG C, 1260 DEG C of soaking zone temperature are warming up to；
4）Split rolling method：950-1050 DEG C of start rolling temperature, is rolled using the big soft reduction process of low speed, and single pass rolling reduction >=
10%, overall compression ratio is 50~60%；
5）Expand hydrogen：Enter to heat stove heat after steel ingot cogging to make to expand hydrogen processing, it is desirable to billet surface temperature >=550 DEG C, enter stove
When 500 DEG C of furnace temperature ＞, annealing temperature is set to 640 ± 10 DEG C, insulation 48 hours and more than, furnace cooling after insulation；According to life
Produce desired size to be segmented steel plate strip temperature, surface quality of billet is checked in time, defective place's band temperature is cleared up；
6）Heating steel billet：Steel billet band temperature enters stove heat, and heating rate, soaking time and maximum heating temperature are with reference to step
3）Heating Steel Ingots parameter；
7）Steel rolling：Including two sections of roughing and finish rolling, 1000 ± 20 DEG C of roughing start rolling temperature, single pass rolling reduction >=10%, essence
Roll accurate control and treat temperature thickness, treat temperature thickness 100-150mm, and treat temperature, 900-940 DEG C；The operation of rolling is needed 2~3 times
High-pressure water descaling, it is ensured that plate surface quality；2~3 planishing passes of increase before rolling terminates, it is ensured that steel plate flatness, roll rear steel
Plate enters cover heap slow cooling in time；
8）Heat treatment：Steel plate enters car type furnace and makees spheroidizing processing, and steel plate enters the auxiliary that stove needs preferred dimension to be more than steel plate
Lid is spread under slab, sheet pack installs additional and is not added with cushion block between stove, steel plate, it is ensured that steel plate template；Steel plate is divided to two sections of annealing temperatures.The
One 840 ± 10 DEG C of stage holding temperature, soaking time 3-8 hours is cooled to 700 ± 10 DEG C to be not more than 30 DEG C/h of cooling rate,
Carry out second stage insulation, soaking time 3-8 hour is cooled to 300 DEG C to be not more than 30 DEG C/h of cooling rate and come out of the stove, it is final must
To spheroidizing state hot-work die steel plate.
The hot-work die steel plate of above-mentioned technique productions can meet ASTM E381-01 standards, and no shrinkage cavity, sand holes, bubble are deposited
S2-R2-C3 requirements can met.Provided according to ASTM E-112, steel plate average austenite grain degree reaches more than 7.0 grades.
Field trash is examined according to ASTM E45 (A methods), the total rank of field trash is not more than 2.5 grades.Steel plate even tissue, as shown in figure 1, being
Black ball compound is the spheroidized carbide of spheroidizing formation, ball in metallographic structure at hot-work die steel plate thickness 1/4, tissue
Steel plate hardness≤229HB after annealing, meets the process requirements of user.Using the hot-work die steel plate of the technique productions in warp
Cross " normalizing（Air cooling）Hardness number reaches more than 56HRC after the heat treatment of+lonneal ", and steel plate combination property is good, especially
It is that grain size and plate surface quality are relatively forged material and increased, the technique productions cost is greatly lowered compared with forging technique of becoming a useful person.
Claims (1)
1. a kind of hot-work die steel plate, it is characterised in that：% is calculated as the chemical composition of the steel plate by weight percent, C：0.45~
0.55, Si：0.20~0.80, Mn：0.50~0.80, Cr：3.00~3.50, Mo：1.30~1.80, V：0.05~0.20, Nb：
0.02~0.10, Als：0.01~0.04, P≤0.015, S≤0.005, remaining is Fe and inevitable impurity；
The steel plate is to be rolled into material with steel ingot, and step is as follows：
1）Smelt：Electric furnace smelting is carried out from high-quality steel scrap, using furnace bottom paver ash manipulation, bubble is made in slag making operation in advance, stokehold
Foam slag melting and steel remaining slag operation is stayed, to obtain low P molten steel；Molten steel carries out line feeding operation through LF deoxidation operations；To dexidized steel
Water carries out VD Fruit storages, it is desirable to which final vacuum is not less than 15min in below 67Pa, dwell time, and silico-calcium is fed afterwards
Line, carries out inclusion modification, more than soft blow argon 5min after line feeding；
2）Casting：20~30 DEG C of molten steel overheat is controlled, whole process uses argon gas protective casting, is cast into anistree cast slab；
3）Heating：Steel ingot band mould is heat-fed to steel rolling process, and band mould is heat-fed the time：>=7 hours；Steel ingot the demoulding after in time clear up into
Steel is boiled in a covered pot over a slow fire after stove, steel loading more than 6 hours, with 80~100 DEG C/h heating rate, be warming up to 950~1000 DEG C, insulation 8~10 is small
Shi Houzai is warming up to 1220~1280 DEG C, 1240~1260 DEG C of soaking zone temperature with 50~70 DEG C/h heating rate；
4）Split rolling method：950~1050 DEG C of start rolling temperature, is rolled, single pass rolling reduction >=10% using the big soft reduction process of low speed,
Overall compression ratio is 50~60%；
5）Expand hydrogen：Enter to heat stove heat after steel ingot cogging to make to expand hydrogen processing, it is desirable to billet surface temperature >=550 DEG C, stove when entering stove
Warm 500 DEG C of ＞, annealing temperature is set to 640 ± 10 DEG C, insulation 48 hours and more than, furnace cooling after insulation；Will according to production
Ask size to be segmented steel plate strip temperature, surface quality of billet is checked in time, defective place's band temperature is cleared up；
6）Heating steel billet：Steel billet band temperature enters stove heat, and heating rate, soaking time and maximum heating temperature are with reference to step 3）'s
Heating Steel Ingots parameter；
7）Steel rolling：Including two sections of roughing and finish rolling, 1000 ± 20 DEG C of roughing start rolling temperature, single pass rolling reduction >=10%, finish rolling essence
Really temperature thickness is treated in control, treats 100~150mm of temperature thickness, and treat 900~940 DEG C of temperature；The operation of rolling needs 2~3 sub-high pressures
Water de-scaling, it is ensured that plate surface quality；Rolling terminate before increase by 2~3 planishing passes, it is ensured that steel plate flatness, roll rear steel plate and
When enter cover heap slow cooling；
8）Heat treatment：Steel plate enters car type furnace and makees spheroidizing processing, and steel plate enters the auxiliary slab that stove needs preferred dimension to be more than steel plate
Under spread lid, sheet pack installs additional and is not added with cushion block between stove, steel plate, it is ensured that steel plate template；Steel plate is divided to two sections of annealing temperatures, the first rank
840 ± 10 DEG C of holding temperature of section, soaking time 3~8 hours is cooled to 700 ± 10 DEG C to be not more than 30 DEG C/h of cooling rate, entered
Row second stage is incubated, soaking time 3~8 hours, and being cooled to 300 DEG C to be not more than 30 DEG C/h of cooling rate comes out of the stove, and finally gives
Spheroidizing state hot-work die steel plate.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106011420B (en) * | 2016-07-20 | 2017-12-19 | 东南大学 | A kind of preparation method of high uniformity mould steel |
| CN106670230B (en) * | 2016-12-23 | 2018-06-19 | 江苏沙钢集团淮钢特钢股份有限公司 | Cogging, tandem rolling and the cold big specification rectangle steel production technology being combined of control |
| CN109112391B (en) * | 2017-06-26 | 2020-05-29 | 鞍钢股份有限公司 | Hot work die steel and preparation method thereof |
| CN109518084A (en) * | 2018-12-07 | 2019-03-26 | 南京工业职业技术学院 | A kind of high heat conductance is containing Al, Nb nitriding hot die steel and preparation method thereof |
| CN109759475A (en) * | 2019-01-14 | 2019-05-17 | 舞阳钢铁有限责任公司 | A kind of steel ingot is become a useful person the milling method of ultra-wide super thick Cr-Mo steel plate |
| CN109897945B (en) * | 2019-03-15 | 2021-06-22 | 舞阳钢铁有限责任公司 | Production method of large-thickness ultra-wide chromium-molybdenum steel plate made of steel ingot |
| CN110016537A (en) * | 2019-03-20 | 2019-07-16 | 江阴兴澄特种钢铁有限公司 | A kind of production method of plastic mould steel refining ingot casting low-sulfur, phosphorus and low inclusion content |
| CN110193574B (en) * | 2019-05-10 | 2020-10-30 | 舞阳钢铁有限责任公司 | Production process of large-piece-weight extra-thick chromium-molybdenum steel plate |
| CN110616373A (en) * | 2019-09-29 | 2019-12-27 | 舞阳钢铁有限责任公司 | Hot-work die steel plate and production method thereof |
| CN111876662B (en) * | 2020-06-18 | 2022-04-12 | 江阴兴澄特种钢铁有限公司 | Hot-work die steel plate and manufacturing method thereof |
| CN113718094A (en) * | 2021-08-18 | 2021-11-30 | 山西太钢不锈钢股份有限公司 | Manufacturing method of hot-work die steel medium plate |
| CN115109912A (en) * | 2022-06-30 | 2022-09-27 | 张家港宏昌钢板有限公司 | Efficient heat treatment method for multilayer wear-resistant steel plate |
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| CN1138017C (en) * | 2000-06-08 | 2004-02-11 | 顺德市世创金属科技有限公司 | Middle-alloy chromium series hot die steel |
| CN101798661A (en) * | 2010-04-23 | 2010-08-11 | 庄龙兴 | Hot working die steel and preparation method thereof |
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