阅读说明：本技术 一种稀土nm450宽厚钢板及其生产方法 (A kind of rare earth NM450 Wide and Heavy Plates and its production method ) 是由 高军 屈文胜 薛越 李�浩 于 2019-09-18 设计创作，主要内容包括：本发明公开了一种稀土NM450宽厚钢板,包含以下重量百分数的组分：C：0.18～0.21％、Cr：0.45～0.85％、Ni：0.10～0.45％、B：0.0006～0.0015％,Ca：0.0010～0.0025％,稀土Re：0.0009～0.0020％。本发明还公开了稀土NM450宽厚钢板的生产方法。本发明的稀土NM450宽厚钢板及其生产方法,通过优化各组分以及稀土Re的含量,以及优化工艺方法得到的宽厚钢板具有高强度、高韧性、高塑性、高耐磨性能；不存在加工容易开裂等质量方面的缺陷,市场前景广阔,有利于满足社会发展的需要。(The invention discloses a kind of rare earth NM450 Wide and Heavy Plates, component comprising following weight percent: C:0.18~0.21%, Cr:0.45~0.85%, Ni:0.10~0.45%, B:0.0006~0.0015%, Ca:0.0010~0.0025%, rare earth Re:0.0009~0.0020%.The invention also discloses the production methods of rare earth NM450 Wide and Heavy Plates.Rare earth NM450 Wide and Heavy Plates of the invention and its production method have high intensity, high tenacity, high-ductility, high-wear resistance by the content of optimization each component and rare earth Re, and the Wide and Heavy Plates that optimization process obtains；There is no the defect in terms of the quality such as handling ease cracking, wide market is conducive to the needs for meeting social development.)

1. a kind of rare earth NM450 Wide and Heavy Plates, which is characterized in that the component comprising following weight percent:

C:0.18~0.21%, Cr:0.45~0.85%, Ni:0.10~0.45%, B:0.0006~0.0015%, Ca: 0.0010~0.0025%, rare earth Re:0.0009~0.0020%.

2. Wide and Heavy Plates as described in claim 1, which is characterized in that the Wide and Heavy Plates, it includes following weight percent Component:

C:0.18~0.21%, Si:0.20~0.30%, Mn:1.20~1.45%, P≤0.008%, S≤0.005%, Nb: 0.015~0.025%, Ti:0.008~0.015%, Cr:0.45~0.85%, Mo:0.15~0.45%, Ni:0.10~ 0.45%, Als:0.017~0.032%, B:0.0006~0.0015%, Ca:0.0010~0.0025%, rare earth Re: 0.0009~0.0020%.

3. a kind of production method of rare earth NM450, which is characterized in that the specific steps of the production method include:

Step 1, using Jing Guo KR desulfurization pretreatment molten iron and high-quality steel scrap as raw material, carry out converter smelting, then carry out LF refining and RH application of vacuum obtain molten steel；

The molten steel of step 1 is obtained heavy slab by continuous casting working procedure by step 2；

Step 3, the heavy slab for obtaining step 2 heat in heating furnace, and 1190 DEG C~1230 DEG C of slab heating temperature, when heating Between be 220~300min, soaking time be greater than 40min；

Slab after step 3 heating is carried out two-phase control rolling and cooling by step 4；

Step 5 obtains the rare earth NM450 Wide and Heavy Plates using same temperature hardening heat treatment step 4 steel board after cooling.

4. method as claimed in claim 3, which is characterized in that in the step 1,

When the RH application of vacuum, first 3~5 minutes addition Rare Earth Lanthanum cerium alloys of multiple pressure are carried out terminating vacuum.

5. method as claimed in claim 3, which is characterized in that in the step 2,

Permanent pulling rate when the continuous casting is 0.9~1.1m/min；Low overheat cast temperature when the continuous casting is 15~25 DEG C.

6. method as claimed in claim 3, which is characterized in that in the step 4,

The two-phase control rolling, it is 1170~1230 DEG C that the first stage, which rolls start rolling temperature, is 880~917 DEG C to temperature；The It is≤920 DEG C, 790~840 DEG C of finishing temperature that two-stage, which rolls start rolling temperature,；The cooling temperature is 670~720 DEG C.

7. method as claimed in claim 3, which is characterized in that in the step 5,

The isothermal hardening hardening heat is 890 DEG C~930 DEG C, and isothermal hardening time inside furnace is 1.5t+10min, and t is that steel plate is thick Degree.

8. the Wide and Heavy Plates that a kind of any one of claim 3~7 the method produces, which is characterized in that

The Wide and Heavy Plates include the component of following weight percent: C:0.18~0.21%, Si:0.20~0.30%, Mn: 1.20~1.45%, P≤0.008%, S≤0.005%, Nb:0.015~0.025%, Ti:0.008~0.015%, Cr: 0.45~0.85%, Mo:0.15~0.45%, Ni:0.10~0.45%, Als:0.017~0.032%, B:0.0006~ 0.0015%, Ca:0.0010~0.0025%, rare earth Re:0.0009~0.0020%；

The Wide and Heavy Plates tensile value is 1380~1448Mpa, and elongation percentage A50% is 19~23, surface and center portion it is average hard Degree is 421~467HBW.

Technical field

The present invention relates to metallurgical plate technical field more particularly to a kind of rare earth NM450 Wide and Heavy Plates and its production method.

Background technique

High-performance abrasion-proof steel is mainly used in mining machinery, coal mining machinery, environmental protection machinery, engineering machinery and conveying Machinery etc. wears the critical component at larger position and the more complex heavy heavy construction of applying working condition, it is desirable that has high-intensitive, height The stringent technical characterstics such as toughness, high-ductility, high abrasion, big thickness.

Summary of the invention

In view of the drawbacks described above of the prior art, it is raw that the technical problem to be solved by the present invention is to wear-resisting steel plates in the prior art Production. art is complicated, and process flow is long, at high cost, and that there are low-temperature impact toughness is poor for obtained wear-resisting steel plate, center portion wearability is poor, Defect problem in terms of the quality such as handling ease cracking.

To achieve the above object, the present invention provides a kind of rare earth NM450 Wide and Heavy Plates, it includes following weight percent Component: C:0.18~0.21%, Cr:0.45~0.85%, Ni:0.10~0.45%, B:0.0006~0.0015%, Ca: 0.0010~0.0025%, rare earth Re:0.0009~0.0020%.

Further, the Wide and Heavy Plates, it includes the components of following weight percent: C:0.18~0.21%, Si: 0.20~0.30%, Mn:1.20~1.45%, P≤0.008%, S≤0.005%, Nb:0.015~0.025%, Ti: 0.008~0.015%, Cr:0.45~0.85%, Mo:0.15~0.45%, Ni:0.10~0.45%, Als:0.017~ 0.032%, B:0.0006~0.0015%, Ca:0.0010~0.0025%, rare earth Re:0.0009~0.0020%；

In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of C is 0.18%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of C is 0.20%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of C is 0.21%；

In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Si is 0.2%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Si is 0.25%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Si is 0.3%；

In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Mn is 1.2%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Mn is 1.25%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Mn is 1.45%；

In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of P is 0.007%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of P is 0.006%；

In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of S is 0.003%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of S is 0.002%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of S is 0.001%；

In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Nb is 0.015%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Nb is 0.020%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Nb is 0.025%；

In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Ti is 0.008%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Ti is 0.010%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Ti is 0.015%；

In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Cr is 0.45%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Cr is 0.80%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Cr is 0.85%；

In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Mo is 0.40%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Mo is 0.15%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Mo is 0.45%；

In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Ni is 0.40%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Ni is 0.12%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Ni is 0.45%；

In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Als is 0.017%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Als is 0.025%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Als is 0.030%；

In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of B is 0.0008%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of B is 0.0015%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of B is 0.0006%；

In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Ca is 0.0010%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Ca is 0.0018%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Ca is 0.0025%；

In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of rare earth Re is 0.0009%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of rare earth Re is 0.0017%；

In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of rare earth Re is 0.0020%；

Another aspect of the present invention provides a kind of production method of rare earth NM450 Wide and Heavy Plates, comprising the following steps:

Step 1, using Jing Guo KR desulfurization pretreatment molten iron and high-quality steel scrap as raw material, carry out converter smelting, then It carries out LF refining and RH application of vacuum obtains molten steel；

The molten steel of step 1 is obtained heavy slab by continuous casting working procedure by step 2；

Step 3, the heavy slab for obtaining step 2 heat in heating furnace, 1190 DEG C~1230 DEG C of slab heating temperature, add The hot time is 220~300min, and soaking time is greater than 40min；

Slab after step 3 heating is carried out two-phase control rolling and cooling by step 4；

Step 5 obtains the rare earth NM450 Wide and Heavy Plates using same temperature hardening heat treatment step 4 steel board after cooling:

Further, the production method of the Wide and Heavy Plates, in the step 1, when the RH application of vacuum, terminate it is true Sky carries out first 3~5 minutes addition Rare Earth Lanthanum cerium alloys of multiple pressure；

Further, the production method of the Wide and Heavy Plates, step 1 specific steps are as follows: using pre- by KR desulfurization The molten iron of processing and high-quality steel scrap are as raw material, and bottom-blowing of converter is using whole Argon mode, terminal hit at first time, to reduce because mending Blowing leads to molten steel nitrogen pick-up；The further deoxidation of LF ladle refining furnace, desulfurization, removal be mingled with, adjusting component and temperature, strict control Argon intensity formulates Argon curve according to the principle that early period is strong, mid-term is weak compared with strong, later period, is guaranteeing deoxidation, deep desulfurization, alloy While change, secondary oxidation and the nitrogen pick-up of refining process are reduced；RH process is guaranteeing liquid steel temperature using deep degasification technique is recycled The gas contents such as hydrogen, oxygen, nitrogen are greatly reduced under the premise of stabilization, reduce adverse effect of the pernicious gas to steel, Rare Earth Lanthanum cerium Alloy is added for 3-5 minutes before being vacuum-treated the multiple pressure of end by vacuum chute；Finally obtain the quality percentage of molten steel ingredient Than for C:0.18~0.21%, Si:0.20~0.30%, Mn:1.20~1.45%, P≤0.008%, S≤0.005%, Nb: 0.015~0.025%, Ti:0.008~0.015%, Cr:0.45~0.85%, Mo:0.15~0.45%, Ni:0.10~ 0.45%, Als:0.017~0.032%, B:0.0006~0.0015%, Ca:0.0010~0.0025%, rare earth Re: 0.0009~0.0020%, surplus is Fe and inevitable impurity；

Further, the production method of the Wide and Heavy Plates, in the step 2, when the continuous casting, permanent pulling rate is 0.9~ 1.1m/min；Low overheat cast temperature is 15~25 DEG C；

Further, the production method of the Wide and Heavy Plates, in the step 2, continuous casting heavy slab with a thickness of 250mm or 300mm；

Further, the production method of the Wide and Heavy Plates, step 2 specific steps are as follows: conticaster is straight arc company Casting machine, using great Bao, middle water-coating port blowing argon, solidification end dynamic soft-reduction, 380A high current electromagnetic agitation and optimization Dynamic secondary cooling technology, by constant temperature, permanent pulling rate technique (0.9~1.1m/min), low overheat is cast (15~25 DEG C), is subtracted The defects of light continuous casting billet center segregation, center porosity, crackle, oscillation mark, production obtains the high-quality plate of thickness 250mm and 300mm Base；

Further, the production method of the Wide and Heavy Plates, in the step 4, the two-phase control rolling, the first stage rolls Start rolling temperature processed is 1170~1230 DEG C, is 880~917 DEG C to temperature；It is≤920 DEG C that second stage, which rolls start rolling temperature, 790~840 DEG C of finishing temperature；

Further, the production method of the Wide and Heavy Plates, in the step 4, cooling temperature is 670~720 DEG C；

Further, the production method of the Wide and Heavy Plates, in the step 5, the isothermal hardening hardening heat is 890 DEG C~930 DEG C, isothermal hardening time inside furnace is 1.5t+10min, and t is steel plate thickness (unit mm)；

In better embodiment of the invention, the production method of the Wide and Heavy Plates, in the step 3, the slab 1190 DEG C of heating temperature；

In another better embodiment of the invention, the production method of the Wide and Heavy Plates is described in the step 3 1210 DEG C of slab heating temperature；

In better embodiment of the invention, the production method of the Wide and Heavy Plates, in the step 3, the slab Heating time is 293min；

In another better embodiment of the invention, the production method of the Wide and Heavy Plates is described in the step 3 Slab heating time is 289min；

In another better embodiment of the invention, the production method of the Wide and Heavy Plates is described in the step 3 Slab heating time is 239min；

In better embodiment of the invention, the production method of the Wide and Heavy Plates, in the step 4, two rank Section rolling, it is 1170 DEG C that the first stage, which rolls start rolling temperature,；

In another better embodiment of the invention, the production method of the Wide and Heavy Plates is described in the step 4 Two-phase control rolling, it is 1200 DEG C that the first stage, which rolls start rolling temperature,；

In another better embodiment of the invention, the production method of the Wide and Heavy Plates is described in the step 4 Two-phase control rolling, it is 1225 DEG C that the first stage, which rolls start rolling temperature,；

In better embodiment of the invention, the production method of the Wide and Heavy Plates, in the step 4, two rank Section rolling, first stage rolling is 880 DEG C to temperature；

In another better embodiment of the invention, the production method of the Wide and Heavy Plates is described in the step 4 Two-phase control rolling, first stage rolling is 890 DEG C to temperature；

In another better embodiment of the invention, the production method of the Wide and Heavy Plates is described in the step 4 Two-phase control rolling, first stage rolling is 910 DEG C to temperature；

In better embodiment of the invention, the production method of the Wide and Heavy Plates, in the step 4, two rank Section rolling, the finishing temperature of second stage rolling are 810 DEG C；

In another better embodiment of the invention, the production method of the Wide and Heavy Plates is described in the step 4 Two-phase control rolling, the finishing temperature of second stage rolling are 790 DEG C；

In better embodiment of the invention, the production method of the Wide and Heavy Plates, in the step 4, cooling temperature It is 670 DEG C；

In another better embodiment of the invention, the production method of the Wide and Heavy Plates is cooling in the step 4 Temperature is 700 DEG C；

In another better embodiment of the invention, the production method of the Wide and Heavy Plates is cooling in the step 4 Temperature is 720 DEG C；

In better embodiment of the invention, the production method of the Wide and Heavy Plates, in the step 5, the isothermal Quenching hardening heat is 890 DEG C；

In another better embodiment of the invention, the production method of the Wide and Heavy Plates is described in the step 5 Isothermal hardening hardening heat is 901 DEG C；

In another better embodiment of the invention, the production method of the Wide and Heavy Plates is described in the step 5 Isothermal hardening hardening heat is 907 DEG C；

Using above scheme, rare earth NM450 Wide and Heavy Plates and its production method disclosed by the invention have following technology effect Fruit:

(1) rare earth NM450 Wide and Heavy Plates of the invention, the wear-resisting steel plate phase of close yield strength with NM in the prior art Than, the application Wide and Heavy Plates, pass through each component in optimization Wide and Heavy Plates and add the content of the rare earth Re of proper ratio, Ni, Cr, Ca, B component content, obtained rare earth NM450 Wide and Heavy Plates have high intensity, high tenacity, high-ductility, high-wear resistance, effectively Improve the defect of existing wear-resisting steel plate handling ease cracking；

(2) production method of rare earth NM450 Wide and Heavy Plates of the invention, optimization production method use same temperature hardening heat treatment Method avoids the thermal treatment production process method using quenching+tempering disclosed in the prior art, it is crisp to effectively prevent lonneal Property, the sensibility of steel plate quenching stress cracking is reduced, simplifies and shortens process flow, reduces production cost；

(3) rare earth NM450 Wide and Heavy Plates production method of the invention, by optimize the temperature of production method, the time, etc. works Skill parameter, obtained rare earth NM450 Wide and Heavy Plates metallographic structure are that crystal grain is tiny and uniform martensitic structure, are conducive to improve The low-temperature impact toughness and center portion wearability of steel plate improve product quality；

(4) the obtained rare earth NM450 Wide and Heavy Plates product of the present invention can be widely used for mining machinery, coal mining it is mechanical, Environmental protection machinery, engineering machinery and conveying machinery etc. wear the pass at larger position and the more complex heavy heavy construction of applying working condition Key member etc. needs the preparation of wear parts, is conducive to promote and apply；

In conclusion rare earth NM450 Wide and Heavy Plates of the invention and its production method, by optimization each component and add conjunction Content, Ni, Cr, Ca, the B component content of the rare earth Re of suitable ratio, and the Wide and Heavy Plates that optimization process obtains have height Intensity, high tenacity, high-ductility, high-wear resistance；There is no the defect in terms of the quality such as handling ease cracking, market prospects are wide It is wealthy, be conducive to the needs for meeting social development, the production method of Wide and Heavy Plates of the invention, process is simple, and it is at low cost, it fits Close industrialized production.

Make below with reference to technical effect of the specific embodiment to design of the invention, specific structure and generation further Illustrate, to fully understand the purposes, features and effects of the present invention.

Specific embodiment

The preferred embodiment of the present invention introduced below keeps its technology contents more clear and is easy to understand.The present invention can be with It is emerged from by many various forms of embodiments, protection scope of the present invention is not limited only to the implementation mentioned in text Example.