CN114058816A - Alternative method for reducing heat treatment process of NM400 - Google Patents
Alternative method for reducing heat treatment process of NM400 Download PDFInfo
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- CN114058816A CN114058816A CN202111410844.XA CN202111410844A CN114058816A CN 114058816 A CN114058816 A CN 114058816A CN 202111410844 A CN202111410844 A CN 202111410844A CN 114058816 A CN114058816 A CN 114058816A
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- steel
- heat treatment
- temperature
- alternative method
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- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000010438 heat treatment Methods 0.000 title claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 47
- 239000010959 steel Substances 0.000 claims abstract description 47
- 238000005096 rolling process Methods 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 18
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 239000011574 phosphorus Substances 0.000 claims abstract description 5
- 238000012937 correction Methods 0.000 claims abstract description 4
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- 238000007639 printing Methods 0.000 claims abstract description 4
- 238000012545 processing Methods 0.000 claims abstract description 4
- 229910000734 martensite Inorganic materials 0.000 claims description 3
- 229910001563 bainite Inorganic materials 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 239000007921 spray Substances 0.000 abstract description 2
- 238000010791 quenching Methods 0.000 description 5
- 230000000171 quenching effect Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000005098 hot rolling Methods 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
-
- 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
- C21D8/0242—Flattening; Dressing; Flexing
-
- 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
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Abstract
The invention relates to an alternative method for reducing heat treatment procedures of NM400, which specifically comprises the steps of heating NM400 steel at low temperature; primarily removing phosphorus from the heated NM400 steel; rolling the NM400 steel with the primary phosphorus removal by using a rolling mill, and performing two-stage rolling control by using a TMCP (thermal mechanical control processing) process; carrying out high-speed cooling treatment by using an ACC cooling device until the temperature of NM400 steel is rapidly and forcibly cooled to 250-300 ℃; carrying out hot straightening on NM400 steel; carrying out temperature correction on NM400 steel; performing finishing flame cutting on NM400 steel, and performing spray printing and warehousing; the invention reduces the heat treatment process and saves the manufacturing cost.
Description
Technical Field
The invention relates to an alternative method for reducing heat treatment procedures by NM400, belonging to the technical field of steel plate manufacturing.
Background
NM400 steel is a material for manufacturing hoppers and the like of excavators, has high wear resistance which is more than 20 times that of low-carbon steel, has high-temperature wear resistance due to high Cr content and still has higher wear resistance under the high-temperature working condition of 500 plus 600 ℃. The strength reaches 1300MPa, which is far more than the conventional strength of 500 MPa.
In the conventional process, NM400 steel is hot rolled and heat treated, that is, NM400 steel produced in a sand steel wide and thick plate workshop is delivered by heat treatment, and because the heat treatment cost is high, a technology capable of reducing heat treatment is urgently needed to be researched, so that the purpose of saving the treatment cost can be achieved, and the treatment performance is not influenced.
Disclosure of Invention
The invention provides an alternative method for reducing the heat treatment process of NM400, which reduces the heat treatment process and saves the manufacturing cost.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an alternative method for reducing the heat treatment process of NM400 specifically comprises the following steps:
step S1, heating NM400 steel at low temperature;
step S2, carrying out primary phosphorus removal on the heated NM400 steel;
step S3, rolling the primarily dephosphorized NM400 steel by using a rolling mill, and performing two-stage rolling control by using a TMCP (thermal mechanical control processing) process;
step S4, carrying out high-speed cooling treatment by using an ACC cooling device until the temperature of NM400 steel is rapidly and forcibly cooled to 250-300 ℃;
step S5, carrying out hot straightening on NM400 steel;
step S6, performing temperature correction on NM400 steel;
step S7, finishing and flame cutting NM400 steel, spray printing and warehousing;
in a further preferred embodiment of the present invention, in step S1, the low-temperature heating temperature is 1160 ± 20 ℃;
as a further preferable mode of the present invention, in step S3, the rolling mill is a five-meter rolling mill, and NM400 steel is rolled to 840 ℃ to 870 ℃;
as a further preferred aspect of the present invention, in step S4, after high-speed cooling by the ACC cooling apparatus, a bainite-martensite bonded structure is generated;
as a further preferred aspect of the present invention, in step S5, NM400 steel is subjected to hot straightening and cooled to a temperature of 100 ℃ to 150 ℃.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
according to the invention, through the treatment process combining hot rolling and on-line quenching, the NM400 steel achieves the heat treatment performance, and meanwhile, the heat treatment process is reduced, so that the purpose of reducing the manufacturing cost is achieved.
Detailed Description
As explained in the background art, the NM400 steel produced in the current unit is delivered by heat treatment, which directly results in higher heat treatment cost, so the present application aims to provide an alternative method for reducing the heat treatment process of NM400, so that the performance of NM400 is consistent with the performance after heat treatment, and simultaneously, the heat treatment cost can be reduced, and the cost is saved.
Specifically, the method comprises the following steps:
step S1, heating NM400 steel at a low temperature of 1160 +/-20 ℃;
step S2, carrying out primary phosphorus removal on the heated NM400 steel;
step S3, rolling the primarily dephosphorized NM400 steel by a five-meter rolling mill, rolling the NM400 steel to 840-870 ℃, and performing two-stage rolling control by a TMCP (thermal mechanical control processing) process; the hot rolling process is adopted to replace the heat treatment process, and the final rolling temperature is increased to more than 840 ℃, so that ferrite can be avoided, and the ferrite generated in the rolling process of the conventional process is eliminated by the heat treatment process, so that the process of the step S3 can realize that the NM400 steel achieves the heat treatment performance;
step S4, carrying out high-speed cooling treatment by adopting an ACC cooling device until the temperature of NM400 steel is rapidly and strongly cooled to 250-300 ℃ to generate a bainite and martensite combined structure, replacing a ferrite and pearlite combined structure in the conventional process, wherein the ferrite and pearlite combined structure generated in the conventional process has lower strength; the high-speed cooling to a certain temperature is to use the residual temperature for plate shape straightening;
step S5, carrying out hot straightening on NM400 steel, and cooling the temperature to 100-150 ℃; the reason why straightening is needed is that because the directly rolled steel plate has certain unevenness, the steel plate is seriously deformed after high-speed forced cooling, and the temperature is reduced to 100-150 ℃ at the same time, because the hot rolling and the heat treatment process of the conventional process are combined, the strength of the hot rolled high-temperature steel plate is low, the straightening can be easily leveled to reach the standard of the technical requirement, and the hot rolling and the forced cooling treatment process required by the application do not have the condition of easy leveling, so the temperature after forced cooling needs to be carefully controlled, and the straightening is facilitated;
step S6, performing temperature correction on NM400 steel;
and step S7, finishing and hot cutting the NM400 steel, and spraying and printing the steel for storage.
At this point, it should be emphasized that the application No. 2017102045301 found by the applicant in the search process discloses a method for producing thin-gauge high-Ti wear-resistant steel NM400 by on-line quenching, which comprises the steps of blast furnace molten iron, molten iron pretreatment, converter smelting, LF furnace refining, RH furnace refining, sheet bar continuous casting, heating furnace, high-pressure water dephosphorization, hot continuous rolling unit, ultra-fast cooling quenching, coiling, heat preservation pit heat preservation, leveling, finishing and inspection. The above application also provides a similar quenching process in a superficial view, but it emphasizes on the on-line quenching mode of high titanium, and the foregoing method cannot solve the plate type problem when used in actual production.
By the method, a large amount of debugging and verification are carried out, mass production and delivery are formed, after the verification, the performance and the plate type completely reach the delivery standard, the heat treatment process is omitted, and the cost of 200 yuan/ton is saved.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "and/or" as used herein is intended to include both the individual components or both.
The term "connected" as used herein may mean either a direct connection between components or an indirect connection between components via other components.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (5)
1. An alternative method of reducing the thermal process steps of NM400, characterized by: the method specifically comprises the following steps:
step S1, heating NM400 steel at low temperature;
step S2, carrying out primary phosphorus removal on the heated NM400 steel;
step S3, rolling the primarily dephosphorized NM400 steel by using a rolling mill, and performing two-stage rolling control by using a TMCP (thermal mechanical control processing) process;
step S4, carrying out high-speed cooling treatment by using an ACC cooling device until the temperature of NM400 steel is rapidly and forcibly cooled to 250-300 ℃;
step S5, carrying out hot straightening on NM400 steel;
step S6, performing temperature correction on NM400 steel;
and step S7, finishing and hot cutting the NM400 steel, and spraying and printing the steel for storage.
2. The NM400 alternative method of reducing heat treatment processes according to claim 1, wherein: in step S1, the low-temperature heating temperature is 1160. + -. 20 ℃.
3. The NM400 alternative method of reducing heat treatment processes according to claim 1, wherein: in step S3, the rolling mill adopts a five-meter rolling mill to roll the NM400 steel to 840-870 ℃.
4. The NM400 alternative method of reducing heat treatment processes according to claim 1, wherein: in step S4, after high-speed cooling by the ACC cooling apparatus, a bainite/martensite bonded structure is generated.
5. The NM400 alternative method of reducing heat treatment processes according to claim 1, wherein: in step S5, NM400 steel is hot straightened and cooled to a temperature of 100 ℃ to 150 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111410844.XA CN114058816A (en) | 2021-11-25 | 2021-11-25 | Alternative method for reducing heat treatment process of NM400 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111410844.XA CN114058816A (en) | 2021-11-25 | 2021-11-25 | Alternative method for reducing heat treatment process of NM400 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114058816A true CN114058816A (en) | 2022-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111410844.XA Pending CN114058816A (en) | 2021-11-25 | 2021-11-25 | Alternative method for reducing heat treatment process of NM400 |
Country Status (1)
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105755373A (en) * | 2016-04-01 | 2016-07-13 | 华南理工大学 | Method for producing steel NM400 |
| CN107012396A (en) * | 2017-03-06 | 2017-08-04 | 河南理工大学 | Microalloy Bainite/Martensite Dual-Phase NM400 steel plates and preparation method thereof |
| CN107099727A (en) * | 2017-03-31 | 2017-08-29 | 华南理工大学 | A kind of ultrafast cold press quenching production Thin Specs abrasion-resistant stee NM400 method |
| CN109609843A (en) * | 2018-12-11 | 2019-04-12 | 山东钢铁股份有限公司 | Think gauge wear-resisting steel plate and preparation method thereof in a kind of low residual stress |
-
2021
- 2021-11-25 CN CN202111410844.XA patent/CN114058816A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105755373A (en) * | 2016-04-01 | 2016-07-13 | 华南理工大学 | Method for producing steel NM400 |
| CN107012396A (en) * | 2017-03-06 | 2017-08-04 | 河南理工大学 | Microalloy Bainite/Martensite Dual-Phase NM400 steel plates and preparation method thereof |
| CN107099727A (en) * | 2017-03-31 | 2017-08-29 | 华南理工大学 | A kind of ultrafast cold press quenching production Thin Specs abrasion-resistant stee NM400 method |
| CN109609843A (en) * | 2018-12-11 | 2019-04-12 | 山东钢铁股份有限公司 | Think gauge wear-resisting steel plate and preparation method thereof in a kind of low residual stress |
Non-Patent Citations (2)
| Title |
|---|
| 孙玮: "《中厚板生产900问》", 31 July 2014, 冶金工业出版社, pages: 333 - 335 * |
| 李智: "《低碳贝氏体型非调质钢的控轧控冷》", 东北大学出版社, pages: 81 * |
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