CN105861939B - A kind of method for producing NM360 steel - Google Patents
A kind of method for producing NM360 steel Download PDFInfo
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- CN105861939B CN105861939B CN201610208029.8A CN201610208029A CN105861939B CN 105861939 B CN105861939 B CN 105861939B CN 201610208029 A CN201610208029 A CN 201610208029A CN 105861939 B CN105861939 B CN 105861939B
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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
-
- 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
- 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
-
- 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
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The present invention provides a kind of method for producing NM360 steel, and wherein method includes step：NM360 steel is obtained after molten iron and steel scrap are carried out into continuous casting, hot rolling after pneumatic steelmaking, ladle refining furnace refining and the refining of RH vacuum circulation degassings；Wherein hot rolling includes：Then rolled using roughing, finish rolling two-stage control, roughing uses high temperature heavy reduction rolling, last 3 passage of finish rolling uses small percentage pass reduction, relaxation 20s~60s after the completion of finish rolling, into Ultrafast cooling device, cooldown rate is 40 DEG C/s~100 DEG C/s, is cooled to 280 DEG C~350 DEG C, aligned subsequently into heat rectification machine, then sheared, examined, finishing.Energy consumption is reduced, shortens technological process, reduces alloy addition, the quenching degree for rolling steel plate after rear directly ultra-rapid cooling reheats quenching technical than tradition and increases 1.4~1.5 times, improves the tough proportioning of steel, saves social resources, reduces production cost.
Description
Technical field
The invention belongs to Pipeline Steel Plate manufacturing technology field.A kind of more particularly to method for producing NM360 steel.
Background technology
In the fields such as metallurgy, mine, building materials and military affairs, many workpiece and equipment are failed rapidly due to abrasion, are caused
Material, the huge waste low-alloy wear-resistant steels of the energy are transported extensively with the good comprehensive mechanical property such as its high rigidity, high-wearing feature
For various wear working conditions.
Traditional anti-wear steel NM360 carries out out-line quenching, tempering process after hot rolling, and energy consumption is big, technological process it is long, it is necessary to
Add a large amount of alloys.
The content of the invention
It is an object of the present invention to provide a kind of method for producing NM360 steel, energy consumption is reduced, shortens technological process, is reduced
Alloy addition, the quenching degree for rolling steel plate after rear directly ultra-rapid cooling reheat quenching technical than tradition and increased, improves
The tough proportioning of steel, social resources are saved, reduce production cost.
To achieve the above object, the technical solution adopted by the present invention is：A kind of method for producing NM360 steel, including：
Molten iron and steel scrap are subjected to continuous casting after pneumatic steelmaking, ladle refining furnace refining and the refining of RH vacuum circulation degassings,
NM360 steel is obtained after hot rolling；Wherein, the chemical composition of the strand of continuous casting and its content are：C is 0.16wt%~0.20wt%,
Si is 0.2wt%~0.4wt%, and Mn is 1.2wt%~1.8wt%, and Mo is 0.10wt%~0.30wt%, Cr 0.10wt%
~0.30wt%, Nb are 0.00wt%~0.04wt%, and Ti is 0.00wt%~0.02wt%, P<0.015wt%, S<
0.010wt%, remaining is Fe and impurity；Wherein, hot rolling technology flow includes：By thickness 150mm heating steel billets at 1150 DEG C
~1250 DEG C, then rolled using roughing, finish rolling two-stage control, roughing uses high temperature heavy reduction rolling, reduction in pass
Small percentage pass reduction is used more than 15mm, roughing outlet temperature >=1000 DEG C, final rolling temperature≤920 DEG C, last 3 passage of finish rolling,
Every time reduction ratio≤10%, finish rolling exit thickness are 9mm~18mm, 760 DEG C~850 DEG C of exit temperature at finishing, and finish rolling is completed
Relaxation 20s~60s afterwards, into Ultrafast cooling device, cooldown rate is 40 DEG C/s~100 DEG C/s, is cooled to 280 DEG C~350
DEG C, aligned subsequently into heat rectification machine, then sheared, examined, finishing.
The present invention is carried out microalloying from micro Mo, Cr, Nb, Ti alloy, passed through by rational Alloying Design
Relaxation ultra-rapid cooling technology controlling and process microstructure after controlled rolling, the hydrodynamics effect of alloy is given full play to, reduces alloy
Addition and precious alloy usage amount, and simplify and out-line quenching, tempering process carried out after traditional abrasion-resistant stee hot rolling, adopt
With the method compared with traditional handicraft, energy consumption is reduced, shortens technological process, reduces alloy addition, after rolling directly
The quenching degree of steel plate reheats quenching technical than tradition and increases 1.4~1.5 times after ultra-rapid cooling, improves the tough of steel and matches somebody with somebody
Than saving social resources, reducing production cost.
In order to realize above-mentioned and related purpose, one or more aspects of the invention include will be explained in below and
The feature particularly pointed out in claim.Some illustrative aspects of the present invention are described in detail in following explanation and accompanying drawing.
However, some modes in the various modes of the principle that the present invention only can be used of these aspect instructions.It is in addition, of the invention
It is intended to include all these aspects and their equivalent.
Brief description of the drawings
According to following detailed descriptions carried out referring to the drawings, above and other objects, features and advantages of the invention will become
It must become apparent from.In the accompanying drawings：
Fig. 1 shows an a kind of schematic flow sheet of method for producing NM360 steel proposed by the present invention.
Identical label indicates similar or corresponding feature or function in all of the figs.
Embodiment
Various aspects of the disclosure is described below.It is to be understood that teaching herein can have in the form of varied
Body embodies, and any concrete structure disclosed herein, function or both are only representational.Religion based on this paper
Lead, those skilled in the art it is to be understood that one aspect disclosed herein can be realized independently of any other aspect,
And two or more aspects in these aspects can combine in various manners.It is it is, for example, possible to use described in this paper
Any number of aspect, realization device or puts into practice method.Further, it is possible to use other structures, function or except described here
One or more aspects outside or be not one or more aspects described herein 26S Proteasome Structure and Function, realize this device
Or put into practice this method.In addition, any aspect described herein can include at least one element of claim.
Each embodiment of the present invention is described below with reference to accompanying drawings.
Referring first to Fig. 1, a kind of method for producing NM360 steel, including step：
S1, molten iron and steel scrap refined through pneumatic steelmaking, ladle refining furnace refining and RH vacuum circulation degassings；
S2, obtain NM360 steel after carrying out continuous casting, hot rolling.
Wherein, the chemical composition of the strand of continuous casting and its content are：C is 0.16wt%~0.20wt%, Si 0.2wt%
~0.4wt%, Mn are 1.2wt%~1.8wt%, and Mo is 0.10wt%~0.30wt%, and Cr is 0.10wt%~0.30wt%,
Nb is 0.00wt%~0.04wt%, and Ti is 0.00wt%~0.02wt%, P<0.015wt%, S<0.010wt%, remaining is
Fe and impurity；Wherein, hot rolling technology flow includes：By thickness 150mm heating steel billets at 1150 DEG C~1250 DEG C, then use
Roughing, the rolling of finish rolling two-stage control, roughing use high temperature heavy reduction rolling, and reduction in pass is more than 15mm, roughing outlet
Temperature >=1000 DEG C, final rolling temperature≤920 DEG C, last 3 passage of finish rolling use small percentage pass reduction, and every time reduction ratio≤
10%, finish rolling exit thickness is 9mm~18mm, 760 DEG C~850 DEG C, relaxation 20s~60s after the completion of finish rolling of exit temperature at finishing,
Into Ultrafast cooling device, cooldown rate is 40 DEG C/s~100 DEG C/s, is cooled to 280 DEG C~350 DEG C, is rectified subsequently into heat
Machine is aligned, then is sheared, examined, finishing.
The present invention is carried out microalloying from micro Mo, Cr, Nb, Ti alloy, passed through by rational Alloying Design
Relaxation ultra-rapid cooling technology controlling and process microstructure after controlled rolling, the hydrodynamics effect of alloy is given full play to, reduces alloy
Addition and precious alloy usage amount, and simplify and out-line quenching, tempering process carried out after traditional abrasion-resistant stee hot rolling, adopt
With the method compared with traditional handicraft, energy consumption is reduced, shortens technological process, reduces alloy addition, after rolling directly
The quenching degree of steel plate reheats quenching technical than tradition and increases 1.4~1.5 times after ultra-rapid cooling, improves the tough of steel and matches somebody with somebody
Than saving social resources, reducing production cost.
With reference to embodiment, the invention will be further described, not limiting the scope of the invention.
Embodiment 1
A kind of method for producing NM360 steel.The chemical composition and its content of strand be：C is 0.18wt%, and Si is
0.25wt%, Mn 1.5wt%, Mo 0.20wt%, Cr 0.25wt%, Nb 0.03wt%, Ti 0.01wt%, P are
0.01wt%, S<0.001wt%, remaining is Fe and inevitable impurity.Described hot rolling technology is：By thickness 150mm steel
Base is heated at 1200 DEG C, is rolled using roughing+finish rolling two-stage control, and roughing uses high temperature heavy reduction rolling, carries out 5 altogether
Passes, each passes amount are respectively 21mm, 21mm, 21mm, 21mm, 21mm, and reduction in pass is more than 15mm, and roughing goes out
1100 DEG C of temperature of mouth, final rolling temperature start as 912 DEG C, and last 3 passage of finish rolling uses small percentage pass reduction, percentage pass reduction difference
For 3.7%, 2.5%, 1.1%, final thickness 16mm, 795 DEG C of exit temperature at finishing, relaxation 30s after the completion of finish rolling, enter the excess of imports
Quickly cooling device, cooldown rate are 68 DEG C/s, are cooled to 300 DEG C, are aligned subsequently into heat rectification machine, it is ensured that plate shape meets
Client technologies protocol requirement, its yield strength are 958MPa, tensile strength 1120MPa, A50 elongation percentage 18.5%, surface Bu Shi
Hardness 362HBW, under the conditions of -20 DEG C, Charpy V-arrangement ballistic work is respectively 47J, 52J, 60J, and its performance meets NM360 national standards
GB/T24186-2009 technical conditions.
Embodiment 2
A kind of method for producing NM360 steel.The chemical composition and its content of strand be：C is 0.18wt%, and Si is
0.25wt%, Mn 1.5wt%, Mo 0.20wt%, Cr 0.25wt%, Nb 0.03wt%, Ti 0.01wt%, P are
0.01wt%, S<0.001wt%, remaining is Fe and inevitable impurity.Described hot rolling technology is：By thickness 150mm steel
Base is heated at 1200 DEG C, is rolled using roughing+finish rolling two-stage control, and roughing uses high temperature heavy reduction rolling, carries out 5 altogether
Passes, each passes amount are respectively 25mm, 24mm, 20mm, 20mm, 20mm, and reduction in pass is more than 15mm, and roughing goes out
1095 DEG C of temperature of mouth, final rolling temperature start as 915 DEG C, and last 3 passage of finish rolling uses small percentage pass reduction, percentage pass reduction difference
For 3.6%, 2.4%, 1.3%, final thickness 8mm, 790 DEG C of exit temperature at finishing, relaxation 35s after the completion of finish rolling, enter the excess of imports
Quickly cooling device, cooldown rate are 82 DEG C/s, are cooled to 280 DEG C, are aligned subsequently into heat rectification machine, it is ensured that plate shape meets
It is required that its yield strength is 976MPa, and tensile strength 1186MPa, A50 elongation percentage 19%, surface Brinell hardness 365HBW, -20
Under the conditions of DEG C, Charpy V-arrangement ballistic work is respectively 53J, 58J, 66J, and its performance meets NM360 standard GB/Ts/T24186-2009
Technical conditions.
Embodiment 3
A kind of method for producing NM360 steel.The chemical composition and its content of strand be：C is 0.16wt%, and Si is
0.25wt%, Mn 1.5wt%, Mo 0.25wt%, Cr 0.20wt%, Nb 0.025wt%, Ti 0.012wt%, P
For 0.012wt%, S<0.002wt%, remaining is Fe and inevitable impurity.Described hot rolling technology is：By thickness 150mm
Heating steel billet is rolled at 1200 DEG C using roughing+finish rolling two-stage control, and roughing uses high temperature heavy reduction rolling, entered altogether
The passes of row 5, each passes amount are respectively 21mm, 21mm, 21mm, 21mm, 21mm, and reduction in pass is more than 15mm, slightly
1100 DEG C of outlet temperature is rolled, final rolling temperature starts as 912 DEG C, and last 3 passage of finish rolling uses small percentage pass reduction, percentage pass reduction
Respectively 3.7%, 2.5%, 1.1%, final thickness 16mm, 785 DEG C of exit temperature at finishing, relaxation 36s after the completion of finish rolling, enter
Enter Ultrafast cooling device, cooldown rate is 68 DEG C/s, is cooled to 300 DEG C, is aligned subsequently into heat rectification machine, it is ensured that plate shape
Meet client technologies protocol requirement, its yield strength is 954MPa, tensile strength 1132MPa, A50 elongation percentage 17.5%, surface
Brinell hardness 354HBW, under the conditions of -20 DEG C, Charpy V-arrangement ballistic work is respectively 42J, 48J, 53J, and its performance meets NM360 countries
Standard GB/T24186-2009 technical conditions.
Embodiment 4
A kind of method for producing NM360 steel.The chemical composition and its content of strand be：C is 0.16wt%, and Si is
0.25wt%, Mn 1.5wt%, Mo 0.25wt%, Cr 0.20wt%, Nb 0.025wt%, Ti 0.012wt%, P
For 0.012wt%, S<0.002wt%, remaining is Fe and inevitable impurity.Described hot rolling technology is：By thickness 150mm
Heating steel billet is rolled at 1200 DEG C using roughing+finish rolling two-stage control, and roughing uses high temperature heavy reduction rolling, entered altogether
The passes of row 5, each passes amount are respectively 25mm, 24mm, 20mm, 20mm, 20mm, and reduction in pass is more than 15mm, slightly
1085 DEG C of outlet temperature is rolled, final rolling temperature starts as 908 DEG C, and last 3 passage of finish rolling uses small percentage pass reduction, percentage pass reduction
Respectively 3.6%, 2.4%, 1.3%, final thickness 8mm, 795 DEG C of exit temperature at finishing, relaxation 33s after the completion of finish rolling, enter
Enter Ultrafast cooling device, cooldown rate is 82 DEG C/s, is cooled to 300 DEG C, is aligned subsequently into heat rectification machine, it is ensured that plate shape
Meet the requirements, its yield strength is 972MPa, tensile strength 1193MPa, A50 elongation percentage 18.5%, surface Brinell hardness
366HBW, under the conditions of -20 DEG C, Charpy V-arrangement ballistic work is respectively 55J, 59J, 68J, its performance meet NM360 standard GB/Ts/
T24186-2009 technical conditions.
Although content disclosed above shows the exemplary embodiment of the present invention, it should be noted that without departing substantially from power
On the premise of profit requires the scope of the present invention of restriction, it may be many modifications and change.It is real according to invention described herein
The function, step and/or action for applying the claim to a method of example are not required to perform with any particular order.In addition, the although present invention
Element can describe or require in the form of individual, be unless explicitly limited odd number it is also contemplated that multiple.
It is described although being described above with reference to figure according to each embodiment of the present invention, people in the art
Member can also do it should be appreciated that each embodiment proposed to the invention described above on the basis of present invention is not departed from
Go out various improvement.Therefore, protection scope of the present invention should be determined by the content of appended claims.
Claims (1)
- A kind of 1. method for producing NM360 steel, it is characterised in that including step：Molten iron and steel scrap are subjected to continuous casting, hot rolling after pneumatic steelmaking, ladle refining furnace refining and the refining of RH vacuum circulation degassings After obtain NM360 steel；Wherein, the chemical composition of strand and its content are：C is 0.18wt%, and Si 0.25wt%, Mn are 1.5wt%, Mo 0.20wt%, Cr 0.25wt%, Nb 0.03wt%, Ti 0.01wt%, P 0.01wt%, S< 0.001wt%, remaining is Fe and impurity；Wherein, hot rolling technology flow includes：By thickness 150mm heating steel billets to 1200 DEG C, using roughing+finish rolling two-stage control Rolling, roughing use high temperature heavy reduction rolling, carries out 5 passage roughing altogether and rolls, each passes amount be respectively 21mm, 21mm, 21mm, 21mm, 21mm, reduction in pass are more than 15mm, and 1100 DEG C of roughing outlet temperature, final rolling temperature starts as 912 DEG C, last 3 passage of finish rolling uses small percentage pass reduction, and percentage pass reduction is respectively 3.7%, 2.5%, 1.1%, and final thickness is 16mm, 795 DEG C, relaxation 30s after the completion of finish rolling of exit temperature at finishing, into Ultrafast cooling device, cooldown rate is 68 DEG C/s, 300 DEG C are cooled to, is aligned subsequently into heat rectification machine, then is sheared, examined, finishing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610208029.8A CN105861939B (en) | 2016-04-01 | 2016-04-01 | A kind of method for producing NM360 steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610208029.8A CN105861939B (en) | 2016-04-01 | 2016-04-01 | A kind of method for producing NM360 steel |
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| CN105861939A CN105861939A (en) | 2016-08-17 |
| CN105861939B true CN105861939B (en) | 2017-12-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106929634B (en) * | 2017-03-31 | 2019-08-20 | 华南理工大学 | The method of continuous casting and rolling technique of sheet bar production thin gauge abrasion-resistant stee |
| CN107099727B (en) * | 2017-03-31 | 2019-01-18 | 华南理工大学 | A kind of method of ultrafast cold press quenching production thin gauge abrasion-resistant stee NM400 |
| CN107099730B (en) * | 2017-03-31 | 2018-09-14 | 华南理工大学 | A kind of manufacturing method of the high Ti anti-wear steel NM360s of Thin Specs |
| CN107099731B (en) * | 2017-03-31 | 2018-06-22 | 华南理工大学 | A kind of method of the press quenching production high Ti anti-wear steel NM360s of Thin Specs |
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| CN102828117A (en) * | 2012-09-03 | 2012-12-19 | 南京钢铁股份有限公司 | Low-yield ratio high-intensity hot-rolled double-phase steel plate and production method thereof |
| CN104818435B (en) * | 2015-03-13 | 2017-01-25 | 北京科技大学 | Preparation method for NM400 grade wear-resistant steel plate with corrosion resistance |
| CN104962834B (en) * | 2015-06-14 | 2017-01-18 | 秦皇岛首秦金属材料有限公司 | High-toughness stable-brinell-hardness extra-thick abrasion-resistant steel and preparation method thereof |
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