CN108103396A - It is a kind of for manganese molybdenum-vanadium steel iron material of high-strength bolt and preparation method thereof - Google Patents
It is a kind of for manganese molybdenum-vanadium steel iron material of high-strength bolt and preparation method thereof Download PDFInfo
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- CN108103396A CN108103396A CN201711238027.4A CN201711238027A CN108103396A CN 108103396 A CN108103396 A CN 108103396A CN 201711238027 A CN201711238027 A CN 201711238027A CN 108103396 A CN108103396 A CN 108103396A
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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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- 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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
-
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
Abstract
The invention discloses a kind of manganese molybdenum-vanadium steel iron material for high-strength bolt, the chemical element component and its mass percent contained includes：Carbon 0.39 0.46%, silicon 0.15 0.30%, manganese 1.45 1.60%, phosphorus≤0.015%, sulphur≤0.015%, molybdenum 0.35 0.45%, nickel≤0.25%, copper≤0.25%, titanium 0.04 0.10%, boron 0.0005 0.0025%, vanadium 0.15 0.30%, niobium 0.05 0.10%, aluminium 0.03 0.08%, surplus is iron.The material possesses good processability and quenching degree, and multiple element acts synergistically, and can effectively improve the intensity and toughness of steel.The preparation method of the steel material is also disclosed, using Bof and external refining, is equipped with continuous casting technology, it is ensured that its chemical Composition Control is in scope of design.
Description
Technical field
The invention belongs to high-intensity fasteners technical field more particularly to a kind of manganese molybdenum-vanadium steel iron for high-strength bolt
Material and preparation method thereof.
Background technology
At present, high-strength bolt manufacturing technology in China's rests on 12.9 grades of hierarchy level.National current standard GB/
T3098.1 has only provided 12.9 and level below bolt mechanical performance index, and 12.9 grades or more high-strength bolts are not required；
Fastener material specified in standard GB/T/T6478, GB/T3077, performance can reach 12.9 grades of levels, but cannot reach
To 14.9 grades of performance requirement of higher level.China 14.9 grades and higher level high-strength bolt material and technology at this stage
Still in space state.For example, alloys in common use steel 35CrMo and 42CrMo be cannot take into account reach 14.9 grades intensity, toughness and
The guarantee of the comprehensive mechanical properties index such as plasticity, particularly low-temperature flexibility and elevated temperature strength.
Prior art manufacture 14.9 grade bolt of high intensity can be ensured by two approach：When material therefor into
Bolt Essential Performance Requirements can be reached by being grouped into；Second is that high-strength bolt design requirement is realized by certain process,
Ensure that bolt reaches 14.9 grade high-strengths.
Reach the indexs such as intensity, yield ratio, the plasticity of 14.9 grade bolt comprehensive mechanical property of high intensity, bolt is special
Completed in equipment manufacture stylized process be：Heat treatment → cold-drawn → intermediate heat-treatment → the cold-drawn of hot rolling wire → once → in
Between the processing of the processes such as heat treatment → cold-heading → processing screw thread → final heat treatment.Wherein, cold-drawn and cold-heading molding requirement high intensity
14.9 grade bolt materials possess excellent processing performance, and existing bolt steel material is all difficult to reach the requirement.At this stage
Cold-drawn cold-heading processing is not adapted to for the material generally existing plasticity of processing bolt, it is necessary to carry out intermediate heat-treatment to recover to mould
Property, process is more, high energy consumption, and the cycle is long.
The content of the invention
The technical problems to be solved by the invention are to overcome the shortcomings of to mention in background above technology and defect, provide one
Kind is for manganese molybdenum-vanadium steel iron material of 14.9 grade high-strength bolts and preparation method thereof.
In order to solve the above technical problems, technical solution proposed by the present invention is to provide a kind of steel for high-strength bolt
Material, the chemical element component and its mass percent contained include (being shown in Table 1)：Carbon 0.39-0.46%, silicon 0.15-
0.30%th, manganese 1.45-1.60%, phosphorus≤0.015%, sulphur≤0.015%, molybdenum 0.35-0.45%, nickel≤0.25%, copper≤
0.25%th, titanium 0.04-0.10%, boron 0.0005-0.0025%, vanadium 0.15-0.30%, niobium 0.05-0.10%, aluminium 0.03-
0.08%, surplus is iron.
Table 1：The chemical element component (mass percent) of the steel material of high-strength bolt of the present invention
The present invention adds in 1.45-1.60%Mn in steel can effectively improve obdurability, quenching degree and the wearability of steel, so
And the superheated susceptivity and temper brittleness of steel can be increased by adding in Mn, the present invention is by adding in crystal grain thinning element 0.35-0.45%
Mo, 0.15-0.30%V, 0.04-0.10%Ti etc. overcome the problems, such as this, and Mo can also significantly reduce steel superheated susceptivity and tempering
Brittleness.B in steel has stable overcooling austenite to act on, and adds in 0.0005-0.0025%B and can reach the effect for improving quenching degree；B
Quenching degree and intensity are more favorably improved with Mo collective effects.Add in 0.04-0.10%Ti elements can crystal grain thinning, enhance the modeling of steel
Property and toughness, while the advantageous effect of B can be promoted；Adding in micro Nb has good Grain refinement, improves the ductility of steel
With the obdurability of steel, Nb and B has certain compound action, generates strong inhibitory action to austenite transformation, can improve steel
Impact flexibility and reduce its brittle transition temperature.V can crystal grain thinning, improve the intensity and yield ratio of steel；V can reduce quenching degree
And toughness, often used with Mn, Cr, Mo.Al is mainly used to deoxidation, retain in steel 0.03-0.08% Al can with crystal grain thinning, carry
The toughness of high steel at low temperature.
A variety of micro alloying elements are added in steel, the purpose is to grain ultrafinings, and steel of the present invention is made to possess good prolong
Malleability is conducive to cold-heading molding processing, has excellent comprehensive mechanical property after quenched tempering.
The above-mentioned manganese molybdenum-vanadium steel iron material for high-strength bolt, it is preferred that its chemical element component and its matter for containing
Amount percentage includes：Carbon 0.40-0.44%, silicon 0.20-0.25%, manganese 1.45-1.56%, phosphorus≤0.011%, sulphur≤
0.014%th, molybdenum 0.38-0.43%, nickel≤0.25%, copper≤0.24%, titanium 0.06-0.09%, boron 0.0017-0.0022%,
Vanadium 0.15-0.20%, niobium 0.07-0.09%, aluminium 0.04-0.07%, surplus are iron.
(1) steel is added in oxygen top-blown converter and smelted, after adding in ferro-aluminum, the strong deoxidation of ferrosilicon before tapping, added in
Vanadium iron, ferromanganese and ferrotitanium smelting continue deoxidation, add ferro-boron and realize partially-alloyed, tapping after the completion of smelting；
(2) obtained liquid steel the outer ladle refining of stove will be carried out after the step (1) tapping, by molybdenum and niobium during ladle refining
Alloy ore or alloy cpd are added thereto after being mixed by chemical element mass percent；
(3) the liquid steel obtained after the step (2) ladle refining is subjected to direct casting；
(4) steel obtained after the step (3) is cast carries out hot rolling；
(5) by the steel obtained after the step (4) hot rolling by spheroidizing after, carry out final heat treatment to get to institute
The steel material stated.
Above-mentioned preparation method, it is preferred that in the step (1), carbon, nickel, copper, phosphorus, sulphur and ferro element derive from steel
Iron.
Preferably, in the step (1), the control of the temperature of converter smelting is at 1600 DEG C~1660 DEG C, the temperature control of tapping
System is at 1580 DEG C~1600 DEG C.
Preferably, in the step (2), the temperature of the outer ladle refining of stove is controlled at 1540 DEG C~1570 DEG C.
Preferably, in the step (3), the temperature of direct casting is controlled at 1500 DEG C~1520 DEG C.
Preferably, in the step (4), hot rolling includes heating period, rolling sequence and finish to gauge stage.
It is furthermore preferred that the heating period temperature control of the hot rolling is at 1150 DEG C~1200 DEG C, the temperature of the rolling sequence
At 1100 DEG C~1140 DEG C, the temperature in the finish to gauge stage is controlled at 860 DEG C~900 DEG C for degree control.
Preferably, in the step (5), the concrete operations of spheroidizing include the following steps：By the steel of rolled 710
DEG C~740 DEG C of heat preservation 8-12h, it is furnace-cooled to 450 DEG C~500 DEG C and comes out of the stove.
Preferably, in the step (5), final heat treatment includes heating quenching stage and tempering stage, the quenching rank
At 830 DEG C~860 DEG C, the temperature of tempering stage is controlled at 360 DEG C~450 DEG C the heating and temperature control of section.
Compared with prior art, beneficial effects of the present invention are：
1st, the present invention is used for the steel material of high-strength bolt, by controlling carbon content, adds a variety of alloying elements, makes it
With grain ultrafining, possesses good processability and quenching degree, multiple element acts synergistically, and can effectively improve the intensity of steel
And toughness, it solves the problems, such as in background technology, has filled up the blank of domestic high-strength tenacity bolt material.
2nd, preparation method of the invention, is advanced smelting technique, using ladle essence outside Bof and stove
Refining, is equipped with continuous casting technology, it is ensured that its chemical Composition Control, especially can be by the content of harmful components sulphur, phosphorus in scope of design
It is accurately controlled in respectively within 0.015%.
3rd, preparation method of the invention employs continuous casting technology, and continuous casting technology is an elder generation the direct castable of molten steel
Into technology, compared with conventional method, continuous casting technology, which has, greatly improves recovery rate of iron and slab quality, and energy saving grade is notable
Advantage.
Specific embodiment
It is of the invention for the ease of understanding, the present invention is done below in conjunction with preferred embodiment and more comprehensively, is meticulously described,
But protection scope of the present invention is not limited to specific examples below.
Unless otherwise defined, all technical terms used hereinafter are generally understood meaning phase with those skilled in the art
Together.Technical term used herein is intended merely to the purpose of description specific embodiment, is not intended to the limitation present invention's
Protection domain.
Unless otherwise specified, various raw material, reagent, the instrument and equipment etc. used in the present invention can pass through city
Field is commercially available or can be prepared by existing method.
Embodiment 1：
A kind of steel material for high-strength bolt of the present invention, the chemical element component contained and its quality percentage
Than including：Carbon 0.44%, silicon 0.23%, manganese 1.56%, phosphorus 0.010%, sulphur 0.012%, molybdenum 0.43%, nickel 0.25%, copper
0.24%th, titanium 0.06%, boron 0.0022%, vanadium 0.20%, niobium 0.07%, aluminium 0.05%, surplus are iron.
Its preparation method includes the following steps：
(1) steel is added in oxygen top-blown converter and smelted, carbon, nickel, copper, phosphorus, sulphur and ferro element derive from steel
Iron after adding in ferro-aluminum, the strong deoxidation of ferrosilicon before tapping, adds in vanadium iron, ferromanganese and ferrotitanium smelting and continues deoxidation, adds ferro-boron realization
It is partially-alloyed, it taps after the completion of smelting；At 1600 DEG C~1660 DEG C, the temperature control of tapping exists for the temperature control of converter smelting
1580 DEG C~1600 DEG C；
(2) obtained liquid steel the outer ladle refining of stove will be carried out after the step (1) tapping, by molybdenum and niobium during ladle refining
Alloy ore or alloy cpd are added thereto after being mixed by chemical element mass percent；The temperature control of the outer ladle refining of stove
At 1540 DEG C~1570 DEG C；
(3) the liquid steel obtained after the step (2) ladle refining is subjected to direct casting, the temperature control of direct casting exists
1500 DEG C~1520 DEG C；
(4) steel obtained after the step (3) is cast carries out hot rolling, and hot rolling includes heating period, rolling sequence and end
It rolls the stage, at 1150 DEG C~1200 DEG C, the temperature of rolling sequence is controlled at 1100 DEG C for the heating period temperature control of the hot rolling
~1140 DEG C, the temperature in finish to gauge stage is controlled at 860 DEG C~900 DEG C；
(5) steel obtained after the step (4) hot rolling is subjected to spheroidizing, by the steel of rolled at 710 DEG C~740 DEG C
8-12h is kept the temperature, 450 DEG C~500 DEG C is furnace-cooled to and comes out of the stove, final heat treatment is carried out, including heating quenching stage and tempering stage, institute
The heating and temperature control of hardening phase is stated at 830 DEG C~860 DEG C, the temperature control of tempering stage 360 DEG C~450 DEG C to get
To the steel material.
Embodiment 2：
A kind of steel material for high-strength bolt of the present invention, the chemical element component contained and its quality percentage
Than including：Carbon 0.42%, silicon 0.20%, manganese 1.45%, phosphorus 0.009%, sulphur 0.014%, molybdenum 0.40%, nickel 0.24%, copper
0.19%th, titanium 0.09%, boron 0.0017%, vanadium 0.15%, niobium 0.09%, aluminium 0.04%, surplus are iron.
Its preparation method includes the following steps：
(1) steel is added in oxygen top-blown converter and smelted, carbon, nickel, copper, phosphorus, sulphur and ferro element derive from steel
Iron after adding in ferro-aluminum, the strong deoxidation of ferrosilicon before tapping, adds in vanadium iron, ferromanganese and ferrotitanium smelting and continues deoxidation, adds ferro-boron realization
It is partially-alloyed, it taps after the completion of smelting；At 1600 DEG C~1660 DEG C, the temperature control of tapping exists for the temperature control of converter smelting
1580 DEG C~1600 DEG C；
(2) obtained liquid steel the outer ladle refining of stove will be carried out after the step (1) tapping, by molybdenum and niobium during ladle refining
Alloy ore or alloy cpd are added thereto after being mixed by chemical element mass percent；The temperature control of the outer ladle refining of stove
At 1540 DEG C~1570 DEG C；
(3) the liquid steel obtained after the step (2) ladle refining is subjected to direct casting, the temperature control of direct casting exists
1500 DEG C~1520 DEG C；
(4) steel obtained after the step (3) is cast carries out hot rolling, and hot rolling includes heating period, rolling sequence and end
It rolls the stage, at 1150 DEG C~1200 DEG C, the temperature of rolling sequence is controlled at 1100 DEG C for the heating period temperature control of the hot rolling
~1140 DEG C, the temperature in finish to gauge stage is controlled at 860 DEG C~900 DEG C；
(5) steel obtained after the step (4) hot rolling is subjected to spheroidizing, by the steel of rolled at 710 DEG C~740 DEG C
8-12h is kept the temperature, 450 DEG C~500 DEG C is furnace-cooled to and comes out of the stove, final heat treatment is carried out, including heating quenching stage and tempering stage, institute
The heating and temperature control of hardening phase is stated at 830 DEG C~860 DEG C, the temperature control of tempering stage 360 DEG C~450 DEG C to get
To the steel material.
Embodiment 3：
A kind of steel material for high-strength bolt of the present invention, the chemical element component contained and its quality percentage
Than including：Carbon 0.40%, silicon 0.25%, manganese 1.50%, phosphorus 0.011%, sulphur 0.010%, molybdenum 0.38%, nickel 0.20%, copper
0.20%th, titanium 0.08%, boron 0.0020%, vanadium 0.18%, niobium 0.08%, aluminium 0.07%, surplus are iron.
Its preparation method includes the following steps：
(1) steel is added in oxygen top-blown converter and smelted, carbon, nickel, copper, phosphorus, sulphur and ferro element derive from steel
Iron after adding in ferro-aluminum, the strong deoxidation of ferrosilicon before tapping, adds in vanadium iron, ferromanganese and ferrotitanium smelting and continues deoxidation, adds ferro-boron realization
It is partially-alloyed, it taps after the completion of smelting；At 1600 DEG C~1660 DEG C, the temperature control of tapping exists for the temperature control of converter smelting
1580 DEG C~1600 DEG C；
(2) obtained liquid steel the outer ladle refining of stove will be carried out after the step (1) tapping, by molybdenum and niobium during ladle refining
Alloy ore or alloy cpd are added thereto after being mixed by chemical element mass percent；The temperature control of the outer ladle refining of stove
At 1540 DEG C~1570 DEG C；
(3) the liquid steel obtained after the step (2) ladle refining is subjected to direct casting, the temperature control of direct casting exists
1500 DEG C~1520 DEG C；
(4) steel obtained after the step (3) is cast carries out hot rolling, and hot rolling includes heating period, rolling sequence and end
It rolls the stage, at 1150 DEG C~1200 DEG C, the temperature of rolling sequence is controlled at 1100 DEG C for the heating period temperature control of the hot rolling
~1140 DEG C, the temperature in finish to gauge stage is controlled at 860 DEG C~900 DEG C；
(5) steel obtained after the step (4) hot rolling is subjected to spheroidizing, by the steel of rolled at 710 DEG C~740 DEG C
8-12h is kept the temperature, 450 DEG C~500 DEG C is furnace-cooled to and comes out of the stove, final heat treatment is carried out, including heating quenching stage and tempering stage, institute
The heating and temperature control of hardening phase is stated at 830 DEG C~860 DEG C, the temperature control of tempering stage 360 DEG C~450 DEG C to get
To the steel material.
The steel material of above-mentioned 3 embodiments is by above-mentioned preparation method, using smart outside Bof and stove
Refining, is equipped with continuous casting process, ensures that its chemical Composition Control (is shown in Table 2) in scope of design.Quenched time of obtained steel material
After fire, its mechanical property is detected, as shown in table 3.
Table 2：The chemical element component (mass percent) of the steel material for high-strength bolt of embodiment 1-3
Table 3：Mechanical property shows after the quenched tempering of steel material that embodiment 1-3 is obtained
Note：The data of each embodiment are the average value of three samples in table.
Bolt performance rate explanation：Bolt grade mark is made of two parts number, and first portion's digital representation nominal resists
10 times of the ratio of the 1/100 of tensile strength, second portion digital representation nominal yield point and Nominal Tensile.Such as：Mark
For 14.9 grades of bolt, Nominal Tensile >=1400MPa, yield ratio >=0.9.
Table 3 the result shows that, the present invention for 14.9 grade high-strength bolts steel material through the present invention preparation method
After processing, tensile strength and yield ratio have reached 14.9 grade high-strength bolt requirements, and it is good to illustrate that steel material has in itself
Processability and quenching degree, plasticity is good, efficiently solve the problems, such ass in background technology.
Claims (10)
1. a kind of manganese molybdenum-vanadium steel iron material for high-strength bolt, which is characterized in that its chemical element component contained and its
Mass percent includes：Carbon 0.39-0.46%, silicon 0.15-0.30%, manganese 1.45-1.60%, phosphorus≤0.015%, sulphur≤
0.015%th, molybdenum 0.35-0.45%, nickel≤0.25%, copper≤0.25%, titanium 0.04-0.10%, boron 0.0005-0.0025%,
Vanadium 0.15-0.30%, niobium 0.05-0.10%, aluminium 0.03-0.08%, surplus are iron.
2. the manganese molybdenum-vanadium steel iron material of high-strength bolt to be used for according to claim 1, which is characterized in that its chemistry contained
Elemental composition and its mass percent include：Carbon 0.40-0.44%, silicon 0.20-0.25%, manganese 1.45-1.56%, phosphorus≤
0.011%th, sulphur≤0.014%, molybdenum 0.38-0.43%, nickel≤0.25%, copper≤0.24%, titanium 0.06-0.09%, boron
0.0017-0.0022%, vanadium 0.15-0.20%, niobium 0.07-0.09%, aluminium 0.04-0.07%, surplus are iron.
3. a kind of preparation method of the steel material according to claim 1 or claim 2 for high-strength bolt, including walking as follows
Suddenly：
(1) steel is added in oxygen top-blown converter and smelted, after adding in ferro-aluminum, the strong deoxidation of ferrosilicon before tapping, addition vanadium iron,
Ferromanganese and ferrotitanium smelting continue deoxidation, add ferro-boron and realize partially-alloyed, tapping after the completion of smelting；
(2) obtained liquid steel the outer ladle refining of stove will be carried out after the step (1) tapping, by molybdenum and the alloy of niobium during ladle refining
Ore or alloy cpd are added thereto after being mixed by chemical element mass percent；
(3) the liquid steel obtained after the step (2) ladle refining is subjected to direct casting；
(4) steel obtained after the step (3) is cast carries out hot rolling；
(5) by the steel obtained after the step (4) hot rolling by spheroidizing after, carry out final heat treatment to get to described
Steel material.
4. preparation method according to claim 3, which is characterized in that in the step (1), the temperature control of converter smelting
At 1600 DEG C~1660 DEG C, the temperature of tapping is controlled at 1580 DEG C~1600 DEG C.
5. preparation method according to claim 3, which is characterized in that in the step (2), the temperature of the outer ladle refining of stove
Control is at 1540 DEG C~1570 DEG C.
6. preparation method according to claim 3, which is characterized in that in the step (3), the temperature control of direct casting
At 1500 DEG C~1520 DEG C.
7. preparation method according to claim 3, which is characterized in that in the step (4), hot rolling include the heating period,
Rolling sequence and finish to gauge stage.
8. preparation method according to claim 7, which is characterized in that the heating period temperature of the hot rolling is controlled 1150
DEG C~1200 DEG C, at 1100 DEG C~1140 DEG C, the temperature in the finish to gauge stage is controlled 860 for the temperature control of the rolling sequence
DEG C~900 DEG C.
9. preparation method according to claim 3, which is characterized in that in the step (5), the concrete operations of spheroidizing
Include the following steps：The steel of rolled is kept the temperature into 8-12h at 710 DEG C~740 DEG C, 450 DEG C~500 DEG C is furnace-cooled to and comes out of the stove.
10. according to the preparation method any one of claim 3-9, which is characterized in that in the step (5), final heat
Processing includes heating quenching stage and tempering stage, and the heating and temperature control of the hardening phase is at 830 DEG C~860 DEG C, tempering
The temperature in stage is controlled at 360 DEG C~450 DEG C.
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| CN201711238027.4A CN108103396A (en) | 2017-11-30 | 2017-11-30 | It is a kind of for manganese molybdenum-vanadium steel iron material of high-strength bolt and preparation method thereof |
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| CN201711238027.4A CN108103396A (en) | 2017-11-30 | 2017-11-30 | It is a kind of for manganese molybdenum-vanadium steel iron material of high-strength bolt and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110106443A (en) * | 2019-05-30 | 2019-08-09 | 山东寿光巨能特钢有限公司 | A kind of superhigh intensity bolt round-bar pass method |
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