CN108018487A - A kind of vanadium niobium boron steel iron material for high-strength bolt and preparation method thereof - Google Patents

A kind of vanadium niobium boron steel iron material for high-strength bolt and preparation method thereof Download PDF

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Publication number
CN108018487A
CN108018487A CN201711240552.XA CN201711240552A CN108018487A CN 108018487 A CN108018487 A CN 108018487A CN 201711240552 A CN201711240552 A CN 201711240552A CN 108018487 A CN108018487 A CN 108018487A
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steel
preparation
temperature control
vanadium
niobium
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叶振宇
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Hunan Platinum Standard Parts Manufacturing Co Ltd
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Hunan Platinum Standard Parts Manufacturing Co Ltd
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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
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/32—Soft annealing, e.g. spheroidising
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • 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
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • 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
    • C22C38/06—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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
    • 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • 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
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • 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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • 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
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • 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
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese

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  • Organic Chemistry (AREA)
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  • Crystallography & Structural Chemistry (AREA)
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Abstract

The invention discloses a kind of vanadium niobium boron steel iron material for high-strength bolt, its chemical element component contained and its mass percent include：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%, chromium 1.25 1.40%, nickel≤0.25%, copper≤0.25%, 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

A kind of vanadium niobium boron steel iron material for high-strength bolt and preparation method thereof
Technical field
The invention belongs to high-intensity fasteners technical field, more particularly to a kind of vanadium niobium boron 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 more than 12.9 grades high-strength bolts are not required； Fastener material specified in standard GB/T/T6478, GB/T3077, its 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 property 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, high-strength bolt design requirement is realized by certain process, Ensure that bolt reaches 14.9 grade high-strengths.
Reach the indexs such as the intensity, yield ratio, 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 process such as heat treatment → cold-heading → processing screw thread → final heat treatment.Wherein, cold-drawn and cold-heading molding require 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 Material generally existing plasticity for processing bolt does not adapt to cold-drawn cold-heading processing, it is necessary to carries out intermediate heat-treatment to recover to mould Property, process is more, high energy consumption, cycle length.
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, there is provided one Kind is used for 14.9 grade high-strength bolts and not steel material of titaniferous and preparation method thereof.
In order to solve the above technical problems, technical solution proposed by the present invention is a kind of steel for high-strength bolt of offer Material, its chemical element component contained and its mass percent 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%, chromium 1.25-1.40%, nickel≤ 0.25%th, copper≤0.25%, 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 1.40-1.60%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 Mn, the present invention is by adding crystal grain thinning element 0.35-0.45% Mo, 0.15-0.30%V, 1.25-1.40%Cr etc. overcome the problem, and Mo can also significantly reduce steel superheated susceptivity and tempering Brittleness.B in steel has stable overcooling austenite to act on, and adds 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.It is polynary and important to add roles of the 1.25-1.40%Cr in steel, Cr The superheated susceptivity of steel can be reduced, the carbide of Cr has high intensity, hardness, yield point and high wearability, can effectively carry The comprehensive mechanical property of high quenched and tempered steel, and there is corrosion stability.Adding micro Nb has good Grain refinement, improves The ductility of steel and the obdurability of steel, Nb and B have certain compound action, and producing strong suppression to austenite transformation makees With can improve the impact flexibility of steel and reduce its brittle transition temperature.V can crystal grain thinning, improve the intensity and yield ratio of steel；V Quenching degree and toughness can be reduced, is often used with Mn, Cr, Mo.Al is mainly used to deoxidation, and the Al that 0.03-0.08% is retained in steel can With crystal grain thinning, improve the toughness of steel at low temperature.
A variety of micro alloying elements are added in steel, the purpose is to grain ultrafining, steel of the present invention is possessed good prolong Malleability, is conducive to cold-heading molding processing, has excellent comprehensive mechanical property after quenched tempering.
The above-mentioned vanadium niobium boron steel iron material for high-strength bolt, it is preferred that its chemical element component and its matter for containing Amount percentage includes：Carbon 0.42-0.45%, silicon 0.18-0.22%, manganese 1.45-1.55%, phosphorus≤0.011%, sulphur≤ 0.011%th, molybdenum 0.38-0.44%, chromium 1.26-1.34%, nickel≤0.23%, copper≤0.25%, boron 0.0008-0.0010%, Vanadium 0.15-0.20%, niobium 0.06-0.07%, aluminium 0.05-0.07%, surplus are iron.
Based on a total inventive concept, the present invention correspondingly provides a kind of vanadium niobium boron steel iron material for high-strength bolt The preparation method of material, includes the following steps：
(1) steel is added in oxygen top-blown converter and is smelted, after adding ferro-aluminum, the strong deoxidation of ferrosilicon before tapping, added Vanadium iron and ferromanganese smelting continue deoxidation, add ferro-boron and realize partially-alloyed, tap after the completion of smelting；
(2) obtained liquid steel will carry out the outer ladle refining of stove after the step (1) tapping, during ladle refining by molybdenum, chromium and The alloy ore or alloy cpd of niobium 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, that is, obtain 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 temperature control 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 control of the outer ladle refining of stove is at 1540 DEG C~1570 DEG C.
Preferably, in the step (3), the temperature control of direct casting is 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 Degree control is at 1100 DEG C~1140 DEG C, and the temperature control in the finish to gauge stage is at 860 DEG C~900 DEG C.
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 insulation 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 The heating and temperature control of section is at 830 DEG C~860 DEG C, and the temperature control of tempering stage is at 360 DEG C~450 DEG C.
Compared with prior art, beneficial effects of the present invention are：
1st, the present invention is used for the vanadium niobium boron steel iron material of high-strength bolt, by controlling carbon content, adds a variety of alloy members Element, makes it have grain ultrafining, possesses good processability and quenching degree, multiple element synergistic effect, can effectively improve The intensity and toughness of steel, solve the problems, such as in background technology, have 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, saves energy etc. significantly Advantage.
Embodiment
For the ease of understanding the present invention, 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 that implication 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 vanadium niobium boron steel iron material for high-strength bolt of the invention, its chemical element component and its matter for containing Amount percentage includes：Carbon 0.45%, silicon 0.22%, manganese 1.55%, phosphorus 0.008%, sulphur 0.010%, molybdenum 0.44%, chromium 1.26%th, nickel 0.20%, copper 0.20%, boron 0.0010%, vanadium 0.20%, niobium 0.07%, aluminium 0.07%, surplus are iron.
Its preparation method includes the following steps：
(1) steel is added in oxygen top-blown converter and is smelted, carbon, nickel, copper, phosphorus, sulphur and ferro element derive from steel Iron, after adding ferro-aluminum, the strong deoxidation of ferrosilicon before tapping, adds vanadium iron and ferromanganese smelting continues deoxidation, add ferro-boron and realize part Alloying, taps after the completion of smelting；The temperature control of converter smelting is at 1600 DEG C~1660 DEG C, and the temperature control of tapping is 1580 DEG C~1600 DEG C；
(2) obtained liquid steel will carry out the outer ladle refining of stove after the step (1) tapping, during ladle refining by molybdenum, chromium and The alloy ore or alloy cpd of niobium are added thereto after being mixed by chemical element mass percent；The temperature of the outer ladle refining of stove Control is 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 Roll the stage, the heating period temperature control of the hot rolling is at 1150 DEG C~1200 DEG C, and the temperature control of rolling sequence is at 1100 DEG C ~1140 DEG C, the temperature control in finish to gauge stage is 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, carries out final heat treatment, 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 is at 360 DEG C~450 DEG C, to obtain the final product To the steel material.
Embodiment 2：
A kind of vanadium niobium boron steel iron material for high-strength bolt of the invention, its chemical element component and its matter for containing Amount percentage includes：Carbon 0.42%, silicon 0.20%, manganese 1.45%, phosphorus 0.010%, sulphur 0.009%, molybdenum 0.40%, chromium 1.30%th, nickel 0.16%, copper 0.25%, boron 0.0010%, vanadium 0.15%, niobium 0.06%, aluminium 0.05%, surplus are iron.
Its preparation method includes the following steps：
(1) steel is added in oxygen top-blown converter and is smelted, carbon, nickel, copper, phosphorus, sulphur and ferro element derive from steel Iron, after adding ferro-aluminum, the strong deoxidation of ferrosilicon before tapping, adds vanadium iron and ferromanganese smelting continues deoxidation, add ferro-boron and realize part Alloying, taps after the completion of smelting；The temperature control of converter smelting is at 1600 DEG C~1660 DEG C, and the temperature control of tapping is 1580 DEG C~1600 DEG C；
(2) obtained liquid steel will carry out the outer ladle refining of stove after the step (1) tapping, during ladle refining by molybdenum, chromium and The alloy ore or alloy cpd of niobium are added thereto after being mixed by chemical element mass percent；The temperature of the outer ladle refining of stove Control is 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 Roll the stage, the heating period temperature control of the hot rolling is at 1150 DEG C~1200 DEG C, and the temperature control of rolling sequence is at 1100 DEG C ~1140 DEG C, the temperature control in finish to gauge stage is 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, carries out final heat treatment, 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 is at 360 DEG C~450 DEG C, to obtain the final product To the steel material.
Embodiment 3：
A kind of vanadium niobium boron steel iron material for high-strength bolt of the invention, its chemical element component and its matter for containing Amount percentage includes：Carbon 0.42%, silicon 0.18%, manganese 1.50%, phosphorus 0.011%, sulphur 0.011%, molybdenum 0.38%, chromium 1.34%th, nickel 0.23%, copper 0.15%, boron 0.0008%, vanadium 0.18%, niobium 0.07%, aluminium 0.06%, surplus are iron.
Its preparation method includes the following steps：
(1) steel is added in oxygen top-blown converter and is smelted, carbon, nickel, copper, phosphorus, sulphur and ferro element derive from steel Iron, after adding ferro-aluminum, the strong deoxidation of ferrosilicon before tapping, adds vanadium iron and ferromanganese smelting continues deoxidation, add ferro-boron and realize part Alloying, taps after the completion of smelting；The temperature control of converter smelting is at 1600 DEG C~1660 DEG C, and the temperature control of tapping is 1580 DEG C~1600 DEG C；
(2) obtained liquid steel will carry out the outer ladle refining of stove after the step (1) tapping, during ladle refining by molybdenum, chromium and The alloy ore or alloy cpd of niobium are added thereto after being mixed by chemical element mass percent；The temperature of the outer ladle refining of stove Control is 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 Roll the stage, the heating period temperature control of the hot rolling is at 1150 DEG C~1200 DEG C, and the temperature control of rolling sequence is at 1100 DEG C ~1140 DEG C, the temperature control in finish to gauge stage is 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, carries out final heat treatment, 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 is at 360 DEG C~450 DEG C, to obtain the final product 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 numeral, and Part I digital representation nominal resists 10 times of the ratio of the 1/100 of tensile strength, Part II digital representation nominal yield point and Nominal Tensile.Such as：Mark For 14.9 grades of bolt, its Nominal Tensile >=1400MPa, yield ratio >=0.9.
Table 3 the result shows that, the present invention be used 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, the problem of efficiently solving in background technology.

Claims (10)

  1. A kind of 1. vanadium niobium boron steel iron material for high-strength bolt, it is characterised 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%, chromium 1.25-1.40%, nickel≤0.25%, copper≤0.25%, boron 0.0005-0.0025%, Vanadium 0.15-0.30%, niobium 0.05-0.10%, aluminium 0.03-0.08%, surplus are iron.
  2. 2. it is used for the vanadium niobium boron steel iron material of high-strength bolt according to claim 1, it is characterised in that its chemistry contained Elemental composition and its mass percent include：Carbon 0.42-0.45%, silicon 0.18-0.22%, manganese 1.45-1.55%, phosphorus≤ 0.011%th, sulphur≤0.011%, molybdenum 0.38-0.44%, chromium 1.26-1.34%, nickel≤0.23%, copper≤0.25%, boron 0.0008-0.0010%, vanadium 0.15-0.20%, niobium 0.06-0.07%, aluminium 0.05-0.07%, surplus are iron.
  3. 3. a kind of preparation method of vanadium niobium boron steel iron material according to claim 1 or claim 2, includes the following steps：
    (1) steel is added in oxygen top-blown converter and is smelted, after adding ferro-aluminum, the strong deoxidation of ferrosilicon before tapping, add vanadium iron Continue deoxidation with ferromanganese smelting, add ferro-boron and realize partially-alloyed, tap 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, chromium 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, that is, obtain described Steel material.
  4. 4. preparation method according to claim 3, it is characterised in that in the step (1), the temperature control of converter smelting At 1600 DEG C~1660 DEG C, the temperature control of tapping is at 1580 DEG C~1600 DEG C.
  5. 5. preparation method according to claim 3, it is characterised 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. 6. preparation method according to claim 3, it is characterised in that in the step (3), the temperature control of direct casting At 1500 DEG C~1520 DEG C.
  7. 7. preparation method according to claim 3, it is characterised in that in the step (4), hot rolling include the heating period, Rolling sequence and finish to gauge stage.
  8. 8. preparation method according to claim 7, it is characterised in that the heating period temperature control of the hot rolling is 1150 DEG C~1200 DEG C, the temperature control of the rolling sequence is at 1100 DEG C~1140 DEG C, and the temperature control in the finish to gauge stage is 860 DEG C~900 DEG C.
  9. 9. preparation method according to claim 3, it is characterised 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. 10. according to the preparation method any one of claim 3-9, it is characterised 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 control in stage is at 360 DEG C~450 DEG C.
CN201711240552.XA 2017-11-30 2017-11-30 A kind of vanadium niobium boron steel iron material for high-strength bolt and preparation method thereof Pending CN108018487A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101243197A (en) * 2005-10-31 2008-08-13 杰富意钢铁株式会社 High-strength steel excellent in delayed fracture resistance characteristics and metal bolts
CN107002193A (en) * 2014-11-18 2017-08-01 新日铁住金株式会社 Steel wire rolling bar steel or rolled wire

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101243197A (en) * 2005-10-31 2008-08-13 杰富意钢铁株式会社 High-strength steel excellent in delayed fracture resistance characteristics and metal bolts
CN107002193A (en) * 2014-11-18 2017-08-01 新日铁住金株式会社 Steel wire rolling bar steel or rolled wire

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
夏家群: "《节能监测技术》", 31 January 2016, 冶金工业出版社 *

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