CN1017351B - Heat treatment method for preparing fine-grain dual-phase steel - Google Patents
Heat treatment method for preparing fine-grain dual-phase steelInfo
- Publication number
- CN1017351B CN1017351B CN88104276A CN88104276A CN1017351B CN 1017351 B CN1017351 B CN 1017351B CN 88104276 A CN88104276 A CN 88104276A CN 88104276 A CN88104276 A CN 88104276A CN 1017351 B CN1017351 B CN 1017351B
- Authority
- CN
- China
- Prior art keywords
- steel
- quenching
- heating
- phase
- heated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 19
- 229910000885 Dual-phase steel Inorganic materials 0.000 title abstract description 13
- 238000010791 quenching Methods 0.000 claims abstract description 64
- 230000000171 quenching effect Effects 0.000 claims abstract description 58
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 49
- 239000010959 steel Substances 0.000 claims abstract description 49
- 230000006698 induction Effects 0.000 claims abstract description 21
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 14
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 12
- 229910000851 Alloy steel Inorganic materials 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- 239000007921 spray Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 8
- 206010037660 Pyrexia Diseases 0.000 claims description 6
- 239000013078 crystal Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 5
- 238000005485 electric heating Methods 0.000 abstract 1
- 238000005728 strengthening Methods 0.000 abstract 1
- 238000007669 thermal treatment Methods 0.000 description 5
- 238000005098 hot rolling Methods 0.000 description 4
- 230000008570 general process Effects 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 229910000754 Wrought iron Inorganic materials 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- -1 reinforcing bar Inorganic materials 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The present invention uses the induction heating quenching and contact electric heating quenching heat treatment method to make continuous or integral double-phase zone quenching heat treatment of low-carbon low-alloy steel material (including steel bar, wire tube and strip) to obtain fine-grain double-phase steel material with ferrite and martensite double-phase structure, and said steel material can be directly cold-deformed into high-strength steel wire, steel bar, steel pipe, steel strip and high-strength bolt, etc. with plastic strength. The cold formability, the deformation strengthening capability, the grain size and other characteristics of the steel are superior to those of the common furnace heat treatment dual-phase steel. And has the advantages of low cost, energy saving and no pollution.
Description
The present invention relates to a kind of heat treating method of producing two-phase steel with fine crystal grain.
Ferrite and martensite dual-phase steel are a kind of new type steels that grows up the nearly more than ten years.This steel be with low-carbon (LC) (＜0.15%C) and low alloy steel (the district's thermal treatment of α+γ) obtains ferrite and martensite duplex structure, and its performance characteristics is intensity height (σ b=60-70kgf/mm through special two-phase
2), low (the σ 0.2=30-40kgf/mm of yield-point
2), plasticity good (δ=25-30%, ψ＞50%) has good cold formability and working hardening effect, is used widely.
Usually there are two approach in steel acquisition ferrite and martensite duplex structure: the one, and steel carry out controlled rolling and controlled cooling and obtain duplex structure when Metallurgical Factory's hot rolling, are referred to as hot-rolled dual-phase steel; Another is general hot rolling material to be carried out two-phase (two-phase of district's heating anneal of α+γ) or quenching is handled and obtained duplex structure, then is called the thermal treatment dual phase steel.
The two-phase of general thermal treatment dual phase steel is handled and is manyly carried out batch processing or handle continuously with process furnace, but time-consuming, power consumption, performance is stable inadequately and cost is high.U.S. Pat 4296919, Canadian Patent CA1136825 proposes with continuous oven steel to be carried out two-phase and handles, and the present invention then proposes with induction heating or contacts electrically heated method the low-carbon and low-alloy steel are carried out the two-phase processing.The patent that also has such as Japanese Patent J84045731 and European patent EP 194708 etc., propose with induction heating or contact electrically heated method to steel quench, general thermal treatments such as normalizing or tempering.The present invention proposes with induction heating or contact electricity heating low-carbon low-alloy steel to be carried out diphasic fever to handle, especially propose the continuous two-phase that steel carry out twice heating and quenching successively to be handled the two-phase steel of the different original structures that available can be superior with two cover heating and quenching device.(seeing Table 1), and have cost low, save time, energy-conservation, free of contamination advantage.
The present invention is to containing (weight percent) C:0.05～0.15% with induction heating continuous quenching or the method that electrically contacts whole heating quenching; Mn:0.6～2.5%, the low-carbon low-alloy steel of Si:0.5～1.0% carry out primary quenching or the secondary quenching diphasic fever is handled to obtain having the two-phase steel with fine crystal grain material of ferrite and martensite duplex structure.
Description of drawings:
Fig. 1 is induction heating primary quenching device and process schematic representation.(1) be ruhmkorff coil, (2) are water spray ring, and (3) are steel.
Fig. 2 is duplex structure's photo that the induction heating primary quenching obtains.（SEM）1500×
Fig. 3 be general stove heat treated duplex structure (SEM) 1500 *
Fig. 4 is induction heating secondary quenching device and process schematic representation.(4) be a load coil, (5) are the primary quenching water spray ring.(6) be the secondary quenching ruhmkorff coil, (7) are the secondary water spray ring.
When Fig. 5 is the processing of induction heating secondary quenching, whole martensitic stuctures that quenching for the first time obtains.（SEM）1500×
The duplex structure that Fig. 6 quenches for the second time and obtains when being the processing of induction heating secondary quenching.（SEM）1500×
The general stove of Fig. 7 heating secondary quenching duplex structure, (SEM) 1500 *
Concrete technology of the present invention is respectively:
(1). with the method for high frequency intermediate frequency or line-frequency induction heating continuous quenching, low-carbon low-alloy steel steel to above-mentioned special component scope (comprise that steel wire, rod iron, reinforcing bar, steel pipe and steel band etc. once quench or Qa two-phase is processed, to obtain having the two-phase steel steel of ferrite and martensite duplex structure.
Primary quenching:
The steel of hot rolling attitude original structure are overlapped load coil and water spray ring by one continuously, steel are heated to ferrite (α) and austenite (γ) two-phase region continuously and enter water spray ring immediately quench, show as Fig. 1.Heating and temperature control can obtain about 80% ferrite+about 20% martensite (martensite is sheet in small, broken bits) and show as Fig. 2 during in Ac1+20～50 ℃.And crystal grain is thinner than general process furnace processing, sees Fig. 3.Its performance also is better than the dual phase steel that general process furnace is handled, and is as shown in table 1.
Secondary quenching:
The steel of hot rolling attitude original structure are overlapped load coil and water spray rings by two continuously, as shown in Figure 4.First cover is heated to more than the Ac3 20～40 ℃ austenite one phase district continuously with steel, enters water spray ring immediately, is quenched to whole martensites, as shown in Figure 5.Be that original structure enters second covering device with this martensitic stucture immediately, steel are heated to the ferrite+austenitic two-phase region of Ac1+20～50 ℃, enter water spray ring immediately and quench, obtain ferrite+martensitic stucture.It is fibrous that martensite is, and sees Fig. 6.Crystal grain is significantly less than the duplex structure that general stove is handled, and compares as Fig. 6 and Fig. 7.Its performance is better than the dual phase steel of general stove heat treated, and also better than the performance with the duplex structure of this method primary quenching.(seeing Table 1).
Primary quenching or Qa processing parameter are heated in above-mentioned induction continuously, and required Heating temperature and saturating burning time are that power consumption parameter and steel were controlled by the time of induction heating and quenching device.This two-phase processing is to realize by the continuous heating and the continuous quenching of steel.
For example as follows by the speed of induction heating device: high-frequency induction heating apparatus electrical parameter: high pressure: 12KV, plate current: 1.5A, grid current 0.4A with the electrical parameter and the steel of the processing of high-frequency induction quenching two-phase.
Steel are by the speed of ruhmkorff coil and quenching water spray ring:
Primary quenching: load coil width 50mm, by 6 seconds time;
Secondary quenching: primary quenching load coil width 50mm, by 15 seconds time;
Secondary quenching load coil width 20mm is similarly 15 seconds by the time.
(2). the low-carbon low-alloy steel steel (mainly being rod iron, steel pipe etc.) of above-mentioned special component scope are carried out primary quenching or Qa diphasic fever is handled with the contact electricity heating means, processing parameter, resulting microstructure and property is similar with the processing of induction quenching two-phase, is whole heating quenching.
Primary quenching is heated to the whole contact electricity of steel that (two-phase region of α+γ), temperature are controlled at Ac1+20～50 and ℃ carry out secondary quenching.
Secondary quenching for the first time is heated to the γ phase region with the whole contact electricity of steel, and heating and temperature control is quenched fully in Ac3+20～40 ℃, and then is heated to that (phase region of α+γ), temperature are controlled at Ac1+20～50 and ℃ carry out secondary quenching.
The low-carbon and low-alloy steel of handling with the present invention can direct cold deformation become high-intensity steel wire, reinforcing bar, steel pipe and high strength bolt etc., its intensity, plasticity, and cold formability and working hardening ability, characteristics such as grain fineness number are better than the heat treated dual phase steel of general stove.And has low, energy-conservation, a free of contamination advantage of cost.
The dual phase steel performance that table 1 obtains with heat treating method of the present invention is handled the dual phase steel performance that obtains with general stove and is compared
Intensity yield extension reduction of area
Limit limit rate rate
σb σ0.2 δ ψ
KN/mm
2KN/mm
2% %
The primary quenching 0.72 0.43 19.25 54.6 that general process furnace is handled
Dual phase steel secondary quenching 0.74 0.42 20.2 60.6
The primary quenching 0.75 0.50 20.1 69.6 that induction heating is handled
Dual phase steel secondary quenching 0.78 0.50 20.3 71.6
Embodiment: see Table 2
Table 2 adopts the composition and the performance table look-up of induction heating temperature, steel
Claims (3)
1, a kind of to containing (weight percent) C: 0.05～0.15%; Si: 0.5～1.0%, Mn: 0.5～2.5% low-carbon (LC), low alloy steel carry out diphasic fever to be handled to obtain the heat treating method of two-phase steel with fine crystal grain, it is characterized in that using induction heating continuous quenching or contact electricity heating quenching method that described steel is carried out primary quenching or secondary quenching.
2,, it is characterized in that adopting high, intermediate frequency or line-frequency induction heating continuous quenching method carries out primary quenching or Qa concrete technology is respectively according to the described diphasic fever treatment process of claim 1:
A) primary quenching: with cover ruhmkorff coil and a water spray ring steel are heated to continuously (two-phase region of α+γ), heating and temperature control are in Ac1+20～50 ℃, and spray quenching immediately obtains ferrite and martensite duplex structure,
B) secondary quenching: with two cover ruhmkorff coil and water spray rings, first cover is heated to γ phase single phase region continuously with steel, heating and temperature control is in Ac3+20～40 ℃, quench fully, steel are heated to continuously (the two-phase region of α+γ) with second covering device immediately then, heating and temperature control is carried out the second time and is quenched in Ac1+20～50 ℃, obtains ferrite and martensitic stucture.
According to the described diphasic fever treatment process of claim 1, it is characterized in that 3, the concrete technology that adopts contact electricity heating quenching method to carry out primary quenching or twice quenching is respectively:
A) primary quenching: the whole contact electricity of steel is heated to (two-phase region of α+γ), heating and temperature control quench then immediately in Ac1+20～50 ℃,
B) secondary quenching: for the first time the whole contact electricity of steel is heated to the γ single phase region, heating and temperature control is quenched fully in Ac3+20～40 ℃, is heated to then that (phase region of α+γ), temperature are controlled at Ac1+20～50 ℃, carry out secondary quenching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN88104276A CN1017351B (en) | 1988-07-16 | 1988-07-16 | Heat treatment method for preparing fine-grain dual-phase steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN88104276A CN1017351B (en) | 1988-07-16 | 1988-07-16 | Heat treatment method for preparing fine-grain dual-phase steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1039621A CN1039621A (en) | 1990-02-14 |
| CN1017351B true CN1017351B (en) | 1992-07-08 |
Family
ID=4832947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN88104276A Expired CN1017351B (en) | 1988-07-16 | 1988-07-16 | Heat treatment method for preparing fine-grain dual-phase steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1017351B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100348767C (en) * | 2005-12-27 | 2007-11-14 | 东北大学 | Strength of extension 750-795 MPa grade double-phase steel plate and mfg. method thereof |
| CN1330785C (en) * | 2005-12-27 | 2007-08-08 | 东北大学 | Strength of extension 1000 MPa grade complex phase steel plate and mfg. method thereof |
| CN100357474C (en) * | 2006-02-17 | 2007-12-26 | 东北大学 | Tensile strength 600Mpa grade dual phase steel plate and its production method |
| CN100357475C (en) * | 2006-02-17 | 2007-12-26 | 东北大学 | Tensile strength 540Mpa grade dual phase steel plate and its production method |
| EP2468904B1 (en) | 2009-08-21 | 2017-10-11 | Nippon Steel & Sumitomo Metal Corporation | Method for manufacturing thick-walled seamless steel pipe |
| CN101801125B (en) * | 2010-03-12 | 2012-09-05 | 冯伟年 | Induction heater, induction heating treatment equipment and induction heating treatment method |
| CN102876965B (en) * | 2012-09-11 | 2014-12-03 | 中国钢研科技集团有限公司 | High-strength anchor bolt and production method thereof |
| CN106048412B (en) * | 2016-06-29 | 2018-04-27 | 宝山钢铁股份有限公司 | A kind of manufacture method of phase transformation strengthening cold working high strength steel, steel pipe and steel pipe |
| CN107557556A (en) * | 2017-10-25 | 2018-01-09 | 苏州华丰不锈钢紧固件有限公司 | A kind of quenching technical of high-strength bolt |
-
1988
- 1988-07-16 CN CN88104276A patent/CN1017351B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1039621A (en) | 1990-02-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| ES8703530A1 (en) | Controlled rolling process for dual phase steels and application to rod, wire, sheet and other shapes. | |
| CN1017351B (en) | Heat treatment method for preparing fine-grain dual-phase steel | |
| JPH04268016A (en) | Production of high tensile strength steel sheet for door guide bar having excellent crushing characteristic | |
| CN102400049B (en) | 490-grade fire-resistant steel plate for building structure and manufacturing method thereof | |
| JPS61177326A (en) | Manufacture of wire rod for wire having high strength as well as weatherability | |
| JPS62228431A (en) | Manufacture of wire rod for long-sized high tension steel wire | |
| US3502514A (en) | Method of processing steel | |
| JPH04276018A (en) | Manufacture of door guard bar excellent in collapse resistant property | |
| JP3482053B2 (en) | Stainless steel for heat-resistant spring and method of manufacturing the same | |
| CN104531965A (en) | Method for heat treatment of high-plasticity low-yield-ratio concrete reinforcing bars | |
| JPH04276042A (en) | Austenitic stainless steel and its production | |
| JPH0813028A (en) | Production of precipitation hardening steel material having high tensile strength and high toughness | |
| JPS602364B2 (en) | Manufacturing method of non-thermal high tensile strength steel plate with excellent low-temperature toughness | |
| JPS552785A (en) | Manufacture of high tensile steel excellent in delayed crackableness | |
| Pradhan et al. | Characteristics of high-strength cold-rolled sheet steels produced by continuous annealing | |
| JPS59153841A (en) | Production of high-tension electric welded steel pipe having uniform strength | |
| JP2804278B2 (en) | Direct softening wire rod manufacturing method | |
| KR100435460B1 (en) | A method for manufacturing steel wire for steel cord | |
| JP2815028B2 (en) | Method for producing steel pipe having yield point elongation, low yield ratio and excellent low temperature toughness | |
| JPS6220820A (en) | Cold working method | |
| CN113737102A (en) | Steel plate and production method thereof | |
| JPS6347354A (en) | High strength wire rod having superior ductility and relaxation characteristic and its manufacture | |
| JP3823336B2 (en) | Method for producing high-tensile cold-rolled steel sheet having deep drawability | |
| KR940007370B1 (en) | Method of manufacturing steel pipe | |
| JPH07228919A (en) | Heat treatment method for base stock for structural use |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |