AU2019381076B2 - Q690D thick plate produced by ultra fast cooling process and manufacturing method - Google Patents

Q690D thick plate produced by ultra fast cooling process and manufacturing method Download PDF

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AU2019381076B2
AU2019381076B2 AU2019381076A AU2019381076A AU2019381076B2 AU 2019381076 B2 AU2019381076 B2 AU 2019381076B2 AU 2019381076 A AU2019381076 A AU 2019381076A AU 2019381076 A AU2019381076 A AU 2019381076A AU 2019381076 B2 AU2019381076 B2 AU 2019381076B2
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rapid
super
thick plate
cooling process
cooling
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AU2019381076A1 (en
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Zhonghua HOU
Hui Jiang
Zaiwei JIANG
Qiangjun YAN
Qinghui Zhang
Yijie ZHANG
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Nanjing Iron and Steel Co Ltd
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Nanjing Iron and Steel 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following 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
    • C22C38/04—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
    • C22C38/18—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
    • C22C38/26—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
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with 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
    • 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

Abstract

Disclosed in the present invention is a Q690D thick plate produced by an ultra fast cooling process, related to the technical field of metallurgy, having the following chemical components and mass percentages thereof: C: 0.05%-0.10%, Si: 0.20%-0.50%, Mn: 1.40%-1.80%, P ≤ 0.020%, S ≤ 0.003%, Cr: 0.10%-0.50%, Mo: 0.08%-0.30%, Ti: 0.008%-0.030%, Nb: 0.015%-0.050%, B: 0.0008%-0.0025%, Ceq ≤ 0.43, and the remainder being Fe and unavoidable contaminants. The present invention uses low-carbon and alloying component design, providing a high-strength Q690D steel thick plate, the production process having a simple flow, rapid production rhythm and low cost.

Description

Q690D THICK PLATE PRODUCED BY ULTRA FAST COOLING PROCESS AND MANUFACTURING METHOD
TECHNICAL FIELD
The present invention relates to the field of metallurgical technology, in particular to a super-rapid-cooling process produced Q690D thick plate and a manufacturing method.
BACKGROUND ART With the continuous rapid development of China's coal industry, the coal mining machinery is developing towards large tonnage and large thickness, and the demand for thick plates of high-strength steel is increasing. Many domestic steel mills produce Q690D thick plates by offline quenching and tempering. The production process is long, the alloy content is high, the cost is high, and the carbon equivalent is high and it is difficult to weld.
SUMMARY OF THE INVENTION In an attempt to solve the above technical problems, the present invention provides a super-rapid-cooling process produced Q690D thick plate, wherein it comprises the following chemical components by mass percentage: C: 0.05%-0.10%, Si: 0.20%-0.50%, Mn: 1.40%-1.80 %, P: <0.020%, S: <0.003%, Cr: 0.10%-0.50%, Mo: 0.08%-0.30%, Ti: 0.008%-0.030%, Nb: 0.015%-0.050%, B: 0.0008%-0.0025%, Ceq: <0.43, and the balance is Fe and unavoidable impurities.
Technical effects: The present invention adopts low-carbon and alloyed component design, and provides a high-strength steel Q690D thick plate through the interaction of alloy elements such as carbon, manganese, chromium, molybdenum, etc. and microalloy elements such as niobium, titanium, vanadium etc. The production process is simple, the production is efficient, and the cost is low.
The technical solution further limited by the present invention is as follows:
The aforementioned super-rapid-cooling process produced Q690D thick plate, wherein it comprises the following chemical components by mass percentage: C: 0.07%, Si: 0.27%, Mn: 1.55%, P: 0.017%, S: 0.0015%, Cr: 0.20%, Mo: 0.11%, Ti: 0.015%, Nb: 0.028%, B: 0.0015%, Ceq: 0.39%, and the balance is Fe and unavoidable impurities.
The aforementioned super-rapid-cooling process produced Q690D thick plate, wherein it comprises the following chemical components by mass percentage: C: 0.08%, Si: 0.25%, Mn: 1.51%, P: 0.014%, S: 0.0019%, Cr: 0.18%, Mo: 0.10%, Ti: 0.017%, Nb: 0.021%, B: 0.0016%, Ceq: 0.40%, and the balance is Fe and unavoidable impurities.
The aforementioned super-rapid-cooling process produced Q690D thick plate, wherein the thickness of the obtained steel plate is 50mm.
The present invention also attempts to provide a method for manufacturing a super-rapid-cooling process produced Q690D thick plate, wherein it comprises carrying out desulfurization pretreatment on molten iron, smelting in a converter, refining LF and RH, continuously casting, performing slow-cooling on the blanks, heating the casting blanks, dephosphorizing, rolling, cooling, carrying out flaw detection, shot blasting, tempering, straightening, cutting and sampling, spray printing logos, inspecting and storing, wherein the molten steel is subjected to continuous casting after vacuum degassing, and the casting blanks are heated to 1,180°C-1,240°C and then rolled in austenite recrystallization zone and non-recrystallization zone respectively, the pass reduction rate of rolling in the recrystallization zone is above 12% and the final rolling temperature is above 980°C; the cumulative reduction rate of rolling in the non-recrystallization zone is above 50%, the initial rolling temperature is below 900°C, and the final rolling temperature is above 800°C, the super-rapid-cooling process is adopted after rolling, the super-rapid-cooling roll speed is 0.40m/s, and the water volume is 13,000 m2 /h-15,000m 2/h, swinging is reciprocated for 3 times, and the self-tempering temperature is below 200°C, tempering heat treatment is performed after super-rapid cooling, and the tempering temperature is 580°C-630°C.
The aforementioned method for manufacturing a super-rapid-cooling process produced Q690D thick plate, wherein the thickness of the continuous cast blanks is 260mm.
The aforementioned method for manufacturing a super-rapid-cooling process produced Q690D thick plate, wherein the thickness of the thick plate obtained is 50mm.
The beneficial effects of the present invention are as follows:
(1) The structure of the steel plate obtained in the present invention is tempered sorbite, with a yield strength of greater than 690MPa, a tensile strength of 770MPa-93MPa, an elongation after fracture of greater than 35%, and an impact toughness at -20°C of greater than 150J;
(2) The present invention produces 50mm thick high-strength steel with yield strength of 690MPa by super-rapid-cooling process and tempering heat treatment, with simple production process, efficient production, strong applicability and low cost;
(3) The high-strength steel plate obtained by the present invention has a low carbon equivalent Ceq<0.43, and has good welding performance.
DETAILED DESCRIPTION Embodiment 1
A 50mm thick super-rapid-cooling process produced Q690D steel plate provided by this embodiment, wherein it comprises the following chemical components by mass percentage: C: 0.07%, Si: 0.27%, Mn: 1.55%, P: 0.017%, S: 0.0015%, Cr: 0.20%, Mo: 0.11%, Ti: 0.015%, Nb: 0.028%, B: 0.0015%, Ceq: 0.39%, and the balance is Fe and unavoidable impurities.
The main production processes comprise carrying out desulfurization pretreatment on molten iron, smelting in a converter, refining LF and RH, continuously casting, performing slow-cooling on the blanks, heating the casting blanks, dephosphorizing, rolling, cooling, carrying out flaw detection, shot blasting, tempering, straightening, cutting and sampling, spray printing logos, inspecting and storing.
The molten steel is subjected to continuous casting after vacuum degassing treatment. The thickness of the continuous cast blanks is 260mm. The blanks are heated at 1,180°C to 1,240°C and then rolled in the austenite recrystallization zone and non-recrystallization zone respectively. Due to the thick thickness of the plate, in order to ensure the self-tempering temperature required by the program after rolling, the reciprocating water cooling process is adopted. The steel plate reciprocates 3 times in the super-rapid-cooling section, and the final self-tempering temperature accurately meets the program requirements.
The pass reduction rate of rolling in the recrystallization zone is above 12% and the final rolling temperature is above 980°C; the cumulative reduction rate of rolling in the non-recrystallization zone is above 50%, the initial rolling temperature is 865°C, and the final rolling temperature is 850°C. The super-rapid-cooling process is adopted after rolling, wherein the water inlet temperature is 810°C, the super-rapid-cooling roll speed is 0.40m/s, the water volume is 13,500m2/h, the swinging is reciprocated 3 times, and the self-tempering temperature is 200°C. After super-rapid-cooling, it is subjected to tempering heat treatment, wherein the tempering temperature is 610°C, and the time in furnace is 173min.
Embodiment 2
A 50mm thick super-rapid-cooling process produced Q690D steel plate provided by this embodiment, wherein it comprises the following chemical components by mass percentage: C: 0.08%, Si: 0.25%, Mn: 1.51%, P: 0.014%, S: 0.0019%, Cr: 0.18%, Mo: 0.10%, Ti: 0.017%, Nb: 0.021%, B: 0.0016%, Ceq:
0.40%, and the balance is Fe and unavoidable impurities.
The main production processes comprise carrying out desulfurization pretreatment on molten iron, smelting in a converter, refining LF and RH, continuously casting, performing slow-cooling on the blanks, heating the casting blanks, dephosphorizing, rolling, cooling, carrying out flaw detection, shot blasting, tempering, straightening, cutting and sampling, spray printing logos, inspecting and storing.
The molten steel is subjected to continuous casting after vacuum degassing treatment. The thickness of the continuous cast blanks is 260mm. The blanks are heated at 1,180°C to 1,240°C and then rolled in the austenite recrystallization zone and non-recrystallization zone respectively. Due to the thick thickness of the plate, in order to ensure the self-tempering temperature required by the program after rolling, the reciprocating water cooling process is adopted. The steel plate reciprocates 3 times in the super-rapid-cooling section, and the final self-tempering temperature accurately meets the program requirements.
The pass reduction rate of rolling in the recrystallization zone is above 12% and the final rolling temperature is above 980°C; the cumulative reduction rate of rolling in the non-recrystallization zone is above 50%, the initial rolling temperature is 872°C, and the final rolling temperature is 855°C. The super-rapid-cooling process is adopted after rolling, wherein the water inlet temperature is 808°C, the super-rapid-cooling roll speed is 0.40m/s, the water volume is 14100m2/h, the swinging is reciprocated 3 times, and the self-tempering temperature is 180°C. After super-rapid-cooling, it is subjected to tempering heat treatment, wherein the tempering temperature is 615°C, and the time in furnace is 175min.
The mechanical properties of the steel plates obtained in Embodiment 1 and Embodiment 2 were tested. The strength test was conducted according to the GB/T228-2002 metal material tensile test method at room temperature, and the low-temperature impact toughness test was conducted according to the GB/T 229-2007 Metal Charpy V-notch impact test method. The results obtained are shown in the following table:
Sample No. ReL/MPa Rm/MPa A50/% Akv(longitudinal Remarks at -20°C)/J
1 729 807 44 204 thickness
2 739 793 43 191 thickness It can be seen from the table that the performance index of the high-strength steel obtained in the present invention is greater than 690Mpa, tensile strength is 770MPa-93OMPa, elongation after fracture is greater than 35%, and impact toughness at -20°C is greater than 150J. It can be seen that the Q690D steel plate designed in the present invention has high strength and good extensibility, at the same time has good low-temperature impact toughness, is simple in process, and can be applied to coal mine machinery hydraulic supports.
In addition to the above-described embodiments, the present invention may include other embodiments. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.
The reference to any prior art in this specification is not, and should not be taken as, an acknowledgement or any form of suggestion that such prior art forms part of the common general knowledge.
It will be understood that the terms "comprise" and "include" and any of their derivatives (e.g. comprises, comprising, includes, including) as used in this specification, and the claims that follow, is to be taken to be inclusive of features to which the term refers, and is not meant to exclude the presence of any additional features unless otherwise stated or implied.
In some cases, a single embodiment may, for succinctness and/or to assist in understanding the scope of the disclosure, combine multiple features. It is to be understood that in such a case, these multiple features may be provided separately
(in separate embodiments), or in any other suitable combination. Alternatively, where separate features are described in separate embodiments, these separate features may be combined into a single embodiment unless otherwise stated or implied. This also applies to the claims which can be recombined in any combination. That is a claim may be amended to include a feature defined in any other claim. Further a phrase referring to "at least one of' a list of items refers to any combination of those items, including single members. As an example, "at least one of: a, b, or c" is intended to cover: a, b, c, a-b, a-c, b-c, and a-b-c.

Claims (7)

THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:
1. A super-rapid-cooling process produced Q690D thick plate, wherein it comprises the following chemical components by mass percentage: C: 0.05%-0.10%, Si: 0.20%-0.50%, Mn: 1.40%-1.80 %, P: <0.020%, S:50.003%, Cr: 0.10%-0.50%, Mo: 0.08%-0.30%, Ti: 0.008%-0.030% , Nb: 0.015%-0.050%, B: 0.0008%-0.0025 %, Ceq: <0.43, and the balance is Fe and unavoidable impurities.
2. The super-rapid-cooling process produced Q690D thick plate according to claim 1, wherein it comprises the following chemical components by mass percentage: C: 0.07%, Si: 0.27%, Mn: 1.55%, P: 0.017%, S: 0.0015%, Cr: 0.20%, Mo: 0.11%, Ti: 0.015%, Nb: 0.028%, B: 0.0015%, Ceq: 0.39%, and the balance is Fe and unavoidable impurities.
3. The super-rapid-cooling process produced Q690D thick plate according to claim 1, wherein it comprises the following chemical components by mass percentage: C: 0.08%, Si: 0.25%, Mn: 1.51%, P: 0.014%, S: 0.0019%, Cr: 0.18%, Mo: 0.10%, Ti: 0.017%, Nb: 0.021%, B: 0.0016%, Ceq: 0.40%, and the balance is Fe and unavoidable impurities.
4. The super-rapid-cooling process produced Q690D thick plate according to any one of claims 1 to 3, wherein the thickness of the obtained steel plate is 50mm.
5. A method for manufacturing a super-rapid-cooling process produced Q690D thick plate, wherein it comprises carrying out desulfurization pretreatment on molten iron, smelting in a converter, refining LF and RH, continuously casting, performing slow-cooling on the blanks, heating the casting blanks, dephosphorizing, rolling, cooling, carrying out flaw detection, shot blasting, tempering, straightening, cutting and sampling, spray printing logos, inspecting and storing, wherein the molten steel is subjected to continuous casting after vacuum degassing, and the continuous cast blanks are heated to 1,180°C-1,240°C and then rolled in austenite recrystallization zone and non-recrystallization zone respectively, the pass reduction rate of rolling in the recrystallization zone is above 12% and the final rolling temperature is above 980°C; the cumulative reduction rate of rolling in the non-recrystallization zone is above 50%, the initial rolling temperature is below 900°C, and the final rolling temperature is above 800°C, the super-rapid-cooling process is adopted after rolling, the super-rapid-cooling roll speed is 0.40m/s, and the water volume is 13,OOOm2/h-15,000m 2 /h, swinging is reciprocated for 3 times, and the self-tempering temperature is below 200°C, tempering heat treatment is performed after super-rapid cooling, and the tempering temperature is 580°C-630°C.
6. The method for manufacturing a super-rapid-cooling process produced Q690D thick plate according to claim 5, wherein the thickness of the continuous cast blanks is 260mm.
7. The method for manufacturing a super-rapid-cooling process produced Q690D thick plate according to any one of claims 5 to 6, wherein the thickness of the thick plate obtained is 50mm.
AU2019381076A 2018-11-12 2019-06-28 Q690D thick plate produced by ultra fast cooling process and manufacturing method Active AU2019381076B2 (en)

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CN201811342554.4A CN109338225A (en) 2018-11-12 2018-11-12 The ultrafast cold technique production Q690D slab of one kind and manufacturing method
PCT/CN2019/093665 WO2020098288A1 (en) 2018-11-12 2019-06-28 Q690d thick plate produced by ultra fast cooling process and manufacturing method

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CN111876558B (en) * 2020-07-21 2022-04-22 安阳钢铁股份有限公司 Method for producing peritectic high-strength steel based on LF + VD process and accurately controlling carbon content
CN113770176A (en) * 2021-06-29 2021-12-10 张家港宏昌钢板有限公司 Visual material tracking method and system for online identification of flaw detection plate and representative plate
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CN114480969B (en) * 2022-01-24 2023-04-18 南阳汉冶特钢有限公司 Production method of high-toughness high-Z-direction-performance super-thick steel Q460GJ with compression ratio not greater than 4

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