CN107267857A - A kind of 07MnNiMoDR steel plates and its press quenching production method - Google Patents

A kind of 07MnNiMoDR steel plates and its press quenching production method Download PDF

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Publication number
CN107267857A
CN107267857A CN201710400183.XA CN201710400183A CN107267857A CN 107267857 A CN107267857 A CN 107267857A CN 201710400183 A CN201710400183 A CN 201710400183A CN 107267857 A CN107267857 A CN 107267857A
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press quenching
temperature
steel plate
07mnnimodr
steel plates
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邓建军
王晓书
赵文忠
高雅
张朋
张志军
耿宽宽
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Wuyang Iron and Steel Co Ltd
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Wuyang Iron and Steel Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18Hardening; Quenching with or without subsequent tempering
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226Hot rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/002Bainite
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/005Ferrite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Metal Rolling (AREA)

Abstract

The invention discloses a kind of method that press quenching produces 07MnNiMoDR steel plates, method includes rolling, press quenching cooling, tempering process;Steel plate chemical composition is constituted and weight/mass percentage composition is:C:0.06 0.09%, Si:0.20 0.50%, Mn:1.50 1.60%, P≤0.010%, S≤0.005%, Alt:0.020 0.050%, Ni:0.30 0.40%, Mo:0.10 0.20%, Nb:0.015 0.025%, Cr:0.10 0.20%, surplus is Fe and inevitable impurity.The present invention is rationally coordinated by rational composition design using controlled rolling+ACC, reaches press quenching, is obtained with conventional modifier treatment with the mechanical property of steel plate of effect, without carrying out out-line quenching, is simplified heat treatment step, improve production efficiency, saved the energy.

Description

A kind of 07MnNiMoDR steel plates and its press quenching production method
Technical field
The invention belongs to metallurgical technology field, and in particular to a kind of 07MnNiMoDR steel plates and its press quenching producer Method.
Background technology
07MnNiMoDR steel is used as a kind of liquefied petroleum gas for substituting external imported material in national standard(LPG)Low-temperature storage tank is used Steel, because such low-carbon bainite shape steel plate has, technique is simple, save the energy, obdurability is good, be easy to shaping and excellent The advantages of welding performance, the manufacturing cost of liquefied petroleum gas low-temperature storage tank can be substantially reduced, demand in the market is increasing, It is widely used in manufacturing liquefied petroleum gas low-temperature storage tank container.China's rapid economic development now, Chinese market has become generation The desired region of larger liquefied petroleum gas in boundary.I.e. with the increase of liquefied petroleum gas usage amount, to the need of 07MnNiMoDR steel The amount of asking also is continuously increased.
Production on 07MnNiMoDR steel at present, according to GB/T19189《Pressure vessel quenched and tempered high tensile strength plate》Mark Standard, is delivered goods using quenched (out-line quenching+tempering).Such as existing patent, CN201610414647's《A kind of quenching and tempering type high intensity Steel plate for low-temperature vessel and its production method》, CN201310292500.2《A kind of low-temperature (low temperature) vessel steel 07MnNiMoDR production Method》Deng, using conventional heat treatment method, i.e., after steel plate rolling,(Stacking)Cool down, pass through heat treatment step again, pass through Steel plate is reheated to quenching cooling, suitable temperature after relevant temperature and is tempered by heat treatment heating furnace.The production method produces work Sequence is more, cycle length, energy consumption are big, cost is high.
To improve production capacity, simplify production process, develop new technology, this patent is rational cold by control using the operation of rolling But speed and finishing temperature, realize the purpose of rolling line press quenching.It can be realized and be carried out after steel plate rolling by this patent technique After the temper for being adapted to temperature, every mechanical property of steel plate meets technical requirements.This technique productions 07MnNiMoDR steel Plate, with technological process is short, energy consumption is low, cost is low, allegro feature, adapts to the demand of iron and steel enterprise's cost efficiency.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of 07MnNiMoDR steel plates and its press quenching production method.This Inventive method simplifies production technology, has broken the conventional production stream that steel plate is produced using quenched (out-line quenching+tempering) method Journey, using this technique, can have the 07MnNiMoDR steel plates of low-temperature flexibility with steady production thickness≤50mm.
In order to solve the above technical problems, the technical solution used in the present invention is as follows:A kind of 07MnNiMoDR steel plates, it is described Steel plate chemical composition is constituted and weight/mass percentage composition is as follows:C:0.06-0.09%, Si:0.20-0.50%, Mn:1.50-1.60%, P ≤ 0.010%, S≤0.005%, Alt:0.020-0.050%, Ni:0.30-0.40%, Mo:0.10-0.20%, Nb:0.015- 0.025%, Cr:0.10-0.20%, surplus is Fe and inevitable impurity.
It is bainite and ferritic duplex structure inside steel plate of the present invention.
Steel plate thickness≤50mm of the present invention.
Mechanical property of steel plate of the present invention:Yield strength >=530MPa, tensile strength 630-680MPa, elongation percentage >= 21%, -50 DEG C of low-temperature impact work >=150J.
Another object of the present invention is to provide a kind of above-mentioned 07MnNiMoDR steel plates press quenching production method, methods described Including rolling, press quenching cooling, tempering process;The press quenching refrigerating work procedure, rolls rear steel plate and enters ACC coolings.
Press quenching refrigerating work procedure of the present invention, rolls rear steel plate and enters ACC coolings, it is 760-770 DEG C, roller to enter coolant-temperature gage Fast 0.4-0.8m/s, cooling rate is 7-12 DEG C/S, and water outlet red temperature is 500-550 DEG C.
Press quenching refrigerating work procedure of the present invention, cooling system includes four groups of A, B, C, D area pressure cooling water section, works as steel During plate thickness≤38mm, lower collector pipe water ratio is 0.7 in 4th area:1, water flow velocity A area are controlled in 300-400m3/ h, B, C, D area Control respectively in 200-300m3/h;As 38mm≤steel plate thickness≤50mm, lower collector pipe water ratio is 0.8 in 4th area:1, water Flow velocity A areas are controlled in 400-500m3/ h, B, C, D area are controlled in 300-400m respectively3/h。
Rolling process of the present invention, steel billet total heat time >=8min/cm × H, H is thickness of strand, and unit is cm; Maximum heating temperature≤1260 DEG C, soaking zone temperature is 1240-1260 DEG C.
Rolling process of the present invention, using II stage rolling, stage i ensures high temperature heavy reduction rolling, 1000 DEG C There is the reduction ratio of 2~3 passages above more than 20%, treat the warm finished product thickness that steel thickness is more than 2.5 times that dries in the air, the IIth stage opened It is 830-850 DEG C to roll temperature, and finishing temperature is 770-790 DEG C.
Tempering process of the present invention, temperature is 640-660 DEG C, and total tempering time coefficient is 1.5-2.5min/mm, Come out of the stove air cooling.
07MnNiMoDR steel sheet products canonical reference GB/T19189 of the present invention《Pressure vessel quenched and tempered high tensile strength plate》Mark It is accurate.
It is using the beneficial effect produced by above-mentioned technical proposal:1st, in the operation of rolling of the present invention, using controlled rolling+ACC Reasonable cooperation, obtain larger cooling rate and relatively low red temperature, reach the purpose of press quenching, cooling procedure is easier Control, cooling is more uniform, and performance is more stablized.2nd, press quenching technique productions 07MnNiMoDR steel plates of the present invention, by closing Rolling, cooling and the tempering process of reason realize the comprehensive mechanical property of steel plate, can reduce by one of quenching heat treatment process, low cost Efficiently produce low-temperature pressure vessel steel plate.3rd, the present invention is compared with heat-treated offline, using the work for rolling rear direct-on-line quenching Skill, obtains the metallographic structure with conventional quenched rear same type, without carrying out out-line quenching, simplifies heat treatment step, carry simultaneously High production efficiency, has saved the energy.4th, the present invention obtains the uniform tiny bainite of steel plate and ferritic duplex structure, and Steel plate even tissue, tiny, nonmetal inclusion are atomic, and steel plate maximum gauge can reach 50mm.5th, present invention gained steel plate is in the wrong Take intensity >=530MPa, tensile strength 630-680MPa, elongation percentage >=21%, -50 DEG C of low-temperature impact work >=150J, comprehensive mechanics Better performances.
Brief description of the drawings
Fig. 1 is the micro-organization chart of 8mm steel plates in embodiment 1(At thickness of slab 1/4);
Fig. 2 is the micro-organization chart of 24mm steel plates in embodiment 2(At thickness of slab 1/4);
Fig. 3 is the micro-organization chart of 24mm steel plates in embodiment 2(At thickness of slab 1/2);
Fig. 4 is the micro-organization chart of 35mm steel plates in embodiment 3(At thickness of slab 1/4);
Fig. 5 is the micro-organization chart of 35mm steel plates in embodiment 3(At thickness of slab 1/2);
Fig. 6 is the micro-organization chart of 42mm steel plates in embodiment 4(At thickness of slab 1/4);
Fig. 7 is the micro-organization chart of 42mm steel plates in embodiment 4(At thickness of slab 1/2);
Fig. 8 is the micro-organization chart of 50mm steel plates in embodiment 5(At thickness of slab 1/4);
Fig. 9 is the micro-organization chart of 50mm steel plates in embodiment 5((At thickness of slab 1/2).
Embodiment
With reference to specific embodiment, the present invention is further detailed explanation.
Embodiment 1
The present embodiment 07MnNiMoDR steel plate thickness is 8mm, and steel plate chemical composition composition and its weight/mass percentage composition are:C:0 .06%, Si:0 .24%, Mn:1.60%, P:0.008%, S:0.003%, Alt:0.034%, Ni:0.33%, Mo:0.16%, Nb: 0.025%, Cr:0.10%, surplus is Fe and inevitable impurity.
The present embodiment 07MnNiMoDR Plate Productions method includes rolling, press quenching cooling, tempering process, concrete technology Step is as described below:
(1)Rolling process:In the operation of rolling, using the continuous casting billet milling of 210mm thickness, the total heat time 168min of steel billet, 1250 DEG C of maximum heating temperature, soaking zone temperature is 1240 DEG C;II stage rolling is used during rolling, stage i ensures that high temperature is big Drafts is rolled, and more than 1000 DEG C have the reduction ratio of 2 passages up to 46%, treats that temperature dries in the air steel thickness for 60mm, the IIth stage start rolling temperature For 830 DEG C, finishing temperature is 790 DEG C.
(2)Press quenching refrigerating work procedure:It is cold into ACC progress with roller-way after steel plate rolling in press quenching cooling procedure But, it is 760 DEG C to enter coolant-temperature gage, roller speed 0.8m/s, and cooling rate is 11 DEG C/S, and water outlet red temperature is 500 DEG C;ACC cooling devices are opened Lower collector pipe water ratio is 0.7 in Qi Si group pressure cooling water section, 4th area:1, water flow velocity A area are controlled in 330m3/ h, B, C, D area Control respectively in 270m3/h。
(3)Tempering process:In drawing process, temperature is 660 DEG C, and total tempering time coefficient is 1.5min/mm, is gone out Stove air cooling.
The mechanical property of 07MnNiMoDR steel plates obtained by the present embodiment is shown in Table microscopic structure at 1, steel plate thickness of slab 1/4 and sees Fig. 1.
Embodiment 2
The present embodiment 07MnNiMoDR steel plate thickness is 24mm, and steel plate chemical composition composition and its weight/mass percentage composition are:C: 0.06%, Si:0.20%, Mn:1.50%, P:0.009%, S:0.005%, Alt:0.045%, Ni:0.35%, Mo:0.10%, Nb: 0.015%, Cr:0.12%, surplus is Fe and micro inevitable impurity.
The present embodiment 07MnNiMoDR Plate Productions method includes rolling, press quenching cooling, tempering process, concrete technology Step is as described below:
(1)Rolling process:In the operation of rolling, using the continuous casting billet milling of 250mm thickness, the total heat time 210min of steel billet, 1255 DEG C of maximum heating temperature, soaking zone temperature is 1241 DEG C;II stage rolling is used during rolling, stage i ensures that high temperature is big Drafts is rolled, and more than 1000 DEG C have the reduction ratio of 3 passages up to 51%, treats that temperature dries in the air steel thickness for 80mm, the IIth stage start rolling temperature For 837 DEG C, finishing temperature is 783 DEG C.
(2)Press quenching refrigerating work procedure:It is cold into ACC progress with roller-way after steel plate rolling in press quenching cooling procedure But, it is 768 DEG C to enter coolant-temperature gage, roller speed 0.7m/s, and cooling rate is 12 DEG C/S, and water outlet red temperature is 521 DEG C;ACC cooling devices are opened Lower collector pipe water ratio is 0.7 in Qi Si group pressure cooling water section, 4th area:1, water flow velocity A area are controlled in 300m3/ h, B, C, D area Control respectively in 200m3/h。
(3)Tempering process:In drawing process, temperature is 660 DEG C, and total tempering time coefficient is 2min/mm, is come out of the stove Air cooling.
The mechanical property of 07MnNiMoDR steel plates obtained by the present embodiment is shown in Table microscopic structure at 1, steel plate thickness of slab 1/4 and sees Fig. 2, Microscopic structure is shown in Fig. 3 at steel plate thickness of slab 1/2.
Embodiment 3
The present embodiment 07MnNiMoDR steel plate thickness is 35mm, and steel plate chemical composition composition and its weight/mass percentage composition are:C: 0.07%, Si:0.50%, Mn:1.55%, P:0.010%, S:0.004%, Alt:0.020%, Ni:0.40%, Mo:0.19%, Nb: 0.020%, Cr:0.15%, surplus is Fe and micro inevitable impurity.
The present embodiment 07MnNiMoDR Plate Productions method includes rolling, press quenching cooling, tempering process, concrete technology Step is as described below:
(1)Rolling process:In the operation of rolling, using the continuous casting billet milling of 250mm thickness, the total heat time 220min of steel billet, 1249 DEG C of maximum heating temperature, soaking zone temperature is 1258 DEG C;II stage rolling is used during rolling, stage i ensures that high temperature is big Drafts is rolled, and more than 1000 DEG C have the reduction ratio of 3 passages up to 46%, treats that temperature dries in the air steel thickness for 90mm, the IIth stage start rolling temperature For 850 DEG C, finishing temperature is 770 DEG C.
(2)Press quenching refrigerating work procedure:It is cold into ACC progress with roller-way after steel plate rolling in press quenching cooling procedure But, it is 762 DEG C to enter coolant-temperature gage, roller speed 0.6m/s, and cooling rate is 10 DEG C/S, and water outlet red temperature is 546 DEG C;ACC cooling devices are opened Lower collector pipe water ratio is 0.7 in the four groups of pressure cooling water sections opened, 4th area:1, water flow velocity A area are controlled in 400m3/ h, B, C, D Area is controlled in 300m respectively3/h。
(3)Tempering process:In drawing process, temperature is 650 DEG C, and total tempering time coefficient is 2min/mm, is come out of the stove Air cooling.
The mechanical property of 07MnNiMoDR steel plates obtained by the present embodiment is shown in Table microscopic structure at 1, steel plate thickness of slab 1/4 and sees Fig. 4, Microscopic structure is shown in Fig. 5 at steel plate thickness of slab 1/2.
Embodiment 4
The present embodiment 07MnNiMoDR steel plate thickness is 42mm, and steel plate chemical composition composition and its weight/mass percentage composition are:C: 0.08%, Si:0.35%, Mn:1.53%, P:0.008%, S:0.005%, Alt:0.050%, Ni:0.30%, Mo:0.19%, Nb: 0.023%, Cr:0.17%, surplus is Fe and micro inevitable impurity.
The present embodiment 07MnNiMoDR Plate Productions method includes rolling, press quenching cooling, tempering process, concrete technology Step is as described below:
(1)Rolling process:In the operation of rolling, using the continuous casting billet milling of 300mm thickness, the total heat time 240min of steel billet, 1260 DEG C of maximum heating temperature, soaking zone temperature is 1260 DEG C;II stage rolling is used during rolling, stage i ensures that high temperature is big Drafts is rolled, and more than 1000 DEG C have the reduction ratio of 2 passages up to 20%, treats that temperature dries in the air steel thickness for 120mm, the IIth stage open rolling temperature Spend for 835 DEG C, finishing temperature is 790 DEG C.
(2)Press quenching refrigerating work procedure:It is cold into ACC progress with roller-way after steel plate rolling in press quenching cooling procedure But, it is 770 DEG C to enter coolant-temperature gage, roller speed 0.4m/s, and cooling rate is 7 DEG C/S, and water outlet red temperature is 550 DEG C;ACC cooling devices are opened Lower collector pipe water ratio is 0.8 in four groups of pressure cooling water sections, 4th area:1, water flow velocity A area are controlled in 470m3/ h, B, C, D are distinguished Do not control in 400m3/h。
(3)Tempering process:In drawing process, temperature is 640 DEG C, and total tempering time coefficient is 2min/mm, is come out of the stove Air cooling.
The mechanical property of 07MnNiMoDR steel plates obtained by the present embodiment is shown in Table microscopic structure at 1, steel plate thickness of slab 1/4 and sees Fig. 6, Microscopic structure is shown in Fig. 7 at steel plate thickness of slab 1/2.
Embodiment 5
The present embodiment 07MnNiMoDR steel plate thickness is 50mm, and steel plate chemical composition composition and its weight/mass percentage composition are:C: 0.09%, Si:0.47%, Mn:1.57%, P:0.009%, S:0.003%, Alt:0.043%, Ni:0.37%, Mo:0.20%, Nb: 0.018%, Cr:0.20%, surplus is Fe and micro inevitable impurity.
The present embodiment 07MnNiMoDR Plate Productions method includes rolling, press quenching cooling, tempering process, concrete technology Step is as described below:
(1)Rolling process:In the operation of rolling, using the continuous casting billet milling of 330mm thickness, the total heat time 265min of steel billet, 1257 DEG C of maximum heating temperature, soaking zone temperature is 1252 DEG C;II stage rolling is used during rolling, stage i ensures that high temperature is big Drafts is rolled, and more than 1000 DEG C have the reduction ratio of 2 passages up to 33%, treats that temperature dries in the air steel thickness for 125mm, the IIth stage open rolling temperature Spend for 848 DEG C, finishing temperature is 789 DEG C.
(2)Press quenching refrigerating work procedure:It is cold into ACC progress with roller-way after steel plate rolling in press quenching cooling procedure But, it is 764 DEG C to enter coolant-temperature gage, roller speed 0.4m/s, and cooling rate is 9 DEG C/S, and water outlet red temperature is 540 DEG C;ACC cooling devices are opened Lower collector pipe water ratio is 0.8 in four groups of pressure cooling water sections, 4th area:1, water flow velocity A area are controlled in 500m3/ h, B, C, D are distinguished Do not control in 300m3/h。
(3)Tempering process:In drawing process, temperature is 640 DEG C, and total tempering time coefficient is 2.5min/mm, is gone out Stove air cooling.
The mechanical property of 07MnNiMoDR steel plates obtained by the present embodiment is shown in Table microscopic structure at 1, steel plate thickness of slab 1/4 and sees Fig. 8, Microscopic structure is shown in Fig. 9 at steel plate thickness of slab 1/2.
The mechanical property of the 07MnNiMoDR steel plates produced in embodiment 1-5 using press quenching is as shown in table 1.
The mechanical property of the embodiment 1-5 steel plates of table 1
The microscopic structure of steel plate is shown in Fig. 1-9 obtained by embodiment 1-5.As shown in figs 1-9, by rational composition design, controlled rolling+ ACC rationally coordinates, and reaches press quenching, obtains the mechanical property of steel plate with effect with conventional modifier treatment, and each thickness specification is equal Bainite and ferritic duplex structure are obtained, histological difference of the stack pile specification at diverse location is smaller, do not found substantially Banded structure, the uniform tiny organization security comprehensive mechanical property of steel plate.
Above example is only used to illustrative and not limiting technical scheme, although with reference to above-described embodiment to this hair It is bright to be described in detail, it will be understood by those within the art that:Still the present invention can be modified or be waited With replacement, any modification or partial replacement without departing from the spirit and scope of the present invention, it all should cover the power in the present invention Among sharp claimed range.

Claims (10)

1. a kind of 07MnNiMoDR steel plates, it is characterised in that the steel plate chemical composition composition and weight/mass percentage composition are as follows:C: 0.06-0.09%, Si:0.20-0.50%, Mn:1.50-1.60%, P≤0.010%, S≤0.005%, Alt:0.020-0.050%, Ni:0.30-0.40%, Mo:0.10-0.20%, Nb:0.015-0.025%, Cr:0.10-0.20%, surplus is Fe and inevitable Impurity.
2. the method that a kind of press quenching according to claim 1 produces 07MnNiMoDR steel plates, it is characterised in that described It is bainite and ferritic duplex structure inside steel plate.
3. the method that a kind of press quenching according to claim 1 or 2 produces 07MnNiMoDR steel plates, it is characterised in that Steel plate thickness≤the 50mm.
4. the method that a kind of press quenching according to claim 1 or 2 produces 07MnNiMoDR steel plates, it is characterised in that The mechanical property of steel plate:Yield strength >=530MPa, tensile strength 630-680MPa, elongation percentage >=21%, -50 DEG C of low temperature punchings Hit work(>=150J.
5. a kind of 07MnNiMoDR steel plates press quenching production method, it is characterised in that methods described includes rolling, press quenching Cooling, tempering process;The press quenching refrigerating work procedure, rolls rear steel plate and enters ACC coolings.
6. the method that a kind of press quenching according to claim 5 produces 07MnNiMoDR steel plates, it is characterised in that described Press quenching refrigerating work procedure, rolls rear steel plate and enters ACC coolings, it is 760-770 DEG C, roller speed 0.4-0.8m/s, cooling rate to enter coolant-temperature gage For 7-12 DEG C/S, water outlet red temperature is 500-550 DEG C.
7. the method that a kind of press quenching according to claim 5 produces 07MnNiMoDR steel plates, it is characterised in that described Press quenching refrigerating work procedure, cooling system includes four groups of A, B, C, D area pressure cooling water section, as steel plate thickness≤38mm, four Lower collector pipe water ratio is 0.7 in area:1, water flow velocity A area are controlled in 300-400m3/ h, B, C, D area are controlled in 200- respectively 300m3/h;As 38mm≤steel plate thickness≤50mm, lower collector pipe water ratio is 0.8 in 4th area:The control of 1, water flow velocity A area exists 400-500m3/ h, B, C, D area are controlled in 300-400m respectively3/h。
8. the method that a kind of press quenching according to claim 5-7 any one produces 07MnNiMoDR steel plates, it is special Levy and be, the rolling process, steel billet total heat time >=8min/cm × H, H is thickness of strand, and unit is cm;Highest adds Hot temperature≤1260 DEG C, soaking zone temperature is 1240-1260 DEG C.
9. the method that a kind of press quenching according to claim 5-7 any one produces 07MnNiMoDR steel plates, it is special Levy and be, the rolling process, using II stage rolling, stage i ensures high temperature heavy reduction rolling, and more than 1000 DEG C have 2 The reduction ratio of~3 passages treats the warm finished product thickness that steel thickness is more than 2.5 times that dries in the air more than 20%, and the IIth stage start rolling temperature is 830-850 DEG C, finishing temperature is 770-790 DEG C.
10. the method that a kind of press quenching according to claim 5-7 any one produces 07MnNiMoDR steel plates, it is special Levy and be, the tempering process, temperature is 640-660 DEG C, total tempering time coefficient is 1.5-2.5min/mm, sky of coming out of the stove It is cold.
CN201710400183.XA 2017-05-31 2017-05-31 A kind of 07MnNiMoDR steel plates and its press quenching production method Pending CN107267857A (en)

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CN109266815A (en) * 2018-11-19 2019-01-25 山东钢铁股份有限公司 The board-shape control method of press quenching high strength steel plate
CN111519097A (en) * 2020-05-12 2020-08-11 首钢集团有限公司 460 MPa-level structural steel and preparation method thereof
CN111778451A (en) * 2020-06-24 2020-10-16 南京钢铁股份有限公司 07MnNiMoDR steel plate for spherical tank and production process

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CN104120366A (en) * 2014-06-21 2014-10-29 首钢总公司 Quenched and tempered high-strength steel plate for pressure vessels and production method thereof
CN105908084A (en) * 2016-06-14 2016-08-31 舞阳钢铁有限责任公司 Tempering type high-strength steel plate for low-temperature container and production method for tempering type high-strength steel plate
CN106191674A (en) * 2016-07-26 2016-12-07 舞阳钢铁有限责任公司 Low cost continuous casting billet is become a useful person big thickness steel plate for low temperature pressure container and production method

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CN103266278A (en) * 2013-05-07 2013-08-28 舞阳钢铁有限责任公司 Quenching and tempering type pipe line steel plate and production method thereof
CN104120366A (en) * 2014-06-21 2014-10-29 首钢总公司 Quenched and tempered high-strength steel plate for pressure vessels and production method thereof
CN105908084A (en) * 2016-06-14 2016-08-31 舞阳钢铁有限责任公司 Tempering type high-strength steel plate for low-temperature container and production method for tempering type high-strength steel plate
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CN109266815A (en) * 2018-11-19 2019-01-25 山东钢铁股份有限公司 The board-shape control method of press quenching high strength steel plate
CN111519097A (en) * 2020-05-12 2020-08-11 首钢集团有限公司 460 MPa-level structural steel and preparation method thereof
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