CN103334064B - Low yield ratio chromium-molybdenum steel plate and production method thereof - Google Patents
Low yield ratio chromium-molybdenum steel plate and production method thereof Download PDFInfo
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Abstract
The invention relates to a low yield ratio chromium-molybdenum steel plate and a production method thereof, belonging to the technical field of steel smelting. The production method comprises the following processes of smelting continuous casting, heating and rolling, and thermal treating. The steel plate comprises the following components by weight percent: more than or equal to 0.13% and less than or equal to 0.17% of C, more than or equal to 0.30% and less than or equal to 0.40% of Si, more than or equal to 0.50% and less than or equal to 0.70% of Mn, less than or equal to 0.007% of P, less than or equal to 0.005% of S, more than or equal to 1.00% and less than or equal to 1.10% of Cr, more than or equal to 0.50% and less than or equal to 0.65% of Mo, less than or equal to 0.20% of Cu, more than or equal to 0.10% and less than or equal to 0.20% of Ni, less than or equal to 0.003% of Sb, less than or equal to 0.010% of Sn, less than or equal to 0.010% of As, the balance of Fe and inevitable impurities. The low yield ratio chromium-molybdenum steel plate meets the requirement of domestic and aboard petrifaction and coalification industries on lowing the yield ratio of the chromium-molybdenum steel plate used at high temperature environment, can be widely used on devices such as delay coking devices of coke drums and hydrogenation reactor and the like, has good cold bending property, does not crack when being manufactured, and has good rebound elasticity and good plate shape.
Description
Technical field
The present invention relates to a kind of chrome molybdenum steel plate and production method thereof of low yield strength ratio, belong to smelting iron and steel Technology field.
Background technology
Petrochemical industry and the requirement of coalification industrial expansion to refinery device is in recent years maximized increasingly, has higher requirement, also get up harsher to the performance requriements of device fabrication steel plate to the security of equipment, particularly more and more higher to the requirement of low-temperature flexibility.The maximization of simultaneous equipment, to the anti-adverse environment of equipment and the requirement of extreme environment also more and more higher, to petrochemical industry and coalification chrome molybdenum steel plate, some designing units have started to include yield tensile ratio in design specifications, and will become a kind of trend.In background technology, the yield tensile ratio of general normalizing+Annealed Strip chromemolybdenum steel product is 0.82 ~ 0.87, but the yield tensile ratio of steel plate has been limited in less than 0.80 by existing partial design specification, and be required to meet the low-temperature impact toughness not losing steel plate in simulation as-welded; In order to reduce the yield tensile ratio of steel plate, background technology needs to reduce speed of cooling after steel plate normalizing, with the appropriate ferrite content in satisfied tissue, but this must impact the steel plate impelling strength of simulation postwelding, and in two-phase region normalizing, certain speed of cooling must be kept again, otherwise also can have infringement to the impelling strength of steel plate.Under how meeting the prerequisite of low yield strength ratio, ensure that chrome molybdenum steel plate that the impelling strength of steel plate produces low yield strength ratio is this area technical problem urgently to be resolved hurrily.
Summary of the invention
The object of the invention is to provide a kind of chrome molybdenum steel plate and production method thereof of low yield strength ratio, and armor plate strength is moderate, and impelling strength is good, and can meet the requirement of low yield strength ratio, solves the problems referred to above existed in background technology.
The technical scheme of invention is: a kind of chrome molybdenum steel plate of low yield strength ratio, is made up of the component of following weight percentage: 0.13%≤C≤0.17%, 0.30%≤Si≤0.40%, 0.50%≤Mn≤0.70%, P≤0.007%, S≤0.005%, 1.00%≤Cr≤1.10%, 0.50%≤Mo≤0.65%, Cu≤0.20%, 0.10%≤Ni≤0.20%, Sb≤0.003%, Sn≤0.010%, As≤0.010%, surplus is Fe and inevitable impurity.
The chromemolybdenum steel plate thickness of described low yield strength ratio is 30 ~ 70mm.
Invention product adopts Cr, Mo alloying element complex intensifying, through rational thermal treatment process, obtains good obdurability coupling, can meet again the requirement of low yield strength ratio simultaneously.In the present invention, Si mainly improves the intensity of steel plate with solution strengthening form, but can not too high levels, in order to avoid reduce the toughness of steel plate; Mn content is selected at 0.50-0.60%, Mn mainly plays solution strengthening, reduces transformation temperature and improve armor plate strength, and Mn can significantly improve the hardening capacity of steel plate, with the increase of Mn content, plasticity and the low-temperature impact toughness of steel plate slightly decline, and intensity significantly improves; Cr content 1.00% ~ 1.10%, Mo content 0.50% ~ 0.65%, Cr, Mo all can increase austenite and cross cold energy power, improve the hardening capacity of steel plate, promote the formation of bainite; Ni, Mo content is low, both can meet steel plate obdurability demand, save alloy again, reduce costs; P≤0.007%, S≤0.005% is pure in order to ensure steel plate steel, higher impelling strength and the resistance to embrittlement energy affecting steel plate of P content.The bullion content added in steel plate of the present invention is relatively less, and cost is lower, has the market competitiveness.
A production method for the chrome molybdenum steel plate of low yield strength ratio, comprise and smelt continuous casting working procedure, heating rolling operation, heat treatment step, each process is as follows:
(1) continuous casting working procedure is smelted: adopt electric arc furnace or converter mode to smelt, then send in LF refining furnace and carry out refining and through vacuum-treat, blank is cast out afterwards through continuous casting operation, be referred to as continuously cast bloom, the chemical component weight percentage composition of continuously cast bloom: 0.13%≤C≤0.17%, 0.30%≤Si≤0.40%, 0.50%≤Mn≤0.70%, P≤0.007%, S≤0.005%, 1.00%≤Cr≤1.10%, 0.50%≤Mo≤0.65%, Cu≤0.20%, 0.10%≤Ni≤0.20%, Sb≤0.003%, Sn≤0.010%, As≤0.010%, surplus is Fe and inevitable impurity,
(2) heating rolling operation: continuous oven heating rolling put into by described continuously cast bloom, heating, insulation homogenizing, adopt two-stage controlled rolling process, first stage is the austenite recrystallization stage, control draught, subordinate phase is the austenite non-recrystallize stage, carries out on-line cooling after rolling, and ensures that steel plate obtains the tissue of refinement;
(3) heat treatment step: steel plate through double normalizing and accelerating cooling, and through temper, obtains finished steel plate.
Described heating rolling operation, adopt two-stage controlled rolling process, first stage is the austenite recrystallization stage, control reduction in pass more than 12%, subordinate phase is the non-recrystallize stage rolling of austenite, ensure that accumulative draft is more than 70%, carries out on-line cooling after rolling, ensures that steel plate obtains the tissue of even refinement.
Described heat treatment step, adopt double normalizing+accelerating cooling and through the thermal treatment process of tempering, first time, normalizing temperature was 900 ~ 930 DEG C, and second time normalizing temperature is 830 ~ 860 DEG C, all puts into accelerating cooling medium and carry out accelerating cooling after normalizing, afterwards again through temper, tempering temperature is 700 ~ 750 DEG C, and soaking time is 4 × t min, t is steel plate thickness, unit: mm, after insulation, air cooling obtains finished steel plate.
In described heat treatment step, accelerating cooling medium is water.
Production method of the present invention, smelt by electrosmelting mode, the impurity harmful element content such as P, S are low, and steel is pure; Steel plate of the present invention adopts two-stage controlled rolling process and the controlled rolling of II type, solves coarse grains inequality, problem that impelling strength is lower; The rolling technology of steel plate of the present invention is simple, easy handling, is suitable for the ordinary steel ironworks production having quenching press, normalizing furnace, outer machine stove, car bottom furnace.Production method of the present invention achieves lower carbon equivalent and the chemical composition design of alloy content, obtain the steel plate of the resistance to embrittlement energy with more tiny weave construction and Geng Jia simultaneously, the every mechanical performance index of steel plate produced all meets technical qualification requirement, and production cost significantly reduces.The mechanical property of steel plate of the present invention after Simulated post-weld heat treatment reaches following requirements after testing: Rp
0.2> 314MPa, Rm:450 ~ 585MPa, A
50>=22% ,-10 DEG C of A
kV>=54J, yield tensile ratio≤0.8.
Advantage of the present invention and effect: low yield strength ratio chrome molybdenum steel plate of the present invention meets domestic and international petrochemical industry and coalification industry to the demand reducing hot environment chrome molybdenum steel plate yield tensile ratio, can be widely used on the equipment such as coke drum delayed coking equipment, hydrogenator; The cold-bending property of steel plate is good, and do not ftracture when material makes, rebound resilience is good, and steel plate template is good.
Embodiment
The present invention will be further described by the following examples.
embodiment 1
The steel plate thickness 36mm of the present embodiment, is made up of the component of following weight percentage: C 0.13%, Si 0.32%, Mn 0.57%, P 0.003%, S 0.001%, Cr 1.03%, Mo 0.52%, Cu 0.07%, Ni 0.12%, Sb 0.004%, Sn 0.005%, As 0.009%, surplus is Fe and inevitable impurity.
The production method of the chrome molybdenum steel plate of the present embodiment low yield strength ratio, comprise and smelt continuous casting working procedure, heating rolling operation, heat treatment step, each process is as follows:
(1) smelt continuous casting working procedure: adopt electric arc furnace or converter mode to smelt, then send in LF refining furnace and carry out refining and through vacuum-treat, cast out blank through continuous casting operation afterwards, be referred to as continuously cast bloom;
(2) heating rolling operation: continuous oven heating rolling put into by described continuously cast bloom, heating, insulation homogenizing, adopt two-stage controlled rolling process, first stage is the austenite recrystallization stage, control reduction in pass more than 12%, subordinate phase is the austenite non-recrystallize stage, controls accumulative draft more than 70%.Carry out on-line cooling after rolling, ensure that steel plate obtains the tissue of refinement;
(3) heat treatment step: steel plate through double normalizing and accelerating cooling, and through temper, obtains finished steel plate.Normalizing temperature is 900 DEG C ~ 910 DEG C for the first time, second time normalizing temperature is 830 DEG C ~ 860 DEG C, all put into accelerating cooling medium after normalizing and carry out accelerating cooling, afterwards again through temper, tempering temperature is 660 DEG C ~ 680 DEG C, soaking time is 4 × t min(t is steel plate thickness, unit: mm), after insulation, air cooling obtains finished steel plate.Described normalizing accelerating cooling medium is water.
The steel plate physicochemical property inspection institute of the present embodiment is with sample through Simulated post-weld heat treatment, and wherein minimum simulation weldering (Min. PWHT) heat-treat condition is 690 DEG C × 3h, and maximum analog postwelding (Max. PWHT) heat-treat condition is: 690 DEG C × 20h.Embodiment steel plate physicochemical property assay as shown in Table 1 and Table 2.
the mechanical property of table 1 embodiment 1 steel plate after Simulated post-weld heat treatment (thickness of slab 1/2)
the maximum die welding tissue of table 2 embodiment 1 steel plate and inclusion analysis result
As can be seen from table 1, table 2, the chrome molybdenum steel plate yield tensile ratio of the present embodiment is moderate, and plasticity and toughness are good.Crystal grain is superfine, is organized as ferrite+tempering bainite.
embodiment 2
The steel plate thickness 52mm of the present embodiment, is made up of the component of following weight percentage: C 0.14%, Si 0.33%, Mn 0.59%, P 0.005%, S 0.003%, Cr 1.02%, Mo 0.51%, Cu 0.07%, Ni 0.12%, Sb 0.004%, Sn 0.004%, As 0.010%, surplus is Fe and inevitable impurity.
The production method of the chrome molybdenum steel plate of the present embodiment low yield strength ratio, comprise and smelt continuous casting working procedure, heating rolling operation, heat treatment step, each process is as follows:
(1) smelt continuous casting working procedure: adopt electric arc furnace or converter mode to smelt, then send in LF refining furnace and carry out refining and through vacuum-treat, cast out blank through continuous casting operation afterwards, be referred to as continuously cast bloom;
(2) heating rolling operation: continuous oven heating rolling put into by described continuously cast bloom, heating, insulation homogenizing, adopt two-stage controlled rolling process, first stage is the austenite recrystallization stage, control reduction in pass more than 12%, subordinate phase is the austenite non-recrystallize stage, controls accumulative draft more than 70%.Carry out on-line cooling after rolling, ensure that steel plate obtains the tissue of refinement;
(3) heat treatment step: steel plate through double normalizing and accelerating cooling, and through temper, obtains finished steel plate.Normalizing temperature is 900 DEG C ~ 910 DEG C for the first time, second time normalizing temperature is 830 DEG C ~ 860 DEG C, all put into accelerating cooling medium after normalizing and carry out accelerating cooling, afterwards again through temper, tempering temperature is 660 DEG C ~ 680 DEG C, soaking time is 4 × t min(t is steel plate thickness, unit: mm), after insulation, air cooling obtains finished steel plate.Described normalizing accelerating cooling medium is water.
The steel plate physicochemical property inspection institute of the present embodiment is with sample through Simulated post-weld heat treatment, and wherein minimum simulation weldering (Min. PWHT) heat-treat condition is 690 DEG C × 3h, and maximum analog postwelding (Max. PWHT) heat-treat condition is: 690 DEG C × 20h.Embodiment steel plate physicochemical property assay as shown in Table 3 and Table 4.
the mechanical property of table 3 embodiment 2 steel plate after Simulated post-weld heat treatment (thickness of slab 1/2)
the maximum die welding tissue of table 4 embodiment 2 steel plate and inclusion analysis result
As can be seen from table 3, table 4, the yield tensile ratio of the low yield strength ratio chrome molybdenum steel plate of the present embodiment is moderate, and plasticity and toughness are good.Crystal grain is superfine, is organized as ferrite+tempering bainite.
embodiment 3
The steel plate thickness 58mm of the present embodiment, is made up of the component of following weight percentage: C 0.15%, Si 0.33%, Mn 0.56%, P 0.004%, S 0.001%, Cr 1.02%, Mo 0.52%, Cu 0.02%, Ni 0.12%, Sb 0.002%, Sn 0.003%, As 0.008%, surplus is Fe and inevitable impurity.
The production method of the chrome molybdenum steel plate of the present embodiment low yield strength ratio, comprise and smelt continuous casting working procedure, heating rolling operation, heat treatment step, each process is as follows:
(1) smelt continuous casting working procedure: adopt electric arc furnace or converter mode to smelt, then send in LF refining furnace and carry out refining and through vacuum-treat, cast out blank through continuous casting operation afterwards, be referred to as continuously cast bloom;
(2) heating rolling operation: continuous oven heating rolling put into by described continuously cast bloom, heating, insulation homogenizing, adopt two-stage controlled rolling process, first stage is the austenite recrystallization stage, control reduction in pass more than 12%, subordinate phase is the austenite non-recrystallize stage, controls accumulative draft more than 70%.Carry out on-line cooling after rolling, ensure that steel plate obtains the tissue of refinement;
(3) heat treatment step: steel plate through double normalizing and accelerating cooling, and through temper, obtains finished steel plate.Normalizing temperature is 900 DEG C ~ 910 DEG C for the first time, second time normalizing temperature is 830 DEG C ~ 860 DEG C, all put into accelerating cooling medium after normalizing and carry out accelerating cooling, afterwards again through temper, tempering temperature is 660 DEG C ~ 680 DEG C, soaking time is 4 × t min(t is steel plate thickness, unit: mm), after insulation, air cooling obtains finished steel plate.Described normalizing accelerating cooling medium is water.
The steel plate physicochemical property inspection institute of the present embodiment is with sample through Simulated post-weld heat treatment, and wherein minimum simulation weldering (Min. PWHT) heat-treat condition is 690 DEG C × 3h, and maximum analog postwelding (Max. PWHT) heat-treat condition is: 690 DEG C × 20h.Embodiment steel plate physicochemical property assay as shown in table 5 and table 6.
the mechanical property of table 5 embodiment 3 steel plate after Simulated post-weld heat treatment (thickness of slab 1/2)
the maximum die welding tissue of table 6 embodiment 3 steel plate and inclusion analysis result
As can be seen from table 5, table 6, the yield tensile ratio of the low yield strength ratio chrome molybdenum steel plate of the present embodiment is lower, and plasticity and toughness are good.Crystal grain is superfine, is organized as ferrite+tempering bainite.
Claims (3)
1. the production method of the chrome molybdenum steel plate of a low yield strength ratio, described chrome molybdenum steel plate is made up of the component of following weight percentage: 0.13%≤C≤0.17%, 0.30%≤Si≤0.40%, 0.50%≤Mn≤0.70%, P≤0.007%, S≤0.005%, 1.00%≤Cr≤1.10%, 0.50%≤Mo≤0.65%, Cu≤0.20%, 0.10%≤Ni≤0.20%, Sb≤0.003%, Sn≤0.010%, As≤0.010%, surplus is Fe and inevitable impurity, steel plate thickness is 30-70mm, it is characterized in that comprising smelting continuous casting working procedure, heating rolling operation, heat treatment step, each process is as follows:
(1) smelt continuous casting working procedure: adopt electric arc furnace or converter mode to smelt, then send in LF refining furnace and carry out refining and through vacuum-treat, cast out blank through continuous casting operation afterwards;
(2) heating rolling operation: continuous oven heating rolling put into by described continuously cast bloom, heating, insulation homogenizing, adopt two-stage controlled rolling process, first stage is the austenite recrystallization stage, control draught, subordinate phase is the austenite non-recrystallize stage, carries out on-line cooling after rolling, and ensures that steel plate obtains the tissue of refinement;
(3) heat treatment step: steel plate through double normalizing and accelerating cooling, and through temper, obtains finished steel plate; Normalizing temperature is 900-930 DEG C for the first time, second time normalizing temperature is 830-860 DEG C, all put into accelerating cooling medium after normalizing and carry out accelerating cooling, afterwards again through temper, tempering temperature is 700-750 DEG C, and soaking time is 4 × t min, t is steel plate thickness, unit: mm, after insulation, air cooling obtains finished steel plate.
2. the production method of the chrome molybdenum steel plate of a kind of low yield strength ratio according to claim 1, it is characterized in that: described heating rolling operation, adopt two-stage controlled rolling process, first stage is the austenite recrystallization stage, control reduction in pass more than 12%, subordinate phase is the non-recrystallize stage rolling of austenite, ensures that accumulative draft is more than 70%, carry out on-line cooling after rolling, ensure that steel plate obtains the tissue of even refinement.
3. the production method of the chrome molybdenum steel plate of a kind of low yield strength ratio according to claim 1 and 2, is characterized in that: in described heat treatment step, accelerating cooling medium is water.
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| CN104878323B (en) * | 2015-06-05 | 2017-07-18 | 舞阳钢铁有限责任公司 | The production method of ultra-thick SA387Gr11CL2 steel plates |
| CN104947005A (en) * | 2015-06-08 | 2015-09-30 | 舞阳钢铁有限责任公司 | Large-thickness and high-performance hydroforming 14Cr1MoR steel plate and production method thereof |
| CN105695859B (en) * | 2016-03-25 | 2018-07-06 | 江苏省沙钢钢铁研究院有限公司 | A kind of high tenacity is anti-to be tempered big thickness Cr-Mo steel plates and its production method |
| CN108330387B (en) * | 2018-01-19 | 2020-08-04 | 舞阳钢铁有限责任公司 | High-toughness SA387Gr12Cl1 steel plate and production method thereof |
| CN108456827A (en) * | 2018-01-30 | 2018-08-28 | 舞阳钢铁有限责任公司 | A kind of modified adds vanadium chrome molybdenum steel plate and its production method |
| CN114959449A (en) * | 2022-04-22 | 2022-08-30 | 安阳钢铁股份有限公司 | Production method of low-yield-ratio chromium-molybdenum alloy steel |
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