CN102041433A - X70 steel plate for low-cost pipe fittings and production method thereof - Google Patents
X70 steel plate for low-cost pipe fittings and production method thereof Download PDFInfo
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Abstract
The invention discloses an X70 steel plate for low-cost pipe fittings and a production method thereof. The steel plate comprises the following chemical components in percentage by mass (unit, wt%): 0.04-0.08% of C, 0.20-0.40% of Si, 1.50-1.65% of Mn, less than or equal to 0.010% of P, less than or equal to 0.005% of S, less than or equal to 0.40% of micro-alloy elements (V, Nb, Ti, Mo and Ni), less than or equal to 0.050% of Als, and the balance of Fe and residual elements. The production method disclosed by the invention comprises the following steps: hot metal pretreatment, smelting with a converter, LF (ladle furnace) refining, VD (vacuum degassing) vacuum refining, continuous casting, heating, rolling, cooling control and slow cooling of stack. The steel purity is ensured with LF+VD process by reasonably adopting the chemical component deign of low carbon, low manganese and multiple composite micro-alloy elements, and the total level of various impurities is not over 3.0; the grain size of the steel can reach 11-12th level through the treatment of rolling control, cooling control and normalization; and the 16-25 mm X70 steel plate for the pipe fittings are successfully produced through the effective implementation of abovementioned measures.
Description
Technical field
The present invention relates to steel, be specifically related to a kind of low-cost pipe fitting steel X70 steel plate and production method thereof.
Background technology
China's zone Energy resources compose storage and the regional development level does not match very much, and particularly the Energy production and the energy expenditure of coastal region, east and central and west regions exist significant difference, and West-East National Gas Transmission Project is built in allwork on July 4th, 2002.Estimate that after 2 years, the natural gas line of a long-distance large-caliber will extend to white crane town, Shanghai from the Tarim Basin, Xinjiang, become the energy transmission Aorta that traverses China." nearly 2,070,000 tons of West-east Gas pipeline trunk mains, nearly 10,000,000,000 yuan of total value with steel.But the fine pipeline steel is one " bottleneck " of China's metallurgy industry development always.
At present, known X70 grade steel plate production difficulty is big, and the production cycle is long, and the enterprise of general equipment difference is difficult to produce the pipe line steel that cost is low, quality is high.As pipe fitting steel X70, owing to the technical protocol requirement is lower slightly than the pipe line steel requirement, therefore production is low slightly, and alloy addition level was big when still domestic steel were produced such steel plate, and cost is very high.
Summary of the invention
At the problems referred to above, grope through the contriver, obtain a kind of low-cost pipe fitting steel X70 steel plate and production method thereof, thereby finished the present invention.
Therefore, the object of the present invention is to provide a kind of thickness at the pipe fitting of 12-25mm steel X70 steel plate.
Another object of the present invention is to provide the production method of this steel plate.
For achieving the above object, the technical scheme that the present invention takes be thickness the pipe fitting of 16-25mm with steel X70 steel plate comprise following chemical components in mass percent (unit, wt%):
C:0.04～0.08, Si:0.20～0.40, Mn:1.50～1.65, P :≤0.010, S :≤0.005, micro alloying element (V+Nb+Ti+Mo+Ni) :≤0.40, Als :≤0.050, other is Fe and relict element.
Carbon equivalent [Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15] :≤0.30.
The function analysis of above-mentioned chemical element is as follows:
C: be most basic strengthening element in the steel, improve intensity, but C influences the welding property of steel and influences toughness.Take all factors into consideration, the content of carbon is hanging down of control as far as possible.
Si: be the solution strengthening element, favourable to the intensity that improves steel plate.
Mn: be the solution strengthening element, all favourable to intensity and the toughness that improves steel plate.
P: unfavorable to welding, and have certain cold shortness, and in this steel grade, belong to harmful element, that should control is low as far as possible.
S: easily form the MnS type impurity, have certain red brittleness, belong to harmful element in this steel grade, that should control is low as far as possible.
V, Nb, Ti: in steel, can combine, form fine carbide or carbonitride, can play crystal grain thinning and dispersion-strengthened action, thereby reach the net effect of the obdurability of effective raising steel with C, N.
Mo: the effect of solution strengthening is played in an amount of adding, can effectively reduce γ → α transformation rate, suppress polygonal ferrite and perlite forming core, promote the acicular ferrite or the microtexture ULCB forming core of high density dislocation substructure, guarantee the steel plate high-intensity high-tenacity.
Al: can play the crystal grain thinning strengthening effect.
Ni: both improved the intensity of steel on the one hand strongly, the aspect makes the toughness of iron keep high level again all the time in addition.Its temperature that becomes fragile is then extremely low.Lattice parameter and the γ-iron phase of Ni are near, so can become continuous solid solution.This just helps improving the hardenability of steel, and Ni can reduce stagnation point and increase austenitic stability, so its quenching temperature can reduce, hardening capacity is good.
Described pipe fitting uses steel X70 steel plate thickness at 12-40mm, Ceq＜0.30.
For achieving the above object, the production method that the present invention takes comprises: hot metal pretreatment, converter smelting, LF refining, VD vacuum refinement, continuous casting steel machine, heating, rolling, cold, the stacking slow cooling of control, in described converter smelting, tapping carbon 0.01～0.03%, tapping P≤0.012%, S≤0.010%; Point blows number of times and must not avoid slag under the tapping process greater than 2 times; In described LF refining, take the big quantity of slag to carry out slag making, guarantee that the white slag sludging time is controlled in the 15min, avoid the rare phenomenon of slag to take place; In described vacuum refinement, the dwell time under≤67Pa is controlled by 〉=20min; Pine in described adding, the holding temperature of process furnace is controlled at 1200 ℃～1220 ℃; Described rolling in, 1020 ℃～1120 ℃ of start rolling temperatures; One stage finishing temperature is at 950 ℃～1000 ℃, and the two-stage start rolling temperature is at 880～920 ℃, and the two-stage takes to depress for a short time rolling, to guarantee original plate shape, 800～860 ℃ of finishing temperatures; In described control is cold, return 480～520 ℃ of red temperature, cooling rate is controlled at 15～20 ℃/s; In described slow cooling, go into burial pit temperature 〉=300 ℃; Cooling in heap time 〉=24 hour.
By reasonably taking the chemical composition design of the composite micro-alloyed element of the low many units of manganese ﹑ of low carbon ﹑, LF+VD technology guarantees the cleanliness factor of steel, reach each type impurity rank summation and be no more than 3.0, make the grain fineness number of steel reach 11～12 grades by controlled rolling and controlled cooling+normalizing treatment, by the above-mentioned effective enforcement that waits measure, successfully produced the pipe fitting steel X70 steel plate of 16-25mm.
Hot metal pretreatment is rectified and improved process to the steel plate stacking slow cooling, worked out strict process point control standard, and strict the execution, the quality in kind of product has reached X70 level level, the performance surplus capacity is bigger, wherein surrender surplus capacity at 80～100Mpa, the tension surplus capacity is at 30～150Mpa, and the elongation surplus capacity is 5～15%.
Description of drawings
Below in conjunction with accompanying drawing, the present invention is further elaborated.
Fig. 1 is the metallographic structure figure (200X) of TMCP of the present invention after rolling.
Embodiment
The technical scheme that the present invention takes be thickness the pipe fitting of 16-25mm with steel X70 steel plate comprise following chemical components in mass percent (unit, wt%):
C:0.04～0.08, Si:0.20～0.40, Mn:1.50～1.65, P :≤0.010, S :≤0.005, micro alloying element (V+Nb+Ti+Mo+Ni) :≤0.40, Als :≤0.050, other is Fe and relict element.
Carbon equivalent [Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15] :≤0.30.
The production method that the present invention takes comprises: hot metal pretreatment, converter smelting, LF refining, VD vacuum refinement, continuous casting steel machine, heating, TMCP is rolling, control is cold, stacking slow cooling, in described converter smelting, tapping carbon 0.03～0.04%, tapping P≤0.012%, S≤0.010%; Point blows number of times and must not avoid slag under the tapping process greater than 2 times; In described LF refining, take the big quantity of slag to carry out slag making, guarantee that the white slag sludging time is controlled in the 15min, avoid the rare phenomenon of slag to take place; In described vacuum refinement, the dwell time under≤67Pa is controlled by 〉=20min; Pine in described adding, the holding temperature of process furnace is controlled at 1200 ℃～1220 ℃; Described rolling in, 1020 ℃～1120 ℃ of start rolling temperatures; One stage finishing temperature is at 950 ℃～1000 ℃, and the two-stage start rolling temperature is at 880～920 ℃, and the two-stage takes to depress for a short time rolling, to guarantee original plate shape, 800～860 ℃ of finishing temperatures; In described control is cold, return 480～550 ℃ of red temperature, cooling rate is controlled at 15～25 ℃/s; In described slow cooling, go into burial pit temperature 〉=300 ℃; Cooling in heap time 〉=24 hour.
Embodiment 1
By hot metal pretreatment, converter smelting, LF refining, VD vacuum refinement, continuous casting steel machine, heating, TMCP is rolling, control is cold, stacking slow cooling technology, obtain Q550D (E) the finished product steel plate of chemical ingredients as described in Table 1, wherein each processing parameter and mechanical property see the following form 4,5.
Table 1 embodiment 1 steel chemical composition
Embodiment 2
By hot metal pretreatment, converter smelting, LF refining, VD vacuum refinement, continuous casting steel machine, heating, TMCP is rolling, control is cold, stacking slow cooling technology, obtain Q550D (E) the finished product steel plate of chemical ingredients as described in Table 1, wherein each processing parameter and mechanical property see the following form 4,5.
The chemical ingredients of table 2 embodiment 2 steel
Embodiment 3
By hot metal pretreatment, converter smelting, LF refining, VD vacuum refinement, continuous casting steel machine, heating, TMCP is rolling, control is cold, stacking slow cooling technology, obtain Q550D (E) the finished product steel plate of chemical ingredients as described in Table 1, wherein each processing parameter and mechanical property see the following form 4,5.
The chemical ingredients of table 3 embodiment 3 steel
Operational path of the present invention: KR hot metal pretreatment → converter smelting → LF refining → VD vacuum metling → continuous caster cast → steel billet slow cooling → strand heating → steel billet dephosphorization → TMCP is rolling → controlled chilling → steel plate aligning → stacking slow cooling → surface inspection → finishing → flaw detection → service check → salable product warehouse-in.
1.1 steel-making part
1.1.1 composition design
Because the demanding yield strength of this steel plate guarantees that yield strength, tensile strength and elongation, the ballistic work of steel plate is difficult point and emphasis, must take all factors into consideration in the composition design, just can reach the unification of intensity and plasticity and toughness.Consider that the ferritic-pearlitic steel is difficult to reach the impelling strength requirement of other intensity of 550Mpa level and-40 ℃ on intensity, therefore adopt low-carbon (LC), the high route that adds the composition design of multicomponent microalloyings such as V, Nb, Ti, Mo, B suddenly, by in the strand operation of rolling to the control of controlled rolling and cooling control technology, thereby the intensity of efficiently solving and plasticity and toughness are taken into account unified problem.Good for guaranteeing the steel plate internal soundness, adopt the Clean Steel smelting technology simultaneously, [P], [S], [N], [H], [O] five big harmful element content in the steel of keeping under strict control.
1.1.2 KR hot metal pretreatment technology point requirement
Before the molten iron that arrives at a station must be taken off slag with take off the back slag, guarantee liquid level thickness of slag layer≤20mm, molten iron guarantees molten iron S≤0.005% after the KR stirring desulphurization, assurance desulfurization cycle≤21min, desulfurization temperature drop≤20 ℃.
1.1.3 converter smelting process point requirement
Control according to the Melting Process for Low Carbon Steel standard, tapping C is controlled at 0.03～0.05%, and tapping P≤0.012% is avoided slag under the tapping process.
1.1.4 LF refinery practice point requirement
[adopt big quantity of slag technology to carry out slag making operation, guarantee that the white slag hold-time is controlled at more than the 18min, stop the shoddye phenomenon; Carry out the Argon operation in strict accordance with the Argon standard, forbid blowing cruelly.
1.1.5 VD vacuum refining process point requirement
VD vacuum tightness must reach below the 67Pa, and the dwell time is necessary 〉=18min, soft blow 3～5min or do not blow behind the vacuum breaker, and molten steel must not expose.
1.1.6 continuous casting process point requirement
Guarantee that the casting machine status of equipment is good before watering steel; 15 ± 5 ℃ of middle bag superheating temperature; pulling rate: 0.7m/min; specific water: 0.80L/ ㎏; electricity stirs: 900A, 5Hz, 30s-3-30s; continuous-casting steel pouring requires the whole process protection casting, unwraps greatly and waters necessary cover protective tube in the 1min of back, must guarantee not show of molten steel face in the middle bag casting process.Rationally control stopper Argon amount in the steel pouring process, guarantee that liquid level fluctuation of crystallizer is slight.
1.1.7 strand management
Going into special-purpose burial pit after the strand cutting is rolled off the production line carries out more than the slow cooling 24h.
1.2 steel rolling process point control requirement
1.2.1 heating process point requirement
The strand heating is controlled in strict accordance with III group steel heating process,, maximum heating temperature is 1240 ℃.
1.2.2 rolling technology point requirement
The rolling requirement of " high temperature, low speed, depress greatly ", 1050 ℃～1150 ℃ of start rolling temperatures are adhered in strictness; Adopt TMCP rolling, cool steel thickness is 80-100mm, permeate for guaranteeing distortion,, working roll rolling line speed is pressed≤1.5m/s control, and a stage finishing temperature is at 950 ℃～1000 ℃.The two-stage start rolling temperature is below 920 ℃, and the two-stage takes to depress for a short time rolling, guaranteeing original plate shape, and finishing temperature≤860 ℃.
1.2.3 cooling control technology point requirement
Go into ACC after steel plate rolls and cool off fast, go into water temp＞760 ℃, return 550～600 ℃ of red temperature controls, cooling rate is controlled at 10～15 ℃/s, is sent to powerful straightener then and carries out hot straightening.
1.2.4 retarded cooling process
Carry out slow cooling after steel plate rolls off the production line, go into burial pit temperature 〉=300 ℃; The cooling in heap time is not less than 24 hours;
2.1 chemical ingredients
For guaranteeing good welding property and good plasticity and toughness, in composition design internal control scope, adopt low-carbon (LC) control, guaranteeing the high-intensity steel plate plasticity and toughness of taking into account simultaneously of steel plate, low carbon content has guaranteed steel plate welding property excellence; Mn is one of crystal grain thinning element, in order to improve intensity, reduces the steel brittle transition temperature, improve low-temperature impact toughness, but during the Mn too high levels, unfavorable to toughness and welding property, and cause the Mn segregation easily, flaw detection is had certain influence, so Mn content is controlled at about 1.60%.V, Nb element can suppress the ausforming recrystallize, stop austenite crystal to be grown up, and can also play the effect of precipitation strength simultaneously, and the compound add-on of Nb ﹑ V ﹑ Ti is controlled between 0.10～0.15.It is stable austenite that the adding of Mo, B mainly acts on, and suppresses polygonal ferrite and compares with perlite, promotes bainite to compare, and add-on is controlled between 0.15～0.25.P, S content are controlled in the lower scope, guarantee the clean inclusion-free of steel plate.
2.1.1 surface quality requires to press the strict execution of GB/T709-2008, thickness deviation is pressed category-B;
2.1.2 flaw detection is carried out JB/T2970-2004 III level non-destructive testing standard and is carried out;
2.1.3 composition and mechanical mechanics property are pressed GB/T21237-2007 and are carried out, and specifically see Table 4.
Table 4 X70 steel plate mechanical mechanics property
This produces 30 batches of X70 steel plates altogether as a trial, 20 batches of the thick X70 steel plates of 16mm, 20 batches of 20mmX70 steel plates wherein: yield strength is controlled at 540～680 MPa, has on average reached 600 MPa, than the rich 70MPa of standard; Tensile strength is controlled at 680～810 MPa, has on average reached 750 MPa, than the rich 80MPa of standard; Elongation is controlled at 33%～51%, on average reaches 36%, than standard affluence 2%;-20 ℃ of V-type ballistic works are controlled at 300-390 J, have on average reached 340 J, and performance index have satisfied the development requires of X70 pipe fitting steel fully.
2.3 examine outward and detect a flaw
The steel plate of being developed is examined outward, and the percentage of A-class goods 100% is detected a flaw by JB/T 2970-2004, and unification level rate is 60%, and closing three grades of rates is 100%, has reached desired result.
2.4 metallographic examination
Metallographic examination is carried out in the sampling of product thickness 1/4 place, be the results are shown in Figure 1.
Table 5 product metallographic examination result
Associative list 5 and Fig. 1 analysis, steel plate inclusion summation are rolled the back steel plate and are organized as B less than 2.5, and grain fineness number reaches 11.0～12.0 grades.
Claims (2)
1. a low-cost pipe fitting is with steel X70 steel plate, this steel plate comprise following chemical components in mass percent (unit, wt%):
C:0.04～0.08, Si:0.20～0.40, Mn:1.50～1.65, P :≤0.010, S :≤0.005, micro alloying element (V+Nb+Ti+Mo+Ni) :≤0.40, Als :≤0.050, other is Fe and relict element.
2. a low-cost according to claim 1 pipe fitting is with the production method of steel X70 steel plate, and this method comprises: hot metal pretreatment, converter smelting, LF refining, VD vacuum refinement, continuous casting steel machine, heating, rolling, cold, the stacking slow cooling of control; It is characterized in that in described converter smelting tapping carbon 0.01～0.03%, tapping P≤0.012%, S≤0.010%; Point blows number of times and must not avoid slag under the tapping process greater than 2 times; In described LF refining, take the big quantity of slag to carry out slag making, guarantee that the white slag sludging time is controlled in the 15min, avoid the rare phenomenon of slag to take place; In described vacuum refinement, the dwell time under≤67Pa is controlled by 〉=20min; Pine in described adding, the holding temperature of process furnace is controlled at 1200 ℃～1220 ℃; Described rolling in, 1020 ℃～1120 ℃ of start rolling temperatures; One stage finishing temperature is at 950 ℃～1000 ℃, and the two-stage start rolling temperature is at 880～920 ℃, and the two-stage takes to depress for a short time rolling, to guarantee original plate shape, 800～860 ℃ of finishing temperatures; In described control is cold, return 480～520 ℃ of red temperature, cooling rate is controlled at 15～20 ℃/s; In described slow cooling, go into burial pit temperature 〉=300 ℃; Cooling in heap time 〉=24 hour.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102345058A (en) * | 2011-06-28 | 2012-02-08 | 南阳汉冶特钢有限公司 | X65 steel plate for pipe fittings and production method thereof |
| CN102676949A (en) * | 2012-03-08 | 2012-09-19 | 江苏沙钢集团有限公司 | Hot-rolled steel plate for coal slurry conveying pipe and manufacturing method thereof |
| CN103394519A (en) * | 2013-07-10 | 2013-11-20 | 内蒙古包钢钢联股份有限公司 | Method for controlling shapes of thin steel plates |
| CN103725857A (en) * | 2013-12-27 | 2014-04-16 | 内蒙古包钢钢联股份有限公司 | Method for improving strength of Q550D steel plate |
| CN107868900A (en) * | 2017-11-20 | 2018-04-03 | 南阳汉冶特钢有限公司 | A kind of ultralow phosphorus faces the production method of hydrogen steel |
| CN111519083A (en) * | 2020-05-14 | 2020-08-11 | 南京钢铁股份有限公司 | Production method of extremely-low-cost manganese-containing thick-specification outlet pipeline steel |
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| CN101880824A (en) * | 2010-06-14 | 2010-11-10 | 南阳汉冶特钢有限公司 | Q345q-series super-thick bridge steel plate and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102345058A (en) * | 2011-06-28 | 2012-02-08 | 南阳汉冶特钢有限公司 | X65 steel plate for pipe fittings and production method thereof |
| CN102676949A (en) * | 2012-03-08 | 2012-09-19 | 江苏沙钢集团有限公司 | Hot-rolled steel plate for coal slurry conveying pipe and manufacturing method thereof |
| CN102676949B (en) * | 2012-03-08 | 2014-03-19 | 江苏沙钢集团有限公司 | Hot-rolled steel plate for coal slurry conveying pipe and manufacturing method thereof |
| CN103394519A (en) * | 2013-07-10 | 2013-11-20 | 内蒙古包钢钢联股份有限公司 | Method for controlling shapes of thin steel plates |
| CN103725857A (en) * | 2013-12-27 | 2014-04-16 | 内蒙古包钢钢联股份有限公司 | Method for improving strength of Q550D steel plate |
| CN107868900A (en) * | 2017-11-20 | 2018-04-03 | 南阳汉冶特钢有限公司 | A kind of ultralow phosphorus faces the production method of hydrogen steel |
| CN107868900B (en) * | 2017-11-20 | 2019-03-19 | 南阳汉冶特钢有限公司 | A kind of ultralow phosphorus faces the production method of hydrogen steel |
| CN111519083A (en) * | 2020-05-14 | 2020-08-11 | 南京钢铁股份有限公司 | Production method of extremely-low-cost manganese-containing thick-specification outlet pipeline steel |
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Application publication date: 20110504 |