CN101144138B - Producing method of steel plate for low temperature pressure container and thereof - Google Patents
Producing method of steel plate for low temperature pressure container and thereof Download PDFInfo
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Abstract
The present invention relates to a steel plate used for a low temperature pressure vessel and the production method thereof. The steel plate has the main chemical composition content (wt percent) that C is 0.12-0.19 percent, Si is 0.15-0.45 percent, Mn is 1.2-1.6 percent, Nb is 0.015-0.050 percent, Ti is 0.01-0.03 percent, Ni is 0.10-0.35 percent, Al is 0.015-0.050 percent, and P is 0-0.015 percent; S is 0-0.01 percent, and the residual is Fe and inevitable impurity. The present invention uses a new process technology of hot billet steel furnace loading, intermediate billet water cooling, controlled rolling, controlled cooling accelerating, and normalizing, which is easy to be operated, reduces the dosage of the alloying element to the lowest, in particular, largely reduces the use of theprecious metal Ni, the transverse impact power of the low temperature toughness 40 below zero is up to 164 J, transverse impact power of 30 below zero is up to 298 J, and CTOD is Delta <SUB> 0.20 </SUB> equal to 0.40 mm in the test condition that the temperature is 40 below zero. The cost of the steel type is relatively lower, the hourly output is high, the intensity is moderate, the plasticity is good, the low temperature toughness is high, the welding performance is extremely fine, and thereby the steel type can be widely applied to low temperature vessels for storing and delivering low temperature liquid in various industries and the petroleum and the chemical industry fields.
Description
Technical field
The invention belongs to metal material field, relate to a kind of production method of steel plate for low temperature pressure container.
Background technology
According to relevant documents and materials and disclosed up-to-date patented technology, heavy steel adopts V, Ti microalloying treatment technology, at present, " a kind of low temperature resistant close grain thickness direction steel plate that welds " Chinese patent application of having only Shenyang Heavy Machinery Plant's application, its application number is 94110049, the applying date is August 2 nineteen ninety-five, and the formula for a product composition has C, Mn, Si, P, S, V, Ti, Cu, Cr, Mo, Ni, Fe in this technology.The probability that has cracked when the existence of Cu element has strengthened continuous casting and heating rolling has on the one hand increased the difficulty of operating, and Mo, Cr, V element have increased cost again on the other hand, have increased carbon equivalent simultaneously, and be unfavorable to welding property.
Summary of the invention
The production method that the purpose of this invention is to provide a kind of steel plate for low temperature pressure container, this steel grade is with low cost, and the hourly output height is fit to continuous mass production very much, and its intensity is moderate, and plasticity is good, the low-temperature flexibility height, welding property is good.
The technical scheme that the present invention is taked for its technical problem of solution is: the production method of this kind steel plate for low temperature pressure container, producing the required main chemical compositions content Wt% of steel plate is: C:0.12～0.19%, Si:0.15～0.45%, Mn:1.2～1.6%, Nb:0.015～0.050%, Ti:0.01～0.03%, Ni:0.10～0.35%, Al:0.015～0.050%, P:0～0.015%; S:0～0.01%, all the other are Fe and unavoidable impurities; Crack tip opening displacement CTOD is δ under coefficient R=0.996 ,-40 ℃ of test conditionss
0.20=0.40mm uses hot steel billet shove charge, the controlled rolling of band IC cooling two-shipper frame, the positive ignition technique of ACC control cold-peace, obtains low temperature low-alloy ferrite+perlite steel plate.
The production method of described low temperature low-alloy ferrite+perlite steel plate, step is as follows:
Smelting technology: adopt converter smelting, by top blast or top bottom blowing; Adopt LF stove and the vacuum-treat of VD stove, reduce the content of obnoxious flavour such as O, H, N and S; Add alloying element, carry out microalloying; Ca handles, and feeds Si-Ca line 1～6m/t, and the control oxide morphology improves ductility and toughness;
Hot steel bloom furnaceman skill: after the continuously cast bloom cutting finishes, directly pass rollgang hot charging stove, 600～700 ℃ of billet surface charging temperatures, steel billet be in stove heat-up time 〉=2 hour, so that abundant molten the getting back in the austenite of the alloying elements such as Nb of separating out; 1150～1180 ℃ of the final Heating temperatures of steel billet;
Rolling process for cooling: adopt the two stages controlled rolling of two-shipper frame, it is rolling that roughing mill carries out 〉=980 ℃ perfect recrystallization, and intermediate blank is carried out the IC cooling then; Finishing mill carries out the controlled rolling of non-recrystallization district, and rolling temperature is controlled at 930 ℃～870 ℃, cumulative deformation 〉=60%; Roll the back steel plate and quicken cooling immediately, 10～15 ℃/S of cooling rate, final cooling temperature is controlled between 680～630 ℃.
Normalizing process: 890～910 ℃ of normalizing treatment temperature, soaking time 1.2～2.0min/mm in the stove, individual keeps flat to be positioned over the ventilation after normalized steel plate is come out of the stove, and steel plate is collected temperature＜150 ℃.
Alloying element and the main effect of quantity in the low-temperature pressure vessel steel plate thereof that the present invention selects are:
C: carbon produces remarkably influenced to intensity, low-temperature impact toughness, the welding property of steel.Be that carbon content can not be too high in the main exploitation purpose steel with the Cryogenic Steel, carbon content is crossed low it and the micro alloying element of can making and is formed carbide, the reduction of carbonitride growing amount, influences the controlled rolling effect.Therefore, the best carbon content of the present invention's setting is 0.12%～0.19%.
Si: Si content is controlled at 0.15%～0.5% among the present invention, and Si mainly improves the intensity of steel with the solution strengthening form, surpass at 0.5% o'clock, can cause the toughness of steel to descend, and fracture appearance transition tem simultaneously more consumingly raises.
Mn: Mn content is controlled at 1.2%～1.6% among the present invention, Mn's is with low cost, and its solution strengthening effect meeting is risen the tensile strength of steel significantly, and manganese can improve the hot workability of steel, reduce the cold shortness of steel, thus among the present invention Mn as main alloy element.
Nb:Nb is an important interpolation element of the present invention, Nb is easy to C can hinder growing up of austenite crystal in conjunction with the carbide that generates in the operation of rolling, postpone austenitic recrystallize, simultaneously can improve austenite recrystallization and stop temperature, realize that strict non-recrystallization district is rolling, promote the refinement of ferrite crystal grain, improve intensity and flexible effect to play.In view of the above-mentioned vital role of Nb, the present invention is controlled at 0.015%～0.050% with the content of Nb.
The effect of Ti:Ti is very similar with the effect of Nb, the Ti that adds trace makes itself and N in the steel form TiN, TiN can stop steel billet heat, crystal grain grows up in rolling, the welding process, improve the toughness of mother metal and welded heat affecting zone, this is the effect of Ti crystal grain thinning; Secondly, Ti is the N element in the steel fixedly, and it is poor that Ti is lower than 0.005% nitrogen fixation effect, surpasses at 0.03% o'clock, and residue Ti can worsen the toughness of steel.Therefore among the present invention the content of Ti is controlled at 0.01%～0.03%.
Ni: be weak solution strengthening element, the main effect in steel is to increase austenitic cold energy power excessively, thus thinning microstructure, the effect that is strengthened, impact toughness and fracture appearance transition tem have desirable influence.Therefore among the present invention the content of Ni is controlled at 0.10%～0.35%.
Al:Al is a deoxidant element, and the AlN that forms in the steel is crystal grain thinning effectively, and content 0.015%～0.05% is comparatively suitable.
Impurity content in the steel is the smaller the better, and the upper limit is controlled at P≤0.015%, and S≤0.01% is advisable, although can be null value in theory, in the reality P, S element being controlled to zero is the comparison difficulty, therefore must limit the upper limit.
The present invention uses hot steel billet shove charge, intermediate blank water-cooled (IC), controlled rolling (TMCP), adds the novel technique of easy handlings such as speed control cold (ACC), normalizing, and fully unite the effect of using various alloying elements, drop to the consumption of alloying element minimum, especially significantly reduced the use of valuable Ni metal, low-temperature flexibility-40 a ℃ transverse impact merit reaches 164J,-30 ℃ of transverse impact merits reach 298J, and CTOD is δ 0.20=0.40 (mm) under-40 ℃ of test conditionss.This steel grade cost is relatively very cheap, and the hourly output height is fit to continuous mass production very much.This steel grade intensity is moderate, and plasticity is good, the low-temperature flexibility height, welding property is very good, can be widely used in that all trades and professions are stored and transporting low temperature liquid with fields such as low-temperature pressure container and oil, chemical industry.
Embodiment
According to composition design provided by the invention and production technique, provide-40 ℃ and-30 ℃ of two impact temperature examples.Except that this specification sheets illustrated, present embodiment adopts continuously cast bloom size 270 * 1600 * 2800mm, the hot charging furnace temperature is below 680 ℃, 1160 ℃ of Heating temperatures, the two stages controlled rolling of two-shipper frame, IC cools off intermediate blank, finishing mill accumulated deformation rate 64%, 930～900 ℃ of start rolling temperatures, 870～890 ℃ of finishing temperatures, cooling rate 10-15 ℃/S, 680～630 ℃ of final cooling temperatures, 890～900 ℃ of heat treatment furnace temperature, time inside furnace 40～60 minutes.The chemical ingredients of example sees Table 1, and the object performance assay sees Table 2.
From table 1 and table 2 data as can be seen, the steel capital of two kinds of specifications has that intensity is moderate, plasticity good, the characteristics that low-temperature flexibility is high, and cost is cheap relatively in addition, the hourly output height, so steel for low-temperature pressure container is a kind of Cryogenic Steel that very is fit to continuous mass production, has high performance-price ratio.
The practical chemical ingredients example (Wt%) of a kind of steel plate for low temperature pressure container of table 1 the present invention
| C | Si | Mn | P | S | Nb | Ni | Ti | Al | |
| Example 1 | 0.16 | 0.22 | 1.29 | 0.012 | 0.006 | 0.028 | 0.19 | 0.024 | 0.030 |
| Example 2 | 0.17 | 0.33 | 1.43 | 0.010 | 0.004 | 0.037 | 0.25 | 0.023 | 0.040 |
| Example 3 | 014 | 0.33 | 1.40 | 0.008 | 0.001 | 0.037 | 0.28 | 0.023 | 0.027 |
| Example 4 | 0.15 | 0.30 | 1.37 | 0.014 | 0.002 | 0.032 | 0.25 | 0.019 | 0.038 |
| Example 5 | 0.18 | 0.26 | 1.36 | 0.009 | 0.002 | 0.035 | 0.26 | 0.019 | 0.031 |
| Example 6 | 0.15 | 0.26 | 1.32 | 0.010 | 0.008 | 0.025 | 0.23 | 0.023 | 0.031 |
The object performance of the practical chemical ingredients of a kind of steel plate for low temperature pressure container of table 2 the present invention
The present invention is not limited to the foregoing description, requires and manufacturing technique requirent according to composition provided by the invention, all can implement.
Claims (2)
1. the production method of a steel plate for low temperature pressure container is characterized in that,
The main chemical compositions content wt% of described steel plate is: C:0.12～0.19%, Si:0.15～0.45%, Mn:1.2～1.6%, Nb:0.015～0.050%, Ti:0.01～0.03%, Ni:0.10～0.35%, Al:0.015～0.050%, P:O～0.015%; S:0～0.01%, all the other are Fe and unavoidable impurities; Crack tip opening displacement CTOD is δ under coefficient R=0.996 ,-40 ℃ of test conditionss
0.20=0.40mm uses hot steel billet shove charge, the controlled rolling of band IC cooling two-shipper frame, the positive ignition technique of ACC control cold-peace, obtains low temperature low-alloy ferrite+perlite steel plate;
Step is as follows:
Smelting technology: adopt converter smelting, by top blast or top bottom blowing; Adopt LF stove and the vacuum-treat of VD stove, reduce the content of O, H, N obnoxious flavour and S; Add alloying element, carry out microalloying; Ca handles, and feeds Si-Ca line 1～6m/t, and the control oxide morphology improves ductility and toughness;
Hot steel bloom furnaceman skill: after the continuously cast bloom cutting finishes, directly pass rollgang hot charging stove, 600～700 ℃ of billet surface charging temperatures, steel billet be in stove heat-up time 〉=2 hour, so that abundant molten the getting back in the austenite of the Nb alloying element of separating out; 1150～1180 ℃ of the final Heating temperatures of steel billet;
Rolling process for cooling: adopt the two stages controlled rolling of two-shipper frame, it is rolling that roughing mill carries out 〉=980 ℃ perfect recrystallization, and intermediate blank is carried out the IC cooling then; Finishing mill carries out the controlled rolling of non-recrystallization district, and rolling temperature is controlled at 930 ℃～870 ℃, cumulative deformation 〉=60%; Roll the back steel plate and quicken cooling immediately, 10～15 ℃/s of cooling rate, final cooling temperature are controlled between 680～630 ℃;
Normalizing process: 890～910 ℃ of normalizing treatment temperature, soaking time 1.2～2.0min/mm in the stove, individual keeps flat to be positioned over the ventilation after normalized steel plate is come out of the stove, and steel plate is collected temperature＜150 ℃.
2. produce the method for steel plate for low temperature pressure container according to claim 1, it is characterized in that, main chemical compositions content wt% is: C:0.16%, Si:0.22%, Mn:1.29%, Nb:0.028%, Ti:0.024%, Ni:0.10～0.35%, Al:0.03%, P:0.012%; S:0.006%, all the other are Fe and unavoidable impurities.
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