CN102676949A - Hot-rolled steel plate for coal slurry conveying pipe and manufacturing method thereof - Google Patents
Hot-rolled steel plate for coal slurry conveying pipe and manufacturing method thereof Download PDFInfo
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Abstract
The invention relates to a hot-rolled steel plate for a coal slurry conveying pipe and a manufacturing method and aims at realizing the production of the hot-rolled X65-X70 steel plate with the advantages of high strength and toughness, low yield-tensile ratio, easiness in welding, wear resistance and corrosion resistance for the coal slurry conveying pipe. The steel plate comprises the following chemical components in percentage by weight: 0.05-0.10% of C, 0.20-0.40% of Si, 1.20-1.7% of Mn, 0.015-0.06% of Al, 0.03-0.06% of Nb, 0.010-0.020% of Ti, not more than 0.30% of Cu, not more than 0.30% of Ni, not more than 0.50% of Cr, not more than 0.015% of P, not more than 0.005% of S, not more than 0.006% of N, not more than 0.05% of V, not more than 0.0005% of B, not more than 0.41 of Ceq, not more than 0.20 of Pcm and the balance of Fe and impurities. The steel plate disclosed by the invention is suitable for processing wear-resistant and corrosion-resistant longitudinal submerged arc welded pipes for long-distance, high-conveying-pressure and above-medium-concentration coal slurry conveying.
Description
Technical field
The present invention relates to a kind of hot-rolled steel sheet and preparation technology thereof, relate in particular to a kind of paste materials such as heavy caliber coal slurry that can be used for and carry hot-rolled steel sheet with welded tube and preparation method thereof, belong to the technical field of micro-alloying low-alloy rolling controlled and cooling controlled steel.
Background technology
Coal is the main basic energy resource of China, but its resource distribution is extremely unbalanced, and eastern Shaoxi is many, and Nan Shaobei is many, and the reserves of 60%-70% concentrate on Shanxi, Shaanxi and West Inner Mongolia, main railway and the highway of relying on of transportation.Become coal water slurry to pass through pipe-line transportation coal conversion, can improve conveying efficiency greatly and cut operating costs significantly, can also effectively reduce factor such as weather to the influence of Coal Transport with realize high-efficiency environment friendly.Compare with the railway of building equal transport power, highway, the comprehensive method of investment of pipeline coal transporting engineering has only the former 1/3-1/5, the cost of transportation only be equivalent to railway 1/2 with highway 1/5.The U.S. built up in 1973 come into operation from the Fei Maisha open coal mine to the Hei Maisha convey coal pipe of Hough power plant not, 440 kilometers of total lengths, 450 millimeters of calibers, grade of steel are the X52 pipe line steel, 5,000,000 tons of year coal-feeding quantities.727 kilometers of refreshing Weihe coal slurry pipeline total lengths that China Shaanxi coal industry chemical industry group planned investment 7,000,000,000 is built, the straight-line joint submerged arc welding tube of X65 Φ 610mm * 17.5mm is adopted in design, the highest transfer pressure 13MPa, 10,000,000 tons in year conveying coal.This pipeline will become at present that span is the longest in the world, grade of steel is the highest, caliber is maximum, year maximum coal slurry transport pipe of fortune coal; Its technical requirements hot-rolled steel sheet except that have HS, H.T., low yield strength ratio, the easy weldableness; Also must have higher wear resistance and corrosion resistance nature, can not satisfy the steel grade that aforementioned techniques requires fully both at home and abroad but also have so far.
Summary of the invention
The objective of the invention is to provides a kind of coal slurry transfer lime to use hot-rolled steel sheet to deficiency of the prior art, and it is applicable to that long distance, high transfer pressure, medium above concentration coal slurry conveying are with the wear-resisting processing that undermines corrosion-resistant straight-line joint submerged arc welding tube.
Another object of the present invention is to provide a kind of preparation method who prepares aforementioned coal slurry transfer lime with hot-rolled steel sheet.
For realizing the foregoing invention purpose, the present invention has adopted following technical scheme:
A kind of coal slurry transfer lime is used hot-rolled steel sheet; Comprise the following chemical composition of counting by weight percentage: carbon 0.05～0.10%, silicon 0.20～0.40, manganese 1.20～1.7%, aluminium 0.015～0.06%, niobium 0.03～0.06%, titanium 0.010～0.020%, copper≤0.30%, nickel≤0.30%, chromium≤0.50%, phosphorus≤0.015%, sulphur≤0.005%, nitrogen≤0.006%, vanadium≤0.05%, boron≤≤0.0005%, and the iron of surplus and impurity;
Each staple of this steel grade is chosen foundation as follows:
Carbon (C): carbon is the principal element that influences pipe line steel intensity, toughness, hardness and welding property, and the increase of carbon content has obvious effect to intensity and the hardness that improves steel.But the increase meeting of carbon content has negative impact to ductility, toughness and the welding property of steel.So the carbon content that the present invention selects is 0.06-0.10%, mainly be to consider that low carbon can make the yield tensile ratio of steel plate increase on the one hand, mainly be to consider the toughness of steel plate and good welding property on the other hand.
Manganese (Mn): the solution strengthening element, both can improve the intensity and the hardness of steel, also can improve the toughness of steel.Appropriateness improves the hardening capacity of steel, enlarges the γ phase region, reduces the γ → α transformation temperature of steel, helps to obtain tiny phase-change product.In addition, manganese can also improve the solubleness of microalloy element niobium (Nb) in steel, suppresses separating out of carbon niobium nitride.Therefore, the manganese content of steel employing of the present invention is 1.2～1.7%.
Niobium (Nb): niobium is effective grain refining element, can grow up by the obvious suppression austenite crystal, postpones γ → α and changes, thereby obtain more tiny tissue.In course of hot rolling, the carbon niobium nitride of separating out can postpone the growth process of recrystallize and crystal grain, and the carbon niobium nitride is through the pinning dislocation, makes can keep more dislocation desity in the matrix, improves the intensity and the toughness of steel.The niobium of solid solution condition can postpone γ → α to be changed, the refinement ferrite crystal grain, and the toughness of raising steel, the niobium of solid solution can continue to separate out with Nb (CN) in process of cooling, further improves the intensity of steel.The niobium that steel of the present invention adopts is 0.03-0.06%.
Titanium (Ti): titanium is strong nitrogen killer, can form the TiN particle with nitrogen, thereby can in the blank heating process, suppress the alligatoring of austenite crystal, plays the effect of crystal grain thinning, improves the low-temperature flexibility of steel; Equally, the TiN particle can play the good restraining effect to growing up of welded heat affecting zone crystal grain, improves welding property.In addition, titanium can be separated out with niobium is compound, improves (TiNb) thermostability (CN), to blank austenite crystal in the heat-processed grow up and the good restraining effect is played in the alligatoring of welded heat affecting zone crystal grain, improve the toughness of steel plate, improve the welding property of steel plate.The add-on of titanium generally is not less than 3.4 times of nitrogen, and the add-on of titanium is 0.010-0.020% in the steel of the present invention.
Molybdenum (Mo): molybdenum can improve the intensity and the hardness of steel, adds molybdenum in the steel and reduces transformation temperature, separates out ferritic earlier when suppressing γ → α phase transformation and forms, and promotes bainite transformation, and makes structure refinement; In containing the niobium steel, add molybdenum in addition and can also improve Nb (C, precipitation strength effect N).Steel of the present invention has adopted and has been not more than 0.2% add-on.
Copper (Cu): copper can improve the intensity of steel plate and welded heat affecting zone, and the precipitating action of copper can also improve the anti-fatigue performance of steel; In addition, another effect of copper is the corrosion resistance nature that improves steel plate, closely adds the resistance to atmospheric corrosion that 0.1% copper just can significantly improve steel.But excessive copper is disadvantageous to the toughness of welded heat affecting zone and welding zone, and steel of the present invention has adopted and has been not more than 0.3% add-on.
Chromium (Cr): chromium is carbide forming element equally, can improve steel plate hardness, plays the effect of precipitation strength; Chromium can obtain more acicular ferrite structure as ferrite former in high Nb steel; Chromium can also improve the anticorrosive and anti-hydrogen induced cracking(HIC) performance of steel, but excessive chromium will reduce the extension property of steel plate, promotes growing up of crystal grain and influences toughness, causes the generation of the cold crack of welding region.Therefore, only adopted the relatively add-on of safety among the present invention, steel of the present invention has adopted and has been not more than 0.5% add-on.
Further, the carbon equivalent Ceq of said hot-rolled steel sheet≤0.41, crackle Sensitivity Index Pcm≤0.20.
Preferably, said hot-rolled steel sheet thickness >=14mm, width >=1200mm.
The coal slurry transfer lime comprises the batching, blast-furnace smelting, refining, continuous casting, reheat, controlled rolling and the control cooling working procedure that carry out successively with the preparation method of hot-rolled steel sheet as stated, wherein:
In the reheat operation, slab heating temperature is controlled at 1180-1260 ℃;
In the controlled rolling operation, roughing begins temperature 1000-1100 ℃, and finish rolling begins temperature 860-920 ℃, the overall compression ratio in finish rolling stage >=65%, finishing temperature 750-830 ℃;
In the controlled chilling operation, final cooling temperature 300-450 ℃, return red temperature 450-550 ℃, rate of cooling 15-50 ℃/s.
Particularly preferred, this method also is included in hot straightening operation and the cold bed refrigerating work procedure that carries out successively after the control cooling working procedure.
In fact, the production process route of hot-rolled steel sheet of the present invention also can be summarized as: proportionately divide design scheme proportioning get the raw materials ready → blast-melted → KR molten iron pre-desulfurization → 180t converter smelting → LF refining → RH vacuum-treat → slab continuous casting (being furnished with the continuous casting expert control system) → cold base of slab check → qualified slab goes into rolling and cooling → hot straightening → cold bed cooling → ultrasonic nondestructive test (NDT) → shearing and inspection after construction that stove reheat → regulation and control are organized as purpose.
Compared with prior art, advantage of the present invention is at least:
(1) steel grade has adopted multicomponent alloy composition designs such as low-carbon high-manganese and copper chromium, has good corrosion resistance;
(2) steel grade has lower carbon equivalent Ceq and crackle Sensitivity Index Pcm; Particularly; Carbon equivalent Ceq [=C+Mn/6+ (Cr+Mo+V)/5+ (Cu+Ni)/15] is not more than 0.41; Crackle Sensitivity Index Pcm [=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B] is not more than 0.20, and has added behind the titanium elements in the steel and form TiN and controlled the grain growth of heat affected zone significantly, thereby has good welding property;
(3) the rolling cooling technology that has adopted regulation and control to organize; Realized that surface of steel plate is the high bainite structure of wear resistance; And heart portion is the good acicular ferrite/quasi-polygonal ferrite of strong plasticity and a small amount of pearlitic structure; Thereby guarantee that steel plate not only has high-strong toughness and low yield strength ratio, also have higher wear resisting property.
Description of drawings
Fig. 1 is the synoptic diagram of hot-rolled steel sheet preparation technology light plate of the present invention organizational controls;
Fig. 2 A is the near surperficial metallographic structure photo of hot-rolled steel sheet 1# of the present invention;
Fig. 2 B is the thickness heart portion metallographic structure photo of hot-rolled steel sheet 1# of the present invention;
Fig. 3 A is the near surperficial metallographic structure photo of hot-rolled steel sheet 2# of the present invention;
Fig. 3 B is the thickness heart portion metallographic structure photo of hot-rolled steel sheet 2# of the present invention;
Fig. 4 A is the near surperficial metallographic structure photo of hot-rolled steel sheet 3# of the present invention;
Fig. 4 B is the thickness heart portion metallographic structure photo of hot-rolled steel sheet 3# of the present invention;
Fig. 5 A is the near surperficial metallographic structure photo of hot-rolled steel sheet 4# of the present invention;
Fig. 5 B is the thickness heart portion metallographic structure photo of hot-rolled steel sheet 4# of the present invention;
Fig. 6 A is the Hv10 hardness distribution on the hot-rolled steel sheet 1#-4# thick section of the present invention;
Fig. 6 B is the distribution plan of the TP on the hot-rolled steel sheet 1#-4# thick section of the present invention;
Fig. 7 is hot-rolled steel sheet of the present invention (S65J:1# steel plate) and the corrosion potential comparative graph of Q345B steel in the aqueous solution of pH value=6;
Fig. 8 is hot-rolled steel sheet of the present invention (S65J:1# steel plate) and the corrosion potential comparative graph of Q345B steel in the aqueous solution of pH value=9.
Embodiment
The coal slurry that the present invention is directed to long distance, high transfer pressure, medium above concentration is carried with the wear-resisting technical characterstic that undermines erosion resistance X65 straight-line joint submerged arc welding tube; Develop with the technological X65-X70 coal slurry conveying of the Rolling Production of multicomponent alloy composition designs such as low-carbon high-manganese and copper chromium, high-cleanness, high and zero defect continuously cast bloom STEELMAKING PRODUCTION technology and regulation and control tissue and use hot-rolled steel sheet; The steel plate of producing has high-strong toughness, low yield strength ratio and good weldableness; Its wear resistance and erosion resistance are apparently higher than common X65 steel plate and other same type of material; Say that further its mechanical property is following:
Tensile property: ys 500-600MPa, tensile strength 600-775MPa, elongation after fracture A
50>=34%, yield tensile ratio＜0.9;
Toughness index :-20 ℃ of Charpy-V impact power MV >=260J ,-20 ℃ DWTT shear area average percent (DWTT SA%) >=95%;
Wear resistance: more common oil transportation, gas X65 pipe line steel have improved about 20%;
Antiacid caustic corrosion performance: obviously be superior to other same level steel grade;
The tubulation performance: welding property is good, the high comprehensive performance behind the tubulation.
Generalized saying, the ME of hot-rolled steel sheet of the present invention can comprise following operation: the proportioning by steel plate gets the raw materials ready, blast-melted, KR molten iron pre-desulfurization, 180t converter smelting, LF refining, RH vacuum-treat, slab continuous casting (being furnished with the continuous casting expert control system), slab check, the cold base of qualified slab are gone into the stove reheat, regulation and control are organized as purpose rolling and cooling, hot straightening, cold bed cooling, ultrasonic nondestructive test (NDT), shearing and inspection after construction.
The present invention regulate and control tissue with realize that obdurability is good, the rolling technique thinking of low yield strength ratio and surface abrasion resistance is following: under the reasonable component design premises; Roll postcooling speed through the control steel plate; Have more different to obtain surface of steel plate and heart portion speed of cooling; Thereby realize that surface structure is the bainite structure with strong wear resistance; And steel plate heart portion be strong plasticity better, softer relatively acicular ferrite/quasi-polygonal ferrite and a small amount of pearlitic structure, steel plate organize modulation principle figure as shown in Figure 1.
Below in conjunction with preferred embodiment technical scheme of the present invention is further described.
Consult processing parameter shown in component of hot-rolled steel sheet shown in the table 1 and the table 2 and process hot-rolled steel sheet 1-4, and the mechanical property of the metallographic structure of each steel plate, self mechanical property and the JCOE welded tube processed is tested, see table 3-5 and Fig. 2-8 for details.Wherein, mechanical property test is carried out according to API Spec 5L-2007.
In addition, this case contriver also compares wear resistance and the common X65 steel plate of aforementioned hot rolled steel plate 1-3, and MLG-130 type dry type rubber wheel grain-abrasion testing machine is adopted in wear test, carries out according to JB/T7705-1995.Testload is 130N, and the wearing and tearing number of turns is 800 circles, and rotating speed is 200 commentaries on classics/min, and the flow velocity of silica sand is 300g/min.Carry out quality after the wearing and tearing and weigh, the calculated mass loss, and according to JB/T7705-1995 criterion calculation relative wear resistance.Comparative result is referring to table 6.
Postscript, this case contriver has also carried out hydraulic bursting test to the JCOE welded tube by aforementioned hot rolled steel plate (1# steel plate) steel plate processing, hydrostaticpressure 23.3MPa is adopted in test, after keep-uping pressure 10 minutes, continue to be pressurized to 41MPa after the body explosion lost efficacy.Test basis API Spec 5L-2007 carries out.
Consult Fig. 7 and 8, this case contriver also compares corrosion resistance nature and the Q345B steel plate of steel plate shown in the table 1 (1# steel plate) under two kinds of slant acidity (PH=6) and meta-alkalescence (PH=9) medium.Testing installation is Gamary reference600, and Survey Software is Gamaryframework, and analysis software is Echem Analyst.Test comprises working electrode, supporting electrode (platinum electrode) and reference electrode (standard SCE) for three-electrode system; Test temperature: 20 ℃; Two kinds of aqueous solution of testing liquid: PH=6 and PH=9, the potential measurement time is 20min, scanning speed is 1mv/s.
Table 1 is the chemical ingredients example (wt%) of hot-rolled steel sheet 1#-4# in one embodiment of the present invention
| Sequence number | C | Si | Mn | P | S | Nb | Ti | Cu | Mo | Cr | N | Ceq | |
| 1 | 0.070 | 0.23 | 1.52 | 0.008 | 0.002 | 0.045 | 0.015 | 0.13 | 0.13 | 0.15 | 0.004 | 0.390 | 0.177 |
| 2 | 0.082 | 0.25 | 1.45 | 0.009 | 0.003 | 0.040 | 0.016 | 0.14 | 0.12 | 0.14 | 0.004 | 0.387 | 0.186 |
| 3 | 0.065 | 0.25 | 1.55 | 0.008 | 0.002 | 0.050 | 0.014 | 0.15 | 0.14 | 0.16 | 0.004 | 0.395 | 0.176 |
| 4 | 0.080 | 0.22 | 1.54 | 0.010 | 0.003 | 0.038 | 0.016 | 0.13 | 0.11 | 0.14 | 0.004 | 0.397 | 0.186 |
Table 2 is living rolling technological parameter and metallographic structure analysis of steel plate 1#-4#
Table 3 is tensile properties that steel plate 1#-4# reaches the JCOE welded tube that is processed into by 1# and 2# steel plate
Table 4 is that steel plate 1#-4# reaches the Charpy impact test result of JCOE welded tube under-20 ℃ who is processed into by 1# and 2# steel plate
Table 5 is that steel plate 1#-4# reaches the DWTT result of JCOE welded tube under-20 ℃ who is processed into by 1# and 2# steel plate
Table 6. is that steel plate 1#-3# and common X65 steel plate wear resistance compare
(Δ m, ρ are respectively testing of materials front and back quality change and density).
Claims (5)
1. a coal slurry transfer lime is used hot-rolled steel sheet; It is characterized in that; It comprises the following chemical composition of counting by weight percentage: carbon 0.05～0.10%, silicon 0.20～0.40, manganese 1.20～1.7%, aluminium 0.015～0.06%, niobium 0.03～0.06%, titanium 0.010～0.020%, copper≤0.30%, nickel≤0.30%, chromium≤0.50%, phosphorus≤0.015%, sulphur≤0.005%, nitrogen≤0.006%, vanadium≤0.05%, boron≤0.0005%, and the iron of surplus and impurity.
2. coal slurry transfer lime according to claim 1 is used hot-rolled steel sheet, it is characterized in that the carbon equivalent Ceq of said hot-rolled steel sheet≤0.41, crackle Sensitivity Index Pcm≤0.20.
3. coal slurry transfer lime according to claim 1 is used hot-rolled steel sheet, it is characterized in that, said hot-rolled steel sheet thickness >=14mm, width >=1200mm.
4. the coal slurry transfer lime comprises the batching, blast-furnace smelting, refining, continuous casting, reheat, controlled rolling and the control cooling working procedure that carry out successively with the method for manufacture of hot-rolled steel sheet according to claim 1, it is characterized in that:
In the reheat operation, slab heating temperature is controlled at 1180-1260 ℃;
In the controlled rolling operation, roughing begins temperature 1000-1100 ℃, and finish rolling begins temperature 860-920 ℃, the overall compression ratio in finish rolling stage >=65%, finishing temperature 750-830 ℃;
In the controlled chilling operation, final cooling temperature 300-450 ℃, return 450550 ℃ of red temperature, rate of cooling 15-50 ℃/s.
5. like the method for manufacture of the said coal slurry transfer lime of claim 4, it is characterized in that this method also is included in hot straightening operation and the cold bed refrigerating work procedure that carries out successively after the control cooling working procedure with hot-rolled steel sheet.
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