CN101736207A - Niobium and vanadium-containing economical high-strength and high-weather-resistance hot rolled H-shaped steel and rolling method thereof - Google Patents
Niobium and vanadium-containing economical high-strength and high-weather-resistance hot rolled H-shaped steel and rolling method thereof Download PDFInfo
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Abstract
The invention discloses a niobium and vanadium-containing economical high-strength and high-weather-resistance hot rolled H-shaped steel, which is characterized by comprising the following chemical compositions in percentage by weight: 0.07 to 0.12 percent of C, 0.30 to 0.55 percent of Si, 1.30 to 1.55 percent of Mn, 0.020 to 0.045 percent of P, 0.001 to 0.010 percent of S, 0.25 to 0.35 percent of Cu, 0.20 to 0.30 percent of Cr, 0.15 to 0.30 percent of Ni, 0.04 to 0.08 percent of V, 0.02 to 0.05 percent of Nb, 0.006 to 0.030 percent of Als and the balance of Fe and residual trace impurities. The invention also discloses a rolling method for the H-shaped steel, wherein the soaking temperature of a casting blank is 1,195 to 1,225 DEG C; the start rolling temperature of a breaking down mill is 1,100 to 1,150 DEG C; the finish rolling temperature of the breaking down mill is 980 to 1,030 DEG C; the start rolling temperature of a universal roughing mill is 900 to 950 DEG C; the finish rolling temperature of the universal roughing mill is 800 to 870 DEG C; and a control total rolling reduction rate of a universal rolling area is more than or equal to 50 percent. By the method, the hot rolled H-shaped steel with high strength, high toughness, high weather resistance and good welding performance can be prepared. At the same time, because the steel has simple metallurgic components, relatively low alloying production cost, economy and practicability, the hot rolled H-shaped steel is the ideal hot rolled H-shaped steel used for manufacturing railway vehicles, freight semi-trailers and other industrial facilities needing the high-strength and high-weather-resistance steel.
Description
Technical field
The present invention relates to the low alloy steel field, relate in particular to a kind of economical high-strength and high-weather-resistance hot rolled H-shaped with steel and rolling method thereof.
Background technology
High-strength weathering steel is meant the weathering steel of yield strength 〉=450MPa, this class steel mainly is used in the manufacturing of special container, bridge and high-speed train railway carriage, is all playing an important role aspect loss of weight, speed-raising, increase volume of freight traffic, prolongation service life of equipment and the reduction logistics cost.Particularly along with fast development of national economy, the transportation by railroad industry strides forward to passenger traffic high speed, shipping heavy loading direction, presses for the hot rolled H-shaped of high strength, high tenacity, high-weatherability.Because high weather resistance steel is in demanding weathering resistance, also demanding intensity rank, good low-temperature impact toughness and welding property are therefore very high to metallurgical technology process and the requirement of device control level.
Trade mark S355WP is hot-rolled sheet or shaped steel in the ISO of International Standards Organization 4952 standards, the mass percent of chemical ingredients (wt%) is: C≤0.12, Si:0.20～0.75, Mn≤1.00, P:0.06～0.15, S≤0.035, Cr:0.30～1.25, Cu:0.25～0.55, Ni≤0.65 can add microalloy elements such as Nb, V, Ti, Al; Require yield strength 〉=355MPa, tensile strength 〉=470～630MPa, wherein D level steel-20 a ℃ vertical v-notch ballistic work requires more than or equal to 27J.Trade mark S390WP is hot-rolled sheet or shaped steel in ISO 4952 standards, the mass percent of chemical ingredients (wt%) is: C≤0.12, Si:0.15～0.65, Mn≤1.40, P:0.07～0.12, S≤0.035, Cr:0.30～1.25, Cu:0.25～0.55, Ni≤0.65 can add microalloy elements such as Nb, V, Ti, Al; Require yield strength 〉=390MPa, tensile strength 〉=490～650MPa, wherein D level steel-20 a ℃ vertical v-notch ballistic work requires more than or equal to 27J.Trade mark S460W is hot-rolled sheet or shaped steel in ISO 4952 standards, the mass percent of chemical ingredients (wt%) is: C≤0.20, Si:0.15～0.65, Mn≤1.40, P≤0.04, S≤0.035, Cr:0.40～0.80, Cu:0.25～0.55, Ni≤0.65 can add microalloy elements such as Nb, V, Ti, Al; Require yield strength 〉=460MPa, tensile strength 〉=570～730MPa, wherein D level steel-20 a ℃ vertical v-notch ballistic work requires more than or equal to 27J.But based on the hot rolled H-shaped report that yet there are no of high-strength weathering more than the hot rolled H-shaped rolling explained hereafter yield strength 450MPa.
China has developed a collection of grade of steel from the extensive development weathering steel sixties in 20th century, and Cu-P series, Cu-P-Re series, Cu-P-Cr-Ni series are wherein arranged.Domestic atmospheric corrosion resistance has Q235NH, Q295NH, Q355NH, Q460NH and Q295GNH, Q295GNHL, Q345GNH, 9 trades mark such as Q345GNHL, Q390GNH in GB/T4172 " welded construction weathering steel " and two standards of GB/T4171 " high weather-proof structure iron " with steel, and quality grade has C level, D level and E level respectively.Wherein welded construction is up to 460MPa with weathering steel yield strength rank, and high weather-proof structure iron yield strength rank is up to 390MPa.Welded construction is up to the E level with the weathering steel quality grade, and stipulate-40 ℃ of vertical v-notch ballistic works: Q235NH～Q355NH is not less than 27J, and Q460NH is not less than 31J.And high weather-proof structure iron does not segment quality grade, the v-notch shock test is an option, just does check when having only customer requirements, and the temperature of shock test has 0 ℃ and-20 ℃ two kinds, concrete test temperature is arranged in contract, and the mean value of ballistic work requires to be not less than 27J.
In recent years, domestic Anshan iron and steel plant, Baosteel, Wuhan Iron and Steel Plant and climb steel etc. and developed 400MPa～550MPa grade high-strength atmospheric corrosion resistance steel plate and 310 second font steel, and be used widely on the rail vehicle at home.But the intensity rank of the atmospheric corrosion resistance H shaped steel that the flatcar crossbeam adopts still maintains the 345MPa level, and its steel grade has 09CuPTiRE and 09CuPCrNi, and the index of main atmospheric corrosion resistance is: compare with common Q 235B steel, relatively erosion rate≤65%.With common buildings with steel different be, the north and south four seasons temperature difference is big during the China railways vehicle operating, shock load is big during operation, therefore making automotive steel has proposed higher requirement to low-temperature flexibility, 09CuPTiRE and 09CuPCrNi as a large amount of uses at present require-40 ℃ of v-notch ballistic work 〉=21J, and the sulfide-based and rank alumina type inclusion is not more than 2.5 grades and 2 grades respectively.
In sum, the research and development of high-strength weathering steel are produced in the Production Flow Chart such as sheet material at home and abroad, be mature on the whole to the controlling of production process technology from the kind of composition design, Development and Production goes out the high-strength weathering steel of heterogeneity series, and intensity rank reaches more than the 450MPa.But yet there are no report at home and abroad, particularly economical high-strength weathering steel based on hot rolled H-shaped rolling process using V, the hot rolled H-shaped composition design and processes of high-strength weathering more than the Nb micro-alloying technology production yield strength 450MPa.Because H section rolling distortion is very inhomogeneous, be very easy to occur mixed crystal when rolling V, Nb microalloying weathering steel, thereby cause low-temperature impact toughness on the low side, therefore need on metallurgically design and technology controlling and process, take new design and processes route; Simultaneously, need by metallurgically optimization design and process optimization control, it is weather-resistance hot rolled H-shaped to produce the economical high-intensity high-tenacity height that is suitable for hot rolled H-shaped rolling technology at lower cost, to meet the need of market.
Summary of the invention
Technical problem to be solved by this invention provides a kind of niobium+vanadium composite micro-alloying technology production yield strength 450MPa above high weather-resistance hot rolled H-shaped steel of economical high-intensity high-tenacity and rolling method thereof of adopting.
Technical scheme of the present invention is: on the basis that guarantees certain P content, suitably reduce C, Cr, Ni content, improve Si, Mn content, add an amount of aluminium, vanadium and niobium, it is weather-resistance hot rolled H-shaped to obtain economical high-intensity high-tenacity height by controlled rolling technology.
A kind of niobium and vanadium-containing economical high-strength and high-weather-resistance hot rolled H shaped steel steel of the present invention, the mass percent of chemical ingredients (wt%) is: C:0.07～0.12, Si:0.30～0.55, Mn:1.30～1.55, P:0.020～0.045:S:0.001～0.010, Cu:0.25～0.35, Cr:0.20～0.30, Ni:0.15～0.30, V:0.04～0.08:Nb:0.02～0.05; Als:0.006～0.030, all the other are iron and remaining trace impurity.
A kind of niobium and vanadium-containing economical high-strength and high-weather-resistance hot rolled H shaped steel of the present invention with the rolling technology of steel is: the strand walking beam furnace heats, " bloomer BD-three frame universal rolling mill groups (are universal roughing mill U
R1+ edger E+ universal roughing mill U
R2)-omnipotent finishing mill U
f" tandem reversible rolling, hot saw, cooling, aligning, stacking.Processing parameter is: 1195～1225 ℃ of strand soaking temperatures; 1100～1150 ℃ of bloomer start rolling temperatures; 980～1030 ℃ of bloomer finishing temperatures; 900～950 ℃ of universal roughing mill start rolling temperatures; 800～870 ℃ of omnipotent finishing mill finishing temperatures; The universal rolling district controls total draft 〉=50%.
The present invention designs by rational chemical, processing parameter when adding control H section rolling, utilize nano-scale precipitates such as aluminium nitride, carbon vanadium nitride, carbon niobium nitride to the refining effect of crystal grain and the principle of precipitation strength, can obtain the hot rolled H-shaped of high strength, high tenacity, high-weatherability and good welding property.Simultaneously, because the metallurgically of steel is simpler, the alloying production cost is lower, and is economical and practical, is to be used to make desirable hot rolled H-shaped that rail truck, shipping semitrailer and other need that the industrial plants of high-strength weathering steel build.
Embodiment
A kind of niobium and vanadium-containing economical high-strength and high-weather-resistance hot rolled H shaped steel steel of the present invention, the mass percent of chemical ingredients (wt%) is: C:0.07～0.12, Si:0.30～0.55, Mn:1.30～1.55, P:0.020～0.045:S:0.001～0.010, Cu:0.25～0.35, Cr:0.20～0.30, Ni:0.15～0.30, V:0.04～0.08:Nb:0.02～0.05; Als:0.006～0.030, all the other are iron and remaining trace impurity.
From the mass percent of above chemical ingredients as can be seen, the composition of steel of the present invention suitably reduces Cr, Ni content on the basis that guarantees certain P content; Adding by aluminium, vanadium and niobium simultaneously improves its weathering resistance.Both guarantee economy, guaranteed weathering resistance again.In addition,, suitably improve Si, Mn content, add an amount of aluminium, vanadium and niobium simultaneously, to guarantee its intensity, low-temperature flexibility and welding property suitably reducing on the basis of C content.
In order to guarantee that further this kind steel has good welding property, on the basis of above chemical ingredients scope, increased the control of Ceq, Ceq=C+Mn/6+ (Cr+V+Mo)/5+ (Cu+Ni)/15, the scope of Ceq≤0.47%, C wherein, Mn, Cr, V, Mo, Cu, Ni are meant the mass percent of seven kinds of elements.
A kind of niobium and vanadium-containing economical high-strength and high-weather-resistance hot rolled H shaped steel of the present invention with the rolling technology of steel is: the strand walking beam furnace heats, " bloomer BD-three frame universal rolling mill groups (are universal roughing mill U
R1+ edger E+ universal roughing mill U
R2)-omnipotent finishing mill U
f" tandem reversible rolling, hot saw, cooling, aligning, stacking.
Utilize H type steel production line milling train to be that " bloomer BD-three frame universal rolling mill groups (are universal roughing mill U
R1+ edger E+ universal roughing mill U
R2)-omnipotent finishing mill U
f" three row layout features, the rolling technology that V+Nb microalloying steel grade is adopted is:
According to guaranteeing the not serious alligatoring of this steel original austenite grains and guaranteeing niobium and the carbonitride of vanadium dissolves fully, guarantees simultaneously that Copper Bearing Steel does not produce the principle of check surface, determined suitable heating cycle; BD cogging district adopts the recrystallization zone controlled rolling, and control cogging district finishing temperature makes austenite crystal not a mixed crystal and a refinement; The universal rolling district controls total draft (〉=50%) and finishing temperature, make to produce enough deformation bands uniformly in the austenite crystal, ferrite is forming core on intracrystalline and deformation bands, makes the refinement of crystal grain secondary, and the carbonitride disperse of niobium and vanadium is separated out, reach the purpose of strengthening the malleableize of holding concurrently.
H section rolling processing parameter is: 1195～1225 ℃ of strand soaking temperatures; 1100～1150 ℃ of bloomer start rolling temperatures; 980～1030 ℃ of bloomer finishing temperatures; 900～950 ℃ of universal roughing mill start rolling temperatures; 800～870 ℃ of omnipotent finishing mill finishing temperatures; The universal rolling district controls total draft 〉=50%.
Following embodiment is used to set forth the present invention, but protection scope of the present invention is not limited in following examples.
The embodiment of composition, main production parameter and performance that the present invention is hot rolled H-shaped is as follows:
Embodiment 1:
The mass percent of molten steel chemical ingredients (wt%) is: C:0.07; Si:0.39; Mn:1.51:P:0.024; S:0.002; Cu:0.25; Cr:0.26; Ni:0.26; V:0.07; Nb:0.04:Als:0.015.
H section rolling processing parameter is: 1220 ℃ of strand soaking temperatures; 1120 ℃ of bloomer start rolling temperatures; 1000 ℃ of bloomer finishing temperatures; 940 ℃ of universal roughing mill start rolling temperatures; 845 ℃ of omnipotent finishing mill finishing temperatures; The universal rolling district controls total draft 〉=50%.
(specification is that 600mm * 200mm * 11mm * 17mm) performance index are to H shaped steel: R
ELBe 495MPa, R
mBe 605MPa, A is 26% ,-40 ℃ of vertical A
KVBe 285J, prior austenite grain size is 10.0 grades, and corrosion rate is 52.3% of a Q345B steel relatively.
Embodiment 2:
The mass percent of molten steel chemical ingredients (wt%) is: C:0.09; Si:0.48; Mn:1.43; P:0.038; S:0.003; Cu:0.28; Cr:0.27; Ni:0.21; V:0.05; Nb:0.05:Als:0.026.
H section rolling processing parameter is: 1225 ℃ of strand soaking temperatures; 1125 ℃ of bloomer start rolling temperatures; 1010 ℃ of bloomer finishing temperatures; 940 ℃ of universal roughing mill start rolling temperatures; 855 ℃ of omnipotent finishing mill finishing temperatures; The universal rolling district controls total draft 〉=50%.
(specification is that 600mm * 200mm * 11mm * 17mm) performance index are to H shaped steel: R
ELBe 490MPa, R
mBe 595MPa, A is 27% ,-40 ℃ of vertical A
KVBe 225J, prior austenite grain size is 9.5 grades, and corrosion rate is 54.3% of a Q345B steel relatively.
Embodiment 3:
The mass percent of molten steel chemical ingredients (wt%) is: C:0.11; Si:0.44; Mn:1.39; P:0.029; S:0.008; Cu:0.33; Cr:0.24; Ni:0.25; V:0.08; Nb:0.03; Als:0.008.
H section rolling processing parameter is: 1195 ℃ of strand soaking temperatures; 1105 ℃ of bloomer start rolling temperatures; 980 ℃ of bloomer finishing temperatures; 915 ℃ of universal roughing mill start rolling temperatures; 815 ℃ of omnipotent finishing mill finishing temperatures; The universal rolling district controls total draft 〉=50%.
(specification is that 630mm * 200mm * 13mm * 20mm) performance index are to H shaped steel: R
ELBe 475MPa, R
mBe 575MPa, A is 29% ,-40 ℃ of vertical A
KVBe 214J, prior austenite grain size is 10.0 grades, and corrosion rate is 53.8% of a Q345B steel relatively.
Embodiment 4:
The mass percent of molten steel chemical ingredients (wt%) is: C:0.12; Si:0.45; Mn:1.38; P:0.044; S:0.005; Cu:0.30; Cr:0.30; Ni:0.18; V:0.08; Nb:0.03; Als:0.010.
H section rolling processing parameter is: 1220 ℃ of strand soaking temperatures; 1130 ℃ of bloomer start rolling temperatures; 1015 ℃ of bloomer finishing temperatures; 925 ℃ of universal roughing mill start rolling temperatures; 865 ℃ of omnipotent finishing mill finishing temperatures; The universal rolling district controls total draft 〉=50%.
(specification is that 630mm * 200mm * 13mm * 20mm) performance index are to H shaped steel: R
ELBe 485MPa, R
mBe 585MPa, A is 28% ,-40 ℃ of vertical A
KVBe 255J, prior austenite grain size is 9.0 grades, and corrosion rate is 54.8% of a Q345B steel relatively.
Under the situation of rolling technology control stabilization, adopt steel grades of the present invention and method can obtain ferrite grain size at the fine grained steel more than 8 grades, hot rolled H-shaped performance index are: yield strength R
EL〉=450MPa, tensile strength R
m〉=550MPa, elongation after fracture A 〉=21% ,-40 ℃ of vertical A
KV〉=80J, corrosion rate≤55% (the contrast steel grade is the Q345B steel) relatively.H shaped steel edge of a wing thickness range is 10～30mm.
Adopt hot rolled H-shaped that the present invention produces, because intensity is higher, low-temperature flexibility and welding property is good, weathering resistance is high, so can save steel, reduce laid down cost, increase the security of building, environmental protection simultaneously.
Claims (3)
1. niobium and vanadium-containing economical high-strength and high-weather-resistance hot rolled H shaped steel steel, it is characterized in that: the mass percent of chemical ingredients (wt%) is: C:0.07～0.12, Si:0.30～0.55, Mn:1.30～1.55, P:0.020～0.045; S:0.001～0.010, Cu:0.25～0.35, Cr:0.20～0.30, Ni:0.15～0.30, V:0.04～0.08; Nb:0.02～0.05; Als:0.006～0.030, all the other are iron and remaining trace impurity.
2. a kind of niobium and vanadium-containing economical high-strength and high-weather-resistance hot rolled H shaped steel steel according to claim 1, it is characterized in that: the scope of carbon equivalent Ceq is≤0.47%, carbon equivalent Ceq=C+Mn/6+ (Cr+V+Mo)/5+ (Cu+Ni)/15, C wherein, Mn, Cr, V, Mo, Cu, Ni are meant the mass percent of seven kinds of elements.
3. claim 1,2 described a kind of niobium and vanadium-containing economical high-strength and high-weather-resistance hot rolled H shaped steel with the rolling technology of steel are: the heating of strand walking beam furnace, " bloomer BD-three frame universal rolling mill group U
R1EU
R2-omnipotent finishing mill U
f" tandem reversible rolling, tandem reversible rolling, hot saw, cooling, aligning, stacking, it is characterized in that: 1195～1225 ℃ of strand soaking temperatures; 1100～1150 ℃ of bloomer start rolling temperatures; 980～1030 ℃ of bloomer finishing temperatures; 900～950 ℃ of universal roughing mill start rolling temperatures; 800～870 ℃ of omnipotent finishing mill finishing temperatures; The universal rolling district controls total draft 〉=50%.
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