CN102409253A - Weathering resistant steel for high-corrosion-resistance high-strength railway vehicle and manufacturing method of weathering resistant steel - Google Patents
Weathering resistant steel for high-corrosion-resistance high-strength railway vehicle and manufacturing method of weathering resistant steel Download PDFInfo
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Abstract
The invention discloses weathering resistant steel for a high-corrosion-resistance high-strength railway vehicle and a manufacturing method of the weathering resistant steel. The weathering resistant steel comprises the following chemical components by weight percentage: 0.015%-0.065% of C, 0.10%-0.50% of Si, 0.20%-0.60% of Mn, less than 0.015% of P, less than 0.008% of S, 0.01%-0.08% of Ti, 0.005%-0.05% of Nb, 2.15%-4.0% of Cr, 0.12%-1.0% of Ni, 0.20%-0.60% of Cu, 0.01%-0.05% of Al, and the rest Fe and inevitable impurities. According to the invention, when a convertor is used for controlling, the chromium content is 1.5%, the continuous casting blank heating temperature is 1,200-1,260 DEG C, the initial rolling temperature of the rough rolling is over 1,100 DEG C, the initial rolling temperature of the finish rolling is 1,100-980 DEG C, the final rolling temperature is 950-880 DEG C, and the coiling temperature is 560-660 DEG C. The steel disclosed by the invention has the bending strength being more than or equal to 550 MPa, tensile strength being more than or equal to 650 MPa, high atmospheric corrosion resistance property, excellent strong toughness matching property, good low-temperature impact toughness and good welding property.
Description
Technical field
The invention belongs to metallurgical technology field, relate to the production of weathering steel, specifically is that a kind of high-corrosion-resisting, high strength rail truck is with weathering steel and method of manufacture thereof.
Background technology
Along with the fast development of China Railway, railway freight-car is heavily loaded, speed-raising is extremely urgent.Alleviating light weight, raising supporting capacity and work-ing life is the main means that realize transportation by railroad speed-raising and heavy duty.The reduction of light weight can make the vehicle lightweight, increases weight-carrying capacity.One of effective measure that alleviate light weight are exactly to adopt high-strength weathering steel.What generally adopt now is the 450MPa grade high-strength weathering steel, can not satisfy the requirements at the higher level of rail vehicle to intensity.
Railway freight-car constantly receives atmospheric environment corrosion and moving load wearing and tearing in operational process, abominable applied environment forces the steel that adopted must have the highly corrosion resistant performance.Railway had once carried out complete investigation to the rail vehicle corrosion situation of existing weathering steel made, and the result shows that the corrosion resisting property of existing common high-strength weathering steel can not satisfy the rail vehicle technical need of 25 years design periods.Adopt stainless steel to replace weathering steel to make rail truck, cost is high, also has a series of problems such as welding, processing to need to solve simultaneously.The solidity to corrosion of aluminum alloy materials under atmospheric environment is good, but intensity is lower, usually adopts riveted joint rather than welding, and the central sill equivalent-load parts of vehicle still adopt ferrous materials with the riveted joint material, has serious galvanic corrosion problem at the riveted joint position.For improving the rail truck design service life, prolong the repair in shop cycle, therefore need a kind of, solidity to corrosion better high intensity high corrosion resistance weathering steel higher of exploitation than existing high weather resistance steel intensity.
The patent of patent No. US6066833; Introduced a kind of high strength low yield ratio weathering resistant steel and working method (Thermomechanically controlled processed high strength weathering steel with low yield/tensile ratio) thereof that adopts controlled rolling and controlled cooling method to produce; This steel ys is about 483-518MPa, and yield tensile ratio is less than 0.85.This patent has adopted the design of Nb-Ti-Mo microalloy composition, has added the V element of 0.06%-0.14% especially.Add V and not only increase manufacturing cost, and can worsen the welding property and the low-temperature impact toughness of steel plate, the ys rank only reaches 483-518MPa, and intensity rank is low.
The patent of patent No. ZL200810197846.3; Introduced a kind of ys greater than 550MPa grade ultra-low-carbon hot rolling weather-resisting steel; Have good low-temperature impact toughness, weldableness and resistance to atmospheric corrosion, but added Alloy Elements Mo (≤0.4%), cost is improved greatly; Added alloying element Ca again,,, ladle nozzle dross phenomenon can take place, worsened the casting properties of steel if deal with improperly though can control the form of inclusion through the Ca processing.
The patent of patent No. ZL200810304030.6; A kind of high-strength atmospheric corrosion resistant hot-rolled strip steel and working method thereof have been introduced; Have over-all propertieies such as HS, H.T., high-ductility, low yield strength ratio, the ys rank of this steel is the 450MPa level, and intensity rank is low.
Patent No. ZL200910301054.0 patent; A kind of high-strength weather resisting steel and working method thereof have been introduced; This patent of invention has been added V element (0.09%-0.15%) especially, adds V element and has not only increased manufacturing cost, and be unfavorable for the welding property and the low-temperature impact toughness of steel plate.
Patent No. ZL200510111858.6 patent; A kind of air corrosion resisting high strength low alloy metal and working method thereof have been introduced; Added two or more of Nb (≤0.07%), Ti (≤0.025%) and Mo (≤0.35%) in this patent of invention, Nb and Mo large usage quantity, cost is high.Added simultaneously alloying element Ca again,,, ladle nozzle dross phenomenon can take place, worsened the casting properties of steel if deal with improperly though can control the form of inclusion through the Ca processing.
Patent No. ZL200710045329.X patent has been introduced a kind of high-corrosion resistant high-strength weather resisting steel and method of manufacture thereof, and this steel is through adding alloying element such as Cu, Cr, Ni and adopting cooling controlling and rolling controlling process to obtain higher intensity and excellent corrosion resistant performance.This patent of invention has been added the Cr element of 4.50-5.50%; High Cr content requirement like this; Can cause adding a large amount of ferrochrome in the steelmaking process, too high Cr content can increase the steel-making difficulty, and is not easy to operate; And the welding property of Cr too high levels meeting severe exacerbation steel, this patent does not provide the assurance to low-temperature impact toughness.
Patent No. ZL200610125365.2 patent has been introduced a kind of high-strength weathering steel and working method thereof, and this steel has the low-temperature impact toughness of HS, excellence, but unit elongation is on the low side.And added Alloy Elements Mo (0.10%-0.40%) again, increased cost; What adopt is quenching+tempering hardening and tempering process, has prolonged the production cycle.
Make a general survey of the technology that above-mentioned patent discloses, all have certain deficiency, can not satisfy the service demand of China railways vehicle fully.
Summary of the invention
Corrosion resisting property to existing weathering steel can not satisfy rail vehicle technical need and, the demand for raising speed heavily loaded to rail vehicle of 25 years design periods; A kind of high-corrosion-resisting, high strength rail truck is disclosed with weathering steel and method of manufacture thereof; Its corrosion resisting property improves more than 1.0 times than existing traditional high-strength weathering steel; The ys rank is 550MPa, and elongation after fracture has good low-temperature impact toughness and good welding property more than 20%.
Its chemical ingredients of the present invention by mass percentage; Comprise: below C:0.015%～0.065%, Si:0.10%～0.50%, Mn:0.20%-0.60%, P:0.015%, below the S:0.008%, Ti:0.01%～0.08%, Nb:0.005%～0.05%, Cr:2.15%～4.0%, Ni:0.12%～1.0%; Cu:0.20%～0.60%, Al:0.01%～0.05%, surplus are Fe and unavoidable impurities.
The reasons are as follows of chemical ingredients that the present invention adopts:
C: be to improve the most economical effective alloying element of intensity, but the C too high levels can worsen the welding property of steel and the atmospheric corrosion resistance of reduction steel, what the present invention adopted is the Ultra-low carbon design, improves the welding property of steel; Can obtain even single tissue, improve the atmospheric corrosion resistance of steel.C content of the present invention is 0.015%～0.065%.
Si: through the intensity of solution strengthening raising steel, also improve the atmospheric corrosion resistance of steel simultaneously, but too high levels can make welding property descend, and its content is controlled at 0.10%～0.50% for this reason.
Mn: have higher solution strengthening effect, can significantly reduce the transformation temperature of steel, the microstructure of refinement steel; Be important obdurability element, but the Mn too high levels can make the hardening capacity of steel heighten; Worsen the welding property of steel, its content is controlled at 0.20%-0.60% for this reason.
P: be the principal element in traditional weathering steel, if but its too high levels can reduce the welding property and the low-temperature impact toughness of steel, adopt extremely low P content, its span of control P≤0.015% among the present invention.
S: be the harmful element in the steel, the sulfide inclusion of generation has a strong impact on the mechanical property of steel, reduces its content among the present invention for this reason as far as possible, and it is controlled at below 0.008%.
Ti: be strong carbonitride forming element, in slab reheat process, stop austenite crystal to be grown up, help rolling the back and obtain evenly tiny tissue, improve the intensity and the low-temperature flexibility of steel.In the steel plate welding process, TiC in the steel and TiN can significantly stop the heat affected zone grain growth in addition, thereby strong in the raising of steel plate welding property.Ti is controlled at 0.01%～0.08% among the present invention.
Nb: be strong carbonitride forming element, improve the intensity of steel through precipitation strength.The strongly inhibited austenite recrystallization makes steel rolling under comparatively high temps on the other hand, crystal grain thinning, the intensity and the low-temperature flexibility of raising steel.Nb is controlled at 0.005%～0.05% among the present invention.
Cu: be to improve the main alloying element of steel corrosion resisting property, improve the intensity of steel simultaneously through solution strengthening, precipitation strength.If but too high levels can cause the hot-short of steel.Control its content among the present invention 0.20%～0.60% for this reason.
Ni: be the alloying element that significantly improves the steel corrosion resisting property, can effectively stop simultaneously because the hot-short check crack that causes of Cu.But it costs an arm and a leg, and should control it and add content.Its content of control is 0.12%～1.00% among the present invention.
Cr: can make the steel surface form fine and close passive film, significantly improve the passivation ability of steel, thereby improve the atmospheric corrosion resistance of steel.Cr content is being controlled at 2.15%-4.0%, can make the atmospheric corrosion resistance of steel improve more than 1.0 times than traditional weathering steel.
Al: be the main deoxidant element in the steel, adding suitable Al can crystal grain thinning, improves the performance of steel.But its content surpasses at 0.05% o'clock, can increase the oxide inclusion in the steel, reduces the toughness and the solidity to corrosion of steel.Its content of control is 0.01%～0.05% among the present invention.
Technical process of the present invention is: converter smelting-continuous casting-hot charging-hot continuous rolling-laminar flow cools off-batches.Its characteristics are,
(1) converter operation: at converter control C content to 150～300PPm, O content to 200～350PPm, and then add ferrochrome, make chromium content reach 1.5%, remaining chromium content is supplied in concise operation;
(2) continuously cast bloom can carry out hot charging or slow cooling.Like hot charging, the strand temperature needs greater than 600 ℃; As want slow cooling, and continuously cast bloom directly advances burial pit, and the burial pit temperature needs greater than 550 ℃, and slow cooling is more than 16 hours.
(3) hot continuous rolling at first heats steel billet, and fully austenitizing makes the abundant solid solution of microalloy element, and Heating temperature is 1200～1260 ℃.Then be rolled.
(4) rolling
Two stages of rolling branch carry out, i.e. rough rolling step and finish rolling stage.
Rough rolling step: start rolling temperature is set in more than 1100 ℃, and the plasticity of steel is good, and intensity is low, is easy to rolling.
The finish rolling stage: start rolling temperature is set in 1100～980 ℃, and finishing temperature is set in 950～880 ℃.The finish rolling start rolling temperature is higher than 1100 ℃, and finished product crystal grain is difficult for refinement, and the refined crystalline strengthening effect is bad.Be lower than 980 ℃, then increase the load of finishing stand, cause accident easily; The regulation finishing temperature can avoid in the two-phase region the rolling mill load that makes excessive more than 880 ℃, and it is interval to avoid the restive texturing temperature of template, and can reduce steel plate in length and breadth to performance difference.But finishing temperature is higher than 950 ℃, and grain refining is not enough, influences strengthening effect
(5) cooling
Carry out the laminar flow cooling after the rolling end, batch.Coiling temperature is set in 560～660 ℃, is higher than 660 ℃, is difficult to obtain fine grained texture after batching, and strengthening effect is not enough.Be lower than 560 ℃, the one, excessive bainite transformation can appear, and unit elongation descends, and influences processability, and the 2nd, batching the back internal stress increases the bad control of plate shape.
Steel according to the invention possesses following advantage:
1, steel ys >=550MPa of the present invention, tensile strength >=650MPa, elongation after fracture >=20%, (specimen size 10mm * 10mm * 55mm), the raising of intensity can alleviate light weight, improve supporting capacity-40 ℃ of v-notch Charpy-V impact power >=60J.
2, steel atmospheric corrosion resistance of the present invention improves more than 1.0 times with respect to the traditional high-strength weathering steel that is using at present, can improve the operation life of railway freight-car under severe environment, reduces the vehicle maintenance cost significantly.
3, composition of steel simplicity of design of the present invention adopts the Ultra-low carbon design to make and organizes simplification, improves the low-temperature impact toughness and the solidity to corrosion of steel, improves the welding property of steel.Add simultaneously an amount of microalloy element Nb, Ti in the steel, reach the effect of crystal grain thinning, make the invention steel have splendid obdurability coupling, good low-temperature impact toughness and good welding property through controlled rolling and controlled cooling.
Embodiment
The present invention will be described through embodiment below.
The present invention provides a kind of high-corrosion resistant high-strength weather resisting steel; Its composition by mass percentage; Comprise: below C:0.015%～0.065%, Si:0.10%～0.50%, Mn:0.20%-0.60%, P:0.015%, below the S:0.008%, Ti:0.01%～0.08%, Nb:0.005%～0.05%, Cr:2.15%～4.0%, Ni:0.12%～1.0%; Cu:0.20%～0.60%, Al:0.01%～0.05%, surplus are Fe and unavoidable impurities.
The present invention is that a kind of high-corrosion-resisting, high strength rail vehicle is used weathering steel, and technical process is: converter smelting-continuous casting-hot charging-hot continuous rolling-laminar flow cools off-batches.
(1) converter operation: control C content 150～300PPm earlier in converter, during O content 200～350PPm, add ferrochrome again, make chromium content reach 1.5%, remaining chromium content is supplied in concise operation.
(2) continuously cast bloom can carry out hot charging or slow cooling.Like hot charging, the strand temperature needs greater than 500 ℃; As can not hot charging, when needing slow cooling, continuously cast bloom directly advances burial pit, and the burial pit temperature needs greater than 550 ℃, and slow cooling is more than 16 hours.
(3) hot continuous rolling at first heats steel billet, and fully austenitizing makes the abundant solid solution of microalloy element, and Heating temperature is 1200～1260 ℃.Then be rolled.
(4) two stages of rolling branch carry out, i.e. rough rolling step and finish rolling stage.
Rough rolling step: start rolling temperature is set in more than 1100 ℃, and the plasticity of steel is good, and intensity is low, is easy to rolling.
The finish rolling stage: start rolling temperature is set in 1100～980 ℃, and finishing temperature is set in 950～880 ℃.The finish rolling start rolling temperature is higher than 1100 ℃, and finished product crystal grain is difficult for refinement, and the refined crystalline strengthening effect is bad.Be lower than 980 ℃, then increase the load of finishing stand, cause accident easily; The regulation finishing temperature can avoid in the two-phase region the rolling mill load that makes excessive more than 880 ℃, and it is interval to avoid the restive texturing temperature of template, and can reduce steel plate in length and breadth to performance difference.But finishing temperature is higher than 950 ℃, and grain refining is not enough, influences strengthening effect.
(5) carrying out laminar flow after the rolling end cools off, batches.Earlier be cooled to 690～720 ℃ with the laminar flow leading portion, air cooling 10s～15s is cooled to coiling temperature with the laminar flow back segment more then, and coiling temperature is set in 560～660 ℃, is higher than 660 ℃, is difficult to obtain fine grained texture after batching, and strengthening effect is not enough.Be lower than 560 ℃, the one, excessive bainite transformation can appear, and unit elongation descends, and influences processability, and the 2nd, batching the back internal stress increases the bad control of plate shape.
One group of most preferred embodiment chemical ingredients of table 1 steel of the present invention
The hot continuous rolling process parameter of table 2 steel of the present invention
The Mechanics Performance Testing result of table 3 steel of the present invention
Soak into corrosion test method TB/T2375-93 by railway with the weathering steel cycle and carry out 72 hours periods infiltration corrosion test, straight carbon steel Q345B and high-strength weathering steel Q450NQR1 are comparative sample, and test result is seen table 4.
The real steel atmospheric corrosion resistance of table 4 the present invention test result
Claims (4)
1. a high-corrosion-resisting, high strength rail truck is used weathering steel; It is characterized in that; Chemical ingredients by mass percentage; Comprise: below C:0.015%～0.065%, Si:0.10%～0.50%, Mn:0.20%-0.60%, P:0.015%, below the S:0.008%, Ti:0.01%～0.08%, Nb:0.005%～0.05%, Cr:2.15%～4.0%, Ni:0.12%～1.0%; Cu:0.20%～0.60%, Al:0.01%～0.05%, surplus are Fe and unavoidable impurities.
2. an a kind of high-corrosion-resisting, high strength rail truck as claimed in claim 1 is with the method for manufacture of weathering steel, and technical process is: converter smelting-continuous casting-hot charging-hot continuous rolling-laminar flow cools off-batches, and it is characterized in that:
1) converter operation: at converter control C content to 150～300PPm, O content to 200～350PPm, and then add ferrochrome, make chromium content reach 1.5%, remaining chromium content is supplied in concise operation;
2) continuously cast bloom carries out hot charging;
3) hot continuous rolling at first heats steel billet, and fully austenitizing makes the abundant solid solution of microalloy element, and Heating temperature is 1200～1260 ℃;
4) rolling, two stages of rolling branch carry out, i.e. rough rolling step and finish rolling stage;
Rough rolling step: start rolling temperature is set in 1100 ℃～1250 ℃;
The finish rolling stage: start rolling temperature is set in 1120～980 ℃, and finishing temperature is set in 950～880 ℃;
5) carry out the laminar flow cooling after the rolling end, be cooled to 690～720 ℃ with the laminar flow leading portion earlier, air cooling 10s～15s is cooled to coiling temperature with the laminar flow back segment more then, and coiling temperature is 560～660 ℃.
3. a kind of high-corrosion-resisting, high strength rail truck according to claim 2 is characterized in that with the method for manufacture of weathering steel continuously cast bloom adopts hot charging to be rolled, and continuously cast bloom hot charging temperature must not be lower than 500 ℃.
4. a kind of high-corrosion-resisting, high strength rail truck according to claim 2 is characterized in that with the method for manufacture of weathering steel, when steel plate thickness≤8mm, adopts two sections laminar flows coolings or directly is cooled to 640～660 ℃ continuously, batches then.
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Application publication date: 20120411 |