CN103225044B - Steel for vanadium micro alloying low temperature steel bar and process for rolling steel - Google Patents
Steel for vanadium micro alloying low temperature steel bar and process for rolling steel Download PDFInfo
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Abstract
The invention discloses a steel for vanadium micro alloying low temperature steel bar and process for rolling the steel. The steel for low temperature steel bar comprises the chemical components by weight percent: C: 0.05-0.15%, Si: 0.15-0.40%, Mn: 1.40-1.60%, P<=0.010%, S<=0.010%, Ni: 0.50-2.00%, Cu: 0.10-0.80%, V: 0.020-0.080%, and the rest is Fe and other inevitable impurities; the rolling process parameters of the steel for low temperature steel bar include: the billet is heated to 1100-1250 DEG C., and the rolling temperature is 900-1060 DEG C., and the finishing temperature is 900-1100 DEG C., and steel is cooled by water cooling after rolling, and the temperature on cold bed is 500-650 DEG C. The steel for low temperature hot rolling ribbed steel bar and the rolling process employ a multiple-element and small-amount alloying principle and a control rolling process, and the nickel content is reasonably reduced, thereby satisfying the usage demand that LNG and other low temperature building engineering reinforced concrete structures can bear -165 DEG C. low temperature, and the steel for low temperature hot rolling ribbed steel bar has good low temperature resistance performance and reliable safety.
Description
Technical field
The present invention relates to Cryogenic Steel and production technique thereof, particularly relate to a kind of vanadium micro-alloying Low Temperature Thermal reinforcing bar steel and rolling technology thereof.
Background technology
Hot rolled ribbed steel bar is the framework material of concrete structure, carry various stress in the structure, sometimes also use under certain low temperature environment, therefore not only require that reinforcing bar has higher intensity and processing performance, but also require to have higher functional--cryophylactic ability.
Typical case needs LNG tank (the being called for short LNG) engineering with the example of low temperature reinforcing bar is petrochemical industry to build and use low temperature resistant reinforcing bar, and its basic demand feature is:
(1) high strength, yield strength >=400MPa or >=500MPa;
(2) production technique does not limit, and can adopt the explained hereafter of immediate quenching;
(3) have certain requirement to low-temperature performance, specifically reached an agreement on by engineering demanding party and supplier, minimum storage-temp-165 DEG C, mainly has certain requirement to cryogenic tensile plasticity, notch sensitivity.
But, there is no the concrete composition of Low Temperature Hot Rolling Ribbed Bar steel and the public technology of rolling technological parameter thereof so far.
Usually the steel used under the low temperature of-10 ~-196 DEG C is called low-temperature steel, the steel used under the low temperature below-196 DEG C is called steel used at ultra-low temperature.Low-temperature steel is broadly divided into 4 classes: carbon aluminium-killed steel, low-temperature high-strength steel, nickel steel and austenitic stainless steel.
(1) carbon aluminium-killed steel.The low-temperature steel that this kind of steel is is principal element with silicon-manganese.For improving the low-temperature flexibility of steel, chemically composition is seen, only must reduce the carbon content in steel as far as possible, improve Mn/C ratio, reduce the harmful element such as sulphur, phosphorus, add appropriate aluminium, crystal grain thinning, the nitrogen in fixing steel improves the toughness of steel, improves aging performance.Low-temperature steel on market belongs to this type of substantially, in GB3531-83, have regulation.Carbon aluminium-killed steel, yield strength is about 290MPa, and the ballistic work under low temperature is 21 ~ 28J, and the main trade mark has 16MnDR, 09Mn2VDR, 09MnTiCuXtDR, 06MnNbDR.
(2) low-temperature high-strength steel.This kind of steel for base with carbon one manganese, adds the low-temperature flexibility that a small amount of nickel chromium triangle improves steel, adds a small amount of molybdenum vanadium to improve the intensity of steel self, when meeting requirement of strength, reducing carbon content as far as possible, improving the toughness of steel, improve weldability, obtained by modifier treatment good in over-all properties.It not only has high strength, and has good low-temperature flexibility, is therefore the material that a kind of obdurability has both, and is mainly used in the spherical tank that coal pressurizes and manufactures various large-scale ethylene project, is widely used in the low-temperature pressure container manufacturing and have elevated pressures.
(3) nickel system low-temperature steel.This kind of steel take nickel as the Cryogenic Steel of main alloy element.Nickel is the most effective element of low-temperature flexibility improving steel, and along with the increase low-temperature flexibility of nickel content in steel improves, minimum use temperature reduces, and it is mainly for the manufacture of the cyrogenic equipment used at-40 ~-196 DEG C.
(4) austenitic stainless steel.The main feature of this kind of steel be that it does not have ductile brittle transition phenomenon.Obtain excellent low-temperature flexibility by solution treatment, even under the low temperature of-196 DEG C, toughness is not almost lost, so austenitic stainless steel mainly uses below at very low temperature (-196 DEG C).
At present, above-mentioned 4 class low-temperature steels are showed no the report of the construction low temperature reinforcing bar that can be used for the low temperature construction works such as LNG.And the construction of the low temperature construction works such as LNG in the urgent need to resistance to-165 DEG C, nickel-saving high-strength Low Temperature Hot Rolling Ribbed Bar.
Summary of the invention
Object of the present invention provide a kind of resistance to-165 DEG C, nickel-saving high-strength vanadium micro-alloying low temperature reinforcing bar steel and rolling technology thereof.
To achieve these goals, the technical solution used in the present invention is:
Vanadium micro-alloying low temperature reinforcing bar steel of the present invention, by weight percentage, chemical composition proportioning is: C:0.05-0.15%, Si:0.15-0.40%, Mn:1.40-1.60%, P≤0.010%, S≤0.010%, Ni:0.50-2.00%, Cu:0.10-0.80%, V:0.020-0.080%, all the other are Fe and inevitable impurity.
Vanadium micro-alloying low temperature reinforcing bar steel of the present invention, with polynary a small amount of alloying principle, carried out testing many times, drawn rational chemical composition proportioning, relative to prior art, the functions and effects of each composition are as follows:
Carbon: the C content of general hot rolled ribbed steel bar is 0.18-0.25% at present, and consider the amount of performance requriements and other alloying element, C content gets 0.05-0.15%, reduces C content and is conducive to improving welding property, improves plasticity and toughness.
Silicon: Si can promote that proeutectoid ferrite is separated out, and the impact formed perlite is little, and inexpensive, Si can improve A
3, A
1stagnation point also has strong solution strengthening effect, but the too high plasticity and toughness to steel of Si are unfavorable, and silicone content ranges preferably from 0.15-0.40%.
Manganese: Mn can reduce A
3, A
1stagnation point, while postponement perlitic transformation, also postpones ferritic transformation, and Mn has solution strengthening and improves hardening capacity effect, and Mn content range is chosen as 1.40-1.60%.
Sulphur, phosphorus: S, P belong to harmful element in this steel, it is more low better to require, after considering, controls by≤0.010%.
Nickel: Ni has the tissue of refinement steel, improves the effect of the low-temperature performance of steel, and has solution strengthening, the effect of raising hardening capacity, but it is expensive, and after reasonable regulations, Ni content range is preferably 1.40-1.60%.
Copper: Cu is similar to Ni in solution strengthening, raising hardening capacity, replaces a part of Ni, Cu also to have improve the corrosion proof effect of steel with Cu.
Vanadium: V, as micro alloying element, can improve reinforced steel bar strength, ensures the strength property of reinforcing bar, and V be China be rich in resource, the V be dissolved in austenite significantly can increase the hardening capacity of steel, and the carbide of the V separated out in ferrite or carbonitride, have significant dispersion-strengthened action.
The rolling technology of this vanadium micro-alloying low temperature reinforcing bar steel, mentioned component scope pressed by Low Temperature Hot Rolling Ribbed Bar steel, steel billet is smelted and is carried out external refining, continuous casting, then rolling in converter, electric arc furnace or other smelting furnace, rolling technological parameter is: heating steel billet to 1100 ~ 1250 DEG C, start rolling temperature is 900 ~ 1060 DEG C, and finishing temperature is 900 ~ 1100 DEG C, rolls rear Water cooling, temperature on cooling table is 500 ~ 650 DEG C, and reinforcing bar is bundling, stacking after naturally cooling on cold bed.In the operation of rolling, steel billet linear velocity is more than 100m/s.Adopt this rolling technology, can ensure that the properties of reinforcing bar reaches requirement.
The invention has the advantages that: this Low Temperature Hot Rolling Ribbed Bar steel and rolling technology thereof, by adopting polynary a small amount of alloying principle, when rationally falling low nickel content, this Low Temperature Hot Rolling Ribbed Bar room-temperature property reaches: yield strength R
eL(R
p0.2)>=500MPa, strong flexor ratio>=1.15, uniform elongation A
gt>=5%;-165 DEG C of low-temperature performancies reach: yield strength R
eL(R
p0.2)>=575MPa(i.e. 1.15 times of design yield strength), uniform elongation A
gt>=3%.
This Low Temperature Hot Rolling Ribbed Bar steel, can meet the user demand of resistance to-165 DEG C of low temperature of low temperature construction work skeleton construction such as LNG, and steel grade nickel content is lower, and this Low Temperature Hot Rolling Ribbed Bar steel resistance to low temperature is good, safe and reliable.
The rolling technology of this Low Temperature Hot Rolling Ribbed Bar steel, by the control to rolling temperature, Water cooling after rolling, can ensure the performance of Low Temperature Hot Rolling Ribbed Bar.
Embodiment
Below by the description to optimum embodiment, the specific embodiment of the present invention is described in further detail.
Embodiment 1
This vanadium micro-alloying low temperature reinforcing bar steel, chemical composition proportioning, is: C:0.11%, Si:0.32% by weight percentage, Mn:1.57%, P:0.008%, S:0.005%, Ni:0.53%, Cu:0.72%, V:0.028%, all the other are Fe and inevitable impurity.
For the steel billet of diameter phi 12mm, the rolling technology of the vanadium micro-alloying low temperature reinforcing bar steel of this φ 12mm, mentioned component scope pressed by steel grade, carries out external refining, continuous casting, continuous merchant bar mill is rolled into hot rolled ribbed steel bar at electric arc furnace smelting.
Rolling technological parameter is: heating steel billet to 1110 ~ 1187 DEG C, and start rolling temperature is 953 ~ 982 DEG C, and finishing temperature is 916 ~ 958 DEG C, rolls rear Water cooling, and temperature on cooling table is 632 ~ 645 DEG C, and reinforcing bar is bundling, stacking after naturally cooling on cold bed.
Embodiment 2
This vanadium micro-alloying low temperature reinforcing bar steel, chemical composition proportioning, is: C:0.12%, Si:0.31% by weight percentage, Mn:1.49%, P:0.006%, S:0.007%, Ni:0.87%, Cu:0.11%, V:0.035%, all the other are Fe and inevitable impurity.
For the steel billet of diameter phi 16mm, the rolling technology of the vanadium micro-alloying low temperature reinforcing bar steel of this φ 16mm, mentioned component scope pressed by steel grade, carries out external refining, continuous casting, continuous merchant bar mill is rolled into hot rolled ribbed steel bar at converter smelting.
Rolling technological parameter is: heating steel billet to 1118 ~ 1205 DEG C, and start rolling temperature is 971 ~ 1021 DEG C, and finishing temperature is 1018 ~ 1062 DEG C, rolls rear Water cooling, and temperature on cooling table is 611 ~ 623 DEG C, and reinforcing bar is bundling, stacking after naturally cooling on cold bed.
Embodiment 3
This vanadium micro-alloying low temperature reinforcing bar steel, chemical composition proportioning, is: C:0.13%, Si:0.19% by weight percentage, Mn:1.52%, P:0.007%, S:0.008%, Ni:0.89%, Cu:0.12%, V:0.043%, all the other are Fe and inevitable impurity.
For the steel billet of diameter phi 20mm, the rolling technology of the vanadium micro-alloying low temperature reinforcing bar steel of this φ 20mm, mentioned component scope pressed by steel grade, carries out external refining, continuous casting, continuous merchant bar mill is rolled into hot rolled ribbed steel bar at converter smelting.
Rolling technological parameter is: heating steel billet to 1152 ~ 1179 DEG C, and start rolling temperature is 1008 ~ 1045 DEG C, and finishing temperature is 1021 ~ 1059 DEG C, rolls rear Water cooling, and temperature on cooling table is 590 ~ 617 DEG C, and reinforcing bar is bundling, stacking after naturally cooling on cold bed.
Embodiment 4
This vanadium micro-alloying low temperature reinforcing bar steel, chemical composition proportioning, is: C:0.07%, Si:0.28% by weight percentage, Mn:1.51%, P:0.006%, S:0.008%, Ni:1.73%, Cu:0.12%, V:0.048%, all the other are Fe and inevitable impurity.
For the steel billet of diameter phi 20mm, the rolling technology of the vanadium micro-alloying low temperature reinforcing bar steel billet of this φ 20mm, mentioned component scope pressed by steel grade, carries out external refining, continuous casting, continuous merchant bar mill is rolled into hot rolled ribbed steel bar at converter smelting.
Rolling technological parameter is: heating steel billet to 1133 ~ 1171 DEG C, and start rolling temperature is 1003 ~ 1038 DEG C, and finishing temperature is 1047 ~ 1070 DEG C, rolls rear Water cooling, and temperature on cooling table is 552 ~ 565 DEG C, and reinforcing bar is bundling, stacking after naturally cooling on cold bed.
Embodiment 5
This vanadium micro-alloying low temperature reinforcing bar steel, chemical composition proportioning, is: C:0.12%, Si:0.27% by weight percentage, Mn:1.49%, P:0.006%, S:0.007%, Ni:0.77%, Cu:0.39%, V:0.053%, all the other are Fe and inevitable impurity.
For the steel billet of diameter phi 25mm, the rolling technology of the vanadium micro-alloying low temperature reinforcing bar steel of this φ 25mm, mentioned component scope pressed by steel grade, carries out external refining, continuous casting, continuous merchant bar mill is rolled into hot rolled ribbed steel bar at electric arc furnace smelting.
Rolling technological parameter is: heating steel billet to 1144 ~ 1201 DEG C, and start rolling temperature is 963 ~ 1011 DEG C, and finishing temperature is 1055 ~ 1079 DEG C, rolls rear Water cooling, and temperature on cooling table is 578 ~ 589 DEG C, and reinforcing bar is bundling, stacking after naturally cooling on cold bed.
Embodiment 6
This vanadium micro-alloying low temperature reinforcing bar steel, chemical composition proportioning, is: C:0.09%, Si:0.29% by weight percentage, Mn:1.55%, P:0.007%, S:0.006%, Ni:1.03%, Cu:0.17%, V:0.061%, all the other are Fe and inevitable impurity.
For the steel billet of diameter phi 25mm, the rolling technology of the vanadium micro-alloying low temperature reinforcing bar steel of this φ 25mm, mentioned component scope pressed by steel grade, carries out external refining, continuous casting, continuous merchant bar mill is rolled into hot rolled ribbed steel bar at electric arc furnace smelting.
Rolling technological parameter is: heating steel billet to 1145 ~ 1193 DEG C, and start rolling temperature is 928 ~ 990 DEG C, and finishing temperature is 1033 ~ 1078 DEG C, rolls rear Water cooling, and temperature on cooling table is 535 ~ 555 DEG C, and reinforcing bar is bundling, stacking after naturally cooling on cold bed.
Embodiment 7
This vanadium micro-alloying low temperature reinforcing bar steel, chemical composition proportioning, is: C:0.08%, Si:0.30% by weight percentage, Mn:1.44%, P:0.004%, S:0.005%, Ni:1.08%, Cu:0.16%, V:0.072%, all the other are Fe and inevitable impurity.
For the steel billet of diameter phi 25mm, the rolling technology of the vanadium micro-alloying low temperature reinforcing bar steel of this φ 25mm, mentioned component scope pressed by steel grade, carries out external refining, continuous casting, continuous merchant bar mill is rolled into hot rolled ribbed steel bar at electric arc furnace smelting.
Rolling technological parameter is: heating steel billet to 1153 ~ 1196 DEG C, and start rolling temperature is 1007 ~ 1033 DEG C, and finishing temperature is 1048 ~ 1055 DEG C, rolls rear Water cooling, and temperature on cooling table is 543 ~ 561 DEG C, and reinforcing bar is bundling, stacking after naturally cooling on cold bed.
Embodiment 8
This vanadium micro-alloying low temperature reinforcing bar steel, chemical composition proportioning, is: C:0.07%, Si:0.27% by weight percentage, Mn:1.49%, P:0.008%, S:0.009%, Ni:1.29%, Cu:0.12%, V:0.078%, all the other are Fe and inevitable impurity.
For the steel billet of diameter phi 32mm, the rolling technology of the vanadium micro-alloying low temperature reinforcing bar steel billet of this φ 32mm, mentioned component scope pressed by steel grade, carries out external refining, continuous casting, continuous merchant bar mill is rolled into hot rolled ribbed steel bar at converter smelting.
Rolling technological parameter is: heating steel billet to 1148 ~ 1183 DEG C, and start rolling temperature is 1018 ~ 1033 DEG C, and finishing temperature is 1037 ~ 1058 DEG C, rolls rear Water cooling, and temperature on cooling table is 508 ~ 523 DEG C, and reinforcing bar is bundling, stacking after naturally cooling on cold bed.
The product performance of the Low Temperature Hot Rolling Ribbed Bar steel of above embodiment rolling are as following table:
The low temperature reinforcing bar product made from steel that above embodiment obtains, all can meet the requirement of resistance to-165 DEG C of low temperature of low temperature construction work skeleton construction such as LNG, and steel grade nickel content is lower, and this low temperature reinforcing bar steel resistance to low temperature is good, safe and reliable.
Above to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention without to improve.
Claims (4)
1. a vanadium micro-alloying low temperature reinforcing bar steel, it is characterized in that: by weight percentage, chemical composition proportioning is: C:0.05-0.09%, Si:0.15-0.40%, Mn:1.40-1.60%, P≤0.010%, S≤0.010%, Ni:0.50--1.29%, Cu:0.10-0.72%, V:0.020-0.048%, all the other are Fe and inevitable impurity.
2. vanadium micro-alloying low temperature reinforcing bar steel as claimed in claim 1, it is characterized in that: wherein the content of C, Si, Mn, Ni, Cu and V is: by weight percentage, C:0.05-0.09%, Si:0.15-0.28%, Mn:1.40-1.49%, Ni:0.50-1.03%, Cu:0.10-0.39%, V:0.020-0.048%.
3. vanadium micro-alloying low temperature reinforcing bar steel as claimed in claim 1, it is characterized in that: wherein the content of C, Si, Mn, Ni, Cu and V is: by weight percentage, Si:0.19-0.27%, Mn:1.49-1.57%, Ni:1.08-1.29%, Cu:0.39-0.72%, V:0.035-0.048%.
4. the rolling technology of vanadium micro-alloying low temperature reinforcing bar steel described in an any one of claims 1 to 3, it is characterized in that: rolling technological parameter is: heating steel billet to 1100 ~ 1250 DEG C, start rolling temperature is 900 ~ 1060 DEG C, finishing temperature is 900 ~ 1100 DEG C, roll rear Water cooling, temperature on cooling table is 500 ~ 650 DEG C.
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