CN105369126A - Production methods of alloy steel and finish rolled threaded reinforcing bar thereof and finish rolled threaded reinforcing bar - Google Patents
Production methods of alloy steel and finish rolled threaded reinforcing bar thereof and finish rolled threaded reinforcing bar Download PDFInfo
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- CN105369126A CN105369126A CN201510920984.XA CN201510920984A CN105369126A CN 105369126 A CN105369126 A CN 105369126A CN 201510920984 A CN201510920984 A CN 201510920984A CN 105369126 A CN105369126 A CN 105369126A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
The invention relates to production methods of an alloy steel and a finish rolled threaded reinforcing bar thereof and the finish rolled threaded reinforcing bar. The alloy steel comprises the following components in percentage by weight: 0.21 to 0.26% of C, 1.5 to 2.0% of Si, 1.2 to 1.8% of Mn, 1.2 to 1.8% of Cr, 0.1 to 0.4% of Ni, 0.15 to 0.4% of Mo, 0.0005 to 0.003% of B, less than 0.035% of P, less than 0.035% of S, and the balance Fe and inevitable impurity elements; one or some of 0.01 to 0.055% of Nb, 0.02 to 0.10% of V, and 0.001 to 0.05% of Ti are added as microalloy elements based on the aforementioned basic components; the alloy steel can be subjected to thermal treatment to obtain PSB1080, PSB930 and PSB830 finish rolled threaded reinforcing bars being more than 50mm in diameter. According to the methods, a new alloy system and hardening and tempering and thermal treatment processes are adopted, so that the whole section of the steel has a fine and uniform microstructure; the toughness and plasticity can be improved while the strength of the finish rolled threaded reinforcing bar is ensured; the finish rolled threaded reinforcing bar is outstanding in combined mechanical properties.
Description
Technical field
The invention belongs to finish rolling deformed bar technical field, specifically relate to production method and the finish rolling deformed bar of a kind of steel alloy and high strength (PSB830, PSB930, PSB1080 rank) super large-scale (diameter > Φ 50mm) finish rolling deformed bar thereof.
Background technology
Twisted Steel for prestressed concrete (also claim finish rolling deformed bar, be all called for short finish rolling deformed bar below) rolls the straight steel bar having externally threaded major diameter, high strength, high dimensional accuracy on whole reinforcing bar.This reinforcing bar carries out anchoring at any section female junctor of band threaded nut that carries out connecting or screw on of all screwing on.Finish rolling deformed bar is widely used in through beam in large hydraulic engineering, industry and covil construction and large-scale skeleton construction, the engineerings such as the big-and-middle bridge beam of highway, railway, Nuclear power plants and earth anchor.It has connection, anchoring is easy, and clinging power is strong, the advantages such as stretch-draw anchor is safe and reliable, easy construction, and saves reinforcing bar, reduces component area and weight.In GB/T20065-2006 " Twisted Steel for prestressed concrete ", the nominal diameter scope of finish rolling deformed bar is 18mm ~ 50mm, the finish rolling deformed bar maximum specification of current domestic production is 75mm, next is 63.5mm, but these two kinds of super large-scale steel are because production difficulty greatly directly affects its performance, output and engineer applied.Therefore in order to meet the demand of China's construction work to super-large diameter finish rolling deformed bar, an urgent demand, under existing production unit condition, develops a kind of new super-large diameter finish rolling deformed bar kind: proof strength and plasticity simultaneously.
At present on production super large-scale (> Φ 50mm) high strength (yield strength >=830MPa) finish rolling deformed bar, also do not have corresponding composition and production technique, therefore this product belongs to the high-end product of high added value.In the production of high-strength finish rolling deformed bar, current technological line mainly comprises:
(1) online Heat Treatment technique improves the intensity of finish rolling deformed bar;
(2) in medium carbon steel, add the alloying elements such as Cr, Mo, obtain abnormal bainite tissue by temper and improve intensity;
(3) in soft steel, bainite structure is obtained by adding the element air coolings such as B.
(4) coordinating tempering heat treatment process by carrying high Mn content, improving intensity.
Improving the aspect of performance of finish rolling deformed bar, domestic patented technology is as follows:
130mm2 medium carbon steel continuous cast billet is adopted in CN101327491A, material composition C:0.36-0.46%, Si:1.4-1.8%, Mn:0.7-1.0%, V:0.08-0.15%, P≤0.045%, S≤0.045%, niobium+titanium <0.10%, surplus Fe, technical process is converter smelting → ladle vanadium micro-alloying → LF refining → full guard casting → steel billet inspection → process furnace heating → controlled rolling → roll rear controlled cooling model, it is characterized in that: casting process adopts the casting of 130mm2 continuous cast billet full guard, casting cycle 40-60min/ stove, Metal in Tundish target superheat degree 20-35 DEG C, pulling rate controls according to 2.0-2.4m/min, Metal in Tundish liquid level 600-800mm, secondary coolingwater is pressed 0.8-1.2L/kg steel and is controlled, control continuously cast bloom shrinkage cavity rank≤1.5 grade, operation of rolling start rolling temperature 950-1100 DEG C, entry temperature at finishing 800-950 DEG C, roll rear employing two-part or the syllogic stepped control type of cooling, go out one cold section of temperature and control between 700-850 DEG C, go out cold bed tempering temperature PSB785 on secondary cooling zone or three cold sections and control between 600-700 DEG C, PSB830 controls at 570-670 DEG C.The deficiency of this method: complex process, needs to wear water by force to material, makes surface have the quench-hardened case of thick layer, and by self-tempering, edging tissue is tempered sorbite, and center is ferrite+perlite.The method is wayward, if though the too thick Strength surplus amount of quench-hardened case is high, and unit elongation can not meet standard-required, if too thin intensity does not reach requirement, and can only for small dimension product, maximum specification is to Φ 40mm.
CN1103673A discloses a kind of air-cooled transformed and treatment process, composition is C%0.28 ~ 0.36, Mn%0.80 ~ 1.20, Cr%0.70 ~ 1.10, Si%0.60 ~ 1.20, Mo%0.20 ~ 0.40, V%0.10 ~ 0.15, all the other are Fe, and restriction S, P content is less than 0.03% respectively; Finishing temperature control is at 880 ~ 900 DEG C, and waste heat, at 200 ~ 300 DEG C of interval tempering air cooling after 2 ~ 3 hours, is organized as abnormal bainite.Although the material intensity adopting this Composition And Process to produce is higher, large gauge Twisted Steel can not be produced.
CN104018059A discloses the bainite finish rolling deformed bar of yield strength >=980MPa, its composition: C0.10 ~ 0.20%, Si0.20 ~ 0.50%, Mn1.80 ~ 2.3%, P≤0.035%, S≤0.035%, B0.0010 ~ 0.0030%, metallographic structure is mainly other entity; Production stage: conventional to smelt and strand, carries out stacking cooling to strand and to room temperature; To strand heating, roughing, finish rolling, natural air cooling to room temperature and substitute.Although this technique utilizes tissue inter-variable to improve intensity, without the need to heat-treating, cost reduces, and the method can only produce Φ 50mm following specification finish rolling deformed bar product.
CN104046907A discloses a kind of yield strength >=960MPa finish rolling deformed bar, composition is 0.235 ~ 0.33%, Si0.45 ~ 0.7%, Mn2.2 ~ 2.4%, P≤0.025%, S≤0.025%, Cr0.1 ~ 0.3%, Ti0.015 ~ 0.03%, V0.04 ~ 0.06%, Als0.006 ~ 0.01%, natural air cooling, tissue is mainly bainite, yield strength >=960MPa, but Mn content is high, easily there is segregation, easily thick martensite is there is in tissue, and production product specification≤50mm.
CN104212961A discloses the temper tempering heat treatment method of the high-strength finish rolling deformed bar of Mn system, the chemical composition of reinforcing bar is: C0.27 ~ 0.31, Si0.70 ~ 1.00%, Mn2.20 ~ 2.70%, P≤0.035%, S≤0.035%, V0.040 ~ 0.080%, Cr0.03 ~ 1.00%, Ti0.01 ~ 0.03%, all the other are Fe and inevitable impurity, 200 ~ 600 DEG C are warmed up to by 3 ~ 6 hours, be incubated 3 ~ 6 hours, stove is cold, obtain PSB830, PSB930, PSB1080 level finish rolling deformed bar, weak point: heat treatment time is oversize, cause the wasting of resources, in steel, add a large amount of Mn easily cause microstructure segregation, cannot improve completely by means of only temper, the toughness plasticity of material cannot be ensured, therefore the method can only produce small dimension, large gauge cannot meet the homogeneity of structure of total cross section, ensure toughness plasticity.
Summary of the invention
In order to solve the problems of the technologies described above, the bright object of we is to provide one and is applicable to super large-scale (diameter > Φ 50mm) high strength (PSB830, PSB930, PSB1080 rank) steel alloy of finish rolling deformed bar and the production method of finish rolling deformed bar thereof and finish rolling deformed bar.
Technical scheme of the present invention is as follows:
One aspect of the present invention provides a kind of steel alloy, it is characterized in that, the composition of described steel alloy is as follows: by weight percentage, C:0.21% ~ 0.26%, Si:1.5% ~ 2.0%, Mn:1.2 ~ 1.8%, Cr:1.2% ~ 1.8%, Ni:0.1% ~ 0.4%, Mo:0.15% ~ 0.4%, B:0.0005% ~ 0.003%, P<0.035%, S<0.035%; On the basis of above-mentioned basal component, add one or more in Nb:0.01% ~ 0.055%, V:0.02% ~ 0.10%, Ti:0.001% ~ 0.05% as microalloy element simultaneously; Surplus is Fe and inevitable impurity element.
In a preferred technical scheme, the composition of described steel alloy is as follows: by weight percentage, C:0.24% ~ 0.26%, Si:1.7% ~ 1.9%, Mn:1.2 ~ 1.8%, Cr:1.2% ~ 1.4%, Ni:0.3% ~ 0.4%, Mo:0.3% ~ 0.4%, B:0.0005% ~ 0.003%, P<0.035%, S<0.035%; On the basis of above-mentioned basal component, add one or more in Nb:0.01% ~ 0.055%, V:0.02% ~ 0.10%, Ti:0.03% ~ 0.05% as microalloy element simultaneously; Surplus is Fe and inevitable impurity element.
The present invention additionally provides the production method of the finish rolling deformed bar using above-mentioned steel alloy on the other hand, the diameter >50mm of described finish rolling deformed bar; It is characterized in that, the production method of described finish rolling deformed bar is specific as follows:
First adopt smelting, continuous casting and rolling method to obtain Twisted Steel, the Twisted Steel then described in thermal treatment obtains PSB1080, PSB930, PSB830 rank finish rolling deformed bar; Concrete thermal treatment process is as follows:
After 850 ~ 950 DEG C of quenchings, 400 ~ 500 DEG C of temper, obtain PSB1080;
After 850 ~ 950 DEG C of quenchings, 501 ~ 600 DEG C of temper, obtain PSB930;
After 850 ~ 950 DEG C of quenchings, 601 ~ 700 DEG C of temper, obtain PSB830.
In a preferred technical scheme, the concrete steps of described smelting, continuous casting and rolling method are:
(1) conventional smelting, selects 220mm × 300m rectangular billet CC;
(2) to rectangular billet CC heating, Heating temperature is controlled: 1200 ~ 1250 DEG C; Heat-up time 120min ~ 240min;
(3) normal rolling, natural air cooling, obtained Twisted Steel.
The present invention additionally provides a kind of finish rolling deformed bar, the diameter >50mm of described finish rolling deformed bar on the other hand; It is characterized in that: described finish rolling deformed bar adopts the production method of above-mentioned finish rolling deformed bar to obtain.
In steel alloy of the present invention, the effect of each element in steel alloy is as follows:
C: carbon is Qianghian gap solution strengthening element, it is the element improving strength of materials less expensive, but can not mainly rely on its improve intensity, and when content lower than 0.24% time, cannot the strength of materials be ensured, by adding a large amount of alloying element, uneconomical, when content higher than 0.26% time, be both unfavorable for the nucleation and growth of bainite, cannot ensure the toughness plasticity of material, C of the present invention should control 0.24 ~ 0.26%.
Si: silicon normally uses as solution strengthening element.Silicon often deposits element in steel, and mainly exist with solid solution state in steel, the silicon of solid solution will produce obvious solution strengthening effect.Si is the element expanding ferrite area, but Si adds in steel, kinetically postponing the precipitation of carbides in austenite, to stable residual austenite, obtains carbide-free Bainite and plays a driving role.The Si added more than 1.9% cannot ensure the toughness plasticity of material.Therefore, the upper limit of Si is 1.9%.
Mn: manganese is important highly malleablized element, mainly plays solution strengthening effect, in certain content range, the increase of the intensity Fe content of steel and improving.Mn and B combines, and makes obviously be longer than middle temperature transformation the incubation period of high temperature transformation, is conducive to like this, within the scope of wider cooling rate, obtaining bainite structure completely.The effect of manganese also landing low transformation temperature, the growing up of crystal grain after can preventing phase transformation, contributes to the refinement realizing bainite Effective grain size.But when Mn content is greater than 1.8%, easily occurs macrosegregation, cause uneven microstructure, occur massive martensite, therefore the upper limit of Mn is 1.8%.
P: phosphorous segregation in austenite grain boundary, thus reduces grain-boundary strength.Therefore, P content is low as much as possible, and the upper limit should be 0.035%.
S: sulphur is combined with manganese and forms inclusion MnS.When stretching because of rolling, longitudinal toughness declines because of the impact of MnS.Therefore, S content must be made low as much as possible, its upper limit is 0.035%.
Cr: although reduce austenitic area element, it can be postponed proeutectoid ferrite and change, and reduces bainite formation temperature, and therefore, in order to form bainite within the scope of wider cooling rate, the lower limit of Cr controls 1.2%.
B: the boron of trace (0.001%) just can increase the hardening capacity of steel exponentially, boron is as improving hardening capacity, controlling the trace element of weave construction, in the development of bainitic steel, have very special effect, boron quite significantly segregation remarkable ferrite of postponing on crystal boundary adds pearlitic transformation.The segregation of boron on crystal boundary plays a part very large to the ferritic precipitation of suppression.Add B when being less than 0.0005%, hardening capacity requirement cannot be met to large-diameter material, and add this effect when B ultrasonic crosses 0.0030% and be just saturated.Therefore B amount is added in the scope of 0.0005-0.0030%.
The acting in conjunction of Mo: molybdenum can reduce Bs transition temperature, Mo and B can make ferrite precipitation line obviously move to right, and strongly postpones ferritic transformation, thus can both obtain bainite structure completely within the scope of wider speed of cooling.Improve the Mo content in steel, the intensity of steel significantly improves, but during along with being increased to more than 0.4% of Mo content, the toughness of steel significantly worsens.Therefore, upper limit Mo content controls 0.4%.
Ni: nickel expands austenitic area element, and Ni can reduce the ceiling temperature that bainite is formed simultaneously, lowers nucleation rate and the growth rate of bainite, transformation is postponed.
Ti: must add titanium in boron steel, it can fixed nitrogen effectively, and titanium has been combined the effect protecting B with nitrogen.Ti, N form TiN, effectively can stop the alligatoring of austenite crystal during heat.
V: vanadium has the effect being improved intensity by precipitation strength.But, add V and more than 0.10%, toughness plasticity worsened.Therefore the scope adding V is not more than 0.10%.For obtaining the effect improving intensity fully, preferably add the V more than 0.02%.
Nb: the micro-Nb deformation and recrystallization behavior that can suppress high temperature austenite, improves recrystallization temperature, expands non-recrystallization zone.Because Nb, B mutually promote, making compound add than adding Nb or B separately, more can play a role.Produce the carbonitride Nb (C, N) of the infusibility of a large amount of Dispersed precipitate, pinning dislocation in drawing process, make dislocation be not easy to recover and disappear, ensure the intensity of matrix.The compound of Nb and B etc. adds, and reduces the transition temperature of bainite, further thinning microstructure, improves matrix Dislocations density.
The present invention, by setting up new alloy system and quenching-and-tempering process, ensure that refinement and the homogenizing of steel whole cross section microtexture, while the intensity ensureing finish rolling deformed bar, improves toughness plasticity, namely has good mechanical property.
The product specification of the finish rolling deformed bar that the present invention produces is Φ 63.5mm, Φ 75mm, and performance index are as follows:
PSB830: for yield strength is greater than 830MPa, tensile strength is greater than 1030MPa, and uniform elongation is greater than 6%;
PSB930: for yield strength is greater than 930MPa, tensile strength is greater than 1080MPa, and uniform elongation is greater than 6%;
PSB1080: for yield strength is greater than 1080MPa, tensile strength is greater than 1230MPa, and uniform elongation is greater than 6%.
Embodiment
Be described in detail the production method of steel alloy of the present invention and finish rolling deformed bar thereof and finish rolling deformed bar below in conjunction with specific embodiment, the steel product ingredient of each embodiment is in Table.
The composition (weight percent, wt%) of the steel alloy of each embodiment of table 1
Numbering | C | Si | Mn | Cr | Ni | Mo | B | Nb | V | Ti |
1 | 0.21 | 2.0 | 1.2 | 1.8 | 0.4 | 0.15 | 0.0005 | - | - | 0.05 |
2 | 0.25 | 1.9 | 1.7 | 1.3 | 0.3 | 0.4 | 0.003 | - | - | 0.04 |
3 | 0.26 | 1.5 | 1.8 | 1.2 | 0.1 | 0.15 | 0.02 | - | - | 0.001 |
4 | 0.21 | 1.9 | 1.2 | 1.8 | 0.1 | 0.2 | 0.0008 | - | 0.05 | - |
5 | 0.24 | 1.8 | 1.7 | 1.3 | 0.2 | 0.4 | 0.003 | - | 0.1 | - |
6 | 0.26 | 1.5 | 1.8 | 1.7 | 0.3 | 0.3 | 0.001 | - | 0.08 | - |
7 | 0.21 | 1.5 | 1.8 | 1.2 | 0.4 | 0.15 | 0.002 | 0.03 | - | - |
8 | 0.25 | 2.0 | 1.6 | 1.6 | 0.3 | 0.2 | 0.0005 | 0.055 | - | - |
9 | 0.26 | 1.5 | 1.2 | 1.8 | 0.1 | 0.4 | 0.0012 | 0.01 | - | - |
Remarks: surplus is Fe and inevitable impurity element.
PSB1080 level finish rolling deformed bar adopts following thermal treatment process:
Embodiment 1: trade mark PSB1080 format diameter Φ 63.5mm
The heat treating method of material of the present invention adopts following concrete technology: fining twisted steel 950 DEG C quenching, 500 DEG C of temper.Tensile strength Rm=1345MPa, yield strength Rel=1095MPa, elongation after fracture 15.5%, meets PSB1080 performance requriements.
Embodiment 2: trade mark PSB1080 format diameter Φ 75mm
The heat treating method of material of the present invention adopts following concrete technology: fining twisted steel 950 DEG C quenching, 500 DEG C of temper.The high-strength finish rolling deformed bar of gained: tensile strength Rm=1291MPa, yield strength Rel=1118MPa, elongation after fracture 10.5%, meets PSB1080 performance requriements.
Embodiment 3: trade mark PSB1080 format diameter Φ 75mm
The heat treating method of material of the present invention adopts following concrete technology: fining twisted steel 870 DEG C quenching, 400 DEG C of temper.The high-strength finish rolling deformed bar of gained: tensile strength Rm=1412MPa, yield strength Rel=1248MPa, elongation after fracture 18%, meets PSB1080 performance requriements.
Embodiment 4: trade mark PSB1080 format diameter Φ 63.5mm
The heat treating method of material of the present invention adopts following concrete technology: fining twisted steel 850 DEG C quenching, 400 DEG C of temper.The high-strength finish rolling deformed bar of gained: tensile strength Rm=1548MPa, yield strength Rel=1226MPa, elongation after fracture 9.5%, meets PSB1080 performance requriements.
PSB930 level finish rolling deformed bar adopts following thermal treatment process:
Embodiment 5: trade mark PSB930 format diameter Φ 63.5mm
The heat treating method of material of the present invention adopts following concrete technology: fining twisted steel 950 DEG C quenching, 590 DEG C of temper.The high-strength finish rolling deformed bar of gained: tensile strength Rm=1211MPa, yield strength Rel=991MPa, elongation after fracture 12.5%, meets PSB930 performance requriements.
Embodiment 6: trade mark PSB930 format diameter Φ 75mm
The heat treating method of material of the present invention adopts following concrete technology: fining twisted steel 950 DEG C quenching, 600 DEG C of temper.The high-strength finish rolling deformed bar of gained: tensile strength Rm=1080MPa, yield strength Rel=963MPa, elongation after fracture 16%, meets PSB930 performance requriements.
Embodiment 7: trade mark PSB930 format diameter Φ 63.5mm
The heat treating method of material of the present invention adopts following concrete technology: fining twisted steel 920 DEG C quenching, 600 DEG C of temper.The high-strength finish rolling deformed bar of gained: tensile strength Rm=1178MPa, yield strength Rel=968MPa, elongation after fracture 15%, meets PSB930 performance requriements.
Embodiment 8: trade mark PSB930 format diameter Φ 75mm
The heat treating method of material of the present invention adopts following concrete technology: fining twisted steel 920 DEG C quenching, 550 DEG C of temper.The high-strength finish rolling deformed bar of gained: tensile strength Rm=1230MPa, yield strength Rel=986MPa, elongation after fracture 11.5%, meets PSB930 performance requriements.
Embodiment 9: trade mark PSB930 format diameter Φ 63.5mm
The heat treating method of material of the present invention adopts following concrete technology: fining twisted steel 870 DEG C quenching, 510 DEG C of temper.The high-strength finish rolling deformed bar of gained: tensile strength Rm=1427MPa, yield strength Rel=996MPa, elongation after fracture 10.5%, meets PSB930 performance requriements.
PSB830 level finish rolling deformed bar adopts following thermal treatment process:
Embodiment 10: trade mark PSB830 format diameter Φ 63.5mm
The heat treating method of material of the present invention adopts following concrete technology: fining twisted steel 920 DEG C quenching, 680 DEG C of temper.The high-strength finish rolling deformed bar of gained: tensile strength Rm=995MPa, yield strength Rel=838MPa, elongation after fracture 22%, meets PSB830 performance requriements.
Embodiment 11: trade mark PSB830 format diameter Φ 75mm
The heat treating method of material of the present invention adopts following concrete technology: fining twisted steel 950 DEG C quenching, 700 DEG C of temper.The high-strength finish rolling deformed bar of gained: tensile strength Rm=1006MPa, yield strength Rel=843MPa, elongation after fracture 22%, meets PSB830 performance requriements.
Embodiment 12: trade mark PSB830 format diameter Φ 63.5mm
The heat treating method of material of the present invention adopts following concrete technology: fining twisted steel 940 DEG C quenching, 650 DEG C of temper.The high-strength finish rolling deformed bar of gained: tensile strength Rm=1017MPa, yield strength Rel=877MPa, elongation after fracture 18%, meets PSB830 performance requriements.
Embodiment 13: trade mark PSB830 format diameter Φ 75mm
The heat treating method of material of the present invention adopts following concrete technology: fining twisted steel 930 DEG C quenching, 650 DEG C of temper.The high-strength finish rolling deformed bar of gained: tensile strength Rm=1009MPa, yield strength Rel=859MPa, elongation after fracture 17%, meets PSB830 performance requriements.
Embodiment 14: trade mark PSB830 format diameter Φ 63.5mm
The heat treating method of material of the present invention adopts following concrete technology: fining twisted steel 850 DEG C quenching, 620 DEG C of temper.The high-strength finish rolling deformed bar of gained: tensile strength Rm=1047MPa, yield strength Rel=897MPa, elongation after fracture 12.5%, meets PSB830 performance requriements.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
Claims (5)
1. a steel alloy, it is characterized in that, the composition of described steel alloy is as follows: by weight percentage, C:0.21% ~ 0.26%, Si:1.5% ~ 2.0%, Mn:1.2 ~ 1.8%, Cr:1.2% ~ 1.8%, Ni:0.1% ~ 0.4%, Mo:0.15% ~ 0.4%, B:0.0005% ~ 0.003%, P<0.035%, S<0.035%; On the basis of above-mentioned basal component, add one or more in Nb:0.01% ~ 0.055%, V:0.02% ~ 0.10%, Ti:0.001% ~ 0.05% as microalloy element simultaneously; Surplus is Fe and inevitable impurity element.
2. a kind of steel alloy according to claim 1, it is characterized in that, the composition of described steel alloy is as follows: by weight percentage, C:0.24% ~ 0.26%, Si:1.7% ~ 1.9%, Mn:1.2 ~ 1.8%, Cr:1.2% ~ 1.4%, Ni:0.3% ~ 0.4%, Mo:0.3% ~ 0.4%, B:0.0005% ~ 0.003%, P<0.035%, S<0.035%; On the basis of above-mentioned basal component, add one or more in Nb:0.01% ~ 0.055%, V:0.02% ~ 0.10%, Ti:0.03% ~ 0.05% as microalloy element simultaneously; Surplus is Fe and inevitable impurity element.
3. adopt a production method for the finish rolling deformed bar of the steel alloy described in claim 1 or 2, the diameter >50mm of described finish rolling deformed bar; It is characterized in that, the production method of described finish rolling deformed bar is specific as follows:
First, smelting, continuous casting and rolling method is adopted to obtain Twisted Steel;
Then the Twisted Steel, described in thermal treatment obtains PSB1080, PSB930, PSB830 rank finish rolling deformed bar; Concrete thermal treatment process is as follows:
After 850 ~ 950 DEG C of quenchings, 400 ~ 500 DEG C of temper, obtain PSB1080;
After 850 ~ 950 DEG C of quenchings, 501 ~ 600 DEG C of temper, obtain PSB930;
After 850 ~ 950 DEG C of quenchings, 601 ~ 700 DEG C of temper, obtain PSB830.
4. the production method of a kind of finish rolling deformed bar according to claim 3, is characterized in that, the concrete steps of described smelting, continuous casting and rolling method are:
(1) conventional smelting, selects 220mm × 300m rectangular billet CC;
(2) to rectangular billet CC heating, Heating temperature is controlled: 1200 ~ 1250 DEG C; Heat-up time 120min ~ 240min;
(3) normal rolling, natural air cooling, obtained Twisted Steel.
5. a finish rolling deformed bar, the diameter >50mm of described finish rolling deformed bar; It is characterized in that: described finish rolling deformed bar adopts the production method of the finish rolling deformed bar described in claim 3 or 4 to obtain.
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Cited By (6)
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CN106350733A (en) * | 2016-09-19 | 2017-01-25 | 石横特钢集团有限公司 | PSB1080 finish-rolled threaded bar and production process thereof |
CN106521349A (en) * | 2016-11-10 | 2017-03-22 | 钢铁研究总院 | Economical high-strength finish-rolled thread reinforcement and production method |
CN108676989A (en) * | 2018-05-07 | 2018-10-19 | 河钢股份有限公司承德分公司 | A kind of heat treatment method of PSB1080 bainites finish rolling deformed bar |
CN109972035A (en) * | 2019-03-28 | 2019-07-05 | 江苏省沙钢钢铁研究院有限公司 | 800 MPa-level hot-rolled twisted steel and production method thereof |
CN112410669A (en) * | 2020-11-18 | 2021-02-26 | 江苏永钢集团有限公司 | Corrosion-resistant PSB830 finish-rolled deformed steel bar and production process thereof |
CN112458371A (en) * | 2020-12-07 | 2021-03-09 | 邯郸市倚道金属制品有限公司 | Fine-rolled deformed steel bar formula with good performance and heat treatment method of fine-rolled deformed steel bar |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN106350733A (en) * | 2016-09-19 | 2017-01-25 | 石横特钢集团有限公司 | PSB1080 finish-rolled threaded bar and production process thereof |
CN106521349A (en) * | 2016-11-10 | 2017-03-22 | 钢铁研究总院 | Economical high-strength finish-rolled thread reinforcement and production method |
CN108676989A (en) * | 2018-05-07 | 2018-10-19 | 河钢股份有限公司承德分公司 | A kind of heat treatment method of PSB1080 bainites finish rolling deformed bar |
CN109972035A (en) * | 2019-03-28 | 2019-07-05 | 江苏省沙钢钢铁研究院有限公司 | 800 MPa-level hot-rolled twisted steel and production method thereof |
CN109972035B (en) * | 2019-03-28 | 2020-12-22 | 江苏省沙钢钢铁研究院有限公司 | 800 MPa-level hot-rolled twisted steel and production method thereof |
CN112410669A (en) * | 2020-11-18 | 2021-02-26 | 江苏永钢集团有限公司 | Corrosion-resistant PSB830 finish-rolled deformed steel bar and production process thereof |
CN112458371A (en) * | 2020-12-07 | 2021-03-09 | 邯郸市倚道金属制品有限公司 | Fine-rolled deformed steel bar formula with good performance and heat treatment method of fine-rolled deformed steel bar |
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