CN100507055C - Yield strength 700MPa grade atmospheric corrosion resistant steel and method for manufacturing same - Google Patents
Yield strength 700MPa grade atmospheric corrosion resistant steel and method for manufacturing same Download PDFInfo
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Abstract
The atmospheric corrosion resistant steel with yield strength of 700 MPa level has the chemical composition comprising C 0.05-0.10 wt%, Si not more than 0.50 wt%, Mn 0.8-1.6 wt%, P not more than 0.020 wt%, S not more than 0.010 wt%, Al 0.01-0.05 wt%, Cu 0.20-0.55 wt%, Cr 0.40-0.80 wt%, Ni 0.12-0.40 wt%, Ca 0.001-0.006 wt%, N 0.001-0.006 wt% and Fe and inevitable impurity for the rest. Its production process includes the following steps: 1. smelting and casting to form steel billet; 2. heating the steel billet to over 1200 deg.c, finish rolling at 950 deg.c in the final temperature lower than 910 deg.c and lowered with the increased plate thickness; and 3. cooling in the rate of 5-15 deg/s to 450-650 deg.c, winding and air cooling to room temperature. The atmospheric corrosion resistant steel has excellent comprehensive mechanical performance, yield strength over 700 MPa, high weather resistance and other advantages.
Description
Technical field
The present invention relates to low alloy steel and make the field, particularly yield strength is ultrahigh-strength atmospheric-corrosion resistant steel and the manufacture method thereof of 700MPa.
Background technology
Low-alloy structural steel resisting atmosphere corrosion is widely used in outdoor steel structures such as building, bridge, freight container, vehicle, tower mast and makes the field.It is based on low carbon manganese steel, adds Low-Alloy Corrosion Resistant elements such as a small amount of Cr, Cu, Ni, impels the rusty scale structure of steel to change, and helps slowing down atomospheric corrosion speed, significantly improves the atmospheric corrosion resistance of steel.
Chinese patent application numbers 200410061112.4 discloses " acicular structure high strength weathering steel and production method thereof ", utmost point low-carbon (LC), the adding of Cu-Cr-Ni-Mo-Nb and two or more the compound interpolation among Ti-Al-Zr-RE or the Ca are adopted in its composition design, with carbon content be controlled near or less than the maxima solubility 0.0218% of carbon under the normal temperature in α-Fe, with separating out of minimizing or inhibition cementite, guarantee that master control is organized as uniform acicular structure, to obtain good weather resistance.This patent has adopted smelts the very big utmost point low carbon content design of difficulty, and carbon content is 0.01-0.04%, has increased production difficulty and manufacturing cost greatly, and its accessible yield strength only is 490-540MPa, far below the 700MPa rank that the present invention reached.
Just like U.S. Patent number US6056833 the high-strength weathering steel that a kind of employing two stages hot rolling TMCP method is produced is disclosed also, and yield strength 70-75ksi (about 483-518MPa), have low yield strength ratio less than 0.85.Although this patent has adopted the design of Cu-Cr-Ni weathering resistance composition and Nb-Ti-Mo microalloy design equally, but this patent has been added V element 0.06-0.14% especially, add V element and not only increased manufacturing cost greatly, and be unfavorable for the welding property and the low temperature impact properties of steel plate.
Summary of the invention
The objective of the invention is to design a kind of Yield strength 700 MPa grade atmospheric corrosion resistant steel and manufacture method thereof, steel grade adopts the composition design and the continuous casting and rolling manufacturing process of simple economy, roll attitude delivery and need not thermal treatment, have good welding property and atmospheric corrosion resistance, and have the above Extra High Strength of Yield strength 700 MPa.
For achieving the above object, technical scheme of the present invention is,
Composition of the present invention adopts microalloy strengthening elements such as Cu-Cr-Ni and Nb, Ti, Mo to form, and adopts hot rolling TMCP mode to produce, and rolls attitude delivery, needn't heat-treat, and is with short production cycle, production method is simple, and steel product cost is lower.
Yield strength 700 MPa grade atmospheric corrosion resistant steel, its Chemical Composition weight percent is:
C 0.05-0.10
Si ≤0.50
Mn 0.80～1.60
P ≤0.020
S ≤0.010
Al 0.01-0.05
Cu 0.20-0.55
Cr 0.40-0.80
Ni 0.12-0.40
Ca 0.001-0.006
N 0.001-0.006
Surplus is Fe and unavoidable impurities element.
Again, Yield strength 700 MPa grade atmospheric corrosion resistant steel of the present invention also comprises Nb≤0.07, Ti≤0.18, two or more in Mo≤0.35.
C in steel, exist with the carbide form and alloying element in conjunction with the effect of performance precipitation strength and crystal grain thinning, thereby addition must not be lower than 0.05%, and too high C content is unfavorable for welding, thereby limits C content and must not be higher than 0.10%;
Si is the element that adds for steel is carried out deoxidation, and Si content is many can to cause weldability and welding heat influence area toughness to worsen, thereby its upper limit is defined as 0.50%;
Mn is important highly malleablized element, plays solution strengthening, improves the intensity and the toughness of steel, but Mn content too much makes hardening capacity increase, thereby causes weldability and welding heat influence area toughness to worsen, so regulation Mn content is 0.8%-1.6%;
S and P are very big to the toughness influence of steel plate, thereby should strictly control S, P content, and steel grade of the present invention must adopt and hang down the design of P composition as easy solder type weather resisting steel; High S content not only reduces the low-temperature flexibility of steel, and promotes the anisotropy of steel plate, sulfide inclusion that the weather resistance of steel is also obviously reduced.Thereby extremely low S, P content are adopted in steel grade design of the present invention.
Al is the element that adds for deoxidation in the steel, adds an amount of Al and helps crystal grain thinning, improves the toughness and tenacity of steel;
Cr is not only the element of the hardening capacity that improves steel, and Cr content can effectively improve the atmospheric corrosion resistance of steel 0.40% when above, and its content is too high will the severe exacerbation welding property, so Cr content should be limited to 0.40%-0.80%.
Ni can improve hardening capacity, significantly improves the low-temperature flexibility of steel, is to improve the weathering resistance of steel and the favourable element of obdurability, can not cause disadvantageous effect to the weldability and the welding heat influence area toughness of steel.Ni can also effectively stop the hot-short check crack that causes of Cu.Content is limited to 0.12%-0.40%, is less than 0.12% above-mentioned having little effect, and is higher than 0.40% and then can improves the cost of steel, and easily cause the steel plate iron scale to be difficult to come off.
Cu has the effect identical substantially with Ni, mainly plays solid solution and precipitation strength effect in steel.The suitable proportioning of Cu-Cr-Ni is the element that improves the atmospheric corrosion resistance most critical of steel, if but Cu content is higher than at 0.55% o'clock, not only can damage welding heat influence area toughness, and check crack easily takes place during hot rolling, bring difficulty to production, so Cu content is limited to 0.20%-0.55%.
Handle the form that to control sulfide by Ca, improve the anisotropy of steel plate, improve low-temperature flexibility, its content is less than at 0.001 o'clock does not have effect, surpasses 0.006 and then can produce many CaO, CaS, and form large-scale inclusion, toughness to steel causes damage, even influences the welding property of steel.So regulation Ca content range is 0.001%-0.006%.
Steel grade of the present invention is further to improve performance, also optionally adds elements such as Nb, Ti, Mo, can obtain better effect aspect raising intensity and the toughness.Nb, Ti, Mo can form trickle carbonitride, help the effect of crystal grain thinning tissue and performance precipitation strength, but Nb content was above 0.07% o'clock, perhaps Ti content surpasses 0.18%, perhaps Mo content was above 0.35% o'clock, then welding heat influence area toughness there is adverse influence, thereby the upper limit of above-mentioned element is limited.
The present invention also provides the production method of 700MPa yield strength Weather-resistant low alloy steel of the present invention, and it comprises the steps:
A) smelt, be cast into steel billet, its Chemical Composition weight percent of Weather-resistant low alloy steel:
C:0.05-0.10, Si≤0.50, Mn:0.8～1.6, P≤0.020, S≤0.010, Al:0.01-0.05, Cu:0.20-0.55, Cr:0.40-0.80, Ni:0.12-0.40, Ca:0.001-0.006, N:0.001-0.006, surplus is Fe and unavoidable impurities element;
B) steel billet adopts the controlled rolling of two stages at reheat more than 1200 ℃, is beginning finish rolling more than 950 ℃, and the finish rolling finishing temperature is lower than 910 ℃, and along with the increase finishing temperature of finished product thickness of slab is answered corresponding reduction;
C) be cooled to 450 ℃ to 650 ℃ with the rate of cooling of 5～15 ℃/S then and batch, the increase according to thickness of slab suitably reduces coiling temperature too, and then air cooling is to room temperature,
Contain Nb≤0.07 in addition, Ti≤0.18, two or more in Mo≤0.35, surplus is Fe and unavoidable impurities element.
Steel grade of the present invention does not need to roll postheat treatment.Because having adopted the controlled rolling of two stages, low temperature finish to gauge, quick process for cooling produces, give full play to the effect of Nb, the precipitation strength of Ti microalloy element, by TMCP technology, can make the micro-metallographic structure of steel plate present the superfine crystal particle ferrite and add complex tissues such as a small amount of bainite, a small amount of perlite, thereby steel grade of the present invention takes all factors into consideration organic cooperation of alloy ingredient and technology, makes steel plate obtain higher yield strength and comprehensive mechanical property by mechanism such as precipitation strength, grain refining reinforcement, build ups.Referring to table 1.
Table 1 steel of the present invention contrasts with Chemical Composition, the mechanical property of contrast steel grade
As can be seen, it is obviously different that the present invention and the Chemical Composition of Comparative Examples 1 have from above-mentioned table 1, and C content of the present invention is 0.05～0.10%, and the C content of Comparative Examples 1 is 0.01～0.04%; Steel of the present invention is also different with the Chemical Composition of compared steel 2,3, and steel of the present invention does not add V, is 0.01～0.15% and Comparative Examples 2 requires V content, and it is 0.06～0.14% that Comparative Examples 3 requires V content.
The mechanical property requirements of steel of the present invention is different with the Comparative Examples steel, steel grade yield strength of the present invention can satisfy the performance index that are not less than 700MPa, and the yield strength of three Comparative Examples steel grades requires all to be lower than 550MPa, so steel grade of the present invention significantly is better than the Comparative Examples steel grade on indexs such as intensity.
The present invention has following advantage:
1. steel of the present invention has good comprehensive mechanical property, and yield strength is not less than 700MPa, improves greatly than common weathering steel intensity, increases weight capacity, is fit to the design of steel plate attenuate;
2. steel of the present invention has good atmospheric corrosion resistance, added weather-resistant elements such as Cu, Cr, Ni in steel, guaranteed that its atmospheric corrosion resistance is not less than common weathering steel, weathering resistance is 2-8 times of common iron, steel are long more duration of service, can bring into play this advantage more;
3. steel of the present invention has good welding property, recommends by rational composition design and welding material, can effectively improve welding efficiency, obtains good property of welded joint;
4. steel grade of the present invention adopts cooling controlling and rolling controlling process production, rolls attitude delivery, and production technique is simple, and is with short production cycle, and steel product cost is lower, all can implement at various smelters.
5. this steel also has processed and applied performances such as good welding, clod wash except that possessing Extra High Strength, high atmospheric corrosion resistance.
6. the application of steel grade of the present invention can improve the safe reliability of structure and product greatly, be fit to make freight container, vehicle structure or the like, substitute traditional weathering steel, structure iron, the attenuate of realizing steel plate uses, alleviate deadweight, improve capacity, steel grade of the present invention also is fit to the steel construction of other outdoor utility, as engineering machinery, tower mast rail post, building structure or the like.
Embodiment
Embodiment 1
Learn the composition requirement according to tempering of the present invention, adopt converter smelting, carry out furnace rear refining then, obtain Chemical Composition and see Table 2, continuous casting is cut base and is sent hot rolling line, and billet heating temperature is 1210 ℃, adopts the controlled rolling of two stages and rolls back water-cooled and batching, finishing temperature is 820 ℃-880 ℃, and coiling temperature is 550 ℃-650 ℃.
Embodiment 2
According to steel constitution requirement of the present invention, on 300 tons of oxygen top and bottom combined blown converters, smelt steel of the present invention, after the RH vacuum outgas is handled, adopt the calcium treatment technology, whole process protectiveness continuous casting; Chemical Composition embodiment sees Table 2; Steel billet reheat temperature is 1215 ℃, and the roughing start rolling temperature is 1185 ℃, and the finish rolling start rolling temperature is 950 ℃, and the finish rolling finishing temperature is 865 ℃, 825 ℃, and the rate of cooling with 8 ℃/S, 11 ℃/S is cooled to 575 ℃, 550 ℃ then, and air cooling is to room temperature.Rolling thickness is respectively 3mm, 6mm.The embodiment mechanical property sees table 3 for details.The corrosion resisting property test result sees Table 4.
Table 2
| Sequence number | C | Si | Mn | P | S | Mo | Alt | Cu | Cr | Ni | Nb | Ti | Ca |
| 1 | 0.051 | 0.10 | 1.10 | 0.010 | 0.004 | 0.14 | 0.030 | 0.49 | 0.56 | 0.38 | 0.051 | 0.09 | 0.0042 |
| 2 | 0.092 | 0.25 | 0.90 | 0.012 | 0.003 | 0.19 | 0.038 | 0.38 | 0.65 | 0.28 | 0.064 | 0.12 | 0.0058 |
| 3 | 0.065 | 0.23 | 0.85 | 0.013 | 0.001 | 0.32 | 0.040 | 0.22 | 0.77 | 0.18 | 0.058 | 0.17 | 0.0035 |
| 4 | 0.072 | 0.42 | 1.52 | 0.009 | 0.002 | 0.35 | 0.022 | 0.35 | 0.62 | 0.32 | 0.035 | 0.13 | 0.0041 |
| 5 | 0.065 | 0.32 | 1.45 | 0.010 | 0.001 | 0.25 | 0.032 | 0.30 | 0.60 | 0.32 | 0.040 | 0.11 | 0.0044 |
| 6 | 0.062 | 0.33 | 0.82 | 0.013 | 0.006 | 0.22 | 0.030 | 0.52 | 0.78 | 0.20 | 0.050 | 0.16 | 0.0038 |
| 7 | 0.084 | 0.20 | 1.20 | 0.011 | 0.002 | 0.11 | 0.010 | 0.55 | 0.71 | 0.12 | 0.070 | 0.18 | 0.0060 |
| 8 | 0.085 | 0.30 | 0.80 | 0.016 | 0.001 | 0.16 | 0.050 | 0.20 | 0.40 | 0.20 | 0.064 | 0.12 | 0.0058 |
| 9 | 0.060 | 0.50 | 1.60 | 0.013 | 0.002 | 0.33 | 0.045 | 0.42 | 0.70 | 0.14 | 0.055 | 0.15 | 0.0010 |
Table 3 invention steel embodiment-mechanical property
| Thickness of slab | Re(MPa) | Rm(MPa) | A(％) | 90 ° of clod wash d=1.5a |
| 3mm | 775，752 | 837，842 | 25，24 | Qualified, qualified |
| 6mm | 711，769 | 795，832 | 24，19 | Qualified, qualified |
As seen from Table 3, steel of the present invention has excellent yield strength performance, and yield strength all more than 700MPa, is much better than the contrast steel grade in the table 1.
Employing is soaked corrosion test method (TB/T 2375-1993) week steel sequence number 3 of the present invention has been carried out the corrosion resisting property test, contrasts with General Structural Steel Q345B simultaneously, and comparing result sees table 4 for details.Test-results shows that steel grade of the present invention also has significant corrosion resisting property when having increased substantially intensity, and corrosion resisting property approximately is 3 times of General Structural Steel.
Table 4 invention steel embodiment-corrosion resisting property
Steel of the present invention can be widely used in freight container, rail truck, road vehicle, tower mast rail post, engineering machinery, building iron structure or the like Application Areas.
Claims (4)
1. Yield strength 700 MPa grade atmospheric corrosion resistant steel, its Chemical Composition weight percent is:
C 0.05-0.10
Si ≤0.50
Mn 0.80～1.60
P ≤0.020
S ≤0.010
Al 0.01-0.05
Cu 0.20-0.55
Cr 0.40-0.80
Ni 0.12-0.40
Ca 0.001-0.006
N 0.001-0.006
Surplus is Fe and unavoidable impurities element.
2. Yield strength 700 MPa grade atmospheric corrosion resistant steel as claimed in claim 1 is characterized in that, also comprises Nb≤0.07, Ti≤0.18, in Mo≤0.35 at least two kinds.
3. the manufacture method of a Yield strength 700 MPa grade atmospheric corrosion resistant steel, it comprises the steps,
A) smelt, be cast into steel billet, its Chemical Composition weight percent: C:0.05-0.10 of Weather-resistant low alloy steel, Si≤0.50, Mn:0.8～1.6, P≤0.020, S≤0.010, Al:0.01-0.05, Cu:0.20-0.55, Cr:0.40-0.80, Ni:0.12-0.40, Ca:0.001-0.006, the N:0.001-0.006 surplus is Fe and unavoidable impurities element;
B) steel billet adopts the controlled rolling of two stages at reheat more than 1200 ℃, and roughing finishes the back and beginning finish rolling more than 950 ℃, and the finish rolling finishing temperature is lower than 910 ℃, and along with the increase finishing temperature of finished product thickness of slab is answered corresponding reduction;
C) be cooled to 450 ℃ to 650 ℃ with the rate of cooling of 5～15 ℃/S then and batch, the increase according to thickness of slab reduces coiling temperature too, and then air cooling is to room temperature.
4. the manufacture method of Yield strength 700 MPa grade atmospheric corrosion resistant steel as claimed in claim 3 is characterized in that, also contains Nb≤0.07, Ti≤0.18, and in Mo≤0.35 at least two kinds, by weight percentage.
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