CN1338528A - Unmodified high-toughness low-temp steel for high-energy line welding and its production method - Google Patents
Unmodified high-toughness low-temp steel for high-energy line welding and its production method Download PDFInfo
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Abstract
A high-toughness low-temp steel for high-energy linear welding contains C, Si, Mn, P, S, Al, Ti, N, B, Fe, and one or more of Cu, Ni, Nb, V, Mo and RE. The compound Ti-B oxide is used to obtain high welding performance under high linear energy (greater than 50 KJ/cm). Its low content of C and impurities can improve its toughness. Its advantags are high weld performance and low-temp toughness, and low cost. It is suitable for low-temp spherical tank and large containers.
Description
[technical field]
The present invention relates to a kind of unmodified high-toughness low-temp steel for high-energy line welding and production method thereof, belong to low alloy steel and make the field.
[background technology]
Before the present invention, patent (JP2837732 JP03264614) " hot continuously cast material has special chemical ingredients; cool off with particular speed; the high-ductility steel of reheat before rolling " just like the nineteen ninety NIPPON of Nippon Steel Corporation STEELCORP (YAWA) application, during chemical ingredients requires, Ni:0.2～1.5%, Cu:0.2～1.5%, and satisfy Mn/6+ (Cu+Ni)/15=0.28～0.40%, B * 10000+Nb * 1000=4～10, Ti/N=2.0～4.0, the hot-cast base in the time of 1000～600 ℃, speed of cooling≤5 ℃/min, Heating temperature≤1150 before rolling ℃.Its chemical ingredients requires extremely tight, and strand speed of cooling and slab heating temperature are also proposed harsh requirement, thereby cooling conditions and rolling power are had relatively high expectations, difficult aborning the realization.Again just like the patent (JP05279789) " the ultra-large linear energy input welding high tenacity low-temperature structural steel that contains C, Si, Mn, P, S, B, Ti, Al " of the NIPPON STEEL CORP of Nippon Steel Corporation (YAWA) in 1992 application, adopt the design of B-Ti-Al-N set member, make in the steel TiN size of particles very tiny, obtain Chinese People's Anti-Japanese Military and Political College's heat input welding property.It is very strict that this patent weak point is that controlling of production process requires, thereby lumber recovery is very low, and production cost is very high.
[summary of the invention]
The purpose of this invention is to provide a kind of new unmodified high-toughness low-temp steel for high-energy line welding and production method thereof, can overcome the deficiency of above-mentioned technology, make it can bear the large-line energy welding, improve the operating efficiency and the safe reliability of engineering structure, can simplify production technique again, reduce production costs, be fit to big production operation.
For achieving the above object, the present invention has designed a kind of unmodified high-toughness low-temp steel for high-energy line welding, the chemical ingredients (% by weight) that it is characterized in that steel is: C 0.02～0.18, Si 0.10～0.60, Mn 0.60～1.80, P≤0.020, S≤0.010, Al≤0.060, Ti0.005～0.025, N 0.0020～0.0050, B 0.0005～0.0030, contain Ni≤0.60 in addition, Nb≤0.040, V≤0.080, Cu≤0.80, Mo≤0.50, in RE≤0.0060 one or more, surplus is Fe, and satisfies B-0.435 * (N-Ti/3.4)≤0.0005.
The reason of C, Si, Mn, P, S, Al, Ti, N, B, Ni, Nb, V, Cu, Mo, RE limited amount among the present invention below is described in detail in detail.
C exists with interstitial atom in steel, can improve steel strength very effectively, so lower limit is 0.02%; Consider to the objective of the invention is to make the high tenacity low-temperature steel, must take into account the weldability of steel, thereby wish that C content is low, so the upper limit is 0.18%.
Si adds for liquid steel pre-deoxidizing, but for sclerosis and the toughness that prevents welded heat affecting zone (hereinafter to be referred as HAZ) reduces, so its content range is 0.10～0.60%.
Mn is as improving steel strength and flexible composition, and adding is necessary more than 0.6%; And reason such as steel sclerosis reduces HAZ toughness during too high levels, so the upper limit is 1.80%.
P content is few more good more, needs very big cost but P content is reduced, so the upper limit is 0.020%.
The S too high levels then makes steel have anisotropy and toughness reduces, so the upper limit is 0.010%.
Al is the main deoxidant element in the steel, and the crystal grain that certain Al content can also the refinement steel improves the intensity and the toughness of steel.If but Al content is higher, can not obtain the oxide compound of Ti during with the Ti deoxidation, the oxide compound of Ti has decisive influence to Chinese People's Anti-Japanese Military and Political College's heat input welding property of steel, and the content of Al should be controlled at below 0.060% for this reason.
Ti is a kind of intensive carbide and nitride forming element, TiN, the Ti particles such as (CN) that forms is highly stable, and pinning γ crystal boundary stops the γ grain growth effectively, thereby play the effect of crystal grain thinning, it can significantly improve the toughness of room temperature strength, hot strength and the steel of steel.Simultaneously, the second phase particle TiN, the Ti (CN) etc. that Ti forms can stop the grain growth of coarse grain zone in the large-line energy welding process, make grain refining, improve the low-temperature flexibility of steel.For the oxide compound that generates Ti and the nitride of Ti, 0.005% is lower limit when adding Ti; Addition is crossed and is generated carbide (TiC) at most, toughness is reduced, so the upper limit is preferably 0.025%.
N is necessary to the generation of TiN precipitate and B precipitate, so lower limit is 0.0020%; The increase of solid solution N causes HAZ toughness to reduce, thus on be limited to 0.0050%.
B is a surface active element, and is poly-very easily partially to crystal boundary, suppresses the forming core of proeutectoid ferrite effectively and grows up strongly inhibited γ-α phase transformation, the intensity of raising steel; The interaction of B and N can obviously improve the low-temperature flexibility of steel.Easily form carbide and the nitride of B during the B too high levels, and be collected at original austenite crystal prevention, impelling in the neighbourhood, dislocation desity increases, can be used as the trap of hydrogen in partial area, thereby impel the crystal boundary cracking takes place herein, therefore, B content is chosen in 0.0005～0.0030%.
Also contain among Ni, Nb, V, Cu, Mo, the RE one or more among the present invention.
Ni can strengthen matrix effectively as substitutional atom in steel, can increase interatomic bonding force, improves the low-temperature flexibility of steel significantly, but too high levels easily causes steel plate oxide skin to be difficult to come off, so the upper limit is controlled at 0.60%.
Nb is a kind of strong carbide forming element, forms NbC, Nb (CN) grade in an imperial examination two-phase particle in steel, can stop growing up of austenite crystal, crystal grain thinning, the toughness of raising steel.Stop the slippage of dislocation simultaneously and climb the intensity of raising steel.But too high levels easily produces intergranular crack, so its content is controlled at below 0.040%.
V also is a kind of strong carbide forming element, the VC that in steel, forms, V (CN) grade in an imperial examination two-phase particle, and the energy crystal grain thinning, the pinning dislocation, the obdurability of raising steel, particularly with the Nb complex intensifying, effect is better.But during too high levels, reduce the weldability of steel, so its content is limited in below 0.080%.
Cu mainly plays the precipitation strength effect in steel, help obtaining good low-temperature flexibility in addition, improves the antifatigue crack propagation ability of steel.During the Cu too high levels, HAZ toughness reduces, and very easily produces check crack in the steel plate rolling process, so the upper limit is 0.80%.
Mo can improve particularly hot strength of steel strength, and it also is the one of the chief elements that strengthens steel anti-hydrogen embrittlement ability simultaneously.But add the hardenability that excessive Mo has increased steel, unfavorable to the weldability of steel, so the upper limit of Mo is controlled at 0.50%.
RE can improve the form and the distribution of inclusion in the steel, helps improving the low-temperature flexibility of steel.But the oxidisability of RE is very strong, and the RE compound that forms when content is high is totally unfavorable to the performance of steel, thus its content range be chosen in≤0.0060%.
The production method of steel of the present invention, adopt the desulfurizing iron technology, the converter top and bottom blowing, vacuum depths reason and trimming, by common ultra-clean steel technology be rolled, thermal treatment, it is characterized in that: the start rolling temperature of steel 〉=1180 ℃, controlled rolling accumulative total draft 〉=68%, end three roads every time draft 〉=12%, finishing temperature≤870 ℃; Adopt normalizing or normalizing+temper, normalizing temperature is 890～950 ℃, and soaking time is: 25～35 minutes+thickness of slab (mm) * 1 minute/mm; 590～670 ℃ of tempering temperatures, soaking time are 40～50 minutes+thickness of slab (mm) * 1 minute/mm.
Steel of the present invention has following advantage:
1. steel of the present invention adopts non-tempering process production, has simplified production technique, has improved lumber recovery, has reduced cost, adapts to big production requirement.
2. steel of the present invention can bear the large-line energy welding, thereby has increased substantially the welding efficiency and the construction speed of product.
3. (under 50～100kJ/cm) welding conditionss, HAZ has good obdurability, thereby has guaranteed the safe reliability of product at large-line energy.
[embodiment]
Embodiment 1: according to composition of steel requirement of the present invention, smelted three batches of steel of the present invention at vacuum induction furnace, steel ingot has been heated to 1280 ℃ comes out of the stove rollingly, start rolling temperature is respectively 1180 ℃, 1200 ℃, 1220 ℃, accumulative total draft 68～75%, finishing temperature is respectively 830,850,870 ℃.Rolled sheet material thickness difference 16,20,24mm.Normalizing temperature is respectively 890,920,950 ℃, and the normalizing soaking time was respectively 46,50,54 minutes; Tempering temperature is respectively 590,630,670 ℃, tempering insulation time was respectively 56,60,64 minutes, subsequently three kinds of steel plates have been carried out mechanical property test, tested-50 ℃ of steel plate impelling strength and the welding of the 60kJ/cm large-line energy impelling strength of-50 ℃ of HAZ afterwards, and contrast with corresponding comparative steel, data see Table 1.
-50 ℃ impelling strength and compared steel are in same level before steel of the present invention and the compared steel welding heat simulation test, but after 60kJ/cm large-line energy welding, and the HAZ impelling strength of steel of the present invention-50 ℃ is higher than compared steel far away.
As seen from Table 1, steel of the present invention adopts the composite oxides of Ti-B to obtain Chinese People's Anti-Japanese Military and Political College's heat input (〉=50kJ/cm) welding property in composition design, by reducing carbon and special microalloying, improve the purity of steel simultaneously, thereby guarantee the low-temperature flexibility that steel of the present invention is good.Steel of the present invention is delivered goods with non-quality adjustment condition, and production technique is simple, and steel product cost is cheap, all can implement at each smelter; And can improve the welding efficiency of large-scale steel structure greatly, reduce manufacturing cost.
The chemical ingredients of table 1 invention steel and compared steel and the contrast of HAZ impelling strength
| Invention steel 1 | Comparative steel | Invention steel 2 | Comparative steel | Invention steel 3 | Comparative steel | ||
| Composition | ????C | ????0.15 | ????0.13 | ????0.12 | ????0.14 | ????0.13 | ????0.15 |
| ????Si | ????0.27 | ????0.28 | ????0.225 | ????0.27 | ????0.21 | ????0.31 | |
| ????Mn | ????1.39 | ????1.37 | ????1.17 | ????1.33 | ????1.45 | ????1.36 | |
| ????P | ????0.014 | ????0.012 | ????0.012 | ????0.013 | ????0.013 | ????0.012 | |
| ????S | ????0.010 | ????0.008 | ????0.008 | ????0.009 | ????0.007 | ????0.009 | |
| ????Ti | ????0.008 | ????- | ????0.023 | ????- | ????0.015 | ????- | |
| ????B | ????0.0007 | ????- | ????0.0021 | ????- | ????0.0026 | ????- | |
| ????Al | ????0.028 | ????0.025 | ????0.039 | ????0.035 | ????0.037 | ????0.029 | |
| ????N | ????0.0034 | ????0.0038 | ????0.0041 | ????0.0042 | ????0.0037 | ????0.0040 | |
| ????Ni | ????0.34 | ????0.27 | ????0.31 | ????0.24 | ????0.29 | ????0.22 | |
| ????Nb | ????0.014 | ????- | ????0.021 | ????- | ????0.024 | ????- | |
| ????V | ????0.026 | ????- | ????- | ????- | ????0.023 | ????- | |
| ????Cu | ????0.16 | ????- | ????0.15 | ????0.14 | ????0.13 | ????- | |
| ????Mo | ????0.1026 | ????0.10 | ????0.21 | ????- | ????0.39 | ????0.10 | |
| ????RE | ????0.0022 | ????- | ????- | ????- | ????0.0044 | ????0.0035 | |
| Steel plate toughness (J) | ????138 | ????125 | ????97 | ????83 | ????91 | ????86 | |
| HAZ toughness (J) | ????97 | ????8 | ????75 | ????11 | ????91 | ????13 | |
Annotate: the impelling strength of HAZ when the impelling strength of steel plate when steel plate toughness is-50 ℃, HAZ toughness are welded back-50 ℃ for the 60kJ/cm large-line energy.
Steel of the present invention is suitable as the engineering machinery steel that low temperature spherical tank, storage tank, other large-scale low-temperature containers and extremely frigid zones use most.
Claims (2)
1. unmodified high-toughness low-temp steel for high-energy line welding, the chemical ingredients (% by weight) that it is characterized in that steel is: C 0.02～0.18, Si 0.10～0.60, Mn 0.60～1.80, P≤0.020, S≤0.010, Al≤0.060, Ti 0.005～0.025, N 0.00200～0.0050, and B 0.0005～0.0030, contains in Ni≤0.60, Nb≤0.040, V≤0.080, Cu≤0.80, Mo≤0.50, RE≤0.0060 one or more in addition, surplus is Fe, and satisfies B-0.435 * (N-Ti/3.4)≤0.0005.
2. the production method of a unmodified high-toughness low-temp steel for high-energy line welding, adopt the desulfurizing iron technology, the converter top and bottom blowing, vacuum depths reason and trimming, by common ultra-clean steel technology be rolled, thermal treatment, it is characterized in that: the start rolling temperature of steel 〉=1180 ℃, controlled rolling accumulative total draft 〉=68%, end three roads every time draft 〉=12%, finishing temperature≤870 ℃; Adopt normalizing or normalizing+temper, normalizing temperature is 890～950 ℃, and soaking time is: 25～35 minutes+thickness of slab (mm) * 1 minute/mm; 590～670 ℃ of tempering temperatures, soaking time are 40～50 minutes+thickness of slab (mm) * 1 minute/mm.
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| CN01128316A CN1116430C (en) | 2001-08-06 | 2001-08-06 | Unmodified high-toughness low-temp steel for high-energy line welding and its production method |
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| CN1116430C CN1116430C (en) | 2003-07-30 |
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| CN100406607C (en) * | 2004-11-30 | 2008-07-30 | 宝山钢铁股份有限公司 | Low yield ratio easy welding structure steel thick plate and its producing method |
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