CN102676921A - Cold-resistant high-strength hot-rolled angle steel and production method thereof - Google Patents
Cold-resistant high-strength hot-rolled angle steel and production method thereof Download PDFInfo
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Abstract
The invention relates to a cold-resistant high-strength hot-rolled angle steel and a production method thereof. The angle steel contains, by weight, 0.06%-0.20% of carbon (C), 0.20%-0.50% of silicon (Si), 1.10%-1.50% of manganese (Mn), phosphorus (p), sulphur (s), 0.030%-0.070% of vanadium(V), 0.015%-0.050% of niobium (Nb), and 0.10%-0.60% of nickel (Ni), wherein p <=0.015% and s <=0.010%. Carbon equivalent (CEV) =C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15<=0.40%. The process includes smelting, slagging, argon blowing, continuous casting, heating of casting blank, hot rolling and cooling to a room temperature. According to the cold-resistant high-strength hot-rolled angle steel and the production method thereof, requirements for a power transmission tower at -40 DEG C can be completely satisfied, the yield strength of the angle steel is larger than 550 MPa, the tensile strength of the angle steel is larger than or equal to 680 MPa, the elongation after fracture of the angle steel is larger than or equal to 24%, the Charpy impact energy at -40 DEGC is larger than or equal to 55J, and the grade of the prior austenite grain size is greater than or equal to 10 grade. The cold-resistant high-strength hot-rolled angle steel has the advantages of being high in strength, fine in grains and good in toughness, the production method can be used for producing the angle steel for an ultrahigh pressure power transmission tower, and the side width of the angle steel can be kept to be 280mm or more.
Description
Technical field
The present invention relates to a kind of shaped steel and working method thereof, specifically belong to high-strength hot-rolled angle steel of a kind of anti-severe cold and working method.
Background technology
Angle steel is mainly used in the electric power pylon construction.The electric power pylon building materials has two kinds of angle steel and pipes, and angle steel is mainly used in the DC line electric power pylon, adopts steel tube tower 1000 kilovolts and above alternating current circuit more.Use in the mountain area because electric power pylon is many, the steel tube tower complex structure, transportation of angle steel tower and easy maintenance, cost are low, take all factors into consideration factors such as transportation, maintenance, cost, and the angle steel tower uses more extensive.
China's high pressure, ultra-high voltage iron tower all adopt Two bors d's oeuveres or the four assemblies little angle steel of hem width below 200mm to combine at present; This iron tower not only cost is high; And safety performance is lower; At 235MPa～420MPa, quality grade is the B level to the iron tower that uses at present, only considers that promptly room temperature situation inferior horn steel drift hits performance with angle steel ys rank.Because the northern China aboundresources according to State Grid's development program, in firepower or the generating of wind resource abundant area, delivers power to power demand major regions such as the southeast through transmitting line.Because ground such as Xinjiang of China, northeast are very long winter; Temperature can reach-30 ℃; And north of china in winter wind-force is big, and under wind effect, the angle steel electric power pylon bears great shear forces and pulling force; Therefore be transported to southern electric power pylon from the north, need to use the oversized high-strength degree hot-rolled angle steel that does not have splicing, cold-resistant environment, stretching resistance and shear action.
A kind of Q460 level low alloy high-strength corner iron and production technique have been related among the number of patent application CN200910073968.6; This steel grade does not adopt crystal grain thinning and improves flexible element nb and Ni; Therefore it is thick to produce product grains, can't realize possessing simultaneously the characteristic of HS and H.T.; Wherein carbon equivalent (Ceq≤0.46%) is higher, and welding property is poor; This steel grade is not suitable under low temperature environment, using.
A kind of high-strength Q 420 C level steel tower corner iron and production technique are disclosed among the number of patent application CN200910073969.0, this steel grade ys >=420MPa, intensity is lower; Propose the requirement of 0 ℃ of impelling strength, be not suitable for the severe cold area under the low temperature more; Add 0.004 ~ 0.010%Ti in the steel, form the Ti inclusion easily, the intensity and the security of steel impacted.
Summary of the invention
The object of the invention overcomes that present construction electric power pylon is low with angle steel intensity, the deficiency of the shortcoming of poor toughness; Providing a kind of is under ℃ condition of temperature≤-40, in the water smoke environment at harsh climate; The ys of hot-rolled angle steel wants>=520MPa, elongation after fracture>=22%; Grain fineness number>=10 grade, and be applicable to a kind of anti-severe cold high-strength hot-rolled angle steel and the working method of angle steel hem width 280 millimeters and above big specification.
Realize the measure of above-mentioned purpose:
The high-strength hot-rolled angle steel of a kind of anti-severe cold, its component and weight percent content: C:0.06%～0.20%, Si:0.20%～0.50%; Mn:1.10%～1.50%, P≤0.015%, S≤0.010%; V:0.030%～0.070%, Nb:0.015%～0.050%, Ni:0.10%～0.60%; All the other are Fe and unavoidable impurities, and satisfy CEV=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15≤0.40%;-40 ℃ of Charpy-V impact powers are greater than 55J, ys>=550MPa.
Produce the method for the high-strength hot-rolled angle steel of a kind of anti-severe cold, its step:
1) smelts control molten steel overheat≤15 ℃; In the steel flow output is 1/4 o'clock, and the disposable set amount of pressing adds Ni;
2) carry out slag making, the basicity of control slag is 3.6～4.0;
3) carry out Argon, argon blowing time was not less than 4 minutes;
4) carry out continuous casting, the control teeming temperature is at 1530～1550 ℃, and induction stirring is even;
5) to the strand heating, Heating temperature is at 1220～1250 ℃;
6) carry out hot rolling, the control start rolling temperature is not higher than 900 ℃ of following controlled deformation amounts in temperature and is not less than 75% at 1150～1200 ℃, and finishing temperature is at 750～800 ℃;
7) be cooled to room temperature, controlled chilling speed is at 8～10 ℃/second.
The reason of C, Si, Mn, P, S, V, Nb, Ti, CEV limited amount among the present invention below is detailed:
Carbon (C): C is the principal element that improves hardness of steel, and along with the increase of carbon content, the intensity of steel improves thereupon, but the toughness of steel and weldability descend.The present invention requires angle steel should have HS that good welding property is arranged again, and the carbon content of design steel is unsuitable too high can not be too low, therefore C content target value is controlled at 0.06%～0.20%.
Silicon (Si): Si exists in ferritic or the austenite with the sosoloid form, dwindles the austenite phase region.Si can significantly improve elastic limit, the ys of steel, but Si is prone to make and forms banded structure in the steel, makes lateral performance be lower than vertical performance, so Si content is unsuitable too high to the greatest extent, therefore Si content is controlled at 0.20%～0.50%.
Manganese (Mn): the manganese solid solution is in ferritic or austenite, and manganese strengthened ferritic or austenitic effect be not as good as carbon, but when gaining in strength, to the not influence of ductility of steel.Manganese is again good reductor and sweetening agent, contains a certain amount of manganese and can eliminate or weaken the fragility that steel causes because of sulphur, thereby improve the processing characteristics of steel.But when manganese content is higher, the tendency that makes the crystalline grain of steel alligatoring is arranged, therefore Si content is controlled at 1.10%～1.50%.
S (sulphur), P (phosphorus): S, P are intensive crack sensitivity elements; The S too high levels can form a large amount of MnS, and MnS is prone to separate out at crystal boundary when solidification of molten steel; When hot rolling, being rolled into band shape is mingled with; Reduced the ductility and the toughness of steel, so S content being low more good more, S content target value is controlled at≤and 0.010%.P can improve the low temperature brittleness transition temperature, and the low temperature impact properties of steel is declined to a great extent, and therefore requires P≤0.015%.
Vanadium (V): vanadium role in steel mainly is the tissue and the crystal grain of refinement steel.Improve the grain coarsening temperature, thereby reduce the superheated susceptivity of steel, improve the intensity and the toughness of steel.When high temperature, dissolve in the hardening capacity that the Ovshinsky physical efficiency increases steel to vanadium.Vanadium has very big solubleness in austenite, almost to the not influence of thermal distortion technology, it mainly is to separate out in process of cooling, improves the reinforcement level of steel through precipitation strength.
Niobium (Nb): add Nb in the steel and can improve its ys and impelling strength, reduce brittle transition temperature.During heating, Nb can stop austenite crystal to be grown up, and adds a certain amount of Nb and can the recrystallization temperature of steel be brought up to about 950 ℃, through the controlled rolling crystal grain thinning, improves the intensity and the toughness of steel simultaneously.When Nb content greater than 0.050% the time, not only the crystal grain thinning effect is not obvious, and is prone to the inclusion of Nb in the steel, reduces the intensity and the impelling strength of steel.
Nickel (Ni): the unlimited solid solution of nickel and iron, nickel enlarges the austenitic area of iron, is the principal element that forms stable austenite.Nickel reinforced ferrite and refinement and increase perlite improve the intensity and the antifatigue power of steel of steel, reduce the susceptibility of steel to breach, the low temperature brittleness transition temperature of reduction steel.Be lower than 0.10% like its content, not obvious for the low temperature impact properties that improves this steel grade; Because the price of nickel is higher, belongs to scarce resource again, is higher than 0.60% like content, then can raise the cost and cause the waste of resource.
Carbon equivalent (CEV): carbon equivalent is low more, and the welding property of steel is good more, and angle steel need carry out a large amount of welding in being processed into the iron tower process, therefore on the basis of proof strength, reduces carbon and alloy content, control carbon equivalent ce V≤0.40%.
The present invention compared with prior art can satisfy-40 ℃ of environment electric power pylon requirements on Construction fully, and its ys is greater than 550MPa; Be up to 635MPa, tensile strength >=680MPa is up to 750MPa; Elongation after fracture >=24%;-40 ℃ of Charpy-V impact power >=55J, prior austenite grain size rank >=10 grade have the characteristics of HS, close grain, good toughness; And can prepare hem width and use angle steel at 280mm and above EHV transmission iron tower, for power sector development material selection aspect provides strong assurance.
Embodiment
Describe in detail in the face of the present invention down:
Embodiment 1
The production length of side is 280 millimeters a equal legged angle, its component and weight percent content: C:0.06%, Si:0.20%; Mn:1.50%, P:0.0148%, S:0.010%; V:0.030%, Nb:0.015%, Ni:0.60%; All the other are Fe and unavoidable impurities, and satisfy CEV=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15=0.356%≤0.40%.
Its production stage:
1) smelt, molten steel overheat is 15 ℃; In the steel flow output is 1/4 o'clock, and the disposable set amount of pressing adds Ni;
2) carry out slag making, the basicity of control slag is 3.6;
3) carry out Argon, argon blowing time is 4.5 minutes;
4) carry out continuous casting, the control teeming temperature is at 1530～1535 ℃, and induction stirring is even;
5) to the strand heating, Heating temperature is at 1220～1225 ℃;
6) carry out hot rolling, start rolling temperature is that 850 ℃ of following controlled deformation amounts are 75% at 1150～1155 ℃ in temperature, and finishing temperature is at 750～755 ℃;
7) be cooled to room temperature, controlled chilling speed is at 8 ℃/second.
Embodiment 2
The production length of side is 290 millimeters a equal legged angle, its component and weight percent content: C:0.081%, Si:0.28%; Mn:1.420%, P:0.0146%, S:0.0096%; V:0.042%, Nb:0.026%, Ni:0.22%; All the other are Fe and unavoidable impurities, and satisfy CEV=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15=0.34%≤0.40%.
Its production stage:
1) smelt, molten steel overheat is 12 ℃; In the steel flow output is 1/4 o'clock, and the disposable set amount of pressing adds Ni;
2) carry out slag making, the basicity of control slag is 3.8;
3) carry out Argon, argon blowing time is 5 minutes;
4) carry out continuous casting, the control teeming temperature is at 1540～1545 ℃, and induction stirring is even;
5) to the strand heating, Heating temperature is at 1230～1235 ℃;
6) carry out hot rolling, start rolling temperature is that 885 ℃ of following controlled deformation amounts are 78% at 1160～1165 ℃ in temperature, and finishing temperature is at 760～765 ℃;
7) be cooled to room temperature, controlled chilling speed is at 9 ℃/second.
Embodiment 3
The production length of side is 300 millimeters a equal legged angle, its component and weight percent content: C:0.11%, Si:0.36%; Mn:1.35%, P:0.0142%, S:0.009%; V:0.051%, Nb:0.033%, Ni:0.48%; All the other are Fe and unavoidable impurities, and satisfy CEV=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15=0.377%≤0.40%.
Its production stage:
The production length of side is 300 millimeters a equal legged angle,
1) smelt, molten steel overheat is 13 ℃; In the steel flow output is 1/4 o'clock, and the disposable set amount of pressing adds Ni;
2) carry out slag making, the basicity of control slag is 4.0;
3) carry out Argon, argon blowing time is 6 minutes;
4) carry out continuous casting, the control teeming temperature is at 1535～1540 ℃, and induction stirring is even;
5) to the strand heating, Heating temperature is at 1245～1250 ℃;
6) carry out hot rolling, start rolling temperature is that 895 ℃ of following controlled deformation amounts are 80% at 1172～1177 ℃ in temperature, and finishing temperature is at 785～790 ℃;
7) be cooled to room temperature, controlled chilling speed is at 10 ℃/second.
Embodiment 4
The production length of side is 280 millimeters * 125 millimeters a unequal-angle bar, its component and weight percent content: C:0.131%, Si:0.43%; Mn:1.22%, P:0.0132%, S:0.0089%; V:0.07%, Nb:0.045%, Ni:0.60%; All the other are Fe and unavoidable impurities, and satisfy CEV=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15=0.388%≤0.40%.
Its production stage:
1) smelt, molten steel overheat is 8 ℃; In the steel flow output is 1/4 o'clock, and the disposable set amount of pressing adds Ni;
2) carry out slag making, the basicity of control slag is 3.6;
3) carry out Argon, argon blowing time is 6.5 minutes;
4) carry out continuous casting, the control teeming temperature is at 1545～1550 ℃, and induction stirring is even;
5) to the strand heating, Heating temperature is at 1238～1243 ℃;
6) carry out hot rolling, start rolling temperature is that 885 ℃ of following controlled deformation amounts are 79% at 1195～1200 ℃ in temperature, and finishing temperature is at 795～800 ℃;
7) be cooled to room temperature, controlled chilling speed is at 9 ℃/second.
Embodiment 5
The production length of side is 295 millimeters a equal legged angle, its component and weight percent content: C:0.2%, Si:0.50%; Mn:1.10%, P:0.013%, S:0.009%; V:0.03%, Nb:0.05%, Ni:0.10%; All the other are Fe and unavoidable impurities, and satisfy CEV=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15=0.396≤0.40%.
Its production stage:
1) smelt, molten steel overheat is 5 ℃; In the steel flow output is 1/4 o'clock, and the disposable set amount of pressing adds Ni;
2) carry out slag making, the basicity of control slag is 3.8;
3) carry out Argon, argon blowing time is 5 minutes;
4) carry out continuous casting, the control teeming temperature is at 1535～1540 ℃, and induction stirring is even;
5) to the strand heating, Heating temperature is at 1245～1250 ℃;
6) carry out hot rolling, start rolling temperature is that 850 ℃ of following controlled deformation amounts are 81% at 1191～1196 ℃ in temperature, and finishing temperature is at 788～793 ℃;
7) be cooled to room temperature, controlled chilling speed is at 9 ℃/second.
Table 1 is the results of property statistics tabulation after above-mentioned each embodiment detects.
Results of property statistics tabulation after each embodiment of table 1 detects
Can find out that from table 1 the present invention can satisfy-40 ℃ of environment electric power pylon requirements on Construction fully, its ys is greater than 550MPa; Be up to 635MPa, tensile strength >=680MPa is up to 750MPa; Expansion and contraction >=24% of having no progeny ,-40 ℃ of Charpy-V impact power >=59J, prior austenite grain size rank >=10 grade; This steel has the characteristics of HS, close grain, good toughness; Can be applicable to the electric power pylon construction of vast severe cold area, solve China, for power sector development material selection aspect provides strong assurance at present in the difficult problem of severe cold environment electric power pylon with steel.
Claims (2)
1. high-strength hot-rolled angle steel of anti-severe cold, its component and weight percent content: C:0.06%～0.20%, Si:0.20%～0.50%; Mn:1.10%～1.50%, P≤0.015%, S≤0.010%; V:0.030%～0.070%, Nb:0.015%～0.050%, Ni:0.10%～0.60%; All the other are Fe and unavoidable impurities, and satisfy CEV=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15≤0.40%;-40 ℃ of Charpy-V impact powers are greater than 55J, ys>=550MPa.
2. the method for the high-strength hot-rolled angle steel of a kind of anti-severe cold under the production claim 1, its step:
1) smelts control molten steel overheat≤15 ℃; In the steel flow output is 1/4 o'clock, and the disposable set amount of pressing adds Ni;
2) carry out slag making, the basicity of control slag is 3.6～4.0;
3) carry out Argon, argon blowing time was not less than 4 minutes;
4) carry out continuous casting, the control teeming temperature is at 1530～1550 ℃, and induction stirring is even;
5) to the strand heating, Heating temperature is at 1220～1250 ℃;
6) carry out hot rolling, the control start rolling temperature is not higher than 900 ℃ of following controlled deformation amounts in temperature and is not less than 75% at 1150～1200 ℃, and finishing temperature is at 750～800 ℃;
7) be cooled to room temperature, controlled chilling speed is at 8～10 ℃/second.
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Cited By (10)
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| CN104087827A (en) * | 2014-07-15 | 2014-10-08 | 武汉钢铁(集团)公司 | Atmosphere-corrosion-resistant and low-temperature-impact-resistant high-specification angle steel and production method thereof |
| CN106834944A (en) * | 2017-02-10 | 2017-06-13 | 山东钢铁股份有限公司 | A kind of ocean engineering low-temperature-resistance high-toughness hot-rolled angle steel and its manufacture method |
| CN109570231A (en) * | 2018-10-16 | 2019-04-05 | 浙江鹏华新型材料有限公司 | A kind of production technology of the big specification angle steel of high-toughness high-strength |
| CN111850426A (en) * | 2020-09-02 | 2020-10-30 | 湖州南浔超盛金属制品有限公司 | Weather-resistant hot-rolled angle steel and preparation method thereof |
| CN111926262A (en) * | 2020-09-02 | 2020-11-13 | 湖州南浔超盛金属制品有限公司 | High-low temperature resistant hot-rolled angle steel and preparation method thereof |
| CN112011741A (en) * | 2020-09-02 | 2020-12-01 | 湖州南浔超盛金属制品有限公司 | Seawater corrosion resistant hot-rolled angle steel and preparation method thereof |
| CN112011737A (en) * | 2020-08-18 | 2020-12-01 | 马鞍山钢铁股份有限公司 | 390 MPa-grade-20-DEG C-resistant hot-rolled angle steel for bridge structure and production method thereof |
| CN112195415A (en) * | 2020-11-23 | 2021-01-08 | 浙江宝武钢铁有限公司 | Hot-rolled angle steel resistant to severe saline-alkali soil corrosion and preparation method thereof |
| CN112322990A (en) * | 2020-11-23 | 2021-02-05 | 浙江宝武钢铁有限公司 | Limit-resistant low-temperature hot-rolled angle steel and preparation method thereof |
| CN112609035A (en) * | 2020-12-24 | 2021-04-06 | 常州东方特钢有限公司 | Production method of cold-resistant steel for automobile structural pipe |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104087827A (en) * | 2014-07-15 | 2014-10-08 | 武汉钢铁(集团)公司 | Atmosphere-corrosion-resistant and low-temperature-impact-resistant high-specification angle steel and production method thereof |
| CN106834944A (en) * | 2017-02-10 | 2017-06-13 | 山东钢铁股份有限公司 | A kind of ocean engineering low-temperature-resistance high-toughness hot-rolled angle steel and its manufacture method |
| CN109570231A (en) * | 2018-10-16 | 2019-04-05 | 浙江鹏华新型材料有限公司 | A kind of production technology of the big specification angle steel of high-toughness high-strength |
| CN112011737A (en) * | 2020-08-18 | 2020-12-01 | 马鞍山钢铁股份有限公司 | 390 MPa-grade-20-DEG C-resistant hot-rolled angle steel for bridge structure and production method thereof |
| CN112011737B (en) * | 2020-08-18 | 2021-10-15 | 马鞍山钢铁股份有限公司 | 390 MPa-grade-20-DEG C-resistant hot-rolled angle steel for bridge structure and production method thereof |
| CN111850426A (en) * | 2020-09-02 | 2020-10-30 | 湖州南浔超盛金属制品有限公司 | Weather-resistant hot-rolled angle steel and preparation method thereof |
| CN111926262A (en) * | 2020-09-02 | 2020-11-13 | 湖州南浔超盛金属制品有限公司 | High-low temperature resistant hot-rolled angle steel and preparation method thereof |
| CN112011741A (en) * | 2020-09-02 | 2020-12-01 | 湖州南浔超盛金属制品有限公司 | Seawater corrosion resistant hot-rolled angle steel and preparation method thereof |
| CN112195415A (en) * | 2020-11-23 | 2021-01-08 | 浙江宝武钢铁有限公司 | Hot-rolled angle steel resistant to severe saline-alkali soil corrosion and preparation method thereof |
| CN112322990A (en) * | 2020-11-23 | 2021-02-05 | 浙江宝武钢铁有限公司 | Limit-resistant low-temperature hot-rolled angle steel and preparation method thereof |
| CN112609035A (en) * | 2020-12-24 | 2021-04-06 | 常州东方特钢有限公司 | Production method of cold-resistant steel for automobile structural pipe |
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