CN101338401A - High strength weathering steel and producing method thereof - Google Patents
High strength weathering steel and producing method thereof Download PDFInfo
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- CN101338401A CN101338401A CNA2008103042956A CN200810304295A CN101338401A CN 101338401 A CN101338401 A CN 101338401A CN A2008103042956 A CNA2008103042956 A CN A2008103042956A CN 200810304295 A CN200810304295 A CN 200810304295A CN 101338401 A CN101338401 A CN 101338401A
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Abstract
The invention relates to a high-intensity anti-atmosphere corrosion steel and a production method thereof and belongs to the field of metallurgy. The technical problem needed to be solved by the invention is to provide a V-Ti-N-Nb micro-alloy high-intensity anti-atmosphere corrosion steel which has an easily-controlled hot rolling technique and has an obvious yield point. The weight percentages of the chemical components of the high-intensity anti-atmosphere corrosion steel of the invention are: equal to or less than 0.12 percent of C, equal to or less than 0.75 percent of Si, equal to or less than 1.50 percent of Mn, equal to or less than 0.025 percent of P, equal to or less than 0.008 percent of S, 0.30 to 1.25 percent of Cr, 0.12 to 0.65 percent of Ni, 0.20 to 0.55 percent of Cu, 0.006 to 0.02 percent of Ti, 0.04 to 0.09 percent of V, 0.01 to 0.02 percent of N, 0.015 to 0.03 percent of Nb and the rest is Fe and unavoidable impurities. The high-intensity anti-atmosphere corrosion steel of the invention can be used for producing the mechanical devices and parts that need to be exposed in the air.
Description
Technical field
The present invention relates to high-strength weather resisting steel and production method thereof, belong to field of metallurgy.
Background technology
The solidity to corrosion of weather resisting steel is different with the non-corrosive metal mechanism of action; be to shield by the rusty scale that the plain carbon stool surface generates; and copper, phosphorus, chromium, nickel are the effective elements of the raising steel atmospheric corrosion resistance of generally acknowledging always, and the most representative steel grade has the Cu-P-Cr-Ni series of high-weatherability and the Cu-Cr-Ni series that welded construction is used.Wherein, table 1 is the conventional ingredient requirement of Cu-Cr-Ni series weather resisting steel.
Table 1 chemical ingredients scope (weight percent)
At present, " build up " technology such as acicular ferrite, ULCB and " superfine crystal particle " technology all can make the yield strength of weather resisting steel reach the 500MPa level, but economy, feasible method still are " microalloying " technology the most.
Microalloying route based on Nb biases toward build up, has that hot rolling load is heavy, hot rolling technology control difficulty is big, shortcomings such as no remarkable yield point phenomenon appear in the stress-strain(ed) curve of the tension test of steel easily.
Up to the present, do not see have hot rolling technology to control simply, have the relevant report of the V-Ti-N-Nb microalloy high-strength weather resisting steel of sharp yield point.
Summary of the invention
First technical problem to be solved by this invention provides the V-Ti-N-Nb microalloy high-strength weather resisting steel that a kind of hot rolling technology control is simple, have sharp yield point.
High-strength weather resisting steel of the present invention, the weight percent of its chemical ingredients is: C :≤0.12%, Si :≤0.75%, Mn :≤1.50%, P :≤0.025%, S :≤0.008%, Cr:0.30～1.25%, Ni:0.12～0.65%, Cu:0.20～0.55%, Ti:0.006～0.02%, V:0.04～0.09%, N:0.01～0.02%, Nb:0.015～0.03%, surplus is Fe and unavoidable impurities.
Wherein, the yield strength 〉=500MPa of above-mentioned high-strength weather resisting steel.
Wherein, above-mentioned high-strength weather resisting steel, its tensile strength 〉=600MPa.
Wherein, above-mentioned high-strength weather resisting steel, its unit elongation 〉=20%.
Wherein, above-mentioned high-strength weather resisting steel, the ballistic work 〉=60J in the time of its-40 ℃.
Second technical problem to be solved by this invention provides a kind of production method of above-mentioned high-strength weather resisting steel.
The production method of high-strength weather resisting steel of the present invention, its processing step is basic identical with existing high-strength hot-rolled strip process step, comprise heating, hot rolling, laminar flow cooling, batch step, wherein, temperature in the heating steps is 1230～1260 ℃, finishing temperature in the hot-rolled step is 830～870 ℃, and the temperature of batching in the step is 580～620 ℃.
In the heating phase, in order to obtain high austenite solid solution nitrogen content, solid solution content of niobium and tiny austenite crystal, the Heating temperature in the described heating steps is 1230～1260 ℃.
Finishing temperature in the described hot-rolled step is 830～870 ℃, can avoid occurring mixed crystal, and is favourable to further crystal grain thinning.
When coiling temperature is lower than 580 ℃ of left and right sides, occur abnormal structures such as bainite easily, and the carbonitride of niobium (vanadium) is separated out difficulty.Therefore, the described coiling temperature that batches in the step is 580～620 ℃.
Beneficial effect of the present invention is: by vanadium, titanium, nitrogen, content of niobium and the hot rolling technology (hot-rolled temperature) in the control steel billet, make weather resisting steel have high strength, high tenacity, high-ductility, excellent comprehensive performances such as tangible yield-point arranged, and have that hot rolling technology control difficulty is little, workable, method simple, suitable wide popularization and application and low cost and other advantages.
Embodiment
Below in conjunction with embodiment the specific embodiment of the present invention is further described.
The production and the performance measurement of embodiment 1 high-strength weather resisting steel of the present invention
Adopt 120 tons of LD converters and 1450 hot continuous rolling units (6 frame) production yield strength 500MPa grade high-strength weather resisting steel Q500NQR1, its production process is: steel billet → heating → hot rolling → laminar flow cools off → batches, the content of V, N, Ti, Nb is respectively in the steel billet: V:0.06%, N:0.0136%, Ti:0.009%, Nb:0.021%, Heating temperature in its heating steps is 1247 ℃, finishing temperature in the hot-rolled step is 857 ℃, and the temperature of batching in the step is 601 ℃.
After measured, the performance of the high-strength weather resisting steel of production is as follows: yield strength, tensile strength, unit elongation and low-temperature impact work are respectively 555MPa (sharp yield point is arranged), 635MPa, 25% and 163J (3/4 size.The standard size of ballistic work is 10mm * 10mm * 55mm, but when steel plate thickness during less than 10mm, stipulates the sample of available 7.5mm * 10mm * 55mm and 5.0mm * 10mm * 55mm, and they are called 3/4 size and half-size scale respectively for short).
The production and the performance measurement of embodiment 2 high-strength weather resisting steels of the present invention
Adopt 120 tons of LD converters and 1450 hot continuous rolling units (6 frame) production yield strength 500MPa grade high-strength weather resisting steel Q500NQR1, its production process is: steel billet → heating → hot rolling → laminar flow cools off → batches, the content of V, N, Ti, Nb is respectively in the steel billet: V:0.06%, N:0.0136%, Ti:0.009%, Nb:0.021%, Heating temperature in its heating steps is 1230 ℃, finishing temperature in the hot-rolled step is 852 ℃, and the temperature of batching in the step is 605 ℃.
After measured, the performance of the high-strength weather resisting steel of production is as follows: yield strength, tensile strength, unit elongation and low-temperature impact work are respectively 540MPa (sharp yield point is arranged), 610MPa, 25% and 198J (3/4 size).
The production and the performance measurement of embodiment 3 high-strength weather resisting steels of the present invention
Adopt 120 tons of LD converters and 1450 hot continuous rolling units (6 frame) production yield strength 500MPa grade high-strength weather resisting steel Q500NQR1, its production process is: steel billet → heating → hot rolling → laminar flow cools off → batches, the content of V, N, Ti, Nb is respectively in the steel billet: V:0.07%, N:0.0152%, Ti:0.013%, Nb:0.029%, Heating temperature in its heating steps is 1230 ℃, finishing temperature in the hot-rolled step is 868 ℃, and the temperature of batching in the step is 597 ℃.
After measured, the performance of the high-strength weather resisting steel of production is as follows: yield strength, tensile strength, unit elongation and low-temperature impact work are respectively 525MPa (sharp yield point is arranged), 620MPa, 26% and 170J (3/4 size).
From embodiment 1,2,3 as can be seen, high-strength weather resisting steel of the present invention, its yield strength can reach more than the 500MPa, and has sharp yield point, and its tensile strength can reach more than the 600MPa, and its low-temperature impact work can reach more than the 150J.
Claims (6)
1. high-strength weather resisting steel, it is characterized in that: the weight percent of its chemical ingredients is: C :≤0.12%, Si :≤0.75%, Mn :≤1.50%, P :≤0.025%, S :≤0.008%, Cr:0.30～1.25%, Ni:0.12～0.65%, Cu:0.20～0.55%, Ti:0.006～0.02%, V:0.04～0.09%, N:0.01～0.02%, Nb:0.015～0.03%, surplus is Fe and unavoidable impurities.
2. high-strength weather resisting steel according to claim 1 is characterized in that: its yield strength 〉=500MPa.
3. high-strength weather resisting steel according to claim 1 is characterized in that: its tensile strength 〉=600MPa.
4. high-strength weather resisting steel according to claim 1 is characterized in that: its unit elongation 〉=20%.
5. high-strength weather resisting steel according to claim 1 is characterized in that: the ballistic work 〉=60J in the time of its-40 ℃.
6. the production method of each described high-strength weather resisting steel of claim 1～5, comprise heating, hot rolling, laminar flow cooling, batch step, it is characterized in that: the temperature in the heating steps is 1230～1260 ℃, finishing temperature in the hot-rolled step is 830～870 ℃, and the temperature of batching in the step is 580～620 ℃.
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| CN200810304295A CN100580123C (en) | 2008-08-29 | 2008-08-29 | High strength anti-weathering steel and producing method thereof |
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| CN200810304295A CN100580123C (en) | 2008-08-29 | 2008-08-29 | High strength anti-weathering steel and producing method thereof |
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| CN101338401A true CN101338401A (en) | 2009-01-07 |
| CN100580123C CN100580123C (en) | 2010-01-13 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106350735A (en) * | 2016-11-16 | 2017-01-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Thick-gauge Q450NQR1 steel plate and rough rolling method thereof |
| CN107502835A (en) * | 2017-08-17 | 2017-12-22 | 北京国网富达科技发展有限责任公司 | A kind of weather-proof angle steel of steel tower high-strength and high ductility and preparation method thereof |
| CN108774711A (en) * | 2018-06-05 | 2018-11-09 | 马鞍山钢铁股份有限公司 | A kind of armored concrete economical 500MPa grades of seawater corrosion resistance reinforcing bar and its production method |
| CN109234631A (en) * | 2018-10-26 | 2019-01-18 | 山西太钢不锈钢股份有限公司 | A kind of low temperature resistant stainless steel and preparation method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE516583C2 (en) * | 1997-12-05 | 2002-01-29 | Sandvik Ab | Austenitic stainless steel with good oxidation resistance |
| CN1084798C (en) * | 1999-05-31 | 2002-05-15 | 宝山钢铁股份有限公司 | Method for producing high toughness, high wear resistant steel of slurry pipeline |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106350735A (en) * | 2016-11-16 | 2017-01-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Thick-gauge Q450NQR1 steel plate and rough rolling method thereof |
| CN106350735B (en) * | 2016-11-16 | 2018-03-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Think gauge Q450NQR1 steel plates and its roughing method |
| CN107502835A (en) * | 2017-08-17 | 2017-12-22 | 北京国网富达科技发展有限责任公司 | A kind of weather-proof angle steel of steel tower high-strength and high ductility and preparation method thereof |
| CN108774711A (en) * | 2018-06-05 | 2018-11-09 | 马鞍山钢铁股份有限公司 | A kind of armored concrete economical 500MPa grades of seawater corrosion resistance reinforcing bar and its production method |
| CN108774711B (en) * | 2018-06-05 | 2019-10-01 | 马鞍山钢铁股份有限公司 | A kind of armored concrete economical 500MPa grades of seawater corrosion resistance reinforcing bar and its production method |
| CN109234631A (en) * | 2018-10-26 | 2019-01-18 | 山西太钢不锈钢股份有限公司 | A kind of low temperature resistant stainless steel and preparation method thereof |
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| CN100580123C (en) | 2010-01-13 |
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Address after: 611731 No. 1 Tianlong Road, hi tech West District, Sichuan, Chengdu Co-patentee after: Pangang Group Panzhihua Iron & Steel Research Institute Co., Ltd. Patentee after: Pangang Group Institute Co., Ltd. Co-patentee after: Pangang Group Steel Vanadium & Titanium Co., Ltd. Address before: 611731 No. 1 Tianlong Road, hi tech West District, Sichuan, Chengdu Co-patentee before: Pangang Group Panzhihua Iron & Steel Research Institute Co., Ltd. Patentee before: Pangang Group Institute Co., Ltd. Co-patentee before: Panzhihua New Steel & Vanadium Co., Ltd. |
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Granted publication date: 20100113 Termination date: 20160829 |
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