CN105063493A - Thick X65 pipeline steel and production method thereof - Google Patents
Thick X65 pipeline steel and production method thereof Download PDFInfo
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Abstract
The invention relates to a hot continuous rolling steel belt and a production method thereof, in particular to thick X65 pipeline steel and a production method thereof. The thick X65 pipeline steel is low in cost and can maintain good strength, toughness and drop weight tear performance. According to the technical scheme, the chemical components of the thick X65 pipeline steel comprise, in percentage by weight, 0.07%-0.10% of C, 0.10%-0.30% of Si, 1.40%-1.60% of Mn, 0.020% or less of P, 0.010% or less of S, 0.030%-0.039% of Nb, 0.06%-0.08% of V, 0.008%-0.019% of Ti, 0.15%-0.30% of Cr and the balance Fe and unavoidable impurities. According to the thick X65 pipeline steel and the production method thereof, addition of expensive Mo, Ni and other elements is not needed, the finish rolling inlet temperature of the thick X65 pipeline steel does not need to be lowered substantially, the cost is relatively low, the rolling technology is simple, and operability is high. In addition, the yield strength of the 12mm-17mm thick X65 pipeline steel is 480-518 MPa, the tensile strength of the 12mm-17mm thick X65 pipeline steel is 560-660 MPa, the impact energy at 20 DEG C below zero is 190 J or more, and the drop weight tear area at 20 DEG C below zero is larger than 94%.
Description
Technical field
The present invention relates to hot continuous rolling steel band and production method thereof, particularly relate to a kind of think gauge X65 pipe line steel and production method thereof.
Background technology
In railway, highway, aviation, water transport and pipeline 5 kinds of mode of transport, pipeline transportation is the mode of transport of a kind of economy, continuous safe, with Cemented filling oil and gas have efficiently, economical, safety, free of contamination feature, be the most effective instrument of conveying oil gas.Along with the develop rapidly of pipework, what driven pipe line steel to produce develops rapidly.
Oil, natural gas transmission pipeline are divided into long-distance transport pipes and infield gathering line two portions.Long-distance transport pipes are in order to improve transport efficiency, and trunk main transfer pressure is higher, require to select other steel grade of higher intensity level, as X70, X80 rank; The pipeline delivery pressure that gathering line, branch line and some throughput rates are less is lower, generally selects the steel grade that intensity is lower, and X65 level pipeline pipeline steel is the steel grade that branch line engineering is commonly used.
Pipe line steel over-all properties requires high, and require that to have intensity high, toughness is high, and ductile-brittle transition temperature is low, good welding performance etc., particularly represents that DWTT (Drop-Weight Tear Test (DWTT)) performance requriements of crack arrest characteristic is strict.DWTT (Drop-Weight Tear Test (DWTT)) performance is the index of the important indispensability of of steel for gas delivering pipeline specification of quality, DWTT adopts full thickness sample, more conventional shock test more can truly, the fracture toughness property of accurate response material, DWTT is extremely responsive to the thickness of steel, thickness of steel product increases, and its homogeneity of structure reduces, DWTT penalty, therefore, improving think gauge pipeline steel block hammer performance is key issue urgently to be resolved hurrily in think gauge pipe line steel batch production process.
In a kind of X65 pipe line steel disclosed in patent CN101928883A and production method thereof, its chemical composition: C:0.055-0.09%, Si:0.15-0.35%, Mn:1.50-1.65%, P :≤0.020%, S :≤0.005%, Nb:0.040-0.055%, V:0.040-0.070%, Ti:0.010-0.025%, Als:0.005-0.060%.In its chemical composition, Nb content is high, and its alloying constituent is higher.This patent is compact at Stand Mill is that steckel rolling system is produced, its steel billet time delay 40-60 second after roughing, roughing steel billet temperature is made to carry out the continuous finish rolling of 3 passage lower than 900 DEG C, finishing temperature 790-830 DEG C, ensure its block hammer performance by significantly reducing entry temperature at finishing, this invention is not suitable for hot continuous rolling and produces.
In the method for a kind of producing X 65 pipe steel with low cost disclosed in patent CN101082106A, its chemical composition: C:0.046-0.60%, Si:0.15-0.30%, Mn:1.40-1.60%, P:0.006-0.015%, S:0.001-0.008%, Nb:0.045-0.050%, Ti:0.015-0.025%, this invention carbon content is low, and in employing, carbon alloy carries out alloying, its carbon content will exceed standard, low-carbon alloy can only be adopted to carry out alloying, and its Nb content is higher simultaneously, and alloying cost is higher.Add a certain amount of Ti, adopt the precipitation strength of Ti to ensure its intensity, but titanium micro-alloyed steel requires high to process for making, the fluctuation of nitrogen content and oxygen level will cause the fluctuation of end properties.In addition, CSP unit is produced, the X65 pipe line steel of below thickness 10.0mm can only be produced, be not suitable for producing think gauge X65 pipe line steel.
In X 65 pipeline steel for use in acid condition disclosed in patent CN1811002A and manufacture method thereof, its chemical composition: C:0.02-0.05%, Si:0.10-0.50%, Mn:1.20-1.50%, P:0.004-0.012%, S :≤0.002%, Nb:0.05-0.07%, Ti:0.005-0.025%, Mo:0.050-0.195%, add a certain amount of Cu and Ni.By significantly reducing its P, S content, its Nb content is higher simultaneously, and add again the elements such as expensive Mo, Cu, Ni and ensure its block hammer performance, its production cost is high.
In a kind of method improved compared with think gauge X60 pipeline steel block hammer performance disclosed in patent CN103388110A, control C≤0.12 of chemical composition, Si≤0.40, Mn≤1.60, P≤0.025 and S≤0.015, and meet following condition: (1) is also added with Nb, V, Ti or the combination between them, Nb, V and Ti content sum≤0.15%; (2) also add and have Cr, Mo, Ni and Cu or the combination between them, the value of (3) ∑ Mn must meet between 1.80 ~ 2.05, and have Cr, Mo, Ni and Cu or the combination between them in the chemical composition of this invention, its production cost is high.
When not affecting its intensity, toughness and drop weight tearing performance, if the cost of think gauge X65 pipe line steel can be reduced further, it is the further target that those skilled in the art pursue.
Summary of the invention
The object of this invention is to provide a kind of cost low, and the think gauge X60 pipe line steel that intensity, toughness, drop weight tearing performance etc. can be kept good.
The technical scheme that technical solution problem of the present invention adopts is: think gauge X65 pipe line steel, its chemical composition consists of by weight percentage: C:0.07-0.10%, Si:0.10-0.30%, Mn:1.40-1.60%, P :≤0.020%, S :≤0.010%, Nb:0.030-0.039%, V:0.06-0.08%, Ti:0.008-0.019%, Cr:0.15-0.30%, all the other are Fe and inevitable impurity.
Preferred scheme is: C:0.07-0.09%, Si:0.15-0.25%, Mn:1.45-1.55%, P :≤0.018%, S :≤0.005%, Nb:0.035-0.039%, V:0.06-0.08%, Ti:0.010-0.017%, Cr:0.20-0.30%, all the other are Fe and inevitable impurity.
The production technique of think gauge X65 pipe line steel of the present invention is hot continuous rolling production technique: after the concise slag desulfurization → stove of desulfurizing iron → converter smelting top-bottom blowing → deoxidation, alloying and high alkalinity, chain-wales is mended and fed Al line, Ti microalloying → hello calcium line → continuous casting → heating of plate blank → high-pressure water descaling → roughing → finish rolling → section cooling → batch → pack warehouse-in.
Specifically, comprise the following steps:
1) slab is prepared: obtain slab according to above-mentioned weight percent continuous casting;
2) roughing: step 1) heating of plate blank that obtains obtains intermediate blank through roughing after 1185 ~ 1220 DEG C;
3) finish rolling: by step 2) gained intermediate blank is through finishing train finish rolling, and entry temperature at finishing controls at 960 ~ 1000 DEG C, and finishing temperature scope is 810 ~ 880 DEG C;
4) two sections of coolings: adopt the two section cooling modes strengthening cooling and common cooling combines to cool.Particularly, be cooled to the medium temperature of higher than coiling temperature 10 ~ 30 DEG C after finish rolling with the speed of cooling of 15 ~ 40 DEG C/s, air cooling, after 4 ~ 6 seconds, is cooled to 560 DEG C ~ 630 DEG C to batch with 5 ~ 15 DEG C/s speed of cooling.
As preferred embodiments of the present invention, step 2) slab rough rolling adopts 5 passages or 7 passes, and every time deflection is necessary >=and 20%.
As preferred embodiments of the present invention, step 3) entry temperature at finishing control 960 ~ 985 DEG C, the deflection more than 20% of finish rolling passage third from the bottom, the deflection of passage second from the bottom is more than 17%, the deflection of last passage is more than 10%, and finishing temperature scope is 830 ~ 865 DEG C.Ensure Unhydrated cement deflection, increase phase deformed nucleus core, fining ferrite grains.
As preferred embodiments of the present invention, step 4) two sections of coolings are after finish rolling, be cooled to the medium temperature of higher than coiling temperature 10 ~ 30 DEG C with the speed of cooling of 17-30 DEG C/sec, then air cooling is after 4 ~ 6 seconds, is finally cooled to coiling temperature 560 DEG C ~ 590 DEG C to batch with the speed of cooling of 8-12/ second.
The invention has the beneficial effects as follows: the present invention does not need to add the elements such as expensive Mo, Ni, advantage of lower cost, and rolling technology is simple, strong operability.The present invention does not need significantly to reduce its entry temperature at finishing yet in addition.Yield strength 480 ~ the 518MPa of the think gauge X65 pipe line steel of the 12mm-17mm that the present invention produces, tensile strength 560 ~ 660MPa, the ballistic work >=190J of-20 DEG C ,-20 DEG C of shear area more than 94% of dropping hammer.
Below by way of embodiment, the present invention is described in further detail, but do not limit the present invention, those skilled in the art make various change and replacement according to the present invention, only otherwise depart from spirit of the present invention, all should belong to the scope of claims of the present invention.
Embodiment
The technological process of production of the present invention is: after the concise slag desulfurization → stove of desulfurizing iron → converter smelting top-bottom blowing → deoxidation, alloying and high alkalinity, chain-wales is mended and fed Al line, Ti microalloying → hello calcium line → continuous casting → heating of plate blank → high-pressure water descaling → roughing → finish rolling → section cooling → batch → pack warehouse-in.
Think gauge X65 pipe line steel, its chemical composition consists of by weight percentage: C:0.07-0.10%, Si:0.10-0.30%, Mn:1.40-1.60%, P :≤0.020%, S :≤0.010%, Nb:0.030-0.039%, V:0.06-0.08%, Ti:0.008-0.019%, Cr:0.15-0.30%, all the other are Fe and inevitable impurity.
Preferred scheme is: C:0.07-0.09%, Si:0.15-0.25%, Mn:1.45-1.55%, P :≤0.018%, S :≤0.005%, Nb:0.035-0.039%, V:0.06-0.08%, Ti:0.010-0.017%, Cr:0.20-0.30%, all the other are Fe and inevitable impurity.
The production technique of think gauge X65 pipe line steel of the present invention is hot continuous rolling production technique, comprises the steps:
1) slab is prepared: obtain slab according to above-mentioned weight percent continuous casting;
2) roughing: step 1) heating of plate blank that obtains obtains intermediate blank through roughing after 1185 ~ 1220 DEG C.
3) finish rolling: by step 2) gained intermediate blank is through finishing train finish rolling, and entry temperature at finishing controls at 960 ~ 1000 DEG C, and finishing temperature scope is 810 ~ 880 DEG C, ensures Unhydrated cement deflection, increases phase deformed nucleus core, fining ferrite grains;
4) two sections of coolings: adopt the two section cooling modes strengthening cooling and common cooling combines to cool.Particularly, be cooled to the medium temperature of higher than coiling temperature 10 ~ 30 DEG C after finish rolling with the speed of cooling of 15 ~ 40 DEG C/s, air cooling, after 4 ~ 6 seconds, is cooled to 560 DEG C ~ 630 DEG C to batch with 5 ~ 15 DEG C/s speed of cooling.
As preferred embodiments of the present invention, step 2) slab rough rolling adopts 5 passages or 7 passes, and every time deflection is necessary >=and 20%.
As preferred embodiments of the present invention, step 3) entry temperature at finishing control 960 ~ 985 DEG C, the deflection more than 20% of finish rolling passage third from the bottom, the deflection of passage second from the bottom is more than 17%, the deflection of last passage is more than 10%, and finishing temperature scope is 830 ~ 865 DEG C.
As preferred embodiments of the present invention, step 4) two sections of coolings are after finish rolling, be cooled to the medium temperature of higher than coiling temperature 10 ~ 30 DEG C with the speed of cooling of 17-30 DEG C/sec, then air cooling is after 4 ~ 6 seconds, is finally cooled to coiling temperature 560 DEG C ~ 590 DEG C to batch with 8-12/ speed of cooling second.
Here is 10 embodiments of the present invention, and table 1 is the chemical composition of 10 embodiments of the present invention, and table 2 is hot rolling technology controlling valus, and table 3 is mechanical properties of coil of strip.
The chemical composition (%) of table 1 embodiment
| Embodiment | C | Si | Mn | P | S | Nb | V | Ti | Cr |
| 1 | 0.08 | 0.22 | 1.54 | 0.012 | 0.003 | 0.037 | 0.08 | 0.016 | 0.24 |
| 2 | 0.07 | 0.19 | 1.46 | 0.016 | 0.004 | 0.037 | 0.07 | 0.015 | 0.26 |
| 3 | 0.08 | 0.20 | 1.52 | 0.013 | 0.004 | 0.036 | 0.07 | 0.018 | 0.25 |
| 4 | 0.07 | 0.22 | 1.48 | 0.013 | 0.003 | 0.038 | 0.06 | 0.015 | 0.24 |
| 5 | 0.08 | 0.22 | 1.54 | 0.012 | 0.003 | 0.035 | 0.08 | 0.016 | 0.22 |
| 6 | 0.08 | 0.22 | 1.46 | 0.012 | 0.004 | 0.035 | 0.07 | 0.013 | 0.23 |
| 7 | 0.07 | 0.22 | 1.48 | 0.013 | 0.003 | 0.039 | 0.07 | 0.016 | 0.24 |
| 8 | 0.08 | 0.22 | 1.46 | 0.012 | 0.004 | 0.036 | 0.07 | 0.016 | 0.25 |
| 9 | 0.09 | 0.21 | 1.50 | 0.013 | 0.003 | 0.038 | 0.08 | 0.01 | 0.21 |
| 10 | 0.08 | 0.22 | 1.46 | 0.012 | 0.004 | 0.037 | 0.08 | 0.011 | 0.24 |
All the other are Fe and inevitable impurity.
The hot rolling technology controlling valu of table 2 embodiment
The mechanical property of the coil of strip of table 3 embodiment
Claims (10)
1. think gauge X65 pipe line steel, it is characterized in that, its chemical composition consists of by weight percentage: C:0.07-0.10%, Si:0.10-0.30%, Mn:1.40-1.60%, P :≤0.020%, S :≤0.010%, Nb:0.030-0.039%, V:0.06-0.08%, Ti:0.008-0.019%, Cr:0.15-0.30%, all the other are Fe and inevitable impurity.
2. think gauge X65 pipe line steel according to claim 1, it is characterized in that its chemical composition is by weight percentage: C:0.07-0.09%, Si:0.15-0.25%, Mn:1.45-1.55%, P :≤0.018%, S :≤0.005%, Nb:0.035-0.039%, V:0.06-0.08%, Ti:0.010-0.017%, Cr:0.20-0.30%, all the other are Fe and inevitable impurity.
3. the think gauge X65 pipe line steel according to any one of claim 1 or 2, is characterized in that: described X65 pipe line steel is through hot continuous rolling production technique and obtains, and its production technique is completed by following steps:
1) slab is prepared: obtain slab according to the weight percent described in claim 1 or 2 through smelting, continuous casting;
2) slab rough rolling: step 1) heating of plate blank that obtains obtains intermediate blank through roughing after 1185 ~ 1220 DEG C;
3) finish rolling: by step 2) gained intermediate blank is in finishing train finish rolling, and entry temperature at finishing controls at 960 ~ 1000 DEG C, and finishing temperature scope is 810 ~ 880 DEG C;
4) two sections of coolings: the medium temperature being cooled to higher than coiling temperature 10 ~ 30 DEG C after finish rolling with the speed of cooling of 15 ~ 40 DEG C/s, air cooling, after 4 ~ 6 seconds, is cooled to 560 DEG C ~ 630 DEG C to batch with 5 ~ 15 DEG C/s speed of cooling.
4. think gauge X65 pipe line steel according to claim 3, is characterized in that: step 2) slab rough rolling adopts 5 passages or 7 passes, and every time deflection is necessary >=and 20%.
5. think gauge X65 pipe line steel according to claim 3, it is characterized in that: step 3) entry temperature at finishing control 960 ~ 985 DEG C, the deflection more than 20% of finish rolling passage third from the bottom, the deflection of passage second from the bottom is more than 17%, the deflection of last passage is more than 10%, and finishing temperature scope is 830 ~ 865 DEG C.
6. think gauge X65 pipe line steel according to claim 3, it is characterized in that: step 4) the described pair of section cooling mode be cooled to the medium temperature of higher than coiling temperature 10 ~ 30 DEG C after finish rolling, air cooling, after 4 ~ 6 seconds, is cooled to 560 DEG C ~ 590 DEG C to batch with 8 ~ 12 DEG C/s speed of cooling.
7. the production method of think gauge X65 pipe line steel, is characterized in that: described X65 pipe line steel is through hot continuous rolling production technique and obtains, and its production technique is completed by following steps:
1) slab is prepared: carry out smelting according to the composition of following weight percents, continuous casting obtains slab:
C:0.07-0.10%, Si:0.10-0.30%, Mn:1.40-1.60%, P :≤0.020%, S :≤0.010%, Nb:0.030-0.039%, V:0.06-0.08%, Ti:0.008-0.019%, Cr:0.15-0.30%, all the other are Fe and inevitable impurity;
2) slab rough rolling: step 1) heating of plate blank that obtains obtains intermediate blank through roughing after 1185 ~ 1220 DEG C;
3) finish rolling: by step 2) gained intermediate blank is in finishing train finish rolling, and entry temperature at finishing controls at 960 ~ 1000 DEG C, and finishing temperature scope is 810 ~ 880 DEG C;
4) two sections of coolings: the medium temperature being cooled to higher than coiling temperature 10 ~ 30 DEG C after finish rolling with the speed of cooling of 15 ~ 40 DEG C/s, air cooling, after 4 ~ 6 seconds, is cooled to 560 DEG C ~ 630 DEG C to batch with 5 ~ 15 DEG C/s speed of cooling.
8. think gauge X65 pipe line steel according to claim 7, is characterized in that: step 2) slab rough rolling adopts 5 passages or 7 passes, and every time deflection is necessary >=and 20%.
9. think gauge X65 pipe line steel according to claim 7, it is characterized in that: step 3) entry temperature at finishing control 960 ~ 985 DEG C, the deflection more than 20% of finish rolling passage third from the bottom, the deflection of passage second from the bottom is more than 17%, the deflection of last passage is more than 10%, and finishing temperature scope is 830 ~ 865 DEG C.
10. think gauge X60 pipe line steel according to claim 7, it is characterized in that: step 4) described in the cooling of two sections be after finish rolling, be cooled to the medium temperature of higher than coiling temperature 10 ~ 30 DEG C with the speed of cooling of 17 ~ 30 DEG C/s, air cooling, after 4 ~ 6 seconds, is cooled to 560 DEG C ~ 590 DEG C to batch with 8 ~ 12 DEG C/s speed of cooling.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106244925A (en) * | 2016-09-05 | 2016-12-21 | 攀钢集团攀枝花钢铁研究院有限公司 | Think gauge X42 pipe line steel and production method thereof |
| CN106282798A (en) * | 2016-09-05 | 2017-01-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Think gauge X65 pipe line steel and production method thereof |
| CN107988562A (en) * | 2016-10-27 | 2018-05-04 | 鞍钢股份有限公司 | A kind of X65 grades inexpensive submerged pipeline steel and its manufacture method |
| CN109848211A (en) * | 2019-03-29 | 2019-06-07 | 山东钢铁集团日照有限公司 | A kind of manufacturing method reducing four iron scales of think gauge hot-strip |
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| CN102851599A (en) * | 2011-06-28 | 2013-01-02 | 鞍钢股份有限公司 | Thick-wall low-cost X65 hot rolled coil for spiral welded tubing and manufacture method thereof |
| CN104109744A (en) * | 2014-07-28 | 2014-10-22 | 攀钢集团西昌钢钒有限公司 | Method for improving pipeline steel drop-weight performance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102851599A (en) * | 2011-06-28 | 2013-01-02 | 鞍钢股份有限公司 | Thick-wall low-cost X65 hot rolled coil for spiral welded tubing and manufacture method thereof |
| CN104109744A (en) * | 2014-07-28 | 2014-10-22 | 攀钢集团西昌钢钒有限公司 | Method for improving pipeline steel drop-weight performance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106244925A (en) * | 2016-09-05 | 2016-12-21 | 攀钢集团攀枝花钢铁研究院有限公司 | Think gauge X42 pipe line steel and production method thereof |
| CN106282798A (en) * | 2016-09-05 | 2017-01-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Think gauge X65 pipe line steel and production method thereof |
| CN107988562A (en) * | 2016-10-27 | 2018-05-04 | 鞍钢股份有限公司 | A kind of X65 grades inexpensive submerged pipeline steel and its manufacture method |
| CN109848211A (en) * | 2019-03-29 | 2019-06-07 | 山东钢铁集团日照有限公司 | A kind of manufacturing method reducing four iron scales of think gauge hot-strip |
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