CN103725983B - A kind of X65 hot-bending bends hot rolled slab and production method thereof - Google Patents
A kind of X65 hot-bending bends hot rolled slab and production method thereof Download PDFInfo
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Abstract
A kind of X65 hot-bending bends hot rolled slab and production method thereof, belong to technical field of pipeline steel. The composition weight percentage of steel plate is: C:0.02��0.05%, Si:0.10��0.40%, Mn:1.10��1.40%, P :��0.015%, S :��0.0015%, Nb:0.03��0.07%, V:0.02��0.07%, Ti:0.010��0.030%, Ni:0.10��0.30%, Cr:0.10��0.30%, Cu:0.15��0.30%, Alt:0.010��0.050%, N :��0.006%, H :��0.00015%, Ca :��0.004%, Ca/s >=2.0, surplus is Fe and inevitable impurity. Technique comprises: blast-melted �� molten iron pre-desulfurization �� converter smelting �� LF+RH refining �� sheet billet continuous casting �� heating of plate blank �� 4300 mill milling �� ACC cools �� pile cold �� sampling, inspection �� warehouse-in, shipping fast. Advantage is, efficiently solves big wall thickness hydrogen induced cracking (HIC) pipe line steel and relies on import present situation.
Description
Technical field
The invention belongs to technical field of pipeline steel, particularly relate to a kind of X65 hot-bending bends hot rolled slab and production method, it is that one has big wall thickness hydrogen sulfide corrosion resistant hydrogen induced cracking (HIC) (HydrogenInduceCrack) X65 level hot-bending bends hot rolled slab, it is applicable to the production of the straight-line joint submerged arc welding tube of transfer oil, Sweet natural gas.
Background technology
Oil and Natural Gas Transportation Pipeline is as one of the prevailing traffic channel of current world energy sources, its security is subject to showing great attention to of society always, pipeline transportation company and pipeline are huge by way of the impact of the people life property safety in location by its operating safety, once generation pipeline breaking, so that it may huge property damage and serious personal's injures and deaths accident can be caused. Particularly for hydrogen sulfide containing oil and gas, be there is serious corrosion failure by hydrogen sulfide in steel in exploitation, transportation.
Owing to hydrogen sulfide corrosion within the scope of the world in recent years causes the accident of pipeline breaking to happen occasionally, the loss caused cannot be estimated, simultaneously along with the minimizing year by year of hydrocarbon resources amount, originally the height of easy exploiting does not get more and more containing gas field, sulphur land and deep-sea gas field development, and hydrogen sulfide corrosion resistant pipe line steel demand is increasing. The increase of demand makes the researchist got more and more be devoted to the exploitation of hydrogen sulfide corrosion resistant steel and tubing, the mechanism of research hydrogen sulfide corrosion cracking, how to be improved the erosion resistance of material by steel product ingredient design, technology controlling and process, avoid the generation of corrosion cracking accident in use procedure kind by the protection of necessity and dimension inspection measure.
The present invention relates to the production method of steel plate thickness 25-35mm hydrogen sulfide corrosion resistant hydrogen induced cracking (HIC) X65 level hot-bending bends hot rolled slab, in order to ensure that steel plate anti-H 2 S performance meets NACE standard survey requirement, take following several measures in process of production: 1) adopt Clean Steel smelting technology, strictly control easily segregation element content and the lower molten steel overheat such as C, P, S, Mn; 2) being tackled key problems by continuous casting light Reduction Technology, the grading of center segregation low power reaches C class 0.5 grade; 3) tackled key problems by TMCP Technology, appropriate design rolling and process for cooling, it is ensured that steel plate obtains tissue morphology and the control banded structure of fine uniform.
Carrying out anti-H 2 S inspection through many authoritative feeler mechanisies such as Shoudu Iron and Steel Co Qian'an Iron And Steel Company, Fanyu PCK steel pipe company and laboratories, Xi'an mole, result shows that the hot-bending bends hot rolled slab produced has excellent hydrogen sulfide corrosion resistance energy.
Summary of the invention
It is an object of the invention to provide a kind of X65 hot-bending bends hot rolled slab and production method, the wall thickness 25-35mm hydrogen sulfide corrosion resistant antiacid steel for hot-bending bends plate of hydrogen induced cracking (HIC) X65 level, efficiently solve big wall thickness hydrogen induced cracking (HIC) pipe line steel and rely on import present situation, the pipeline career development of China is significant.
The composition (by weight percentage) of the steel plate of the present invention is:
C:0.02��0.05%, Si:0.10��0.40%, Mn:1.10��1.40%, P :��0.015%, S :��0.0015%, Nb:0.03��0.07%, V:0.02��0.07%, Ti:0.010��0.030%, Ni:0.10��0.30%, Cr:0.10��0.30%, Cu:0.15��0.30%, Alt:0.010��0.050%, N :��0.006%, H :��0.00015%, Ca :��0.004%, Ca/s >=2.0, surplus is Fe and inevitable impurity.
The production of the steel plate of the present invention comprises: blast-melted �� molten iron pre-desulfurization �� converter smelting �� LF+RH refining �� sheet billet continuous casting �� heating of plate blank �� 4300 mill milling �� ACC cools �� pile cold �� sampling, inspection �� warehouse-in, shipping fast.
(1) adopt Clean Steel smelting technology, strictly control the easily segregation element content such as C, P, S, Mn
Owing to C, S element is unfavorable to resistance against hydrogen cracking, anti-H 2 S pipe line steel requires low C, S content, its mass percent is substantially lower than 0.05%, 0.001%, and in actual production, C content presses 0.030-0.050% scope control, and S content presses 0.0005-0.001% scope control; P, Mn belong to easy segregation element, segregation district easily becomes hydrogen induced cracking (HIC) source, therefore it is required that Composition Control is stablized, composition fluctuation is little, and in actual production process, P element mass percentage is less than 0.010%, Mn element mass percentage and is less than 1.40%, Mn can not be too low, otherwise intensity cannot reach requirement, in actual production, P content presses 0.006-0.010% scope control, and Mn content presses 1.10-1.30% scope control.
(2) being tackled key problems by continuous casting light Reduction Technology, the grading of center segregation low power reaches C class 0.5 grade
Anti-H 2 S pipeline steel plate is higher to heart portion specification of quality, therefore the specification of quality of strand is very strict, therefore sheet billet continuous casting automatization is adopted to water steel, by the optimization of continuous casting light Reduction Technology and application, namely the Molten Steel Flow containing enrichment segregation element is hindered by applying the pressure of 1200-1800kN near continuous casting billet solidifying end to produce the draught of 5-7mm, compensate continuously cast bloom core portion simultaneously and solidify the volumetric shrinkage caused, core portion is avoided to produce negative pressure because of solidification shrinkage, thus effectively alleviate center segregation of continuous cast slab and center porosity, the grading of center segregation of casting blank low power reaches C class 0.5.
(3) tackled key problems by Technology, appropriate design rolling and process for cooling, it is ensured that steel plate obtains tissue morphology and the control banded structure of fine uniform
Pipe line steel thickness specification being greater than to more than 25mm, its core structure degree of refinement directly has influence on block hammer performance and anti-H 2 S performance, one of gordian technique becoming steel grades. 300mm thick continuously cast bloom is selected during production, aximal deformation value and the rational compression ratio distribution of two benches is imposed by the operation of rolling, embodiment is for adopting 3.0-3.5 times of holding gauge, rough rolling step cumulative deformation is made to reach 60%-80%, rolling force setup value 8500 tons, torque setting value 3200KNm, single pass maximum depression amount reaches 34-38mm, make the abundant refinement of operation of rolling austenite crystal and homogenizing, thus provide good prerequisite for phase-change organization's homogeneity, finish rolling start rolling temperature 850-880 DEG C, finish rolling terminates rear steel plate and enters ACC fast and cool, roller table speed 1.2-1.5m/s, prevent steel plate tail from entering water temp low and first precipitate out big block proeutectoid ferrite and bainite banded structure, suitably improve final cooling temperature, final cooling temperature 500-580 DEG C, the hard phase constitution such as bainite is avoided to have an impact anti-H 2 S inspection.
The advantage of the present invention: the present invention has mass-produced satisfactory think gauge hydrogen sulfide corrosion resistant X65 level hot-bending bends hot rolled slab at present, and this technology makes the big wall thickness acid-resistant pipeline steel of domestic autonomous production become a reality.
Its yield strength of steel plate that this generation is produced is 470-500MPa, tensile strength is 540-600MPa, the Charpy-V impact power of-30 DEG C is at more than 300J,-15 DEG C of drop weight tearings experiment shear area (DWTT) average more than 85%, hydrogen induced cracking rate: crack length rate CLR0%, crackle width rate CTR0%, crackle area occupation ratio CSR0%.
Accompanying drawing explanation
Fig. 1 is continuously cast bloom low power tissue.
Fig. 2 is steel plate microstructure.
Embodiment
According to composition provided by the invention design and production method, 300mm continuously cast bloom is smelted in 100 tons of converters, difference rolling 28.8,33.5mm steel plate on 4300mm wide and heavy plate mill, its chemical composition is in table 1, heating, water-cooling process parameter are in table 2, rolling technological parameter is in table 3, table 4, and plate property situation is in table 5.
Table 1 chemical composition
The heating of table 2 steel plate, water-cooling process parameter
Table 3 steel plate rolling technique parameter
The rolling technological parameter of table 4 steel plate
Table 5 plate property
Claims (2)
1. an X65 hot-bending bends hot rolled slab, it is characterised in that, the composition weight percentage of steel plate is:
C:0.02��0.05%, Si:0.10��0.40%, Mn:1.10��1.40%, P :��0.015%, S :��0.0015%, Nb:0.03��0.07%, V:0.02��0.07%, Ti:0.010��0.030%, Ni:0.10��0.30%, Cr:0.10��0.30%, Cu:0.15��0.30%, Alt:0.010��0.050%, N :��0.006%, H :��0.00015%, Ca :��0.004%, Ca/s >=2.0, surplus is Fe and inevitable impurity;
Described steel plate thickness 25-35mm.
2. a production method for X65 hot-bending bends hot rolled slab according to claim 1, technique comprises: blast-melted �� molten iron pre-desulfurization �� converter smelting �� LF+RH refining �� sheet billet continuous casting �� heating of plate blank �� 4300 mill milling �� ACC cools �� pile cold �� sampling, inspection �� warehouse-in, shipping fast; It is characterized in that, the technical parameter controlled in process is as follows:
(1) Clean Steel smelting technology is adopted, strictly control the easy segregation element content of C, P, S, Mn: C content is by 0.030-0.050% scope control, S content presses 0.0005-0.001% scope control, P content presses 0.006-0.010% scope control, and Mn content presses 1.10-1.30% scope control;
(2) Molten Steel Flow containing enrichment segregation element is hindered by applying the pressure of 1200-1800kN near continuous casting billet solidifying end to produce the draught of 5-7mm, compensate continuously cast bloom core portion simultaneously and solidify the volumetric shrinkage caused, avoiding core portion to produce negative pressure because of solidification shrinkage, the grading of center segregation of casting blank low power reaches C class 0.5 grade;
(3) appropriate design rolling and process for cooling, it is ensured that steel plate obtains tissue morphology and the control banded structure of fine uniform:
Thickness specification is greater than to the pipe line steel of more than 25mm, 300mm thick continuously cast bloom is selected during production, aximal deformation value and the rational compression ratio distribution of two benches is imposed by the operation of rolling, adopt 3.0-3.5 times of holding gauge, rough rolling step cumulative deformation is made to reach 60%-80%, rolling force setup value 8500 tons, torque setting value 3200KNm, single pass maximum depression amount reaches 34-38mm, finish rolling start rolling temperature 850-880 DEG C, finish rolling terminates rear steel plate and enters ACC fast and cool, roller table speed 1.2-1.5m/s, final cooling temperature 500-580 DEG C.
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| CN103993241A (en) * | 2014-05-30 | 2014-08-20 | 秦皇岛首秦金属材料有限公司 | Hot-rolled flat plate for composite acid-resistant pipeline steel base and production method thereof |
| CN104404378A (en) * | 2014-12-19 | 2015-03-11 | 山东钢铁股份有限公司 | Wide and thick steel plate for hot-bent elbow pipes at X65-X80 levels and manufacturing method of wide and thick steel plate |
| CN104831182B (en) * | 2015-04-02 | 2017-03-01 | 江阴兴澄特种钢铁有限公司 | A kind of low yield strength ratio hic resistance and anti-SSCCX70 Pipeline Steel Plate and its manufacture method |
| CN104789887B (en) * | 2015-04-02 | 2017-03-01 | 江阴兴澄特种钢铁有限公司 | A kind of ultra thick gauge hic resistance and anti-SSCCX65 Pipeline Steel Plate and its manufacture method |
| 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 |
| CN106563781A (en) * | 2016-11-02 | 2017-04-19 | 首钢总公司 | Soft pressing control method for container steel resistant to hydrogen induced cracks |
| CN110004364B (en) * | 2019-04-15 | 2021-05-28 | 邯郸钢铁集团有限责任公司 | Large loading stress sulfide corrosion resistant X52MS hot-rolled plate coil and manufacturing method thereof |
| CN116493433A (en) * | 2023-06-15 | 2023-07-28 | 张家港沙龙精密管业有限公司 | Intelligent management method and system for customizing steel pipe manufacturing process |
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| CN103276291A (en) * | 2009-01-30 | 2013-09-04 | 杰富意钢铁株式会社 | Heavy gauge, high tensile strength, hot rolled steel sheet with excellent HIC resistance and manufacturing method therefor |
| CN101775556A (en) * | 2009-12-30 | 2010-07-14 | 首钢总公司 | X65 hot-rolled coil for use in acidic environment and manufacturing method thereof |
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Address after: 066328 Du Zhuang Township, Funing County, Qinhuangdao, Hebei Co-patentee after: Shougang Group Co. Ltd. Patentee after: Qinhuangdao Shouqin Metal Material Co., Ltd. Address before: 066328 Du Zhuang Township, Funing County, Qinhuangdao, Hebei Co-patentee before: Capital Iron & Steel General Company Patentee before: Qinhuangdao Shouqin Metal Material Co., Ltd. |
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Effective date of registration: 20190529 Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 066328 Du Zhuang Township, Funing County, Qinhuangdao, Hebei Co-patentee before: Shougang Group Co. Ltd. Patentee before: Qinhuangdao Shouqin Metal Material Co., Ltd. |
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