CN103725983A - Hot-rolled flat plate for X65 heat-stewed bend and production method of hot-rolled flat plate - Google Patents
Hot-rolled flat plate for X65 heat-stewed bend and production method of hot-rolled flat plate Download PDFInfo
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Abstract
The invention relates to a hot-rolled flat plate for an X65 heat-stewed bend and a production method of the hot-rolled flat plate, and belongs to the technical field of pipeline steel. The steel plate comprises the following components by weight percent: 0.02-0.05% of C, 0.10-040% of Si, 1.10-1.40% of Mn, not more than 0.015% of P, not more than 0.0015% of S, 0.03-0.07% of Nb, 0.02-0.07% of V, 0.010-0.030% of Ti, 0.10-0.30% of Ni, 0.10-0.30% of Cr, 0.15-0.30% of Cu, 0.010-0.050% of Alt, not more than 0.006% of N, not more than 0.00015% of H, not more than 0.004% of Ca, not less than 2.0% of Ca/s, and the balance of Fe and inevitable impurities. The technology comprises the following steps of blast furnace smelted iron predesulfurization, converter smelting, LF and RH purification, slab continuous casting, slab heating, rolling with a 4300 rolling mill, rapid cooling of activated calcium carbonate (ACC), cooling in heap, sampling and inspecting, warehousing and shipping. By adopting the hot-rolled flat plate and the production method thereof, the current situation that cracking pipeline steel is dependent on import due to thick hydrogen is effectively solved.
Description
Technical field
The invention belongs to pipeline steel technical field, particularly relate to hot rolled slab and production method for a kind of X65 hot-bending bends, be a kind of large wall thickness hydrogen sulfide corrosion resistant hydrogen induced cracking (HIC) (Hydrogen Induce Crack) X65 level hot-bending bends hot rolled slab that has, be 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 main transportation channel of current world energy sources, its security is subject to showing great attention to of society always, its safety in operation is huge on pipeline transportation company and pipeline by way of the people life property safety's in location impact, once generation pipeline breaking, just may cause huge property damage and serious personnel casualty accidents.Particularly, for hydrogen sulfide containing oil and gas, there is serious corrosion failure to steel in hydrogen sulfide in exploitation, transportation.
Because hydrogen sulfide corrosion in world wide in recent years causes the accident of pipeline breaking to happen occasionally, the loss causing cannot be estimated, while is along with the minimizing year by year of hydrocarbon resources amount, originally the gas field, high sulfur-bearing land of easy exploiting and deep-sea gas field development are not more and more, and hydrogen sulfide corrosion resistant pipe line steel demand is increasing.The increase of demand makes increasing researchist be devoted to the exploitation of hydrogen sulfide corrosion resistant steel and tubing, the mechanism of research hydrogen sulfide corrosion cracking, how, by the erosion resistance that steel product ingredient designs, technology controlling and process improves material, in use procedure kind, by necessary protection and dimension inspection measure, avoid the generation of corrosion cracking accident.
The present invention relates to the production method of hot rolled slab for steel plate thickness 25-35mm hydrogen sulfide corrosion resistant hydrogen induced cracking (HIC) X65 level hot-bending bends, in order to guarantee that steel plate anti-H 2 S performance meets NACE standard test requirement, following several measures have been taked 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) by Continuous Casting Soft Reduction Technology, tackle key problems, the grading of center segregation low power reaches 0.5 grade of C class; 3) by TMCP Technology, tackle key problems, appropriate design rolling and process for cooling, guarantee that steel plate obtains tiny uniform tissue morphology and controls banded structure.
Through many authoritative feeler mechanisies such as Shoudu Iron and Steel Co Qian'an Iron And Steel Company, Fanyu PCK steel pipe company and mole laboratories, Xi'an, carry out anti-H 2 S check, result shows that the hot-bending bends of producing has good hydrogen sulfide corrosion resistance energy with hot rolled slab.
Summary of the invention
The object of the present invention is to provide hot rolled slab and production method for a kind of X65 hot-bending bends, the antiacid steel for hot-bending bends plate of wall thickness 25-35mm hydrogen sulfide corrosion resistant hydrogen induced cracking (HIC) X65 level, effectively solved large wall thickness hydrogen induced cracking (HIC) pipe line steel dependence on import present situation, the pipeline career development of China has been significant.
The composition of steel plate of the present invention (by weight percentage) 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 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 cooling → cooling in heap → sampling fast, check → warehouse-in, shipping.
(1) adopt Clean Steel smelting technology, strictly control the easily segregation element content such as C, P, S, Mn
Because C, S element are 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 is pressed 0.030-0.050% scope control, and S content is pressed 0.0005-0.001% scope control; P, Mn belong to easy segregation element, line of segragation easily becomes hydrogen induced cracking (HIC) source, therefore require Composition Control stable, composition fluctuation is little, and in actual production process, P element quality percentage composition is less than 0.010%, Mn element quality percentage composition and is less than 1.40%, Mn can not be too low, otherwise intensity cannot reach requirement, in actual production, P content is pressed 0.006-0.010% scope control, and Mn content is pressed 1.10-1.30% scope control.
(2) by Continuous Casting Soft Reduction Technology, tackle key problems, the grading of center segregation low power reaches 0.5 grade of C class
Anti-H 2 S Pipeline Steel Plate is higher to heart portion specification of quality, therefore very strict to the specification of quality of strand, therefore adopt sheet billet continuous casting automatization to water steel, by optimization and the application of Continuous Casting Soft Reduction Technology, by apply the pressure of 1200-1800kN near continuous casting billet solidifying end, to produce the draught of 5-7mm, hinder the Molten Steel Flow containing enrichment segregation element, compensate continuously cast bloom core simultaneously and solidify caused volumetric shrinkage, avoid core to produce negative pressure because of solidification shrinkage, thereby 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) by Technology, tackle key problems, appropriate design rolling and process for cooling, guarantee that steel plate obtains tiny uniform tissue morphology and controls banded structure
For thickness specification, be greater than pipe line steel more than 25mm, its core structure degree of refinement directly has influence on block hammer performance and anti-H 2 S performance, becomes one of gordian technique of steel grades.During production, select the thick continuously cast bloom of 300mm, by the operation of rolling, impose aximal deformation value and rational compression ratio of two stages distributes, embodiment is for adopting 3.0-3.5 times of holding gauge, make rough rolling step cumulative deformation reach 60%-80%, 8500 tons of rolling force setup values, torque setting value 3200KNm, single pass maximum reduction reaches 34-38mm, make the abundant refinement of operation of rolling austenite crystal and homogenizing, thereby for phase-change organization's homogeneity provides good prerequisite, finish rolling start rolling temperature 850-880 ℃, finish rolling finishes rear steel plate and enters fast ACC and carry out cooling, roller table speed 1.2-1.5m/s, prevent that steel plate tail from entering water temp low and first separate out bulk proeutectoid ferrite and bainite banded structure, suitably improve final cooling temperature, final cooling temperature 500-580 ℃, avoid the anti-H 2 S check that exerts an influence of the hard phase constitution such as bainite.
Advantage of the present invention: the present invention has mass-produced satisfactory thick specification hydrogen sulfide corrosion resistant X65 level hot-bending bends hot rolled slab at present, and this technology becomes a reality the antiacid pipe line steel of the large wall thickness of domestic autonomous production.
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 ℃ is more than 300J,-15 ℃ of drop weight tearing experiment shear area (DWTT) are average more than 85%, hydrogen induced cracking rate: crack length rate CLR0%, crack width rate CTR0%, crackle area occupation ratio CSR0%.
Accompanying drawing explanation
Fig. 1 is continuously cast bloom macrostructure.
Fig. 2 is steel plate microstructure.
Embodiment
According to Composition Design provided by the invention and production method, in 100 tons of converters, smelt 300mm continuously cast bloom, rolling 28.8 respectively, 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 in Table 3, table 4, 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, is characterized 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.
2. a production method for hot rolled slab for X65 hot-bending bends claimed in 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 cooling → cooling in heap → sampling fast, check → warehouse-in in storage, shipping; It is characterized in that, the technical parameter of controlling in technique is as follows:
(1) adopt Clean Steel smelting technology, strict C, P, the easy segregation element content of S, Mn controlled: C content is pressed 0.030-0.050% scope control, S content is pressed 0.0005-0.001% scope control, and P content is pressed 0.006-0.010% scope control, and Mn content is pressed 1.10-1.30% scope control;
(2) by apply the pressure of 1200-1800kN near continuous casting billet solidifying end, to produce the draught of 5-7mm, hinder the Molten Steel Flow containing enrichment segregation element, compensate continuously cast bloom core simultaneously and solidify caused volumetric shrinkage, avoid core to produce negative pressure because of solidification shrinkage, the grading of center segregation of casting blank low power reaches C class 0.5;
(3) appropriate design rolling and process for cooling, guarantee that steel plate obtains tiny uniform tissue morphology and controls banded structure:
For thickness specification, be greater than pipe line steel more than 25mm, during production, select the thick continuously cast bloom of 300mm, by the operation of rolling, impose aximal deformation value and rational compression ratio of two stages distributes, adopt 3.0-3.5 times of holding gauge, make rough rolling step cumulative deformation reach 60%-80%, 8500 tons of rolling force setup values, torque setting value 3200KNm, single pass maximum reduction reaches 34-38mm, finish rolling start rolling temperature 850-880 ℃,, finish rolling finishes rear steel plate and enters fast ACC and carry out cooling, roller table speed 1.2-1.5m/s, final cooling temperature 500-580 ℃.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104789887A (en) * | 2015-04-02 | 2015-07-22 | 江阴兴澄特种钢铁有限公司 | Ultra-thick anti-HIC and anti-SSCC X65 pipeline steel plate and manufacturing method thereof |
| CN104831182A (en) * | 2015-04-02 | 2015-08-12 | 江阴兴澄特种钢铁有限公司 | Low yield-to-strength ratio anti-HIC and anti-SSCCX70 pipeline steel plate and making method thereof |
| 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 |
| 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 |
| CN110004364A (en) * | 2019-04-15 | 2019-07-12 | 邯郸钢铁集团有限责任公司 | Resist big loading stress sulfide corrosion X52MS hot-rolled sheet coil and manufacturing method |
| 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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| 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 |
| CN102301015A (en) * | 2009-01-30 | 2011-12-28 | 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 |
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| CN102301015A (en) * | 2009-01-30 | 2011-12-28 | 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 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104789887A (en) * | 2015-04-02 | 2015-07-22 | 江阴兴澄特种钢铁有限公司 | Ultra-thick anti-HIC and anti-SSCC X65 pipeline steel plate and manufacturing method thereof |
| CN104831182A (en) * | 2015-04-02 | 2015-08-12 | 江阴兴澄特种钢铁有限公司 | Low yield-to-strength ratio anti-HIC and anti-SSCCX70 pipeline steel plate and making method thereof |
| 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 |
| CN110004364A (en) * | 2019-04-15 | 2019-07-12 | 邯郸钢铁集团有限责任公司 | Resist big loading stress sulfide corrosion X52MS hot-rolled sheet coil and manufacturing method |
| 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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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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