WO2022116607A1 - 一种耐硫酸露点腐蚀热轧圆钢09CrCuSb的生产工艺 - Google Patents

一种耐硫酸露点腐蚀热轧圆钢09CrCuSb的生产工艺 Download PDF

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WO2022116607A1
WO2022116607A1 PCT/CN2021/115467 CN2021115467W WO2022116607A1 WO 2022116607 A1 WO2022116607 A1 WO 2022116607A1 CN 2021115467 W CN2021115467 W CN 2021115467W WO 2022116607 A1 WO2022116607 A1 WO 2022116607A1
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rolling
round steel
steel
09crcusb
temperature
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PCT/CN2021/115467
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English (en)
French (fr)
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刘桂华
冯治胜
邓再兴
李树杰
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天津钢铁集团有限公司
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007—Cutting or shearing the product
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Definitions

  • the invention belongs to the technical field of metallurgical manufacturing, in particular to a production process of sulfuric acid dew point corrosion-resistant hot-rolled round steel 09CrCuSb.
  • the present invention provides a production process for developing a sulfuric acid dew point corrosion-resistant hot-rolled round steel 09CrCuSb to solve the sulfuric acid corrosion problem of the flue gas treatment system.
  • the invention discloses a production process of the above-mentioned sulfuric acid dew point corrosion-resistant round steel 09CrCuSb.
  • the process route is as follows: 150mm ⁇ 150mm continuous casting billet inspection, casting billet distribution, heating furnace, high-pressure water descaling, rough rolling unit, 1# Shearing head and tail, middle rolling unit, caliper, 2# shearing machine, apron roller table, cooling bed, fixed-length shearing, double roller table, three-segment chain transmission, inspection, finished product collection , packing, weighing, signage, slow cooling, storage;
  • casting billet cloth the billet needs 15 steps in the heating furnace with the previous steel type, and 10 steps with the latter steel type to prevent the liquefaction and precipitation of Cu element;
  • Heating furnace adopts three-stage heating, controlled by low-temperature slow-burning process, the size of the billet is 150mm ⁇ 150mm, the temperature of the first heating section is ⁇ 850°C, the temperature of the second heating section is 1000-1070°C, and the temperature of the soaking section is 1020-1060 °C; the total heating time is 90-100min, and the heating time in the soaking section is not more than 35min;
  • High-pressure water descaling ensure that the descaling pressure is not less than 14.5MPa;
  • Rough rolling mill Adjust the pass pattern of the third frame of the rough rolling mill; (1) The width of the groove bottom of the pass is changed from 102mm to 110.61mm; (2) The width of the pass groove is changed from 142mm to 147mm; (3) The pass 4 The rounded corner R was changed from 10mm to 35mm; (4) 180 side wall bevels were canceled ;
  • the rolling rhythm interval is adjusted to 30S-35S, which is synchronized with the billet heating and fixed-length shearing to maintain continuous and stable production;
  • Adjusting the rated tonnage of the roll grooves of the roughing mill On the basis of the existing rated tonnage of the rolls and grooves of the roughing mill, reduce the rated tonnage of the roughing mill rolls for each pass; specifically:
  • Adjust the rolling process of ⁇ 60mm round steel increase the 7th and 8th rolling mills of the middle rolling group in the existing 8 rolling passes, a total of 10 rolling passes, and redistribute the 10 rolling passes. Reduction amount, so that the material distribution is uniform;
  • Adjust the cooling bed fabric formulate a cooling bed fabric cooling system to reduce the scratches on the surface of the round bar during the cut-to-length process; the length of the cooling bed is 120 meters and the width is 13.87 meters; the rolled corrosion-resistant round bar has a specification of ⁇ 50mm— ⁇ 70mm, which is medium Specifications of hot-rolled round steel, the cooling bed is designed with a 4-step interval, to ensure that each double-sized round steel is evenly cooled on the cooling bed, and to ensure that the shearing temperature at fixed length is lower than 350 °C to prevent the surface of the round steel from being scratched during the shearing process. ;
  • Adjust the slow cooling process speed up the collection speed of round steel products, adopt offline slow cooling, and carry out 48-hour heat preservation and cooling process for round steel products.
  • the heating process selects low temperature and slow burning, prolongs the rolling rhythm, and strictly controls the holding time of the soaking section to reduce the enrichment of Cu elements on the steel surface, and formulate the design process of the casting billet fabric;
  • the rolling rhythm is controlled at 30S-35S, which is matched with the heating process, and at the same time, it can ensure the fixed-length shearing temperature and effectively reduce the scratches on the surface of the round steel.
  • the 09CrCuSb steel for pipe-making produced by the invention has product specifications: ⁇ 50mm, ⁇ 60mm, ⁇ 65mm, ⁇ 70mm, and the performances are good and fully meet the requirements of relevant standards.
  • Fig. 1 is a schematic diagram of the hole pattern structure of the existing third frame
  • FIG. 2 is a schematic view of the hole pattern structure of the third frame of the present invention.
  • the sulfuric acid dew point corrosion-resistant round steel 09CrCuSb produced by the invention is used for producing low-pressure sulfuric acid-resistant seamless pipes, and the metallographic structure is ferrite + pearlite.
  • 09CrCuSb steel During rolling at this time, the rolling stress causes the surface of the slab to crack, forming "star-shaped" network cracks; steel The hardness is low, and it is extremely difficult to control the scratch on the surface of the round steel.
  • 09CrCuSb steel also has good comprehensive process characteristics such as cold heading and cold drawing.
  • the development of 09CrCuSb steel effectively solves the problem of sulfuric acid corrosion of equipment, reduces costs, saves energy, and at the same time increases the service life of the steel used in the flue gas treatment system. benefit.
  • a production process of the above-mentioned sulfuric acid dew point corrosion-resistant round steel 09CrCuSb the process route is in sequence: 150mm ⁇ 150mm continuous casting billet inspection, casting billet distribution, heating furnace, high-pressure water descaling, rough rolling unit, 1# shearing machine Shearing head and tail, middle rolling unit, caliper, 2# shearing machine, apron roller table, cooling bed, fixed-length shearing, double roller table, three-segment chain transmission, inspection, finished product collection, packaging, Weighing, sign, slow cooling, storage;
  • the heating furnace adopts three-stage heating, the size of the billet is 150mm ⁇ 150mm, and the billet heating process adopts the temperature of the first heating section ⁇ 850°C, the temperature of the second heating section is 1000-1070°C, and the temperature of the soaking section is 1020-1060°C; the total heating time It is 90-100min, and the heating time of the soaking section is not more than 35min.
  • the temperature of the second heating section of the conventional steel is 1030-1180°C, the temperature of the soaking section is 1050-1150°C, and the total heating time is 60-75min.
  • the design idea of the patented heating process of the present invention is to burn slowly at a low temperature, which can inhibit the precipitation of copper elements and enable other alloy elements to be fully diffused by heating for a long time.
  • Casting billet cloth The billet needs 15 steps in the heating furnace with the previous steel type, and 10 steps with the latter steel type to prevent the liquefaction and precipitation of Cu element.
  • the blanks of conventional varieties are emptied for 4 steps before and after the distribution in the heating furnace to prevent mixing of steel types.
  • High-pressure water descaling ensure that the descaling pressure is not less than 14.5MPa.
  • Adjust the pass pattern of the third frame of the rough rolling mill (1) The width of the groove bottom of the pass is changed from 102mm to 110.61mm; (2) The width of the pass groove is changed from 142mm to 147mm; (3) The pass has 4 rounded corners R Modified from 10mm to 35mm; (4) Cancel the 18° sidewall bevel; the pass pattern of the third frame of the roughing mill is optimized to be a large arc chamfer pass, which increases the fluidity of metal deformation and prevents wrinkle quality defects on the surface of the round steel. Optimize the pass design of the third frame of the roughing mill to avoid the uneven deformation of the red billet resulting in wrinkled cluster cracks on its surface.
  • Adjust the rolling rhythm, and the rolling interval is 30-35S, which is synchronized with the billet heating and fixed-length shearing to maintain continuous and stable production.
  • the rolling rhythm interval for the production of conventional varieties is 2-5S
  • the rolling rhythm for the production of sulfuric acid corrosion-resistant round steel is designed to be 30-35S.
  • the chemical composition of the invention is designed to contain copper elements, and the melting point temperature of copper is 1083 ° C.
  • the temperature of the second heating section is designed to be 1000-1070 ° C, and the temperature of the soaking section is 1020-1060 ° C; It contains chromium, antimony and other alloying elements.
  • the low temperature heating needs to prolong the heating time to make the alloying elements fully diffuse and not segregate.
  • the patented design heating time is 90-100min, which is 30min longer than that of conventional steel.
  • the rolling rhythm is controlled at 30-35S, which can be Match the heating time to ensure production continuity and stability.
  • Adjusting the rated tonnage of the roll groove of the rough rolling unit due to the reduction of the rolling temperature, the wear of the rolling stock to the groove is intensified, the aging of the groove is intensified, and the surface of the roll is pitted or cracked. After heating, the billet will be in the rolling process. , Because the corrosion-resistant steel is designed as a low-carbon peritectic steel, the steel is soft, so the surface of the billet is in contact with the rolls. Visually visible pitting defects are formed on the steel surface. Table 1 shows the adjustment of the tonnage of steel passing through the groove.
  • the steel passing capacity of the rolling groove cannot be higher than the maximum tonnage: reduce the steel passing capacity of the rough rolling mill, the first frame is 4000 tons, the second frame is 4000 tons, the third frame is 4000 tons, the fourth frame is 4000 tons, and the fifth frame is 4000 tons.
  • the rolling process improvement plan for the production of ⁇ 60mm round steel is optimized and designed, which effectively solves the quality problem of ear defects caused by partial bulges at the end of the finished product.
  • Danieli's design and production of ⁇ 60mm round steel is the 11th and 12th rolling mills of 6 rough rolling and intermediate rolling mills, with a total of 8 rolling passes. Due to the unreasonable matching of material types, the end of the round steel is partially raised. Ear defects are formed, and various measures have not been completely solved.
  • two rolling mills, the 7th and the 8th stand of the middle rolling mill were added, with a total of 10 rolling passes, and the reduction amount of the 10 rolling passes was redistributed to make the distribution of the material type better.
  • the uniform rolling process scheme completely solves the problem of tail ear defects.
  • Formulate a cooling system for cooling bed fabrics to reduce scratches on the surface of the round steel during the sizing shearing process.
  • the cooling bed is 120 meters long and 13.87 meters wide.
  • the rolled corrosion-resistant round bar is ⁇ 50mm— ⁇ 70mm, which belongs to the medium-sized hot-rolled round bar.
  • the design interval of cooling bed distribution is 4 steps (the conventional steel cooling bed is not empty) to ensure that each double-footed round bar is evenly cooled on the cooling bed. Make sure that the cut-to-length shearing temperature is lower than 350°C to prevent scratches on the surface of the round steel during the shearing process.
  • the corrosion-resistant steel contains alloying elements such as Cr, Cu, and Sb.
  • the finished round steel is used for a 48-hour heat preservation and cooling process.
  • the present invention develops a distribution system and a low-temperature slow-burning heating process to reduce the enrichment of Cu elements on the steel surface and avoid "star-shaped" cracks in the round steel; 2) the present invention optimizes the rough rolling mill hole 3) The present invention develops an optimized process for rolling rhythm control and rolling mill layout to solve the problem of ear print quality defects at the tail of the round steel; 4 ) The present invention adopts the new material application technology of ceramic roller table to avoid scratches on the surface of the round steel; 5) The present invention formulates a cooling bed cloth cooling system to reduce the scratches on the surface of the round steel in the process of sizing shearing.
  • 09CrCuSb sulfuric acid dew point corrosion-resistant steel is low-carbon peritectic steel, the steel is soft, the transportation roller on the production line is worn, or the red steel is in contact with the guide groove during operation, etc., the surface of the round steel will have scratches. Therefore, the ceramic roller table of wear-resistant new material is developed and applied. The amount of steel passing through is 20 times that of the traditional roller table, preventing the wear of the roller table from causing scratches on the surface of the round steel.
  • the main control difficulty of a hot-rolled round steel production process that is resistant to sulfuric acid dew point corrosion is that copper-containing steel is prone to "Cu" segregation, resulting in the formation of star-shaped cracks on the surface of the round steel.
  • Quality defects the traditional process is to use chemical
  • the composition is designed to add nickel alloy, and the hot-rolled round steel is peeled into the process route of bright material delivery.
  • the invention is a production process of corrosion-resistant steel without adding nickel alloy, and uses black-skin delivery hot-rolled material instead of bright material, which saves alloy cost, improves the yield of round steel, and realizes resource saving while improving economic benefit. .
  • the production process needs to strictly control the process parameters of each link, and the process links affect each other, and must be fully realized to ensure the quality of the final product.
  • the chemical composition of the finished product is shown in Table 2.
  • the composition is qualified and meets the internal control requirements.
  • the slab size of ⁇ 50mm is 150 ⁇ 150 ⁇ 11350mm, and the size of ⁇ 65mm is 150 ⁇ 150 ⁇ 11000mm.
  • the billet undergoes three-stage heating treatment.
  • the average time of the billet in the furnace is about 100min. °C;
  • the average time of ⁇ 65mm billet in the furnace is about 120min.
  • the heating temperature of each section is: the temperature of the preheating section is 800-830 °C, the temperature of the heating section is 1050-1070 °C, and the temperature of the soaking section is 1060-1080 °C. The temperature dropped to 1000-1020°C.
  • the rolling temperature of ⁇ 50mm specification is 1020-1040°C
  • the rolling temperature of ⁇ 65mm specification is 1030-1050°C.
  • the metallographic structure of the two specifications is normal, which is normal ferrite + pearlite.
  • the actual grain size of the two specifications is not much different, and the actual grain size is 7.5, indicating that the off-line thermal insulation effect is good.
  • the external dimension measurement and visual inspection of the surface quality are shown in Table 5.
  • Table 5 there are more scratches on the surface of ⁇ 65mm, 11 scratches, the deepest is 0.20mm, and there are cracks visible to the naked eye on the surface, the cracks are irregular cracks, the deepest crack is 0.20mm, there are oxides in the cracks, and there are cracks around the cracks.
  • Oxidation dots have Cu element segregation detected by energy spectrum; ⁇ 50mm specification has less scratches on the surface, cracks on the edges, the deepest crack is 0.15mm, there are oxides in the cracks, and there are oxidized dots around the cracks.
  • the chemical composition of the finished product is shown in Table 7.
  • the composition is qualified and meets the internal control requirements.
  • the slab size of ⁇ 50mm specification is 150 ⁇ 150 ⁇ 11350mm, and the size of ⁇ 65mm specification is 150 ⁇ 150 ⁇ 11000mm.
  • the billet is subjected to three-stage heating treatment.
  • the heating system is: the temperature of the preheating section is 750-800 °C, the temperature of the heating section is 1000-1030 °C, the temperature of the soaking section is 1020-1040 °C, the heating time of the billet heating section is 90-100min, and the soaking temperature is 90-100 minutes.
  • the heating time of the section is 32min.
  • the actual temperature control soaking section is the middle and lower limit.
  • the rolling process in the steel rolling process, according to the required product size system and reasonable rolling process, strictly control the red billet size according to the rolling system, ensure the surface quality of the round steel, the rolling rhythm is controlled at 30S, the shear temperature is guaranteed, the ceramic Roller transmission can effectively reduce the scratches on the surface of the round steel; the finished round steel is heat-insulated for 48 hours to avoid shear cracks.
  • the metallographic structure is normal structure ferrite + pearlite, no abnormal structure appears, and the scratch depth is controlled below 0.15mm.
  • the external dimensions and surface quality are shown in Table 10.
  • the control meets the requirements of the agreement.
  • the surface quality of the round steel has been significantly improved, and the star-shaped cracks have been eliminated. No segregation of Cu elements was found on the surface detected by energy spectrum.
  • the chemical composition of the finished product is shown in Table 12.
  • the composition is qualified and meets the internal control requirements.
  • the slab size of ⁇ 50mm is 150 ⁇ 150 ⁇ 11350mm, and the size of ⁇ 65mm is 150 ⁇ 150 ⁇ 11000mm.
  • the billet is subjected to three-stage heating treatment.
  • the heating system is: the temperature of the preheating section is 750-800 °C, the temperature of the heating section is 1000-1030 °C, the temperature of the soaking section is 1020-1040 °C, the heating time of the billet heating section is 90-100min, and the soaking temperature is 90-100 minutes.
  • the heating time of the section is 34min.
  • the actual temperature control soaking section is the middle and lower limit.
  • the red billet size is strictly controlled according to the rolling system, to ensure the surface quality of the round steel, the rolling rhythm is controlled at 32S, the shear temperature is guaranteed, the ceramic Roller transmission can effectively reduce the scratches on the surface of the round steel; the finished round steel is heat-insulated for 48 hours to avoid shear cracks.
  • the metallographic structure is normal structure ferrite + pearlite, there is no abnormal structure, and the scratch depth is controlled below 0.16mm.
  • the invention designs a feasible process route of 09CrCuSb sulfuric acid dew point corrosion resistant steel for tube billet, adds alloy elements such as Cr, Cu, Sb, uses 150mm ⁇ 150mm square billet, and the three-stage heating furnace billet low-temperature slow-burning heating process optimizes the The pass design of the 3rd frame of the rough rolling mill, changing the rolling passes of ⁇ 60mm round steel from 8 passes to 10 passes, recalculating the reduction amount of each pass, and controlling the rolling rhythm to 30S-35S, the produced 09CrCuSb is resistant to sulfuric acid dew point corrosion and has stable chemical composition, low content of phosphorus, sulfur and other elements, good control of non-metallic inclusions, good quality and good performance of the cast billet, and fully meets the requirements of relevant standards. After being used by downstream customers and tested by special acid resistance inspection institutions, this steel has excellent sulfuric acid resistance.

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Abstract

一种耐硫酸露点腐蚀热轧圆钢09CrCuSb的生产工艺，圆钢09CrCuSb的化学成分按重量百分比计，C：0.06-0.09％，Si：0.26-0.38％，Mn：0.48-0.60％，Cr：0.90-1.00％，Cu：0.30-0.40％，Sb：0.07-0.09％，P≤0.015％，S≤0.008％，Ni≤0.15％，N≤0.0060％，H≤0.0002％，O≤0.0020％，其余为平衡量的Fe。通过科学的化学成分设计，使钢材表面形成钝化膜，耐腐蚀性能符合使用要求；制定适宜有效的加热、轧钢和冷却工艺，有效避免含铜钢裂纹产生，实现耐腐蚀钢09CrCuSb黑皮交货热轧材代替光亮材的行业突破，提高成材率5％以上。

Description

一种耐硫酸露点腐蚀热轧圆钢09CrCuSb的生产工艺 技术领域
本发明属于冶金制造技术领域，尤其是一种耐硫酸露点腐蚀热轧圆钢09CrCuSb的生产工艺。
背景技术
在石油、冶金、电力、石化等工业领域，以重油或燃煤作为主要工业燃料的烟气处理系统，如锅炉低温部位的空气预热器、热交换气、省煤器、烟道、烟囱以及脱硫装置等，普遍会遇到燃料中含硫量偏高，在燃烧以后会生成SO 2，其中一部分还会再生成SO 3。SO 3在达到露点温度时与水蒸气结合生成H 2SO 4，由稀变浓，造成设备的腐蚀，这种现象称之为“硫酸露点腐蚀”。与普通的大气腐蚀现象不同，其不仅腐蚀普通碳钢，而且能够腐蚀不锈锅，对工业生产设备造成极大的危害。
发明内容
针对现有技术存在的问题，本发明提供了一种解决烟气处理系统的硫酸腐蚀问题而研制一种耐硫酸露点腐蚀热轧圆钢09CrCuSb的生产工艺。
本发明是这样实现的，一种耐硫酸露点腐蚀圆钢09CrCuSb，圆钢09CrCuSb的化学成分按重量百分比计，C＝0.06-0.09％，Si＝0.26-0.38％，Mn＝0.48-0.60％，Cr＝0.90-1.00％，Cu＝0.30-0.40％，Sb＝0.07-0.09％，P≤0.015％，S≤0.008％，Ni≤0.15％，N≤0.0060％，H≤0.0002％，O≤0.0020％，其余为平衡量的Fe。
本发明公开一种上述耐硫酸露点腐蚀圆钢09CrCuSb的生产工艺，其工艺路线依次为：150mm×150mm连铸方坯检验、铸坯布料、加热炉、高压水除鳞、粗轧机组、1#剪切机剪头尾、中轧机组、测径仪、2#剪切机切倍尺、裙板辊道、冷床、定尺剪切、双辊道、三段链传输、检验、成品收集、打包、称重、标牌、缓冷、入库；
其中；铸坯布料：坯料在加热炉内与前一个钢种需空步15步，与后一个钢种需空步10步，防止Cu元素液化析出；
加热炉：采用三段式加热，低温慢烧工艺控制，钢坯尺寸为150mm×150mm，钢坯加热工序采用一加热段温度≤850℃，二加热段温度1000-1070℃，均热段温度1020-1060℃；总加热时间为90-100min，均热段加热时间不大于35min；
高压水除鳞：保证除鳞压力不小于14.5MPa；
粗轧机组：调整粗轧机组的第3架孔型；(1)孔型槽底宽度由102mm修改为110.61mm； (2)孔型槽口宽度由142mm修改为147mm；(3)孔型4个圆角R由10mm修改为35mm；(4)取消18 0侧壁斜角；
调整粗轧机组轧制节奏：轧制节奏间隔调整为30S-35S，与钢坯加热、定尺剪切保持同步连续稳定生产；
调整粗轧机组轧辊轧槽额定吨位：在现有的粗轧机组轧辊轧槽额定吨位的基础上降低每个架次的粗轧机组轧辊轧制额定吨位；具体为：
粗轧架次 1架/吨 2架/吨 3架/吨 4架/吨 5架/吨 6架/吨
调整吨位 8000 8000 7000 7000 6000 6000
调整Ф60mm圆钢的轧制工艺：在现有8个轧制道次增加中轧机组第7架和第8架两台轧机，共10个轧制道次，重新分配10个轧制道次的压下量，使料型分布均匀；
Figure PCTCN2021115467-appb-000001
调整冷床布料：制定冷床布料冷却制度，减少圆钢表面在定尺剪切过程中产生划伤；冷床长度120米，宽度13.87米；轧制耐腐蚀圆钢规格Ф50mm—Ф70mm，属于中等规格热轧圆钢，设计冷床布料间隔4步，保证每支倍尺圆钢在冷床上均匀冷却，确保定尺剪切温度要低于350℃，防止剪切过程中圆钢表面产生划伤；
调整缓冷工艺：加快圆钢成品收集速度，采用线下缓冷，圆钢成品进行48小时保温处理冷却工艺。
本发明有益效果是：
(1)化学成分通过加入Cr、Cu、Sb等合金元素，可以在钢材表面形成阻止硫酸腐蚀的钝化膜，提高材料的耐蚀性。通过科学的化学成分设计，制定适宜有效的加热、轧钢和冷却工艺，有效保证了圆钢化学成分，耐腐蚀性能符合相关标准和使用需求，通过该工艺，避免了含铜钢裂纹的产生，实现了耐腐蚀钢09CrCuSb黑皮交货热轧材代替光亮材的突破，提高圆钢成材率5％以上。
(2)09CrCuSb钢中Cu的含量比较高，加热、轧制难度比较大。当铸坯表面的Cu 含量超出在铁中的溶解度，Cu元素就会沿着晶界扩散，形成网状富Cu相。当铸坯温度高出Cu的熔点(1083℃)时，富Cu相处于熔融状态，在这个时候进行轧制时，轧制应力导致铸坯表面开裂，形成“星形”的网状裂纹；钢材硬度较低，对于圆钢表面划伤控制难度极大。在轧制09CrCuSb钢的过程主要采取以下措施，有效避免了龟裂现象发生：
a)09CrCuSb钢C含量控制在0.08％左右，低碳钢在轧制过程中热变形抗力比较小。
b)加热工艺选择低温慢烧、延长轧制节奏、严格控制均热段保温时间，以减少Cu元素在钢表面的富集，并制定铸坯布料设计工艺；
c)严格控制加热炉内炉气温度＜1080℃，连铸方坯出加热炉的温度控制在1000℃-1050℃，减少Cu元素的偏聚，保证钢材表面质量；
d)轧制节奏控制在30S-35S，与加热工艺相匹配，同时可保证定尺剪切温度，有效减少圆钢表面划伤。
(3)09CrCuSb钢还具有良好的冷镦、冷拔等综合工艺特性。
(4)09CrCuSb钢的研制，有效解决了设备的硫酸腐蚀问题，降低了成本，节约了能源，同时，增加了烟气处理系统用钢的使用寿命，客户反应使用情况良好，创造了可观的经济效益。
采用本发明生产的09CrCuSb制管用钢，产品规格为：Ф50mm、Ф60mm、Ф65mm、Ф70mm，各项性能良好，完全满足相关标准要求。
附图说明
图1是现有第3架孔型结构示意图；
图2是本发明第3架孔型结构示意图。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
本发明的生产耐硫酸露点腐蚀圆钢09CrCuSb，主要化学成分按重量百分比计，C＝0.06-0.09％，Si＝0.26-0.38％，Mn＝0.48-0.60％，Cr＝0.90-1.00％，Cu＝0.30-0.40％，Sb＝0.07-0.09％，P≤0.015％，S≤0.008％，Ni≤0.15％，N≤0.0060％，H≤0.0002％，O≤0.0020％，其余为平衡量的Fe。本发明生产出的耐硫酸露点腐蚀圆钢09CrCuSb用于生产低压耐硫酸无缝管，金相组织为铁素体+珠光体，各项性能指标完全满足技术协议要求。 具有以下特性：(1)化学成分通过加入Cr、Cu、Sb等合金元素，可以在钢材表面形成阻止硫酸腐蚀的钝化膜，提高材料的耐蚀性。(2)09CrCuSb钢中Cu的含量比较高，加热、轧制难度比较大。当铸坯表面的Cu含量超出在铁中的溶解度，Cu元素就会沿着晶界扩散，形成网状富Cu相。当铸坯温度高出Cu的熔点(1083℃)时，富Cu相处于熔融状态，在这个时候进行轧制时，轧制应力导致铸坯表面开裂，形成“星形”的网状裂纹；钢材硬度较低，对于圆钢表面划伤控制难度极大。(3)09CrCuSb钢还具有良好的冷镦、冷拔等综合工艺特性。(4)09CrCuSb钢的研制，有效解决了设备的硫酸腐蚀问题，降低了成本，节约了能源，同时，增加了烟气处理系统用钢的使用寿命，客户反应使用情况良好，创造了可观的经济效益。
一种上述耐硫酸露点腐蚀圆钢09CrCuSb的生产工艺，其工艺路线依次为：150mm×150mm连铸方坯检验、铸坯布料、加热炉、高压水除鳞、粗轧机组、1#剪切机剪头尾、中轧机组、测径仪、2#剪切机切倍尺、裙板辊道、冷床、定尺剪切、双辊道、三段链传输、检验、成品收集、打包、称重、标牌、缓冷、入库；
其中，加热炉采用三段式加热，钢坯尺寸为150mm×150mm，钢坯加热工序采用一加热段温度≤850℃，二加热段温度1000-1070℃，均热段温度1020-1060℃；总加热时间为90-100min，均热段加热时间不大于35min。常规钢种二加热段温度1030-1180℃，均热段温度1050-1150℃，总加热时间为60-75min。本发明专利加热工艺设计思路是低温慢烧，即可抑制铜元素析出，又能使其它合金元素通过长时间加热达到充分扩散的目的。
铸坯布料：坯料在加热炉内与前一个钢种需空步15步，与后一个钢种需空步10步，防止Cu元素液化析出。常规品种坯料在加热炉内布料前后各空步4步，防止混钢种。
高压水除鳞：保证除鳞压力不小于14.5MPa。
调整粗轧机组的第3架孔型；(1)孔型槽底宽度由102mm修改为110.61mm；(2)孔型槽口宽度由142mm修改为147mm；(3)孔型4个圆角R由10mm修改为35mm；(4)取消18°侧壁斜角；粗轧机第3架孔型优化设计为大圆弧倒角孔型，增加金属变形流动性，杜绝圆钢表面产生褶皱质量缺陷。优化粗轧机组第3架孔型设计，避免红坯变形不均匀导致其表面产生褶皱性成簇裂纹。由于开轧温度的降低，轧件在孔型中的变形抗力增加，尤其是方坯的角部温降比较快，轧件的塑性降低很大，在剧烈的变形中容易造成圆钢的褶皱开裂。故将3架的孔型设计进行修订。由图1优化设计为图2；
调整轧制节奏，其轧制间隔30-35S，与钢坯加热、定尺剪切保持同步连续稳定生产。 生产常规品种轧制节奏间隔是2-5S，生产耐硫酸腐蚀圆钢轧制节奏设计为30-35S，是与低温慢烧加热工艺、冷床接钢布料工序、定尺剪切温度控制相匹配，该发明化学成分设计含铜元素，铜熔点温度是1083℃，为防止铜元素溶解弱化晶界，故设计二加热段温度1000-1070℃，均热段温度1020-1060℃；又因该钢种含铬、锑等合金元素，低温加热需通过延长加热时间，使合金元素充分扩散不偏聚，本专利设计加热时间90-100min，比常规钢种延长30min，轧制节奏控制30-35S，可与加热时间相匹配，保证生产连续性和稳定性。
调整粗轧机组轧辊轧槽额定吨位：由于开轧温度的降低，轧件对轧槽的磨损加剧，轧槽老化加剧，轧辊表面产生麻坑或龟裂纹，经加热后坯料在轧制过程中，因耐蚀钢设计为低碳包晶钢，钢质偏软，故钢坯表面与轧辊接触，经多架次上下与左右轧制，经轧卡实验验证中间架次红坯表面存在成簇裂纹，圆钢表面形成目视可见的麻坑缺陷。调整轧槽过钢量吨位如表1所示。
表1 轧槽吨位调整
Figure PCTCN2021115467-appb-000002
根据实际情况轧槽过钢量不能高于最大吨位：降低粗轧机组轧槽过钢量，第1架4000吨，第2架4000吨，第3架4000吨，第4架4000吨，第5架2000吨，第6架2000吨。
优化设计生产Ф60mm圆钢的轧制工艺改进方案，有效解决了成品尾端局部凸起形成耳子缺陷的质量难题。达涅利设计生产Ф60mm圆钢工艺是6架粗轧加中轧机组第11架和第12架轧机，共8个轧制道次，因料型匹配不合理，致使圆钢尾端局部凸起形成耳子缺陷，采取多种措施均未能彻底解决。通过研究达涅利的设计原理，增加中轧机组第7架和第8架两台轧机，共10个轧制道次，重新分配10个轧制道次的压下量，使料型分布更均匀的轧制工艺方案，彻底解决了尾部耳子缺陷问题。
表1-1 Ф60mm圆钢的创新性轧制工艺方案
轧机 1#架 2#架 3#架 4#架 5#架 6#架 7#架 8#架 11#架 12架
改进前 175*120 137.5*118 140*88 105*105 118.3*62.9 76*76     82.5*54.3 60.5*60.5
改进后 175*120 137.5*118 140*88 106*105 118.5*78.4 88.4*84 91.4*67 75.9*75.9 82.5*55.4 60.5*60.5
制定冷床布料冷却制度，减少圆钢表面在定尺剪切过程中产生划伤。冷床长度120米，宽度13.87米。轧制耐腐蚀圆钢规格Ф50mm—Ф70mm，属于中等规格热轧圆钢，设计冷床布料间隔4步(常规钢种冷床不空步)，保证每支倍尺圆钢在冷床上均匀冷却，确保定尺剪切温度要低于350℃，防止剪切过程中圆钢表面产生划伤。
制定缓冷工艺；耐腐蚀钢种含有Cr、Cu、Sb等合金元素，为使残余应力得到有效释放，避免端头剪切裂纹产生，采取圆钢成品进行48小时保温处理冷却工艺。
具体来说：1)本发明研制开发出布料制度和低温慢烧加热工艺，以减少Cu元素在钢表面的富集，避免圆钢产生“星状”裂纹；2)本发明优化粗轧机组孔型设计，避免红坯变形不均匀导致其表面产生褶皱性成簇裂纹；3)本发明开发出轧制节奏控制和轧机布局的优化工艺，解决圆钢尾部易产生耳印质量缺陷的问题；4)本发明采用陶瓷辊道新材料应用技术，避免圆钢表面划伤；5)本发明制定冷床布料冷却制度，减少圆钢表面在定尺剪切过程中产生划伤。
进一步来优选的，09CrCuSb耐硫酸露点腐蚀钢是低碳包晶钢，钢质偏软，生产线上运输辊道磨损、或红钢运行中与导槽接触等，圆钢表面都会产生划伤缺陷，由此开发应用耐磨新材料陶瓷辊道。过钢量是传统辊道20倍，杜绝辊道磨损对圆钢表面造成划伤。
综上所述，一种耐硫酸露点腐蚀热轧圆钢的生产工艺，主要的控制难点是含铜钢易产生“Cu”偏聚导致圆钢表面形成星状裂纹质量缺陷，传统工艺是采用化学成分设计 添加镍合金，热轧圆钢扒皮成光亮材交货的工艺路线。本发明是不加镍合金的耐蚀钢生产工艺，并用黑皮交货热轧材代替光亮材，节约了合金成本，提高了圆钢的成材率，在提高经济效益的同时实现了资源的节约。生产工艺需要严格控制各个环节工艺参数，工艺环节相互影响，必须全部实现才能保证最终产品质量。
实施例1
牌号：09CrCuSb，规格：Ф50mm、Ф65mm，轧制季节：冬季。
150mm×150mm连铸方坯检验→上料→加热炉→高压水除鳞→粗轧机组→1#剪切机剪头尾→中轧机组→测径仪→2#剪切机切倍尺→裙板辊道→冷床→定尺剪切→双辊道→三段链传输、检验→成品收集→打包→称重→标牌→缓冷→入库。
成品化学成分如表2所示，成分合格，符合内控要求。Φ50mm规格的铸坯尺寸为150×150×11350mm，Φ65mm规格的铸坯尺寸为150×150×11000mm。
表2 09CrCuSb圆钢化学成分(wt％)
09CrCuSb C Si Mn P S Cr Cu Sb Ni Fe
Φ50 0.09 0.34 0.51 0.013 0.006 0.91 0.30 0.07 0.04 余量
Φ65 0.09 0.30 0.50 0.009 0.004 0.93 0.31 0.07 0.03 余量
钢坯进行三段加热处理，其中Φ50mm规格生产时，钢坯平均在炉时间约100min，加热制度为：预热段温度760-790℃，加热段温度1040-1060℃，均热段温度为1050-1070℃；Φ65mm规格钢坯平均在炉时间约120min，各段加热温度为：预热段温度800-830℃，加热段温度1050-1070℃，均热段温度为1060-1080℃，调试期间均热段温度降为1000-1020℃。
在轧制工序，Φ50mm规格开轧温度为1020-1040℃，Φ65mm规格开轧温度为1030-1050℃。
金相检验后，两种规格金相组织均正常，为正常铁素体+珠光体，两种规格实际晶粒度大小相差不大，实际晶粒度为7.5级，说明下线保温效果良好。
成品气体含量结果如表3所示，经检验气体含量，符合内控要求，控制良好。
表3 成品气体含量
09CrCuSb N/ppm H/ppm O/ppm
Φ50 52 2.0 12
Φ65 47 1.5 13
内控 60 2 20
成品非金属夹杂物检验，如表4所示，经检验，控制水平符合内控要求。
表4 非金属夹杂物
Figure PCTCN2021115467-appb-000003
外形尺寸测量及目视检验表面质量见表5所示。其中Φ65mm规格表面划伤比较多，有11条划伤，最深有0.20mm，且表面有肉眼可见龟裂，龟裂为不规则形裂纹，裂纹最深0.20mm，裂内有氧化物，裂纹周围有氧化圆点，经能谱检测存在Cu元素偏析；Φ50mm规格表面划伤较少，边缘有裂纹，裂纹最深0.15mm，裂内有氧化物，裂纹周围有氧化圆点。
表5 外形尺寸及表面质量
规格 直径/mm 不圆度/mm 弯曲度/mm/m 表面质量 酸洗质量
Φ50 49.8-50.2 0.4 0.30 存在划伤 良好
Φ50内控 49.3-50.7 ≦1.05 ≦4    
Φ65 64.8-65.3 0.5 0.25 存在划伤 龟裂
Φ65内控 64.1-65.9 ≦1.35 ≦4    
圆钢的横截面酸浸后，低倍组织上不能有目视可见的缩孔、气泡、裂纹、夹杂、白点、翻皮、分层等缺陷。允许出现的缺陷为中心疏松、一般疏松和偏析，合格级别应分别不大于2.0级。低倍组织检验结果如表6所示，符合低倍组织要求。
表6 09CrCuSb圆钢低倍组织情况
缺陷 缩孔 气泡 裂纹 夹杂 白点 翻皮 分层 中心疏松 一般疏松 偏析
级别 0 0 0 0 0 0 0 0 0 0
实施例2
牌号：09CrCuSb，规格：Ф50mm、Ф65mm，轧制季节：春季。
150mm×150mm连铸方坯检验→上料→加热炉→高压水除鳞→粗轧机组→1#剪切机剪头尾→中轧机组→测径仪→2#剪切机切倍尺→裙板辊道→冷床→定尺剪切→双辊道→三段链传输、检验→成品收集→打包→称重→标牌→缓冷→入库。
成品化学成分如表7所示，成分合格，符合内控要求。Φ50mm规格的铸坯尺寸为150×150×11350mm，Φ65mm规格的铸坯尺寸为150×150×11000mm。
表7 09CrCuSb圆钢化学成分(wt％)
09CrCuSb C Si Mn P S Cr Cu Sb Ni Fe
Φ50 0.08 0.32 0.54 0.012 0.005 0.90 0.31 0.07 0.03 余量
Φ65 0.08 0.30 0.52 0.008 0.005 0.92 0.32 0.07 0.03 余量
钢坯进行三段加热处理，加热制度为：预热段温度750-800℃，加热段温度1000-1030℃，均热段温度为1020-1040℃，钢坯加热段加热时间为90-100min，均热段加热时间为32min，在保证轧制正常的前提下，实际温度控制均热段为中下限。
高压水除鳞压力14.5Mpa。
在轧制工序，在轧钢工序，依据所需产品尺寸制度合理的轧制工艺，严格按照轧制制度控制红坯尺寸，保证圆钢表面质量，轧制节奏控制在30S，保证剪切温度，陶瓷辊道传输有效减少圆钢表面划伤；圆钢成品进行48小时保温处理，避免剪切裂纹。
金相组织为正常组织铁素体+珠光体，未出现异常组织，划伤深度控制在0.15mm以下。
成品气体含量结果如表8所示，经检验气体含量，符合内控要求，控制良好。
表8 成品气体含量
09CrCuSb N/ppm H/ppm O/ppm
Φ50 59 1.5 16
Φ65 61 1.3 14
内控 ≤60 ≤2 ≤20
通过对圆钢进行检测，夹杂物水平如表9，可以看出，09CrCuSb夹杂物各项指标均较低。
表9 夹杂物水平
Figure PCTCN2021115467-appb-000004
外形尺寸及表面质量如表10所示，控制符合协议要求，圆钢表面质量得到明显改善，消除了星状龟裂，经能谱检测表面未发现Cu元素偏析。
表10 外形尺寸及表面质量
规格/mm 直径/mm 不圆度/mm 弯曲度/mm/m 表面质量 酸洗质量
Φ50 49.8-50.1 0.4 0.25 良好 良好
Φ50内控 49.3-50.7 ≦1.05 ≦4    
Φ65 64.9-65.4 0.5 0.17 良好 存在浅划伤
Φ65内控 64.1-65.9 ≦1.35 ≦4    
表11连铸坯低倍组织检验中，除有0.5级的中心疏松、偏析缺陷外，其它缺陷均未出现，铸坯实物质量良好。圆钢低倍检测组织均为0级，控制良好。
表11 09CrCuSb连铸方坯低倍组织情况
Figure PCTCN2021115467-appb-000005
实施例3
牌号：09CrCuSb，规格：Ф50mm、Ф60mm，轧制季节：夏季。
150mm×150mm连铸方坯检验→上料→加热炉→高压水除鳞→粗轧机组→1#剪切机剪头尾→中轧机组→测径仪→2#剪切机切倍尺→裙板辊道→冷床→定尺剪切→双辊道→三段链传输、检验→成品收集→打包→称重→标牌→缓冷→入库。
成品化学成分如表12所示，成分合格，符合内控要求。Φ50mm规格的铸坯尺寸为150×150×11350mm，Φ65mm规格的铸坯尺寸为150×150×11000mm。
表12 09CrCuSb圆钢化学成分(wt％)
09CrCuSb C Si Mn P S Cr Cu Sb Ni Fe
Φ50 0.08 0.34 0.52 0.014 0.008 0.91 0.30 0.08 0.03 余量
Φ65 0.09 0.31 0.51 0.010 0.006 0.93 0.32 0.07 0.04 余量
钢坯进行三段加热处理，加热制度为：预热段温度750-800℃，加热段温度1000-1030℃，均热段温度为1020-1040℃，钢坯加热段加热时间为90-100min，均热段加热时间为34min，在保证轧制正常的前提下，实际温度控制均热段为中下限。
高压水除鳞压力14.5Mpa。
表13 Ф60mm圆钢的轧制工艺
Figure PCTCN2021115467-appb-000006
在轧制工序，在轧钢工序，依据所需产品尺寸制度合理的轧制工艺，严格按照轧制制度控制红坯尺寸，保证圆钢表面质量，轧制节奏控制在32S，保证剪切温度，陶瓷辊道传输有效减少圆钢表面划伤；圆钢成品进行48小时保温处理，避免剪切裂纹。
金相组织为正常组织铁素体+珠光体，未出现异常组织，划伤深度控制在0.16mm以下。
成品气体含量结果如表13所示，经检验气体含量，符合内控要求，控制良好。
表14 成品气体含量
09CrCuSb N/ppm H/ppm O/ppm
Φ50 56 1.3 18
Φ60 59 1.4 16
内控 ≤60 ≤2 ≤20
通过对圆钢进行检测，夹杂物水平如表14，可以看出，09CrCuSb夹杂物各项指标均较低。
表15 夹杂物水平
Figure PCTCN2021115467-appb-000007
外形尺寸及表面质量如表15所示，控制符合协议要求，圆钢表面质量得到明显改善，消除了星状龟裂
表16 外形尺寸及表面质量
规格/mm 直径/mm 不圆度/mm 弯曲度/mm/m 表面质量 酸洗质量
Φ50 49.8-50.1 0.5 0.27 良好 良好
Φ50内控 49.3-50.7 ≦1.05 ≦4    
Φ60 59.7-60.2 0.4 0.16 良好 存在浅划伤
Φ60内控 59.3-60.7 ≦1.35 ≦4    
表17连铸坯低倍组织检验中，除有0.5级的中心疏松、偏析缺陷外，其它缺陷均未出现，铸坯实物质量良好，圆钢低倍组织均为0级。
表17 09CrCuSb连铸方坯低倍组织情况
Figure PCTCN2021115467-appb-000008
本发明设计了可行的09CrCuSb耐硫酸露点腐蚀管坯用钢的工艺路线，加入Cr、Cu、Sb等合金元素，使用150mm×150mm方坯，三段式加热炉钢坯低温慢烧加热工艺，优化了粗轧机组第3架孔型设计，将Ф60mm规格圆钢轧制道次由8道次改为10道次，重新 计算各道次压下量，控制轧制节奏为30S-35S，生产出的09CrCuSb耐硫酸露点腐蚀管坯用钢化学成分稳定，磷、硫等元素含量低，非金属夹杂物控制较好，铸坯质量良好，性能良好，完全满足相关标准要求。并经过下游客户的使用和专门耐酸性检验机构的检测，该钢种的耐硫酸性能优良。
以上所述的实施例仅用于说明本发明的技术思想及特点，其目的在于使本领域内的技术人员能够理解本发明的内容并据以实施，不能仅以本实施例来限定本发明的专利范围，即凡本发明所揭示的精神所作的同等变化或修饰，仍落在本发明的专利范围内。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (2)

  1. 一种耐硫酸露点腐蚀热轧圆钢09CrCuSb的生产工艺，圆钢09CrCuSb的化学成分按重量百分比计，C＝0.06-0.09％，Si＝0.26-0.38％，Mn＝0.48-0.60％，Cr＝0.90-1.00％，Cu＝0.30-0.40％，Sb＝0.07-0.09％，P≤0.015％，S≤0.008％，Ni≤0.15％，N≤0.0060％，H≤0.0002％，O≤0.0020％，其余为平衡量的Fe；其特征在于：上述圆钢的工艺路线依次为：150mm×150mm连铸方坯检验、加热炉、铸坯布料、高压水除鳞、粗轧机组、1#剪切机剪头尾、中轧机组、测径仪、2#剪切机切倍尺、裙板辊道、冷床、定尺剪切、双辊道、三段链传输、检验、成品收集、打包、称重、标牌、缓冷、入库；其特征在于：
    其中；铸坯布料：坯料在加热炉内与前一个钢种需空步15步，与后一个钢种需空步10步，防止Cu元素液化析出；
    加热炉：采用三段式加热，低温慢烧工艺控制，钢坯尺寸为150mm×150mm，钢坯加热工序采用一加热段温度≤850℃，二加热段温度1000-1070℃，均热段温度1020-1060℃；总加热时间为90-100min，均热段加热时间不大于35min；
    高压水除鳞：保证除鳞压力不小于14.5MPa；
    粗轧机组：调整粗轧机组的第3架孔型；
    (1)孔型槽底宽度由102mm修改为110.61mm；
    (2)孔型槽口宽度由142mm修改为147mm；
    (3)孔型4个圆角R由10mm修改为35mm；
    (4)取消18°侧壁斜角；
    调整轧制节奏：轧制节奏间隔调整为30S-35S，与钢坯加热、定尺剪切保持同步连续稳定生产；
    调整粗轧机组轧辊轧槽额定吨位：在现有的粗轧机组轧辊轧槽额定吨位的基础上降低每个架次的粗轧机组轧辊轧制额定吨位；具体为：
    粗轧架次 1架/吨 2架/吨 3架/吨 4架/吨 5架/吨 6架/吨 调整吨位 8000 8000 7000 7000 6000 6000
    调整Ф60mm圆钢的轧制工艺：在现有8个轧制道次增加中轧机组第7架和第8架两台轧机，共10个轧制道次，重新分配10个轧制道次的压下量，使料型分布均匀；
    轧机 1#架 2#架 3#架 4#架 5#架 6#架 7#架 8#架 11#架 12架 压下量 175*120 137.5*118 140*88 106*105 118.5*78.4 88.4*84 91.4*67 75.9*75.9 82.5*55.4 60.5*60.5
    调整冷床布料：制定冷床布料冷却制度，减少圆钢表面在定尺剪切过程中产生划伤；冷床长度120米，宽度13.87米；轧制耐腐蚀圆钢规格Ф50mm—Ф70mm，属于中等规格热轧圆钢，设计冷床布料间隔4步，保证每支倍尺圆钢在冷床上均匀冷却，确保定尺剪切温度低于350℃，防止剪切过程中圆钢表面产生划伤；
    调整缓冷工艺：为控制定尺剪切过程中圆钢表面产生划伤质量缺陷，冷床布料进行重新设计，工艺要求剪切温度低于350℃，但09CrCuSb圆钢含多种合金元素，为有效释放组织应力，需进行堆冷，线下缓冷工艺温度≥250℃，因此，圆钢定尺剪切后，剪后辊道和三段链运行速度是常规产品1.2倍，进行快速收集，确保满足缓冷工艺温度要求；下线圆钢成品执行48小时保温处理的冷却工艺。
  2. 根据权利要求1所述的耐硫酸露点腐蚀圆钢09CrCuSb的生产工艺，其特征在于：所述辊道采用耐磨陶瓷辊道。
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