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Manufacturing method of thick-wall and large-caliber high-grade pipeline steel

A manufacturing method and large-diameter technology, applied in the field of metallurgy, can solve problems such as the manufacturing method of thick-walled, large-diameter, and high-grade pipeline steel that does not meet the requirements, and achieve the effects of superior performance, improved purity, and improved purity

Inactive Publication Date: 2016-12-14
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] With the gradual deterioration of the competitive pressure of iron and steel enterprises, customers have more and more urgent demands for large-wall and large-diameter pipeline products. Breaking through technical barriers and developing high-end products play a key role in the survival and development of enterprises. At present, domestic There is no method for manufacturing thick-walled large-diameter high-grade pipeline steel that meets the requirements

Method used

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  • Manufacturing method of thick-wall and large-caliber high-grade pipeline steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] After passing the RH vacuum, feed the seamless pure calcium cored wire to allow the inclusions to fully calcify and float up; for the 320mm wide-section crystallizer, use five-hole nozzles instead of two-hole nozzles to ensure the stability of the flow field and eliminate the need to take gas in the crystallizer This ensures the stability of the casting area. The continuous casting adopts a constant casting speed of 0.6m / s, and the superheat is stable between 8 and 15 degrees. It has obtained the national standard C0.5 of the cast slab low rating rating, and provides good raw materials for rolling;

Embodiment 2

[0030] The slab number 1430667408 is actually rolled in 7 passes of rough rolling and 7 passes of finish rolling. Requirements for pass reduction rate of austenite grains, the average shear area of ​​the steel plate drop weight test is 88%;

[0031] Implementation column 3

[0032] Slab No. 1420648503 Tapping temperature 1186°C, heating time 369min, rough rolling start temperature 1050°C, finish rolling temperature 836°C, final rolling 792°C, rough rolling end to reduction rate 21.03%, water inlet temperature 736°C, final cooling The temperature is 363°C, the cooling rate is 18°C / s, and the physical and chemical properties of the steel plate meet customer requirements;

[0033] Implementation column 4

[0034] The slab number 1420648605 has a tapping temperature of 1178°C, a heating time of 356min, a rough rolling start temperature of 1039°C, a finish rolling temperature of 842°C, a final rolling temperature of 806°C, a reduction ratio of 21.03% from the end of rough rolling...

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Abstract

The invention discloses a manufacturing method of thick-wall and large-caliber high-grade pipeline steel. The purity of molten steel is improved through calcium treatment process improvement, five-hole water port use and middle ladle sampling position optimization; the macrostructure of a casting blank is improved through low-temperature and constant-pulling-speed casting; the heating temperature of the casting blank is reasonably selected to set open rolling temperatures in the first phase and the second phase; the reasonable final rolling temperature guarantees different deformation storage energy and grain boundary migration rates; organization grains are effectively refined through the final rolling temperature; the water feeding temperature, the final cooling temperature and the cooling speed are reasonably matched to guarantee fine ferrite structures and to guarantee strength and toughness of steel plates; and a reasonable reduction schedule guarantees the stability of structures and performances to satisfy the performance requirements of the thick-wall and large-caliber pipeline steel.

Description

technical field [0001] The invention belongs to the field of metallurgy, and relates to a production method of φ1219×33mm thick-walled large-diameter pipeline steel, in particular to a production method of thick-walled large-diameter high-grade pipeline steel. Background technique [0002] With the gradual deterioration of the competitive pressure of iron and steel enterprises, customers have more and more urgent demands for large-wall and large-diameter pipeline products. Breaking through technical barriers and developing high-end products play a key role in the survival and development of enterprises. At present, domestic There is no method for manufacturing thick-walled large-diameter high-grade pipeline steel that meets the requirements. Contents of the invention [0003] The purpose of the present invention is to provide a method for manufacturing thick-walled, large-diameter, and high-grade pipeline steel. The method adopts: the improvement of the calcium treatment p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/14C22C38/06C22C38/16C22C38/08C22C38/18C21D8/02
CPCC22C38/04C21D8/0226C21D2211/005C22C38/002C22C38/02C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18
Inventor 翟冬雨姜金星员强鹏
Owner NANJING IRON & STEEL CO LTD
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