High-toughness ferrite type hot continuous rolling steel band for oil-gas pipeline and production method of high-toughness ferrite type hot continuous rolling steel band

A production method, ferrite technology, applied in the field of hot continuous rolling steel plate production, can solve the problems of large amount of alloy addition, production method not suitable for ordinary ferritic pipeline steel, strict requirements on equipment and production conditions, etc., and achieve excellent low temperature The effect of toughness

Inactive Publication Date: 2019-01-11
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of pipeline steel has a large amount of alloy addition, strict requirements on the quality of the cast slab, requires the use of low-temperature c

Method used

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  • High-toughness ferrite type hot continuous rolling steel band for oil-gas pipeline and production method of high-toughness ferrite type hot continuous rolling steel band
  • High-toughness ferrite type hot continuous rolling steel band for oil-gas pipeline and production method of high-toughness ferrite type hot continuous rolling steel band
  • High-toughness ferrite type hot continuous rolling steel band for oil-gas pipeline and production method of high-toughness ferrite type hot continuous rolling steel band

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Experimental program
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Effect test

Embodiment 1

[0049] Hot metal pretreatment, converter smelting, LF heating furnace refining, RH vacuum refining, continuous casting to obtain a 220mm thick billet, the specific chemical composition weight percentage is: 0.05C, 0.17Si, 1.32Mn, 0.036Nb, 0.01P, 0.002S, 0.036 Nb, 0.2Cr, 0.09Mo, 0.12Ni, 0.016Ti, 0.033Als, and the rest are Fe and unavoidable impurities; the reheating temperature of the billet is 1192°C, and the furnace time is 245min. Secondary reduction rate is 15%, 19%, 20%, 22%, 22%, 27%, rolling to 54mm; finishing rolling is 7-stand hot continuous rolling, finishing rolling start temperature is 970°C, finish rolling temperature is 780°C, the thickness of the billet after finish rolling is 8.8mm; cooling to 450°C at a cooling rate of 30°C / s, air cooling for 2s, and then cooling to 397°C at a cooling rate of 13°C / s for coiling.

[0050] After testing, the mechanical properties of the pipeline steel produced in this embodiment are: Rt0.5: 537MPa, Rm: 615MPa, A50: 30.0%, Rt0.5 / R...

Embodiment 2

[0052]Hot metal pretreatment, converter smelting, LF heating furnace refining, RH vacuum refining, continuous casting to obtain a 230mm thick billet, the weight percentage of the specific chemical composition is: 0.05C, 0.15Si, 1.31Mn, 0.011P, 0.003S, 0.034Nb, 0.19, Cr, 0.11Mo, 0.13Ni, 0.018Ti, 0.031Als; the billet reheating temperature is 1197°C, the time in the furnace is 205min, the rough rolling adopts 6-pass rolling, and the reduction rate of each pass is 15%, 16% , 18%, 21%, 26%, 29%, rolled to 56mm; the finish rolling is 7-stand hot continuous rolling, the finish rolling start temperature is 959°C, the finish rolling temperature is 778°C, and the billet thickness after finish rolling is 7.9mm; Cool to 502°C at a cooling rate of 23°C / s, air-cool for 1s, and then cool to 492°C at a cooling rate of 11°C / s for coiling.

[0053] After testing, the mechanical properties of the pipeline steel produced in this embodiment are: Rt0.5: 542MPa, Rm: 611MPa, A50: 33.5%, Rt0.5 / Rm: 0.8...

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Abstract

The invention discloses a high-toughness ferrite type hot continuous rolling steel band for an oil-gas pipeline and a production method of the high-toughness ferrite type hot continuous rolling steelband, and relates to the technical field of hot continuous rolling steel plate production. The adding quantity of alloy elements is small, and the process adaptability is high. Rolled steel of the high-toughness ferrite type hot continuous rolling steel band for the oil-gas pipeline is prepared from chemical components in percent by weight: 0.04-0.09% of C, smaller than or equal to 0.30% of Si, 1.20-1.70% of Mn, smaller than or equal to 0.016% of P, smaller than or equal to 0.005% of S, smaller than or equal to 0.05% of Nb, smaller than or equal to 0.25% of Cr, smaller than or equal to 0.20% of Mo, smaller than or equal to 0.04% of Ti, smaller than or equal to 0.06% of Als and the balance Fe and inevitable impurities. The mean grain size of the rolled steel of the steel band is not smallerthan the 12 level. The metallographic structure of the rolled steel of the steel band is a needle-like ferrite phase and a small amount of pearlite. The production method of the steel band includes the procedures of pre-desulfurization, LF furnace refining, RH furnace refining, 5-6 passes of rough rolling, 6-7 passes of finish rolling, cooling and reeling.

Description

technical field [0001] The invention relates to the technical field of hot-rolled steel plate production, in particular to a hot-rolled steel strip for high-toughness ferritic oil-gas pipelines and a production method thereof. Background technique [0002] Low-temperature toughness is an important indicator of the mechanical properties of steel series products for oil and gas pipelines. Failure to meet the requirements for low-temperature toughness may lead to brittle failure of oil and gas pipelines during use, causing sudden accidents and affecting personal and property safety. The low-temperature impact performance is characterized by the ability of the material to inhibit the formation of cracks. The banded structure, inclusions, or uneven material structure formed in the steel may reduce the low-temperature impact toughness. [0003] In recent years, as the service conditions of oil and gas pipelines have become more and more harsh, various severe weather and geological...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/38C22C38/26C22C38/22C22C38/28C22C38/06C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0247C21D2211/005C22C38/02C22C38/04C22C38/06C22C38/22C22C38/26C22C38/28C22C38/38
Inventor 熊雪刚张开华叶晓瑜肖尧
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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