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Production method of acid-resistant pipeline steel

A production method and pipeline steel technology, applied in the field of metallurgy, can solve the problems of long production cycle, high cost, uneven structure, etc., and achieve the effects of reducing hardening effect, low production cost and short production cycle

Active Publication Date: 2021-01-15
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of controlled rolling is only suitable for the production of low-grade pipeline steel, and it is difficult to meet the requirements of high strength. The production method of TMCP is widely used, but the production under this process may have defects such as poor plate shape and uneven structure. Off-line quenching +Although the production method of tempering solves the above two shortcomings, the manufacturing cost is high, the production cycle is long, and it is not suitable for industrial production
[0004] Chinese patent CN108342655A discloses "a quenched and tempered acid-resistant pipeline steel and its manufacturing method".
[0005] Chinese patent CN110541109A announced "A seabed acid-resistant pipeline steel X60MOS and its production method", its chemical composition mass percentage is: C: 0.06%-0.08%, Mn: 1.40%-1.70%, and the carbon content is relatively high , directly affects the anti-HIC performance, and the mass fraction of Mn is also high, which is easy to form Mn segregation and banded structure, reducing the anti-HIC performance of the material
[0006] Chinese patent CN108893678A announced "A kind of acid-resistant pipeline steel and its rolling method". The chemical composition and mass percentage of the invention are C: 0.014%~0.024%, Mn: 0.60%~0.80%, and the mass fractions of carbon and manganese are both low , is only suitable for the production of low-grade acid-resistant pipeline steel, and it is difficult to meet the strength requirements of high-grade acid-resistant pipeline steel. At the same time, the production process of this invention is TMCP, which is quite different from the online quenching of the present invention, and the cooling effect and uniformity are not as good as the present invention. it is good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Production of 9.5mmX65MS tempered pipeline steel

[0020] Steel smelting chemical composition content C=0.04%, Si=0.20%, Mn=1.18%, P=0.009%, S=0.0001%, Alt=0.026%, Nb=0.042%, Ti=0.014%, Mo=0.08% , Ni=0.13%, Cu=0.17%, Pcm=0.14%, the balance is Fe and unavoidable impurities.

[0021] (1) Heating: Furnace temperature 1100~1260°C, gas flow rate 4250Nm3 / h~4450 Nm3 / h, air-fuel ratio 1.16, furnace pressure 4Pa, total time in the furnace 286min, heating speed 6min / cm, furnace core temperature 1228°C.

[0022] (2) Rough rolling: the intermediate billet is set to 65mm, and the cumulative reduction rate is 73.1%. Longitudinal rolling is adopted to expand the width. %, 24.3%, 28.9%, and the rolling temperature is controlled at 1100~980°C.

[0023] (3) Finish rolling: the starting rolling temperature is 960°C, the cumulative reduction rate is 85.4%, the single pass reduction rate is 15%~20%, the rolling speed is 4~6m / s, and the final rolling temperature is 820~860°C.

...

Embodiment 1

[0026] Example 1 The mechanical properties of 9.5mmX65MS tempered pipeline steel are shown in Table 1.

[0027] Table 1 Mechanical properties of 9.5mmX65MS tempered pipeline steel

[0028]

Embodiment 2

[0029] Example 2: Production of 25.4mmX65MS tempered pipeline steel

[0030] Steel smelting chemical composition content C=0.03%, Si=0.22%, Mn=1.16%, P=0.008%, S=0.0001%, Alt=0.024%, Nb=0.043%, Ti=0.016%, Mo=0.09% , Ni=0.13%, Cu=0.16%, Pcm=0.13%, the balance is Fe and unavoidable impurities.

[0031] (1) Heating: furnace temperature 1100~1260℃, gas flow 4250Nm3 / h~4500 Nm3 / h, air-fuel ratio 1.21, furnace pressure 3.5Pa, total time in the furnace 292min, heating speed 6.2min / cm, furnace core temperature 1216 ℃.

[0032] (2) Rough rolling: the intermediate billet is set to 80mm, and the cumulative reduction rate is 69.2%. Longitudinal rolling is adopted to expand the width. %, 23.6%, 26.8%, and the rolling temperature is controlled at 1100~980°C.

[0033] (3) Finish rolling: the starting rolling temperature is 920°C, the cumulative reduction rate is 68.25%, the single pass reduction rate is 13%~20%, the rolling speed is 3.5~5.5m / s, and the final rolling temperature is 810~850°...

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Abstract

The invention relates to a production method of acid-resistant pipeline steel. The steel comprises the following chemical components in percentage by mass: 0.02-0.04%of C, 0.15-0.35% of Si, 1.10-1.25%of Mn, less than or equal to 0.010% of P, less than or equal to 0.0015% of S, 0.020-0.045% of Alt, 0.015-0.045% of Nb, 0.010-0.020% of Ti, 0.08-0.15% of Mo, 0.08-0.15% of Ni, 0.08-0.20% of Cu, less than or equal to 0.0005% of B, 0.12-0.14% of Pcm and the balance Fe and inevitable impurities. By adopting an online quenching and tempering process, a steel plate with thickness of 8-26.4 mm * 65MS isproduced, and the steel plate has high strength and ultra-strong low-temperature toughness, wherein the yield strength is 480-530 MPa, the tensile strength is 570-630 MPa, the elongation A50 is 35%-55%, the yield ratio is smaller than or equal to 0.88, the impact at 60 DEG C below zero is 300-400 J, and the drop hammer at 40 DEG C below zero is 85%-100%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to an on-line quenching + off-line tempering pipeline steel and a production method thereof. Background technique [0002] With the development of economy and the advancement of science and technology, the safety of pipes used in oil and gas transportation projects has been paid more and more attention. h 2 S is one of the harmful media in oil and gas transportation. The H atoms generated during the transportation process continuously penetrate into the steel, which is easy to corrode the pipeline and lead to hydrogen-induced cracking (HIC) of the pipeline, which can easily lead to pipeline safety accidents. Therefore, pipeline steel with HIC and SSCC resistance is more and more popular. At present, the oil and gas produced internationally are all degassed and directly transported through oil and gas pipelines. [0003] Acid-resistant pipeline steel for oil and gas engineering i...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C21D8/02C22C33/04
CPCC22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/08C22C38/16C22C38/002C22C33/04C21D8/0205C21D8/0226C21D8/0263C21D2211/001C21D2211/005
Inventor 杜江李中平张勇伟张成元彭宁琦史术华
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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