Acicular ferritic steel for low-manganese high-chromium anti-hic pipeline and manufacturing method thereof

A technology for ferritic steel and a manufacturing method, applied in the field of ferritic steel, can solve the problems of not significantly increasing the cost, and achieve the effects of reduced steelmaking process requirements, good matching of strength and toughness, and uniform structure

Active Publication Date: 2017-06-13
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a low-manganese, high-chromium, HIC-resistant acicular ferritic steel and its manufacturing method, which solves the problem of producing pipelines with excellent mechanical properties and better HIC resistance without significantly increasing the cost. The problem with steel

Method used

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  • Acicular ferritic steel for low-manganese high-chromium anti-hic pipeline and manufacturing method thereof
  • Acicular ferritic steel for low-manganese high-chromium anti-hic pipeline and manufacturing method thereof
  • Acicular ferritic steel for low-manganese high-chromium anti-hic pipeline and manufacturing method thereof

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Embodiment 1

[0025] According to the chemical composition range requirements of acicular ferritic steel for low manganese and high chromium anti-HIC pipelines, molten steel smelting, billet casting and steel plate rolling are completed; billet size: 300mm thick*1620mm wide*3000mm long steel plate size: 19.3mm Thickness*1848mm width*12050mm length, 3 fixed lengths. The chemical composition percentages are shown in Table 1:

[0026] Table 1 embodiment actual chemical composition (%)

[0027] C Si mn Cr Nb Ti P S Alt N Ca 0.038 0.33 0.35 0.85 0.06 0.016 0.011 0.0067 0.034 0.0055 0.0030

[0028] 1. The reference liquidus temperature is 1521°C: converter tapping is 1655°C; LF end is 1638°C; RH end is 1589°C; soft blowing end temperature is 1562°C; tundish temperature is 1538°C.

[0029] 2. Continuous casting process of 300mm thick continuous casting slab: casting speed: 0.78m / min, low magnification central segregation of slab C class 0.5.

[0030] 3...

Embodiment HI

[0034] Table 3 Example HIC performance (%)

[0035] Section number CLR CTR CSR 1 6.13％ 5.31％ 0.325％ 2 0 0 0 3 0 0 0 average value 2.04％ 1.77％ 0.108％

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Abstract

The invention discloses acicular ferrite steel for a low-manganese high-chromium anti-HIC (hydrogen induced cracking) pipeline and a manufacturing method for the acicular ferrite steel, and belongs to the technical field of ferrite steel. The acicular ferrite steel comprises the following chemical components in percentage by weight: 0.03%-0.05% of C, 0.30%-0.50% of Si, 0.30%-0.50% of Mn, 0.50%-1.20% of Cr, 0.015%-0.050% of Alt, 0.050%-0.080% of Nb, 0.010%-0.020% of Ti, 0.0020%-0.0040% of Ca, less than or equal to 0.012% of P, less than or equal to 0.0080% of S, less than or equal to 0.0060% of N, and the balance of Fe and inevitable impurities. The manufacturing method is completed by a smelting process comprising molten iron desulfurization and slagging-off, converter smelting, LF furnace refining, RH vacuum treatment, plate blank casting, plate blank heating, steel plate rolling and ACC laminar cooling. The acicular ferrite steel has the advantages of excellent mechanical properties and excellent anti-HIC properties.

Description

technical field [0001] The invention belongs to the technical field of ferritic steel, in particular to acicular ferritic steel for low manganese and high chromium anti-HIC pipelines and a manufacturing method thereof. Background technique [0002] As the demand for oil and gas continues to increase, in order to increase its transmission efficiency, the pipeline transmission pressure also increases accordingly. H in my country's oil and gas 2 The S content is generally low, and when the delivery pressure is low, it can be used as sweet gas after desulfurization (P H2S ≤300Pa) use. When the gas delivery pressure increases, if the H 2 Partial pressure P of S H2S ≤300Pa, then H must be reduced 2 The input concentration of S, which brings great difficulties to the desulfurization treatment. h 2 There are two main forms of S corrosion: hydrogen induced cracking (Hydrogen Induced Cracking-HIC) and stress corrosion cracking (Stress Corrosion Cracking-SCC). This paper focuse...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/18C22C38/04C22C38/02C22C38/06C22C38/12C22C38/14C22C33/06C21D8/02
CPCC21D6/002C21D8/0226C21D8/0263C21D2211/005C22C33/06C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/18
Inventor 宋欣谌铁强王传财蔡建伟白松莲万潇张学峰董占斌刘永利周希楠周德光赵久梁
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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