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Acidic corrosion-resistant X65 seamless steel pipeline and manufacturing method thereof

A technology for seamless line pipe and corrosion performance, applied in the field of corrosion-resistant materials and seamless steel pipes, can solve the problem of unrepresented SSC resistance, and achieve improved acid corrosion resistance, uniform grain structure, and good impact toughness. Effect

Inactive Publication Date: 2017-01-11
ANGANG STEEL CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

Both of the above two patents only pointed out the HIC resistance performance of steel grades, but did not express their SSC resistance performance.

Method used

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  • Acidic corrosion-resistant X65 seamless steel pipeline and manufacturing method thereof
  • Acidic corrosion-resistant X65 seamless steel pipeline and manufacturing method thereof
  • Acidic corrosion-resistant X65 seamless steel pipeline and manufacturing method thereof

Examples

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Embodiment Construction

[0029] The following examples are used to specifically illustrate the content of the present invention, and the comparative example is a common 20# steel pipe. The chemical compositions of the examples and comparative examples are shown in Table 1, the rolling and heat treatment methods are shown in Table 2, and the tensile and impact properties are shown in Tables 3 and 4. Example 1 The horizontal Vickers HV10 hardness of the steel pipe was measured at 4 points at the inner, middle and outer positions respectively, and the hardness results are shown in Table 5. The corrosion test is based on the requirements of the API 5L standard, and the HIC is tested by the NACE-0284-2003 standard A solution. It is generally believed that CLR≤15%, CTR≤5%, CSR≤2%, and the anti-HIC performance meets the requirements of the standard. Examples and comparison The HIC performance test results of the ratio are shown in Table 6. SSC corrosion test is according to ASTM G39-99 standard four-point b...

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Abstract

The invention discloses an acidic corrosion-resistant X65 seamless steel pipeline and a manufacturing method thereof. The acidic corrosion-resistant X65 seamless steel pipeline comprises, by weight, 0.08-0.16% of C, 0.15-0.35% of Si, 1.0-1.6% of Mn, 0.02-0.05% of Al, 0.03-0.049% of V, 0.01-0.04% of Ti, 0.20-0.30% of Cu, 0.20-0.30% of Ni, less than or equal to 0.015% of P and less than or equal to 0.005% of S. When C content is less than or equal to 0.12%, CE<Pcm> is less than or equal to 0.25 and when C content is greater than 0.12%, CE<IIW> is less than or equal to 0.42. According to the manufacturing method of the acidic corrosion-resistant X65 seamless steel pipeline, a continuous rolling method is used, a pipe blank is heated to a temperature of 1200-1300 DEG C through an annular furnace, a tube knockout temperature is in a range of 1190-1240 DEG C and a sizing temperature is in a range of 820-850 DEG C, in quenching and tempering treatment, a quenching heating temperature is in a range of 890-910 DEG C, a quenching medium is water, thermal insulation time is greater than or equal to 30min, a tempering temperature is in a range of 580-620 DEG C, thermal insulation time is greater than or equal to 50min, and heating straightening and flaw detection examination are carried out at a temperature greater than or equal to 400 DEG C.

Description

technical field [0001] The invention relates to the field of corrosion-resistant materials and seamless steel pipes, in particular to an X65 seamless pipeline steel pipe with anti-HIC and anti-SSC properties and a manufacturing method thereof. Background technique [0002] Acid corrosion is a key factor affecting the reliability and service life of pipeline transportation systems. In general, dry H 2 S gas is not corrosive to metal materials. At present, although the natural gas is purified before transportation, the treatment is not good, and the H in the natural gas 2 When the S content is high, the H 2 S corrosion is still inevitable. Wet hydrogen sulfide environments are generally referred to as acidic environments. Seamless Line Pipe Internal H 2 S corrosion is one of the main forms of corrosion, which is mainly caused by hydrogen induced cracking (HIC) and sulfide stress cracking (SSC). Among them, hydrogen-induced cracking means that the metal material is immers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16C21D8/10
Inventor 赵波王长顺解德刚陈克东郑云龙李道刚袁琴
Owner ANGANG STEEL CO LTD
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