Method for manufacturing corrosion-resistant pipeline pipe for high-acid environment
A manufacturing method and anti-corrosion technology, which is applied in the field of seamless steel pipes, can solve problems such as the difficulty of having hydrogen sulfide stress corrosion cracking resistance, and achieve good uniformity
Inactive Publication Date: 2019-12-20
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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Problems solved by technology
Existing anti-corrosion line pipes for sour oil and gas environments are difficult to have ideal anti-hydrogen sulfide stress corrosion cracking performance
Method used
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Embodiment
[0014] Utilize the L360QS seamless steel pipe manufactured by the present invention, two example chemical compositions are as follows:
[0015] example C Si mn P S Alt Nb V Pcm CE 1 0.11 0.26 1.12 0.005 0.001 0.038 0.037 0.06 0.18 0.31 2 0.10 0.25 1.2 0.006 0.001 0.040 0.032 0.07 0.17 0.30
[0016] Among them, in terms of rolling temperature, the qualified steel ingot in Example 1 is heated by a heating furnace, and forged and rolled into a φ273*11mm steel pipe. Heating furnace heating temperature control: example 1 is 1220±5°C, example 2 is 1230±5°C, finish rolling temperature control is: example 1 is 810±5°C, example 2 is 830±5°C.
[0017] As far as heat treatment is concerned, the normalizing plus tempering heat treatment process is adopted, and the normalizing temperature control conditions are as follows: Example 1 is normalizing 920±5°C, tempering is 660±5°C, and Example 2 is 680±5°C.
[0018] Mechanical propertie...
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Abstract
The invention relates to the field of seamless steel pipes, in particular to a method for manufacturing a corrosion-resistant pipeline pipe with stronger hydrogen sulfide stress corrosion cracking resistance for a high-acid environment. The method comprises the following steps that a, firstly, molten steel is smelted, wherein the molten steel is prepared from the following components in percentageby mass: 0.08-0.14% of C, 0.20-0.45% of Si, 1.0-1.4% of Mn, 0.03-0.05% of Nb, 0.05-0.08% of V, less than or equal to 0.010% of P, less than or equal to 0.002% of S, and the balance Fe and impurities,meanwhile, the cold crack coefficient Pcm is controlled to be less than or equal to 0.22%, and the carbon equivalent CEV is controlled to be less than or equal to 0.39%; b, the molten steel is made to form a steel ingot, and the steel ingot is heated; c, the steel ingot is rolled to obtain the corrosion-resistant pipeline pipe; and d, normalizing and tempering heat treatment are carried out, andfinally a product is obtained. According to the method, the corrosion-resistant pipeline pipe with stronger hydrogen sulfide stress corrosion cracking resistance for the high-acid environment can be obtained, all the mechanical indexes of the steel pipe meet the requirements, and the uniformity is good. The method is particularly suitable for a preparation process for the corrosion-resistant pipeline pipe for the high-acid environment.
Description
technical field [0001] The invention relates to the field of seamless steel pipes, in particular to a method for manufacturing anti-corrosion line pipes for high-acid environments. Background technique [0002] With the rapid increase of energy demand, it is imperative to develop high-pressure resistant, long-life and corrosion-resistant gas pipelines. Corrosion and material selection are the key to the development of sour oil and gas fields, especially sour natural gas fields. 2 The damage caused by corrosion under S conditions is often directly related to safety and environmental protection, and has become a bottleneck restricting the development of sour natural gas fields, especially the development of high sour natural gas fields. Among them, H 2 When the partial pressure of S is greater than or equal to 0.1MPa, it is a severely corrosive environment, and high hydrogen sulfide stress corrosion cracking (that is, a highly acidic environment) is a unique form of the most...
Claims
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IPC IPC(8): C21D1/18C21D1/28C21D6/00C21D8/10C21D9/08C22C33/04C22C38/02C22C38/04C22C38/06C22C38/12
CPCC21D1/18C21D1/28C21D6/005C21D6/008C21D8/105C21D9/08C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 宋令玺
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD