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Anti-corrosion martensitic spiral submerged arc welded pipe and its preparation process

A technology of submerged arc welded pipe and martensite, which is applied in the direction of manufacturing tools, metal material coating technology, heat treatment equipment, etc., and can solve problems such as poor corrosion resistance

Inactive Publication Date: 2020-10-27
TIANJIN HAUYOU STEEL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of the martensitic seamless steel pipe increases the smoothness of the surface of the martensitic seamless steel pipe by improving the saponification solution, and reduces the phenomenon of pits and pits on the surface of the martensitic seamless steel pipe. However, due to the The preparation process of martensitic seamless steel pipe has not improved its corrosion resistance, and its corrosion resistance is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043](1) The raw materials containing C, Cr, Ni, Cu, Mo, V, W, Se, Zr, Sn, Ca, N, and Fe are made into powders respectively, and the powders are weighed by weight percentage for batching, and mixed Homogeneously, a mixture is obtained;

[0044] (2) Smelting and pouring the mixture to obtain the required coil;

[0045] (3) When the temperature is 800°C, anneal the coiled plate, and keep it warm for 3 hours after annealing;

[0046] (4) Uncoiling and leveling the annealed coil, and then removing the rough milling of the excess plate edge, and performing the fine milling of the X-shaped groove;

[0047] (5) adopt pickling solution to carry out pickling to the coil plate after fine milling treatment, the time of pickling is 20min, and pickling solution comprises the hydrochloric acid solution that weight percentage is 10%, the citric acid solution that weight percentage is 40%, weight percent The percentage is 20% phosphoric acid solution, the weight percentage is 1% sodium chl...

Embodiment 2

[0055] (1) The raw materials containing C, Cr, Ni, Cu, Mo, V, W, Se, Zr, Sn, Ca, N, and Fe are made into powders respectively, and the powders are weighed by weight percentage for batching, and mixed Homogeneously, a mixture is obtained;

[0056] (2) Smelting and pouring the mixture to obtain the required coil;

[0057] (3) When the temperature is 880°C, anneal the coiled plate, and keep it warm for 1.5h after annealing;

[0058] (4) Uncoiling and leveling the annealed coil, and then removing the rough milling of the excess plate edge, and performing the fine milling of the X-shaped groove;

[0059] (5) adopt pickling liquid to carry out pickling to the coil plate after finishing milling treatment, the time of pickling is 25min, and pickling liquid comprises the hydrochloric acid solution that weight percentage is 13%, the citric acid solution that weight percentage is 32%, weight percent Percentage is the phosphoric acid solution of 21%, the sodium chloride solution that we...

Embodiment 3

[0067] (1) The raw materials containing C, Cr, Ni, Cu, Mo, V, W, Se, Zr, Sn, Ca, N, and Fe are made into powders respectively, and the powders are weighed by weight percentage for batching, and mixed Homogeneously, a mixture is obtained;

[0068] (2) Smelting and pouring the mixture to obtain the required coil;

[0069] (3) When the temperature is 850°C, anneal the coiled plate, and keep it warm for 2 hours after annealing;

[0070] (4) Uncoiling and leveling the annealed coil, and then removing the rough milling of the excess plate edge, and performing the fine milling of the X-shaped groove;

[0071] (5) adopt pickling liquid to carry out pickling to the coil plate after finishing milling treatment, the time of pickling is 30min, and pickling liquid comprises the hydrochloric acid solution that weight percentage is 12%, the citric acid solution that weight percentage is 35%, weight percent The percentage is 22% phosphoric acid solution, the weight percentage is 3% sodium c...

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Abstract

The invention relates to a corrosion-resistant martensite spiral submerged arc welded pipe and a preparation process thereof, and belongs to the technical field of seamless steel pipes. The componentelements of the corrosion-resistant martensite spiral submerged arc welded pipe comprise C, Cr, Ni, Cu, Mo, V, W, Se, Zr, Sn, Ca, N and Fe. The preparation process comprises the steps of raw materialpreparation, coiled plate preparation, annealing, uncoiling, flattening, edge milling, cleaning, spiral cylinder forming, steel pipe forming, expanding, flaw detection and surface treatment, and thenthe corrosion-resistant martensite spiral submerged-arc welded pipe is obtained. According to the corrosion-resistant martensite spiral submerged arc welded pipe, by means of the synergistic effect ofZr, Sn and Ca, granular aluminum oxide is added into a saponification solution, and sodium chloride is added into an acid washing solution, so that the corrosion-resistant martensite spiral submergedarc welded pipe not only has good carbon dioxide corrosion resistance and low cracking rate, but also has a relatively low hardness HRC value; and meanwhile, the situation that pits and hard spots appear on the surface of the pipe is reduced, the service life is prolonged, and the product percent of pass is increased.

Description

technical field [0001] The invention relates to the technical field of seamless steel pipes, in particular to an anti-corrosion martensitic spiral submerged arc welded pipe and a preparation process thereof. Background technique [0002] Due to people's growing concern about the reduction of oil resources, oil and gas wells operate at higher temperatures and strengths, and the liquids produced usually contain carbon dioxide, and the stainless steel pipes that transport the liquid are often corroded by carbon dioxide and cause stress cracks, which pose a safety hazard . The same is true for stainless steel pipes that transport oil and natural gas. [0003] At present, the patent document with the authorized announcement date of 2018.06.05 and the authorized announcement number CN106391715B discloses a preparation process of a martensitic seamless steel pipe, including punching a center hole in the tube blank of the martensitic steel pipe, and then piercing; The finished tub...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/08C23G5/032C23C8/10C22C33/04C22C38/42C22C38/44C22C38/46C22C38/50C22C38/60C21D1/26C21D6/00C21D9/00B23P15/00
CPCB23P15/00C21D1/26C21D6/004C21D9/0081C21D2211/008C22C33/04C22C38/001C22C38/002C22C38/008C22C38/42C22C38/44C22C38/46C22C38/50C22C38/60C23C8/10C23G1/088C23G5/032
Inventor 刘宇
Owner TIANJIN HAUYOU STEEL PIPE
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