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A q345ns spiral submerged arc welded pipe for sulfuric acid dew point corrosion resistance and its manufacturing process

A dew point corrosion and submerged arc welded pipe technology, applied in the field of steel pipe manufacturing, can solve the problems of poor forming stability of large-diameter steel pipes and poor sulfuric acid corrosion resistance, and achieve the effects of inhibiting electrochemical reaction, improving passivation ability, and ensuring stability

Active Publication Date: 2021-04-06
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of poor sulfuric acid corrosion resistance of Q345NS spiral welded pipe and poor forming stability of large-diameter steel pipes in the prior art, the present invention provides a Q345NS spiral submerged arc welded pipe resistant to sulfuric acid dew point corrosion

Method used

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  • A q345ns spiral submerged arc welded pipe for sulfuric acid dew point corrosion resistance and its manufacturing process
  • A q345ns spiral submerged arc welded pipe for sulfuric acid dew point corrosion resistance and its manufacturing process
  • A q345ns spiral submerged arc welded pipe for sulfuric acid dew point corrosion resistance and its manufacturing process

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Embodiment 1

[0040] The embodiment of the present invention provides a Q345NS spiral submerged arc welded pipe for sulfuric acid dew point corrosion resistance. The coils used in the pipe include the following components in terms of mass percentage: C: 0.07%, Mn: 0.79%, Si: 0.32%, P: 0.017 %, S: 0.004%, Cu: 0.29%, Cr: 0.87%, Sb: 0.08%, Ni: 0.16%, Sn: 0.008%, B: 0.0003%, Ti: 0.02%, CE pcm : 0.18%, the rest is iron and unavoidable impurities.

[0041] The above-mentioned coils are smelted in a converter and refined outside the furnace. During the continuous casting process, light reductions are used, combined with a reasonable controlled rolling and controlled cooling process. The specification is 12×1800mm, and the outer diameter of the steel pipe is 3020mm. Spiral submerged arc welded pipes, the manufacture of which includes decoiling, leveling, butt welding, edge milling, forming, welding, pipe cutting, ultrasonic inspection, pipe end chamfering and finished product inspection, wherein sa...

Embodiment 2

[0079] The embodiment of the present invention provides a Q345NS spiral submerged arc welded pipe for sulfuric acid dew point corrosion resistance. The coil used in it includes the following components in terms of mass percentage: C: 0.08%, Mn: 0.70%, Si: 0.40%, P: 0.015 %, S: 0.005%, Cu: 0.40%, Cr: 0.60%, Sb: 0.07%, Ni: 0.16%, Sn: 0.0010%, B: 0.0003%, Ti: 0.023%, CE pcm : 0.18%, the rest is iron and unavoidable impurities.

[0080]The above-mentioned coils are smelted in a converter and refined outside the furnace. In the continuous casting process, light reduction is used, and a reasonable controlled rolling and controlled cooling process is used to roll. Submerged arc welded pipes, the manufacture of which includes uncoiling, leveling, butt welding, milling operations, forming operations, welding operations, pipe cutting, ultrasonic inspection, pipe end chamfering and finished product inspection, wherein said forming operations are performed according to 79°12′ The forming...

Embodiment 3

[0089] The embodiment of the present invention provides a Q345NS spiral submerged arc welded pipe for sulfuric acid dew point corrosion resistance. The coils used in the pipe include the following components in terms of mass percentage: C: 0.06%, Mn: 1.20%, Si: 0.28%, P: 0.014 %, S: 0.005%, Cu: 0.20%, Cr: 1.00%, Sb: 0.06%, Ni: 0.15%, Sn: 0.015%, B: 0.0004%, Ti: 0.018%, CE pcm : 0.19%, the rest is iron and unavoidable impurities.

[0090] The above-mentioned coils are smelted in a converter and refined outside the furnace. In the continuous casting process, light reductions are used, and a reasonable controlled rolling and controlled cooling process is used to roll the coils. Q345NS spiral submerged arc welded pipe, its manufacturing method includes uncoiling, leveling, butt welding, milling process, forming process, welding process, pipe cutting, ultrasonic inspection, pipe end chamfering and finished product inspection, wherein the forming process is in accordance with 79 Th...

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Abstract

The invention relates to the technical field of steel pipe manufacturing, and specifically discloses a Q345NS spiral submerged arc welded pipe for sulfuric acid dew point corrosion resistance and a manufacturing process thereof. The welded pipe includes the following chemical composition in terms of mass percentage: C≤0.10%, Mn: 0.70%-1.20%, Si≤0.45%, P≤0.020%, S≤0.008%, Cu: 0.20%-0.40%, Cr: 0.60%~1.00%, Sb: 0.05~0.10%, Ni≤0.25%, Sn≤0.015%, B≤0.0005%, Ti: 0.01~0.05%, CE pcm ≤0.20%, the rest is iron and unavoidable impurities. According to the forming angle of 79°12' in the manufacturing method, the steel strip is made into a helical cylinder. The Q345NS spiral submerged arc welded pipe provided by the invention has excellent mechanical properties and sulfuric acid dew point corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of steel pipe manufacturing, in particular to a Q345NS spiral submerged arc welded pipe for sulfuric acid dew point corrosion resistance and a manufacturing process thereof. Background technique [0002] In metallurgy, electric power, petrochemical and other industrial fields, heavy oil or coal usually contains 2% to 3% sulfur, and the flue gas after sulfur combustion contains about 0.2% SO 2 , SO 2 Produce SO under the catalysis of ash and metal oxides 3 , SO 3 Combined with the moisture contained in the combustion gas or the moisture contained in the air to form sulfuric acid, at the dew point temperature (when the SO in the flue gas 3 The content is 30×10 -6 When the dew point is about 130 ~ 150 ℃), it will condense and form dew drops and corrode in the low temperature parts of oil or coal fired boilers and other equipment, such as boiler air preheaters, economizers, flues, chimneys and desulfurizatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/50C22C38/54C22C38/60B23K9/18B23P15/00
CPCB23K9/18B23P15/00B23K2101/06C22C38/002C22C38/008C22C38/02C22C38/04C22C38/42C22C38/50C22C38/54C22C38/60
Inventor 陈松王晓颖田鹏吴秀宇冯瑶路广平杨明秦贾熙王军朱斌燕孔维国于宾任国庆张麟孙玲玲
Owner BC P INC CHINA NAT PETROLEUM CORP
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