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Manufacturing method of super two-phase stainless steel thick-wall welded pipe

A duplex stainless steel and manufacturing method technology, applied in the field of duplex stainless steel material processing, can solve the problems of super duplex stainless steel, such as high price, difficult welding, etc., to solve the problems of forming and roundness, excellent mechanical properties and corrosion resistance Effect

Inactive Publication Date: 2018-07-06
ZHEJIANG JIULI HI TECH METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the high price of super duplex stainless steel and the difficulty of welding, there are many domestic researches on the welding of duplex stainless steel, but there are few researches on the welding of super duplex stainless steel, especially double-sided automatic submerged arc welding of thick-walled pipes. related research information

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0028] The steel grade is S32750, and the specification is φ508*38mm thick-walled super duplex stainless steel welded pipe.

[0029] The raw material is S32750 steel plate with a wall thickness of 38mm. Its main elements contain (% by weight

[0030] Amount): C≤0.030%, Mn≤1.20%, P≤0.035%, S≤0.020%, Si≤0.80%, Cr24.0%-26.0%, Ni6.0%-8.0%, Mo3.0%-5.0 %, N 0.24%-0.32%, Cu≤0.50%.

[0031] Edge milling: processed into X-shaped bevel, outer bevel 22±1°, inner bevel 45±1°, middle blunt edge is 4

[0032] ±0.5mm, outer groove depth 27±0.5mm, inner groove depth 7±0.5mm.

[0033] Pre-bending: Double-die pre-bending is used to pre-bend the edge of the plate, and the curvature of the plate edge after pre-bending is checked by a profiling model to solve the "peach tip" problem caused by insufficient pre-bending angle and too large amount of straight edge.

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Abstract

The invention discloses a manufacturing method of a super two-phase stainless steel thick-wall welded pipe. The manufacturing method comprises the steps of edge milling, prebending, JCO forming, innerdie edge pressing, prewelding, outer welding, inner welding, heat treatment, circle finishing, weld joint X-ray detection, static water pressure testing, chamfering, acid pickling passivation and appearance quality examination. According to the thick-wall super two-phase stainless steel welded pipe manufactured through the method, the weld joint structure ratio of ferrite to austenite is reasonable, the excellent mechanical performance and corrosion resistance are formed, and forming and circular degree problems are well solved through a JCO two-die prebending and inner die edge pressing mixed forming method.

Description

Technical field [0001] The invention belongs to the technical field of duplex stainless steel material processing, and specifically relates to a method for manufacturing a super duplex stainless steel thick-wall welded pipe. Background technique [0002] With the rapid development of the oil and gas industry, economic losses and safety issues caused by corrosion have gradually attracted people's attention. In the process of oil and natural gas extraction, transportation, and refining, chloride, CO2, and H2S corrosion are common serious problems in oil and gas field equipment pipeline systems. [0003] The metallographic structure of super duplex stainless steel is about half of the two structures of austenitic and ferritic. It has the characteristics of austenitic and ferritic stainless steel. The chemical composition contains about 25% Cr and 6%- 7% Ni and 3%-4% Mo, their PRE value is generally greater than 40, with extremely high resistance to pitting, crevice corrosion, stress ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 许全光吉海方焰冰牛凯华沈赟刘明洲周海山李明才陈立新郑国强
Owner ZHEJIANG JIULI HI TECH METALS
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