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A low-sulfur and low-phosphorus steel welding rod for resisting hydrogen induced crack hydrogen sulfide corrosion

A technology against hydrogen-induced cracking and hydrogen sulfide, applied in welding equipment, welding media, manufacturing tools, etc., can solve the problems of increased brittle transition temperature, increased brittleness of deposited metal, unfavorable low temperature impact toughness, etc.

Active Publication Date: 2019-12-03
ATLANTIC CHINA WELDING CONSUMABLES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although in the CN102528310A patent, the mechanical properties of the deposited metal meet the requirements of the patent, adding ferromolybdenum to its formula will increase the brittleness of the deposited metal, and the brittle transition temperature will increase, which is not conducive to stable low-temperature impact toughness; and the patent of CN201210547546 Among them, although they are all steel electrodes for anti-HIC and SSC, the tensile strength of the deposited metal is less than 500MPa, and the range of strength levels used is different, which cannot meet the requirements of this patent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The coating that electrode of the present invention adopts is mainly carbonate, fluoride and alloy, adds a small amount of rutile and improves pressure coating material simultaneously.

[0039] The components and parts by mass of the drug skin powder are as follows: 42 parts by mass of carbonate, 15 parts by mass of fluoride, 7.5 parts by mass of rutile, 6 parts by mass of silicon dioxide, 5 parts by mass of electrolytic manganese, 8 parts by mass of ferrosilicon, 9 parts by mass of iron powder, 0.6 parts by mass of soda ash, 0.8 parts by mass of sodium alginate, and 0.1 parts by mass of graphite.

[0040] Among the carbonates of the present invention, CaCO3≥96%, S≤0.03%, P≤0.03% are preferred, and the particle size requirements are -30 mesh 100%, -40 mesh≥97%, -170 mesh≤70%.

[0041] Among the fluorides of the present invention, CaF2≥96%, SiO2≤3.0%, C≤0.08%, S≤0.03%, P≤0.03% are preferred, and the particle size requirements are -30 mesh 100%, -40 mesh ≥97%, -170 Mesh ...

Embodiment 2

[0053] Others are the same as in Example 1, but the components and parts by mass of the skin powder are as follows: 42 parts by mass of carbonate, 15 parts by mass of fluoride, 4 parts by mass of rutile, 6 parts by mass of silicon dioxide, and 6 parts by mass of electrolytic manganese 10 parts by mass of ferrosilicon, 10 parts by mass of iron powder, 0.6 parts by mass of soda ash, 0.8 parts by mass of sodium alginate, and 0.15 parts by mass of graphite.

Embodiment 3

[0055] Others are the same as in Example 2, but the components and parts by mass of the skin powder are as follows: 42 parts by mass of carbonate, 15 parts by mass of fluoride, 7.5 parts by mass of rutile, 6 parts by mass of silicon dioxide, and 6 parts by mass of electrolytic manganese 10 parts by mass of ferrosilicon, 10 parts by mass of iron powder, 0.6 parts by mass of soda ash, 0.8 parts by mass of sodium alginate, and 0.15 parts by mass of graphite.

[0056] Implementation 1-3 low-sulfur, phosphorus, hydrogen-induced cracking, and hydrogen sulfide corrosion-resistant steel electrodes. When using DC reverse welding, the arc is stable, basically no spatter, good slag removal, excellent all-position welding performance, beautiful weld shape, and weld bead Moderate height. After heat treatment at 620±15℃×2h, the mechanical properties of the deposited metal are: yield strength RpeL: 402Mpa, tensile strength Rm: 520Mpa, elongation A: 30%, -30℃ low-temperature impact function a...

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Abstract

The invention discloses a low-sulfur and low-phosphorus steel welding rod for resisting hydrogen induced crack hydrogen sulfide corrosion. The welding rod is composed of a low-sulfur-phosphorus core wire and coating flux powder wrapping the surface of the core wire. Composition and content of the coating flux powder are as follows: 40- 44 parts by mass of carbonate, 15-18 parts by mass of fluoride, 4-7.5 parts by mass of rutile, 6-8 parts by mass of silicon dioxide, 3-6 parts of electrolytic manganese, 8-11 parts by mass of silicon iron, 8-10 parts by mass of iron powder, 0.5-1.0 part by mass of sodium carbonate, 0.5-1.0 part by mass of sodium alginate and 0.10-0.15 part by mass of graphite. Compared with the prior art, the welding rod is stable in electric arc, small in splashing, goodin deslagging, attractive in molding and good in all-position operation performance.

Description

technical field [0001] The invention relates to the field of welding materials, in particular to a low-sulfur phosphorus steel electrode for resisting hydrogen-induced cracking and hydrogen sulfide corrosion and a preparation method thereof. Background technique [0002] In the initial stage of drilling and development of sour oil and gas fields in my country, oil casings in wet hydrogen sulfide environment, rupture of gathering pipelines and equipment, and failure of wellhead devices, these sudden accidents of sulfide stress cracking caused huge losses. even H 2 Under the condition of very low S content, as long as there is water, it will also cause sudden sulfide stress cracking in metallic materials. The problems caused by hydrogen-induced corrosion (HIC) and sulfide stress corrosion (SSC) in the storage and transportation of petroleum, natural gas and other resources and some chemical products are getting more and more attention, and the requirements for corresponding m...

Claims

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Application Information

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IPC IPC(8): B23K35/02B23K35/30B23K35/36
CPCB23K35/0266B23K35/3053B23K35/3602
Inventor 朱宇霆张克静蒋勇陈维富
Owner ATLANTIC CHINA WELDING CONSUMABLES
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