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L415J steel welding matched flux-cored wire for coal slurry conveying pipe

A flux-cored welding wire, a practical technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of undiscovered flux-cored welding wire, etc., and achieve good welding processability, uniform distribution, and uniform carbon distribution Effect

Active Publication Date: 2020-10-30
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to achieve the purpose of use, the flux-cored wire with excellent alloying is generally used for welding, and there is no relevant literature report on the flux-cored wire that matches the welding of L415J steel for coal slurry delivery pipes.

Method used

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  • L415J steel welding matched flux-cored wire for coal slurry conveying pipe

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of flux-cored welding wire matched with L415J steel welding for coal slurry conveying pipe, including sheath and flux core, the chemical composition and dosage of said flux core are calculated by mass percentage: 0.2% of hollow cage-like carbon microspheres, 4.2% of nano-bismuth powder, Nano beryllium powder 3.5%, manganese fluoride powder 1.2%, molybdenum powder 1.2%, chromium powder 1.6%, niobium powder 0.12%, vanadium powder 0.2%, titanium powder 0.16%, and the balance is FHT100·25 reduced iron powder.

[0027] The outer diameter of the hollow cage carbon microsphere is 300-360nm, the inner diameter is 220-280nm, and the mesopore diameter is 30-40nm.

[0028] The particle size of the nano-bismuth powder is 60nm-90nm.

[0029] The particle size of nano beryllium powder is 60nm-90nm.

[0030] Manganese fluoride powder, molybdenum powder, chromium powder, niobium powder, vanadium powder, titanium powder, and FHT100·25 reduced iron powder have a 100-mesh passing ...

Embodiment 2

[0035] A kind of flux-cored welding wire matched with L415J steel welding for coal slurry conveying pipe, including sheath and flux core, the chemical composition and dosage of the flux core are calculated by mass percentage: hollow cage-like carbon microspheres 0.28%, nano-bismuth powder 5.6%, Nano beryllium powder 4.9%, manganese fluoride powder 2.0%, molybdenum powder 1.5%, chromium powder 1.2%, niobium powder 0.18%, vanadium powder 0.15%, titanium powder 0.15%, and the balance is FHT100·25 reduced iron powder.

[0036] The outer diameter of the hollow cage carbon microsphere is 300-360nm, the inner diameter is 220-280nm, and the mesopore diameter is 30-40nm.

[0037] The particle size of the nano-bismuth powder is 60nm-90nm.

[0038] The particle size of nano beryllium powder is 60nm-90nm.

[0039] Manganese fluoride powder, molybdenum powder, chromium powder, niobium powder, vanadium powder, titanium powder, and FHT100·25 reduced iron powder have a 100-mesh passing rate ...

Embodiment 3

[0044] A kind of flux-cored wire used for welding L415J steel for coal slurry conveying pipe, including sheath and flux core, the chemical composition and consumption of the flux core are calculated by mass percentage: 0.24% of hollow cage-like carbon microspheres, 4.9% of nano-bismuth powder, Nano beryllium powder 4.2%, manganese fluoride powder 1.6%, molybdenum powder 1.45%, chromium powder 1.4%, niobium powder 0.2%, vanadium powder 0.12%, titanium powder 0.16%, and the balance is FHT100·25 reduced iron powder.

[0045] The outer diameter of the hollow cage carbon microsphere is 300-360nm, the inner diameter is 220-280nm, and the mesopore diameter is 30-40nm.

[0046] The particle size of the nano-bismuth powder is 60nm-90nm.

[0047] The particle size of nano beryllium powder is 60nm-90nm.

[0048] Manganese fluoride powder, molybdenum powder, chromium powder, niobium powder, vanadium powder, titanium powder, and FHT100·25 reduced iron powder have a 100-mesh passing rate o...

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Abstract

The invention belongs to the field of welding materials, and particularly relates to an L415J steel welding matched flux-cored wire for a coal slurry conveying pipe. The L415J steel welding matched flux-cored wire comprises an outer skin and a flux core; and the flux core comprises the following components of, 0.2%-0.28% of hollow cage-shaped carbon microspheres, 4.2%-5.6% of nano bismuth powder,3.5%-4.9% of nano beryllium powder, 1.2%-2.0% of manganese fluoride powder, 1.2%-1.5% of molybdenum powder, 1.2%-1.6% of chromium powder, 0.12%-0.2% of niobium powder, 0.12%-0.2% of vanadium powder, 0.12%-0.2% of titanium powder and the balance FHT100.25 iron powder, wherein the sum of the mass of the molybdenum powder and the mass of the chromium powder is not smaller than 2.5%, and the sum of the mass of the niobium powder, the vanadium powder and the titanium powder is not larger than 0.5%. The yield strength, the tensile strength, the yield ratio, the percentage elongation after fracture,the impact absorption energy and the hardness of the obtained deposited metal meet the use requirements, and the welding manufacturability of the welding wire is good.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a flux-cored wire used for welding L415J steel for coal slurry delivery pipes. Background technique [0002] Coal slurry pipeline transportation can be used as another important coal resource transportation method besides railway, highway and waterway transportation, with obvious economic benefits. The coal slurry conveying pipe is made of straight seam welded steel for coal slurry conveying pipe. "Steel Pipe" has put forward specific requirements for this. Due to the particularity of its use, it is necessary to use matching special welding materials. In order to achieve the purpose of use, flux-cored wires with excellent alloying are generally used for welding. At present, no relevant literature reports have been found on flux-cored wires that match the welding of L415J steel for coal slurry delivery pipes. [0003] Therefore, the development of matching ...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/368B23K35/40
CPCB23K35/3053B23K35/368B23K35/406B23K35/0266B23K35/3605
Inventor 刘胜新付雅迪陈永陈志民潘继民袁红高纠永涛王靖博
Owner ZHENGZHOU UNIV
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