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Flux-cored wire and method for welding hot-rolled back-up roll by same

A technology of flux-cored welding wire and support roller, applied in welding medium, welding equipment, welding equipment and other directions, can solve the problems of insufficient wear resistance, cracks, shedding, etc., and achieve improved service life, simple operation process, and no welding defects. Effect

Inactive Publication Date: 2010-06-09
CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a flux-cored welding wire for welding hot-rolled back-up rolls and a method for welding hot-rolled back-up rolls, so as to solve the problems of partial shedding and insufficient wear resistance of hot-rolled back-up rolls after surfacing repair and cracks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: For repairing tensile strength ≥ 800N / mm 2 60CrNiMo series of hot-rolled backup rolls.

[0025] Flux-cored welding wire of the present invention, according to hot-rolled support roll performance requirements, select the following alloy powder: ferrochromium, tungsten carbide, ferromolybdenum, ferrosilicon, ferrovanadium, ferronickel, iron powder, ferrotungsten, its granularity is 60~ 120 mesh, mixed evenly according to the proportion and put into the feeder of the flux-cored wire rolling machine. When the wire rolling machine is working, the uniformly mixed powder is stably and evenly sprinkled on the flux-cored wire sheathed steel strip to wrap it into a tube, and then After being drawn by a wire drawing machine, the outer diameter is made of Tubular flux-cored wire; the chemical composition of the flux-cored wire should be controlled within:

[0026] Carbon (C): 0.20%, Silicon (Si): 0.80%, Manganese (Mn): 0.30%, Chromium (Cr): 3.00, Molybdenum (Mo): 1.50...

Embodiment 2

[0027] Example 2: For repairing tensile strength ≥ 1000N / mm 2 70Cr3Mo series of hot-rolled backup rolls.

[0028] Process ferrochromium, tungsten carbide, ferromolybdenum, ferrosilicon, ferrovanadium, ferronickel, iron powder and ferro-tungsten alloy powder into a particle size of 60-120 mesh, mix them evenly and put them into the distributor of the flux-cored wire rolling machine , when the wire rolling machine is working, the uniformly mixed powder is stably and evenly sprinkled on the flux-cored wire sheath steel strip to wrap it into a tube, and then drawn through a wire drawing machine to make an outer diameter of Tubular flux-cored wire; the chemical composition of the tubular flux-cored wire should be controlled within:

[0029] C: 0.25%, Si: 0.70%, Mn: 0.40%, Cr: 3.50, Mo: 1.50%, W: 0.50%, V: 0.20%, Ni: 1.50%, Sulfur: 0.15%, Phosphorus: 0.18%, I The amount is iron.

Embodiment 3

[0030] Example 3: Repair tensile strength ≥ 1000N / mm 2 45Cr4NiMoV series of hot-rolled backup rolls.

[0031] Process ferrochromium, tungsten carbide, ferromolybdenum, ferrosilicon, ferrovanadium, ferronickel, iron powder and ferro-tungsten alloy powder into a particle size of 60-120 mesh, mix them evenly and put them into the distributor of the flux-cored wire rolling machine , when the wire rolling machine is working, the uniformly mixed powder is stably and evenly sprinkled on the flux-cored wire sheath steel strip to wrap it into a tube, and then drawn through a wire drawing machine to make an outer diameter of Tubular flux-cored wire; the chemical composition of the tubular flux-cored wire should be controlled within:

[0032] C: 0.30%, Si: 0.70%, Mn: 0.40%, Cr: 4.00, Mo: 1.50%, W: 0.30%, V: 0.40%, Ni: 1.00%, Sulfur: 0.15%, Phosphorus: 0.18%, I The amount is iron.

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Abstract

The invention discloses a flux-cored wire and a method for welding a hot-rolled back-up roll by the same, and relates to the welding technology. By using an iron-based steel strip as a sheath, the flux-cored wire comprises the following components in percentage by mass: 0.15 to 0.60 percent of carbon, 0.10 to 2.00 percent of silicon, 0.15 to 2.00 percent of manganese, 2.50 to 7.00 percent of chromium, 0.50 to 2.50 percent of molybdenum, 0.30 to 3.50 percent of tungsten, 0.20 to 1.00 percent of vanadium, 0.20 to 3.00 percent of nickel, 0 to 0.03 percent of sulfur, 0 to 0.03 percent of phosphorus, and the balance of iron. The flux-cored wire needs to keep the surfacing interpass temperature of the cold-rolled back-up roll between 300 and 350 DEG C during constant temperature surfacing work. The flux-cored wire well solves the problem that the intensity of a surfacing material is not matched with the toughness after surfacing of the cold-rolled work roll, so that the hot-rolled back-up roll has high intensity and excellent toughness. Therefore, the service life of the hot-rolled back-up roll is improved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a flux-cored wire for welding hot-rolled back-up rolls, and a method for welding hot-rolled back-up rolls with the above-mentioned flux-cored wire. Background technique [0002] Hot-rolled backup rolls are large-scale metallurgical spare parts. The materials used at home and abroad mainly include 50CrMo, 60CrNiMo, 60CrMnMo, 70Cr3Mo, 45Cr4NiMoV, Cr5, etc. The main reason for failure is that when working under heavy loads and alternating cold and hot conditions, they are affected by the rolling The effect of steel-making changes (plus the segregation of some base metal components and defects in the manufacturing process) makes the roll surface very prone to local accumulation of residual stress at a certain depth. With the passage of time, layered tears gradually spread from point to local level, and even cracks occur, eventually leading to large-scale shedding. Therefore, the sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23P15/00B23K9/04B23K9/235C21D9/38
Inventor 眭向荣刘景凤白波王清宝张迪宋世旭符定梅沈亚威张海波马计平
Owner CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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