A method of additive manufacturing-temperature-controlled slot rolling for preparing stainless steel composite steel bars

A technology for additive manufacturing and composite steel bars, which is applied in the fields of temperature-controlled slot rolling of metal materials and arc additive manufacturing, which can solve the problems of poor corrosion resistance of carbon steel and low impact toughness at low temperature.

Inactive Publication Date: 2020-08-04
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the disadvantages of poor corrosion resistance and low low temperature impact toughness of current carbon steel in engineering structural steel

Method used

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  • A method of additive manufacturing-temperature-controlled slot rolling for preparing stainless steel composite steel bars
  • A method of additive manufacturing-temperature-controlled slot rolling for preparing stainless steel composite steel bars
  • A method of additive manufacturing-temperature-controlled slot rolling for preparing stainless steel composite steel bars

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Grind the surface of 45# steel with an angle grinder and sandpaper to remove the oxide layer until the surface is polished and bright. Among them, the size of 45# steel is 28mm*28mm*180mm.

[0035] (2) Clean the polished 45# steel surface with alcohol, remove the oil on it, and dry it with a hair dryer.

[0036](3) Use the YA-1VAR61CJ0 welding robot produced by Tangshan Matsushita Industrial Machinery Co., Ltd. to weld a layer of 3mm thick SUS304 stainless steel around the 45# steel. The specific operation is as follows: put the 45# steel flat, weld on one of the sides, perform weaving welding with an amplitude of 7mm on the two sides, and perform a straight line welding in the middle, so that one side is welded, and repeat the above for the other 3 sides step. Welding parameters: Weaving welding: amplitude 7mm, undulating point current 120A, welding speed 0.15m / min; straight line welding: undulating point current 150A, welding speed 0.3m / min.

[0037] (4) After ...

Embodiment 2

[0044] (1) Grind the surface of Q345 steel with an angle grinder and sandpaper to remove the oxide layer until the surface is polished and bright. Among them, the size of Q345 steel is 28mm*28mm*180mm.

[0045] (2) Clean the polished Q345 steel surface with alcohol, remove the oil stains on it, and dry it with a hair dryer.

[0046] (3) Use the YA-1VAR61CJ0 welding robot produced by Tangshan Matsushita Industrial Machinery Co., Ltd. to surfacing a layer of 3mm thick SUS304 stainless steel around the Q345 steel. The specific operation is as follows: put the Q345 steel flat, weld on one of the sides, perform weaving welding with an amplitude of 7mm on the two sides, and perform a straight line welding in the middle, so that one side is welded, and repeat the above steps for the remaining 3 sides . Welding parameters are the same as in Example 1.

[0047] (4) After all the four sides are welded, the Q345 steel edges are fixed and laid flat, and then the four edges are filled a...

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Abstract

The invention discloses a method for preparing a stainless steel composite reinforcing steel bar through additive-manufacturing and temperature-controlled slot rolling. The method comprises the following steps: pre-treating a carbon-steel surface and then performing electric-arc additive manufacturing, and surfacing a layer of stainless steel with a thickness of 2.5-5mm at the periphery of the carbon-steel surface; using straight-line welding to perform welding filling on four edges until carbon steel is completely coated by stainless steel, thereby obtaining a stainless steel composite rod; performing quenching and tempering treatment, and finally performing multi-pass slot rolling and forming on a slot rolling mill for coating stainless steel onto a carbon-steel base body, obtaining a relatively good inter-layer interface junction state and a nano-scale crystalline grain dimension, thereby realizing the purposes of resisting corrosion, strengthening and toughening. Through electric-arc additive-manufacturing, very strong interface bonding strength can be obtained, tensile property can reach 800-1000 MPa, and impact toughness can be 120-150J / cm<2>.

Description

technical field [0001] The invention relates to an electric arc additive manufacturing technology, belonging to the field of additive manufacturing, in particular to a metal material temperature-controlled groove rolling technology, and belonging to the field of metal rolling. Background technique [0002] According to data, my country's demand for steel in 2018 was 670 million tons, of which steel used in the construction industry accounted for more than half, as high as 370 million tons. Among them, the research on reinforced concrete has become a hotspot. However, in reinforced concrete structures, the corrosion of steel bars leads to the destruction of civil engineering and infrastructure, which has become a worldwide problem that plagues scientific research workers. Since the conventional steel bars are mostly made of carbon steel, their corrosion resistance is poor. Corrosion and rust will cause the material to loosen and expand to generate internal stress. When the in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/04
CPCB21C37/042
Inventor 刘宝玺樊宽远冯建航张博洋陈翠欣殷福星
Owner HEBEI UNIV OF TECH
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