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Method for wrapping and rolling composite preparation of stainless steel compound threaded rebar

A technology for rolling composite and threaded steel bars, applied in the field of steel manufacturing, can solve the problems of low interface bonding strength, low production efficiency and high preparation cost, and achieve the effects of improving interface bonding performance, high production efficiency and large annual output

Inactive Publication Date: 2017-01-04
武威市锦范工贸有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method also has problems such as low production efficiency, high preparation cost and low interfacial bonding strength.

Method used

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  • Method for wrapping and rolling composite preparation of stainless steel compound threaded rebar
  • Method for wrapping and rolling composite preparation of stainless steel compound threaded rebar
  • Method for wrapping and rolling composite preparation of stainless steel compound threaded rebar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Taking a 20MnSi billet with a cross-section of 150mm×150mm as the core material and SUS304 stainless steel as the cladding material, the finished product is a φ10mm threaded steel bar (the thickness of the cladding material is 0.5mm, and the diameter of the core material is 9.0mm) as an example. The specific preparation method is as follows:

[0049] Use hydrochloric acid aqueous solution with a temperature of 60-80°C and a concentration of 8-10% to clean the iron oxide scale on the surface of the billet, then wash the residual acid with clean water, and dry it with hot air for later use; roll a 20MnSi square billet of 150mm×150mm Assuming that the rounded corner of the billet is R15mm, the total elongation coefficient reaches 350.64, the thickness of the cladding material in the finished product is 0.5mm, and the calculated thickness of the stainless steel cladding material 2 in the composite billet is 8.7mm. The side length is 167.4mm. According to the external dimens...

Embodiment 2

[0053] The 20MnSi square billet with a cross-section of 150mm×150mm is used as the core material, the electroplated nickel layer is used as the isolation layer, and the SUS304 stainless steel is used as the cladding material, and the finished product is a φ10mm threaded steel bar (the thickness of the cladding material is 0.45mm, and the thickness of the isolation layer is 0.05mm. , core material diameter is 9.0mm) as an example, the specific preparation method is as follows:

[0054] Use a high-speed rotating wire brush to clean the oxide scale on the surface of the billet; roll a 150mm×150mm 20MnSi billet into a φ10mm threaded steel bar, set the fillet of the billet as R15mm, the total elongation coefficient is 350.64, and the finished product is isolated The thickness of the layer is 0.05mm, the thickness of the cladding material is 0.45mm, the thickness of the isolation layer 3 in the composite billet is 0.86mm, the thickness of the stainless steel cladding material 2 is 7....

Embodiment 3

[0058] With the SS400MPa threaded steel billet with a cross-section of 280mm×280mm as the core material, 99.9% industrial pure nickel strip as the isolation layer, and SUS304 stainless steel as the cladding material, the finished product is a φ20mm threaded steel bar (the thickness of the cladding material is 0.9mm, The thickness of the isolation layer is 0.1mm, and the diameter of the core material is 18.0mm) as an example, the specific preparation method is as follows:

[0059] Use a high-speed rotating grinding wheel to polish the oxide scale on the surface of the billet; roll a 280mm×280mm billet into a φ20mm threaded steel bar, set the fillet of the billet as R30mm, the total elongation coefficient reaches 305.06, and the thickness of the isolation layer in the finished product is 0.1mm, and the thickness of the stainless steel cladding is 0.9mm, then the calculated thickness of the isolation layer 3 in the composite billet is 5.31mm, the thickness of the stainless steel c...

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Abstract

The invention discloses a method for wrapping and rolling composite preparation of a stainless steel compound threaded rebar. The method comprises the following steps: raw material preparation, combination and forming of a covering material, an isolation layer and a core material, welding of a joint on the surface of the covering material, welding sealing of the end part of a compound steel blank, and heating and rolling of the compound steel blank: cleaning the surface of a raw material, forming the stainless steel covering material, pressing the carbon-steel core material and the nickel or nickel alloy isolation layer into the stainless steel covering layer to enable the covering material to be deformed and cover the core material, then welding the joint and the end part, and performing heating and rolling in sequence to obtain the compound threaded rebar. According to the technological method disclosed by the invention, the compound threaded rebar with a metallurgically bonded interface can be efficiently prepared at low cost. The compound threaded rebar prepared by the method has the characteristics of simple process, high production efficiency, high yield, low production cost, high interface bonding quality and the like.

Description

technical field [0001] The invention relates to a method for preparing threaded steel bars, which belongs to the field of steel manufacturing, in particular to a method for preparing stainless steel composite threaded steel bars by cladding and rolling. Background technique [0002] At present, ordinary threaded steel bars are mainly made of ordinary steel with low alloy composition, which is hot-rolled. Ordinary threaded steel bars are widely used as concrete skeletons in infrastructure construction such as houses, bridges, roads, dams, and power stations. In corrosive environments such as humidity and salt spray, ordinary threaded steel bars are not resistant to corrosion and lead to premature failure of concrete structures, which greatly affects the safety and service life of buildings. For this reason, people have developed stainless steel threaded steel bars, which effectively solve the problem of seawater corrosion, but because they contain rare and precious metals su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/16B21B15/00B21B37/74
CPCB21B1/163B21B3/02B21B15/00B21B37/74B21B2001/081B21B2205/02
Inventor 井玉安
Owner 武威市锦范工贸有限责任公司
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