Novel thin-wall hot-dip galvanized steel pipe

Abstract

The utility model discloses a novel thin-wall hot-dip galvanized steel pipe in the technical field of hot-dip galvanized steel pipes, which comprises a steel pipe body, low-alloy steel is arranged in the steel pipe body, alloy elements, trapezoidal ripples and spiral reinforcing ribs are arranged on the inner side of the low-alloy steel, a pure zinc layer is arranged on the outer side of the low-alloy steel, and the pure zinc layer is arranged on the inner side of the steel pipe body. A silane coupling agent layer is arranged on the outer side of the pure zinc layer, a zinc-nickel alloy layer is arranged on the inner side of the low-alloy steel, an epoxy resin layer is arranged on the inner side of the zinc-nickel alloy layer, and trace alloy elements are added into the base material layer to refine grains, so that the tensile strength and ductility of the thin-wall steel pipe are effectively improved; by means of the trapezoidal corrugations and the spiral reinforcing ribs, the design of the special-shaped section is adopted, the bending rigidity of the thin-walled pipe is effectively improved, the strength loss caused by wall thickness reduction is made up, and the strength of the steel pipe is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hot galvanizing steel pipe technical field, concretely relates to a novel thin wall hot galvanizing steel pipe. BACKGROUND

[0002] Hot galvanizing steel pipe is a kind of steel pipe by hot-dip galvanizing treatment on the surface of welded steel pipe, with excellent corrosion resistance and wide application field, hot galvanizing steel pipe, official name is " hot-dip galvanizing welded steel pipe for low-pressure fluid conveying", is on the basis of welded steel pipe and carries out internal and external hot-dip galvanizing treatment, so that steel pipe inner and outer wall covers a layer of zinc layer simultaneously. Its process includes pickling to remove iron oxide, after cleaning, into high-temperature zinc liquid (about 500 DEG C), form zinc-iron alloy layer, to significantly improve the corrosion resistance of steel pipe.

[0003] The existing thin wall hot galvanizing steel pipe still has some defects, most of the thin wall hot galvanizing steel pipe is prone to deformation after thinning wall thickness, so that the bending resistance and the compression resistance of the steel pipe itself are reduced, the effect of subsequent use is affected, for this purpose, a novel thin wall hot galvanizing steel pipe is provided. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a novel thin wall hot galvanizing steel pipe to solve the problems in the above background.

[0005] To achieve the above object, the utility model provides the following technical scheme: a novel thin wall hot galvanizing steel pipe, including steel pipe body, the inside of steel pipe body is equipped with low alloy steel, the inside of low alloy steel is equipped with alloy element, trapezoidal corrugation and spiral reinforcing rib, the outside of low alloy steel is equipped with pure zinc layer, the outside of pure zinc layer is equipped with silane coupling agent layer, the inside of low alloy steel is equipped with zinc-nickel alloy layer, the inside of zinc-nickel alloy layer is equipped with epoxy resin layer.

[0006] Preferably, the base material of the steel pipe body is composed of high-strength low-alloy steel.

[0007] Preferably, the inside of the low-alloy steel is added with trace alloy elements to refine the grains, and the inside of the low-alloy steel is annularly provided with multiple trapezoidal corrugations, and the low-alloy steel is provided with spiral reinforcing ribs throughout the inside.

[0008] Preferably, the outside surface of the low-alloy steel is hot-dip plated with a pure zinc layer, and the outside surface of the pure zinc layer is sprayed with a silane coupling agent layer.

[0009] Preferably, the inside surface of the low-alloy steel is electroplated with a zinc-nickel alloy layer, and the inside surface of the zinc-nickel alloy layer is sprayed with an epoxy resin layer.

[0010] Compared with the prior art, the utility model has the advantages that:

[0011] The grain is refined by adding trace alloying elements in the substrate layer, and the tensile strength and ductility of the thin-walled steel pipe are effectively improved; the bending stiffness of the thin-walled pipe is effectively improved by the set trapezoidal corrugation and spiral reinforcing rib, the strength loss caused by the thinning of the wall thickness is compensated, and the strength of the steel pipe itself is improved. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model.

[0013] In the figure: 1, steel pipe body; 2, low alloy steel; 3, alloying element; 4, trapezoidal corrugation; 5, spiral reinforcing rib; 6, pure zinc layer; 7, silane coupling agent layer; 8, zinc-nickel alloy layer; 9, epoxy resin layer. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0015] Please refer to Figure 1 The utility model provides a technical scheme: a novel thin-walled hot-dip galvanized steel pipe, which comprises a steel pipe body 1, the inside of the steel pipe body 1 is provided with low alloy steel 2, the inner side of the low alloy steel 2 is provided with alloying element 3, trapezoidal corrugation 4 and spiral reinforcing rib 5, the outer side of the low alloy steel 2 is provided with pure zinc layer 6, the outer side of the pure zinc layer 6 is provided with silane coupling agent layer 7, the inner side of the low alloy steel 2 is provided with zinc-nickel alloy layer 8, and the inner side of the zinc-nickel alloy layer 8 is provided with epoxy resin layer 9.

[0016] Specifically, the substrate of the steel pipe body 1 is composed of high-strength low alloy steel 2, trace alloying elements 3 are added to the inner side of the low alloy steel 2 to refine the grain, a plurality of trapezoidal corrugations 4 are arranged annularly in the inside of the low alloy steel 2, spiral reinforcing ribs 5 are arranged longitudinally in the inside of the low alloy steel 2, a pure zinc layer 6 is hot-dip plated on the outer side surface of the low alloy steel 2, a silane coupling agent layer 7 is sprayed on the outer side surface of the pure zinc layer 6, a zinc-nickel alloy layer 8 is electroplated on the inner side surface of the low alloy steel 2, and an epoxy resin layer 9 is sprayed on the inner side surface of the zinc-nickel alloy layer 8.

[0017] In the embodiment, the base material of the steel pipe body 1 is composed of high-strength low-alloy steel 2, trace alloy elements 3 such as Nb, V and Ti are added to refine the grain and improve the tensile strength and ductility of the thin-walled steel pipe; the trapezoidal corrugation 4 and the spiral reinforcing rib 5 are arranged to effectively improve the bending stiffness of the thin-walled pipe by adopting a special-shaped section design, to make up for the strength loss caused by the thinning of the wall thickness; the hot-dip pure zinc layer 6 is arranged on the outer layer of the low-alloy steel 2, the electroplated zinc-nickel alloy layer 8 is arranged on the inner layer, the nano ceramic coating pre-plating process is adopted to enhance the bonding force between the base material and the zinc layer, and the silane coupling agent layer 7 and the epoxy resin layer 9 are sprayed on the surfaces of the pure zinc layer 6 and the zinc-nickel alloy layer 8 to improve the salt spray corrosion resistance of the steel pipe.

[0018] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A new thin-walled hot-dip galvanized steel pipe comprising a steel pipe body (1), characterized in that: The steel pipe body (1) is internally provided with low alloy steel (2), the inner side of the low alloy steel (2) is provided with alloying elements (3), trapezoidal corrugations (4) and spiral reinforcing ribs (5), the outer side of the low alloy steel (2) is provided with a pure zinc layer (6), the outer side of the pure zinc layer (6) is provided with a silane coupling agent layer (7), the inner side of the low alloy steel (2) is provided with a zinc-nickel alloy layer (8), and the inner side of the zinc-nickel alloy layer (8) is provided with an epoxy resin layer (9).

2. A new thin-walled hot-dip galvanized steel pipe according to claim 1, characterized by: The base material of the steel pipe body (1) is made of high-strength low alloy steel (2).

3. A new thin-walled hot-dip galvanized steel pipe according to claim 1, characterized by: The inner side of the low alloy steel (2) is added with trace alloying elements (3) to refine grains, and the inner side of the low alloy steel (2) is annularly provided with multiple trapezoidal corrugations (4), and the inner side of the low alloy steel (2) is longitudinally provided with spiral reinforcing ribs (5).

4. A new thin-walled hot-dip galvanized steel pipe according to claim 1, characterized by: The outer side surface of the low alloy steel (2) is hot-dip plated with a pure zinc layer (6), and the outer side surface of the pure zinc layer (6) is sprayed with a silane coupling agent layer (7).

5. A new thin-walled hot-dip galvanized steel pipe according to claim 1, characterized by: The inner side surface of the low alloy steel (2) is electroplated with a zinc-nickel alloy layer (8), and the inner side surface of the zinc-nickel alloy layer (8) is sprayed with an epoxy resin layer (9). The inner side surface of the low alloy steel (2) is electroplated with a zinc-nickel alloy layer (8), and the inner side surface of the zinc-nickel alloy layer (8) is sprayed with an epoxy resin layer (9).

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