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A kind of high-strength rebar and its preparation method

A technology of rebar and billet, applied in coating, anti-corrosion coating, metal material coating process, etc., can solve problems such as affecting the gripping force of rebar and concrete, affecting the quality of rebar using engineering, and not building and storing rebar. , to achieve the effect of improving hardness, strengthening prevention, and preventing rust

Active Publication Date: 2021-10-15
湖北立晋钢铁集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In addition, there are often no special sheds and houses for rebar storage in the engineering construction site, and the rebar transported to the construction site can only be placed in the open air, regardless of the wind and rain, the sun and the rain.
If stacked for a long time, the rebar will rust, which will affect the use of rebar and the quality of the project; in addition, some existing anti-rust treatment methods have the problem of affecting the grip force between rebar and concrete

Method used

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  • A kind of high-strength rebar and its preparation method

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preparation example Construction

[0034] This specific embodiment also includes the preparation method of the above-mentioned threaded steel, including preparing the threaded steel body, and the specific steps are as follows:

[0035] S1. Melting each component into molten steel according to the ratio, and then blowing argon, increasing nitrogen, and blowing argon; continuously casting the molten steel through a continuous casting machine to obtain a billet;

[0036] S2. Rolling the billet into a rebar body, the rolling conditions are billet heating temperature 1100-1300°C, billet starting rolling temperature 1100°C-1150°C, finishing rolling temperature 1000°C±20°C, finishing rolling temperature 900°C-950°C;

[0037] S3. Cool the rebar body obtained in step S2 to 700-750°C and keep it warm for 1-2h, then cool it down to 500-650°C and keep it warm for 0.5-1h;

[0038] S4, then raise the temperature to 700-750°C and keep it warm for 1-2h, then cool down to 500-650°C and keep it warm for 0.5-1h, repeat this step...

Embodiment 1

[0044]A high-strength rebar, including a rebar body, in terms of mass percentage, the rebar body includes the following components:

[0045] 0.33% carbon, 0.40% silicon, 0.05% aluminum, 0.02% titanium, 0.02% nitrogen, 0.2% vanadium, 0.05% manganese, 0.03% phosphorus, 0.005% sulfur, balance iron.

[0046] The specific preparation steps of the rebar body are as follows:

[0047] S1. Melting each component into molten steel according to the ratio, and then blowing argon, increasing nitrogen, and blowing argon; continuously casting the molten steel through a continuous casting machine to obtain a billet;

[0048] S2. Rolling the billet into a rebar body, the rolling conditions are billet heating temperature 1300°C, billet start rolling temperature 1100°C, finish rolling temperature 1000°C±20°C, finish rolling temperature 900°C;

[0049] S3. Cool the rebar body obtained in step S2 to 750°C and keep it warm for 2h, then cool it down to 650°C and keep it warm for 1h;

[0050] S4. A...

Embodiment 2

[0052] A high-strength rebar, including a rebar body, in terms of mass percentage, the rebar body includes the following components:

[0053] 0.25% carbon, 0.35% silicon, 0.1% aluminum, 0.04% titanium, 0.017% nitrogen, 0.1% vanadium, 0.1% manganese, 0.02% phosphorus, 0.08% sulfur, balance iron.

[0054] The specific preparation steps of the rebar body are as follows:

[0055] S1. Melting each component into molten steel according to the ratio, and then blowing argon, increasing nitrogen, and blowing argon; continuously casting the molten steel through a continuous casting machine to obtain a billet;

[0056] S2. Rolling the billet into a rebar body, the rolling conditions are billet heating temperature 1100°C, billet start rolling temperature 1100°C, finish rolling temperature 1000°C±20°C, finish rolling temperature 950°C;

[0057] S3. Cool the rebar body obtained in step S2 to 700°C and keep it warm for 1h, then cool it down to 500°C and keep it warm for 0.5h;

[0058] S4, ...

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Abstract

The invention relates to a high-strength threaded steel and a preparation method thereof. The high-strength rebar includes a rebar body, and the rebar body includes: 0.22‑0.33% carbon, 0.30‑0.40% silicon, 0.05‑0.1% aluminum, 0.01%‑0.04% titanium, 0.017‑0.023% nitrogen, 0.1 %‑0.3% Vanadium, 0.05%‑0.10% Manganese, 0.02‑0.03% Phosphorus, 0.005‑0.01% Sulfur, balance Iron. The preparation method includes preparing the rebar body: S1, melting each component into molten steel, performing continuous casting on the molten steel to obtain a billet; S2, rolling the billet; S3, cooling the rebar body to 500-650° C. And keep warm. The obtained rebar has high strength, the yield strength is as high as 680MPa, and the tensile strength is as high as 870MPa.

Description

technical field [0001] The invention relates to the technical field of threaded steel bar production in the metallurgical industry, in particular to a high-strength threaded steel and a preparation method thereof. Background technique [0002] Hot-rolled ribbed steel bar, commonly known as rebar, is the steel product with the largest amount of steel used in construction at present. As the skeleton material of reinforced concrete, rebar is widely used in various modern engineering constructions such as bridges, ports, dams, wharves, platforms, highways, industrial and civil buildings, and the requirements for the strength of rebar are getting higher and higher. [0003] In addition, rebars are often not built in special sheds and houses for storing rebars in engineering construction sites, and the rebars transported to the construction site can only be placed in the open air, regardless of wind and rain, sun and rain. If stacked for a long time, the rebar will rust, which wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/06C22C38/14C22C38/12C22C38/04C23C30/00C09D5/08
CPCC09D5/08C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C23C30/00
Inventor 曹立晋宋磊
Owner 湖北立晋钢铁集团有限公司
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