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High-strength rebar and manufacturing process thereof

A threaded steel bar and high-strength technology, applied in the field of iron and steel metallurgy, can solve problems such as large fluctuations in steel performance indicators and no specification series for high-strength steel bars, and achieve the effects of stable mechanical properties and improved steel strength.

Inactive Publication Date: 2008-10-01
TIANJIN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most domestic enterprises adopt micro-alloying hot rolling process for production, while most foreign enterprises adopt waste heat treatment process for production, and the product performance can basically meet the standard requirements. The high-strength steel bars produced by the process have not formed a series of specifications, and there are large fluctuations in the performance indicators of the steel bars

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The specification is 12mm rebar: the composition is: C: 0.14%, Si: 0.21%, Mn: 0.45%, P: 0.017%, S: 0.012%, carbon equivalent: 0.22%, and the balance is Fe.

[0033] (1) Raw material: 150×150×12000mm continuous casting billet.

[0034] (2) Heating process: the billet is subjected to three-stage heating treatment, wherein the temperature of the preheating section is: 880-930°C; the temperature of the heating section is: 1130-1160°C; the temperature of the soaking section is: 1100-1130°C. The total heating time was 95 minutes. The control temperature range to the rolling stage is: 1010 ~ 1040 ℃.

[0035] (3) Rolling process:

[0036] Rough rolling process: the rough rolling unit adopts micro-tension rolling, the size of the red billet at the exit of the sixth rolling mill is 76mm×76mm, and the roll gap value is 10mm.

[0037] Intermediate rolling process: The intermediate rolling unit adopts looper-controlled tension-free rolling. The size of the red billet at the exit ...

Embodiment 2

[0043] The specification is 16mm rebar: the composition is: C: 0.17%, Si: 0.22%, Mn: 0.66%, P: 0.013%, S: 0.015%, carbon equivalent: 0.28%, and the balance is Fe.

[0044] (1) Raw material: 150×150×12000mm continuous casting billet.

[0045] (2) Heating process: the billet is subjected to three-stage heating treatment, wherein the temperature of the preheating section is: 890-940°C; the temperature of the heating section is: 1130-1160°C; the temperature of the soaking section is: 1110-1140°C. The total heating time was 95 minutes. The control temperature range to the rolling stage is: 1020 ~ 1050 ℃.

[0046] (3) Rolling process:

[0047] Rough rolling process: the rough rolling unit adopts micro-tension rolling, the size of the red billet at the exit of the sixth rolling mill is 76mm×76mm, and the roll gap value is 10mm.

[0048] Intermediate rolling process: The intermediate rolling unit adopts looper-controlled tension-free rolling. The red billet size at the exit of the ...

Embodiment 3

[0054] The specification is 22mm rebar: the composition is: C: 0.22%, Si: 0.58%, Mn: 1.32%, P: 0.016%, S: 0.019%, carbon equivalent: 0.44%, and the balance is Fe.

[0055] (1) Raw material: 150×150×12000mm continuous casting billet.

[0056] (2) Heating process: The billet is subjected to three-stage heating treatment, wherein the temperature of the preheating section is: 830-880°C; the temperature of the heating section is: 1110-1140°C; the temperature of the soaking section is: 1080-1110°C. The total heating time was 100 minutes. The control temperature range to the rolling stage is: 990 ~ 1020 ℃.

[0057] (3) Rolling process:

[0058] Rough rolling process: the rough rolling unit adopts micro-tension rolling, the size of the red billet at the exit of the sixth rolling mill is 76mm×76mm, and the roll gap value is 10mm.

[0059] Intermediate rolling process: The intermediate rolling unit adopts looper-controlled tension-free rolling. The red billet size at the exit of the ...

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Abstract

A high intensity deformed steel bar and a manufacturing procedure thereof are disclosed, belonging to the field of steel metallurgy and suitable for the deformed steel bar with 12mm to 40mm production standard. The high intensity deformed steel bar of the invention comprises the ingredients: C: 0.12-0.25%; Si; 0.12-0.80%; Mn: 0.30-1.55%, P: 0.01-0.035%, S: 0.01-0.040%, equivalent weight of carbon: 0.19-0.51% the rests are Fe. The procedure flow of the invention comprises the steps of: squaring billet, heating, roughly and intermediately rolling, precisely rolling, performing QTB water penetration, placing on a cooling bed (cooling naturally), scaling, checking and putting into storage. The invention has the advantage that: chemical ingredients are designed diversely according to the diverse production standards of the deformed steel bar, the after-rolling remaining heat treatment procedure is used to keep the steel bar in a good plasticity and toughness.

Description

technical background [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular provides a high-strength threaded steel bar and a preparation process thereof. Background technique [0002] Hot-rolled ribbed steel bar for reinforced concrete is a key material widely used in various construction projects at home and abroad, and it is also a key product mass-produced by various steel plants in my country's metallurgical industry. With the rapid development of the construction industry, higher quality standards have been put forward for this product, requiring its performance to have both high strength and good plasticity, weldability, fatigue resistance and adhesion to meet the requirements of high-rise buildings. , Large-span, earthquake resistance, low temperature resistance and other high-end construction projects, and at the same time can achieve the purpose of saving steel and reducing costs. [0003] Most domestic enterprises adop...

Claims

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Application Information

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IPC IPC(8): C22C38/04E04C5/03B21B37/74B21B37/46B21B37/16C21D8/06
CPCY02P10/20
Inventor 曾小平董天真李树庆梁云科杨伟增巩文旭李建强
Owner TIANJIN IRON & STEEL GRP
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