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High-strength deformed steel bar and manufacture method thereof

A manufacturing method and technology of rebar, applied in the field of rebar, can solve the problems of reducing the comprehensive mechanical properties of products and increasing the cost of products, and achieve the effects of low cost, improved strength and good comprehensive performance

Inactive Publication Date: 2010-09-15
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can increase the strength of the final product, it increases the cost of the product
At the same time, if the addition of these elements is not well controlled, the compounds formed by them will also aggregate and reduce the comprehensive mechanical properties of the product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A high-strength rebar and its manufacturing method: on the basis of the chemical composition of 20MnSi rebar, 0.001-0.01wt% of Ti, 0.0008-0.05wt% of B and 0.001-0.05wt% of Ti, 0.0008-0.05wt% of 20MnSi rebar are added during smelting V, through continuous casting or semi-continuous casting into cast slabs; then soak the cast slabs, rough rolling at 1000°C-1100°C, with a deformation of 40-60%; then intermediate rolling at 950°C-1050°C , the amount of deformation is 30-50%; finally, it is finished rolling at 700°C-800°C, and the amount of deformation is 10-30%.

[0015] In this embodiment, when boron is added, the contents of free oxygen and nitrogen in molten steel are 8-15ppm respectively

Embodiment 2

[0017] A high-strength threaded steel and its manufacturing method: a high-strength threaded steel and its manufacturing method: on the basis of the chemical composition of 20MnSi threaded steel, 0.01-0.1wt% Ti, 0.05-0.5wt% of 20MnSi threaded steel are added during smelting % B and 0.05-0.5wt% V, through continuous casting or semi-continuous casting into a slab; then the slab is soaked, rough rolled at 1000°C-1100°C, and the deformation is 40-60%; then Intermediate rolling at 950°C to 1050°C, with a deformation of 30 to 50%; finally, finish rolling at 700°C to 800°C, with a deformation of 10 to 30%.

[0018] In this embodiment, when boron is added, the contents of free oxygen and nitrogen in molten steel are 8-15ppm respectively

Embodiment 3

[0020] A high-strength rebar and its manufacturing method: on the basis of the chemical composition of 20MnSi rebar, 0.001-0.01wt% Ti and 0.0008-0.05wt% B of 20MnSi rebar are added during smelting, and the continuous casting or semi-continuous Cast into a slab; then heat the slab, rough rolling at 1000°C-1100°C, with a deformation of 40-60%; then medium-roll at 950-1050°C, with a deformation of 30-50% ; Finally, finish rolling at 700°C to 800°C, with a deformation of 10% to 30%.

[0021] In this embodiment, when boron is added, the contents of free oxygen and nitrogen in molten steel are respectively 3-10ppm

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Abstract

The invention relates to a high-strength deformed steel bar and a manufacture method thereof. The invention adopts the technical scheme which comprises the following steps of: adding 0.001-0.1wt% of Ti, 0.0008-0.5 wt% of B and 0-0.5 wt% of V relative to a 20MnSi deformed steel bar during smelting on the basis of the chemical components of the 20MnSi deformed steel bar, continuously casting or semi-continuous casting to form a cast blank; then, soaking the cast blank, roughly rolling under the condition of 1000-1200 DEG C and the distortion of 40-80 percent; then, moderately rolling under the condition of 950-1100 DEG C and the distortion of 30-70 percent; and finally, finely rolling under the condition of 700-900 DEG C and the distortion of 10-40 percent. The invention adopts low-price boron to substitute higher-price elements of Nb, V, and the like, and the strength of the manufactured high-strength deformed steel bar is 100-150 MPa higher then that of common 20MnSi deformed steel bar with the same specification and the cost of the manufactured high-strength deformed steel bar can be reduced by 100-300 yuan / ton. Compared with original 20MnSi deformed steel bar, the deformed steel bar has improved strength, slightly decreased extensibility and favorable comprehensive performance.

Description

Technical field: [0001] The invention belongs to the technical field of threaded steel. In particular, it relates to a high-strength threaded steel and a manufacturing method thereof. Background technique [0002] Rebar is a long bar, mainly for construction steel, and is a relatively old product. However, with the rapid development of many infrastructure constructions such as highways and the real estate industry, people's requirements for the quantity and quality of rebar have been greatly improved. However, domestic high-grade iron ore is scarce, and many steel mills rely on imported iron ore to maintain production, so the cost of rebar is relatively high. [0003] Therefore, wishing to produce high-strength, low-cost rebar has attracted great attention of technicians. Taking 20MnSi rebar as an example, in order to improve the strength, many steel mills add expensive alloy elements such as Nb, V, Ti to the alloy [Zhang Mengyi, Lu Dingcai, Lu Ruiguo, Trial production of...

Claims

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Application Information

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IPC IPC(8): C22C38/54C22C38/58B21B37/74B21B37/16
Inventor 朱远志梁冬梅吴志方李俊超
Owner WUHAN UNIV OF SCI & TECH
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