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A kind of finish-rolled threaded steel bar and its production method

A technology of finishing rolling thread and production method, which is applied in the field of low-cost and high-strength finishing rolling threaded steel bar and its production field, and can solve the problems of brittle fracture after rolling, increasing the production cost of finishing rolling threaded steel bar, low elongation and the like.

Active Publication Date: 2021-07-02
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially for the PSB785 and PSB830 steel grades with the largest market volume, they are prone to brittle fracture after rolling, low elongation, and need to be quenched and tempered off-line. The production process is cumbersome, and the finishing thread is added production cost of rebar

Method used

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  • A kind of finish-rolled threaded steel bar and its production method
  • A kind of finish-rolled threaded steel bar and its production method
  • A kind of finish-rolled threaded steel bar and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] In the steelmaking and continuous casting process, the converter or electric furnace is used for primary molten steel and ladle alloying. When the molten steel is tapped to 1 / 5, silicon-manganese, ferrosilicon, high-chromium ferrochromium and vanadium-nitrogen alloy are added in sequence, and all of them are added when the molten steel is tapped to 4 / 5, and the composite strengthening micro-nitrogen alloy is added in the process , so that the N content in the molten steel composition reaches 0.019%, the total time of bottom argon blowing is ≥10min, the temperature of the tundish molten steel is controlled at 1510°C, the casting speed is 1.75m / min, the height of the tundish liquid level is ≥700mm, and the continuous casting machine adopts plug For the rod tundish, full protection casting and special mold slag are implemented, and the continuous casting slab must be cooled slowly for more than 24 hours.

[0064] In the steel rolling process, the steel slab that has been s...

Embodiment 2

[0066] In the steelmaking and continuous casting process, the converter or electric furnace is used for primary molten steel and ladle alloying. When the molten steel is tapped to 1 / 5, silicon-manganese, ferrosilicon, high-chromium ferrochromium and vanadium-nitrogen alloy are added in sequence, and all of them are added when the molten steel is tapped to 4 / 5, and the composite strengthening micro-nitrogen alloy is added in the process , so that the N content in the molten steel composition reaches 0.018%, the total time of bottom argon blowing is ≥10min, the temperature of the tundish molten steel is controlled at 1510°C, the casting speed is 1.85m / min, the height of the tundish liquid level is ≥700mm, and the continuous casting machine adopts plug For the rod tundish, full protection casting and special mold slag are implemented, and the continuous casting slab must be cooled slowly for more than 24 hours.

[0067] In the steel rolling process, the steel billet that has been...

Embodiment 3

[0069] In the steelmaking and continuous casting process, the converter or electric furnace is used for primary molten steel and ladle alloying. When the molten steel is tapped to 1 / 5, silicon-manganese, ferrosilicon, high-chromium ferrochromium, ferro-niobium and vanadium-nitrogen alloy are added in sequence, and all of them are added when the molten steel is tapped to 4 / 5, and composite strengthening is added in the process Micro-nitrogen alloy, so that the N content in the molten steel composition reaches 0.022%, the total time of bottom blowing argon is ≥10min, the temperature of the tundish molten steel is controlled at 1520°C, the casting speed is 1.90m / min, the height of the tundish liquid level is ≥700mm, continuous casting The machine adopts a stopper tundish, implements full protection casting and special mold slag, and the continuous casting slab must be cooled slowly for more than 24 hours.

[0070] In the steel rolling process, the steel slab that has been slowly ...

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Abstract

The invention provides two types of finished finished rolled threaded steel bar with a specification of Ф25mm and Ф32mm and a production method thereof. By adjusting the composition of the steel, the residual heat treatment after rolling can be formed at one time, without offline quenching and tempering treatment, which saves processing technology and reduces Production cost of finished rolled rebar. In terms of mass percentage, it includes the following steel components: carbon: 0.28‑0.33%, silicon: 0.55‑0.80%, manganese: 1.20‑1.60%, chromium: 0.30%‑0.45%, vanadium: 0.10%‑0.12%, phosphorus: <0.025%, sulfur: <0.025%, boron ≤0.0035%, N: 0.017‑0.023%; the balance is iron and unavoidable impurities.

Description

technical field [0001] The invention relates to a low-cost high-strength finish-rolled threaded steel bar and a production method thereof. Background technique [0002] Finish-rolled threaded steel bars are widely used in continuous beams and large-scale frame structures in large-scale water conservancy projects, industrial and civil buildings, large and medium-span bridges for highways and railways, nuclear power plants and ground anchors and other projects. The fine-rolled threaded steel bar has the advantages of simple connection and anchorage, strong adhesion, safe and reliable tension anchorage, and convenient construction. Moreover, less material is used, which can reduce the area and weight of components. [0003] With the implementation of the new GB_T 20065-2016 standard, higher requirements are put forward for technical indicators such as the elongation of the finished rolled rebar, which makes it more difficult to directly produce online. Finish-rolled rebars in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C38/24C22C38/02C22C38/04C22C38/32C21D8/08
CPCC21D8/065C21D8/08C22C38/001C22C38/02C22C38/04C22C38/24C22C38/32C22C38/38
Inventor 刘艳林王淑华孙庆亮黄海玉赵英杰娄永涛王建景
Owner SHANDONG IRON & STEEL CO LTD