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HRB500 reinforcing steel bar and preparation method thereof

A technology of steel bar and chemical composition, applied in the production field of low alloy steel, can solve the problems of large fluctuation of steel performance, high welding performance, high content of ⅰ silicon manganese and carbon, reduce eutectoid transformation temperature, delay pearlite transformation, The effect of improving the strength of steel bars

Inactive Publication Date: 2013-12-18
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] ⅰ Silicon-manganese and carbon content are high, and the alloy cost is high;
[0004] ⅱIt is easy to produce element segregation during continuous casting;
[0005] ⅲ High carbon equivalent, poor welding performance, high niobium or vanadium content, high alloy cost;
[0006] ⅳThe composition is controlled according to the lower limit, and the steel bar is rolled by controlled cooling technology, the performance of the steel bar fluctuates greatly, the aging phenomenon is serious, and the steel bar is easy to rust

Method used

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  • HRB500 reinforcing steel bar and preparation method thereof
  • HRB500 reinforcing steel bar and preparation method thereof
  • HRB500 reinforcing steel bar and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] According to the weight percentage of chemical composition C: 0.15%, Si: 0.49%, Mn: 1.5%, P: 0.025%, S: 0.015%, B: 0.0024%, the raw materials are weighed, desulfurized by molten iron, converter smelting, deoxidation outside the furnace, blowing Argon, billet protection pouring, billet heating, rolling, controlled cooling after rolling, cooling bed air cooling, cutting to length, bundling and storage to obtain HRB500 steel bars; among them:

[0035] 1) In the billet protection pouring process, the superheat of molten steel is controlled to 35°C, a magnesium tundish is used, the penetration depth of the tundish nozzle is 120mm; the billet casting speed is 1.2m / min, and the casting billet continuous casting straightening temperature is 950°C;

[0036] 2) During billet heating: heat the billet to 1150°C in the furnace and keep it for 120 minutes;

[0037] 3) During the rolling process: the rolling start temperature is 1050°C, the rolling pass is 2 billet opening passes, the...

Embodiment 2

[0040] According to the weight percentage of chemical composition C: 0.13%, Si: 0.45%, Mn: 1.35%, P: 0.028%, S: 0.018%, B: 0.0019%, the raw materials are weighed, desulfurized by molten iron, converter smelting, deoxidation outside the furnace, blowing Argon, billet protection pouring, billet heating, rolling, controlled cooling after rolling, cooling bed air cooling, cutting to length, bundling and storage to obtain HRB500 steel bars; among them:

[0041] 1) In the billet protection pouring process, the superheat of molten steel is controlled to 15°C, a magnesium tundish is used, and the penetration depth of the tundish nozzle is 120mm; the casting speed is 1.5m / min, and the continuous casting and straightening temperature of the cast slab is 1000°C;

[0042] 2) During the billet heating process: heat the billet to 1250°C in the furnace for 100 minutes;

[0043] 3) During the rolling process: the rolling start temperature is 1150°C, the rolling pass is 2 for billet opening, 1...

Embodiment 3

[0046] According to the weight percentage of chemical composition C: 0.15%, Si: 0.6%, Mn: 1.6%, P: 0.023%, S: 0.028%, B: 0.004%, the raw materials are weighed, desulfurized by molten iron, converter smelting, deoxidation outside the furnace, blowing Argon, billet protection pouring, billet heating, rolling, controlled cooling after rolling, cooling bed air cooling, cutting to length, bundling and storage to obtain HRB500 steel bars; among them:

[0047] 1) During the billet protection pouring process, the superheat of molten steel is controlled to 20°C, a magnesium tundish is used, and the penetration depth of the tundish nozzle is 130mm; the billet casting speed is 1.4m / min, and the casting billet continuous casting straightening temperature is 980°C;

[0048] 2) During billet heating: heat the billet in the furnace to 1200°C for 100 minutes;

[0049] 3) During the rolling process: the rolling start temperature is 1050°C, the rolling pass is 2 passes, and the rough rolling is...

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Abstract

The invention discloses an HRB500 reinforcing steel bar and a preparation method thereof. The reinforcing steel bar comprises the following chemical components in percentage by weight: 0.10-0.18% of C, 0.2-0.8% of Si, 1.2-1.6% of Mn, less than or equal to 0.04% of P, less than or equal to 0.04% of S, 0.001-0.005% of B and the balance of Fe and inevitable impurities. The preparation method comprises the following steps: heating a billet to 1,150-1,250 DEG C in a furnace; performing heat preservation for 100-120 minutes; taking the billet out of the furnace; rolling when the temperature is within 1,050-1,150 DEG C; rolling, and cogging for two times, wherein the billet is rolled for 14-18 times in all roughly, moderately and finely, and the total compression ratio is 64-156; cooling to 600-680 DEG C at a speed of 8-12 DEG C / s after the fine rolling is finished; finally air-cooling to the room temperature. According to the HRB500 reinforcing steel bar and the preparation method, the strength of the reinforcing steel bar is improved through tissue phase change. Compared with the prior art, the HRB500 reinforcing steel bar is smelted by using a smelting method for ordinary steel, and is subsequently cast into the billet, and meanwhile the alloy content is reduced, so that the product cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of low alloy steel production, and in particular relates to a HRB500 steel bar and a production method thereof. technical background [0002] At present, on the basis of the composition design of carbon-manganese steel series, my country mainly uses manganese and silicon-based iron alloys for alloying manganese and silicon elements, uses vanadium-iron or vanadium-nitrogen alloys for vanadium microalloying, and uses niobium-iron alloys for niobium microalloying And other technologies, relying on carbon, manganese and silicon solid solution strengthening and vanadium, niobium precipitation strengthening to produce HRB500 grade steel bars. This technology has the following problems: [0003] ⅰ Silicon-manganese and carbon content are high, and the alloy cost is high; [0004] ⅱIt is easy to produce element segregation during continuous casting; [0005] ⅲ High carbon equivalent, poor welding performance, high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C33/04C21D8/08
Inventor 徐志东范植金徐志吴杰周新龙罗国华张帆丁礼权王瑞敏
Owner 武汉钢铁有限公司
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