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High-strength reinforced bar and production method for same

A high-strength steel bar and production method technology, applied in the field of metal and processing, can solve problems such as temperature gradient difference, difficult to achieve yield strength, mixed crystals, etc., achieve the effect of improving corrosion resistance, reducing raw material costs, and improving mechanical properties

Inactive Publication Date: 2013-03-27
JIANGSU YONGGANG GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can also greatly reduce the alloy composition, but it has the following defects: the short-term rapid cooling process after rolling will cause uneven cooling of the ribs and the base circle of the rib base, and the problem of temperature gradient difference between the core and the edge of the large section , which is unfavorable to the structure and toughness, and eventually leads to large fluctuations in the performance of the steel bar, prone to inconspicuous yield and mixed crystal phenomenon, poor product quality stability, and the yield strength is difficult to reach more than 600MPa

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The composition of this embodiment is: C: 0.21%, Si: 0.62%, Mn: 1.52%, V: 0.015%, Cr: 0.11%, Nb: 0.014%, P: 0.018%, S: 0.008%, and the balance is Fe.

[0019] Hot rolling process: Send the steel slab in step A into the heating furnace for heating, control the soaking temperature of the steel slab in the heating furnace to 1080-1130°C, start rolling temperature 970-990°C, enter finish rolling temperature 920-930°C, spin the wire The temperature is 930-940°C. It is fed into the roller table with a roller table speed of 0.5m / s, and the fan is fully turned off. 6.5mm wire rod rebar.

[0020] Heat treatment process: Quenching the hot-rolled 6.5mm wire rod and rebar, the quenching heating temperature is 900°C, and rapid water cooling after 80 minutes of heat preservation; then tempering, the tempering heating temperature is 500°C.

[0021] The properties after hot rolling and heat treatment are shown in Table 1.

[0022] Table 1

[0023] mechanical properties ...

Embodiment 2

[0025] The composition of this embodiment is: C: 0.23%, Si: 0.67%, Mn: 1.56%, V: 0.016%, Cr: 0.14%, Nb: 0.012%, P: 0.021%, S: 0.007%, and the balance is Fe.

[0026] Hot rolling process: send the steel slab with the above composition into the heating furnace for heating, control the soaking temperature of the steel slab in the heating furnace to 1110-1140 ℃, start rolling temperature 980-1000 ℃, enter the finish rolling temperature 920-940 ℃, spin the wire The temperature is 910-920°C. It is sent into the roller table with a roller table speed of 0.8m / s, and the fan is fully turned off. 10mm wire rod rebar.

[0027] Heat treatment process: Quenching the hot-rolled 10mm wire rod rebar, the quenching heating temperature is 910°C, heat preservation for 80 minutes, and then conduct rapid water cooling; then tempering, the tempering heating temperature is 560°C.

[0028] The properties after hot rolling and heat treatment are shown in Table 2.

[0029] Table 2

[0030] ...

Embodiment 3

[0032] The composition of this example is: C: 0.25%, Si: 0.70%, Mn: 1.57%, V: 0.043%, Cr: 0.11%, Nb: 0.011%, Ni: 0.018%, P: 0.019%, S: 0.015 %, the balance is Fe.

[0033] Hot rolling process: send the billet with the above composition into the heating furnace for heating, control the soaking temperature of the billet in the heating furnace to 1100-1120°C, start rolling at 990-1020°C, weakly cool to 940-950°C after finishing rolling, Send the cooling bed to air-cool to room temperature naturally. 20mm straight rebar.

[0034] Heat treatment process: Quenching the hot-rolled 20mm wire rod and rebar, the quenching heating temperature is 940°C, heat preservation for 80 minutes, and then conduct rapid water cooling; then tempering, the tempering heating temperature is 580°C.

[0035] The properties after hot rolling and heat treatment are shown in Table 3.

[0036] table 3

[0037] mechanical properties Rm / Mpa Rel / Mpa A / % After hot rolling 640-650 485-490 ...

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Abstract

The invention relates to a metal and a production method for the same, and particularly relates to a reinforced bar and a production method for the same, belonging to the technical field of metal and machining. The ingredients of the reinforced bar disclosed by the invention comprise the following elements in percentage by weight: 0.20-0.25% of C, 0.55-0.75% of Si, 1.10-1.65% of Mn, 0.01-0.05% of V, 0.10-0.20% of Cr, 0.01-0.02% of Nb and the balance of Fe and inevitable impurities. The reinforced bar and the production method have the beneficial effects that the dosages of Si, Mn, V, Nb and alloy are reduced; the mechanical properties of the materials are improved via a hot-rolling process and a heat treatment process; the costs of the raw materials can be remarkably reduced; the yield strength of the reinforced bar is increased to 650 Mpa and higher, and the maximum total elongation Agt is not less than 7.5% simultaneously; and the corrosion resistance of the reinforced bar is improved by 2-5 times compared with common reinforced bars. The reinforced bar has great advantages whether in alloy coat or production process, and meets the general development trend of 'energy conservation and consumption reduction' of the present metallurgical industry.

Description

technical field [0001] The invention relates to a metal and a production method thereof, in particular to a steel bar and a production method thereof, belonging to the technical field of metal and processing. Background technique [0002] The production of steel products with excellent performance and low cost has always been the goal pursued by metallurgical enterprises and the driving force for important technological progress, and it is also a long-term issue faced by enterprises. In the total production and consumption of steel products, steel bars for construction occupy a large proportion. With the rapid development of the construction industry, the performance requirements for hot-rolled steel bars are getting higher and higher. Ribbed steel bars with a strength of 500MPa and above have the advantages of high strength, large safety reserve, and saving steel consumption during use. They are suitable for application in high-rise, long-span, railway tracks and other buil...

Claims

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Application Information

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IPC IPC(8): C22C38/26C22C38/38C21D8/08
Inventor 吴锦圆彭家清汪德伟郭峰
Owner JIANGSU YONGGANG GROUP CO LTD
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