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High-strength and high-ductility heat treated steel bar and preparation method thereof

A high-plasticity, high-strength technology, applied in the direction of metal rolling, can solve the problems of large fluctuations in the performance of steel bars, poor temperature gradients, and poor plasticity of steel bars, so as to improve the mechanical properties of materials, improve corrosion resistance, and reduce raw material costs. Effect

Active Publication Date: 2012-11-07
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-time post-rolling rapid cooling process will cause uneven cooling of the ribs and the base circle of the rib base, and there is a temperature gradient difference between the core and the edge of the large section The problem is unfavorable to the structure and toughness, which 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 it is difficult to achieve a yield strength above 600MPa. In addition, the plasticity of the steel bar after ordinary heat treatment is poor. , the elongation after breaking is only 6-7%, and the plasticity is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1, 6.5mm wire rod rebar.

[0012] 6.5mm wire rod rebar has the following mass percentage composition: C: 0.20%, Si: 0.56%, Mn: 1.38%, V: 0.015%, Cr: 0.1%, Nb: 0.014%, P: 0.018%, S: 0.008%, and the balance is Fe.

[0013] The preparation process of the above-mentioned 6.5mm wire rod rebar is as follows.

[0014] Hot rolling process: send the steel slab containing the above ingredients into the heating furnace for heating, control the soaking temperature of the steel slab in the heating furnace to 1080-1130 ℃, start rolling temperature 970-990 ℃, enter and finish rolling temperature 920-930 ℃, spit out Silk temperature 930 ~ 940 ℃. Feed into the Stelmo roller table with a speed of 0.5m / s for cooling; the fans are all turned off. Get 6.5mm wire rod rebar.

[0015] Heat treatment process: Quenching the hot-rolled 6.5mm wire rod and rebar, the quenching heating temperature is 900°C, heat preservation for 90 minutes and then rapid water cooling; then tempering,...

Embodiment 2

[0019] Embodiment two, 10mm wire rod rebar.

[0020] 10mm wire rod rebar has the following mass percentage composition: C: 0.23%, Si: 0.65%, Mn: 1.56%, V: 0.025%, Cr: 0.15%, Nb: 0 .02%, P: 0.021%, S: 0.007%, the amount is Fe.

[0021] The preparation process of the above-mentioned 10mm wire rod rebar is as follows.

[0022] Hot rolling process: send the steel slab containing the above ingredients 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 and finish rolling temperature 920-940 ℃, spit out Silk temperature 910 ~ 920 ℃. Feed into the Stelmo roller table with a speed of 0.8m / s for cooling; the fans are all turned off. Get 10mm wire rod rebar.

[0023] Heat treatment process: Quenching the hot-rolled 10mm wire rod rebar, the quenching heating temperature is 910°C, heat preservation for 85 minutes, and then conduct rapid water cooling; then tempering, ...

Embodiment 3

[0027] Embodiment three, 20mm straight threaded steel.

[0028] 20mm straight rebar has the following mass percentage composition: C: 0.25%, Si: 0.75%, Mn: 1.57%, V: 0.05%, Cr: 0.1%, Nb: 0 .01%, Ni: 0.018%, P: 0.019%, S: 0.015%, and the balance is Fe.

[0029] The preparation process of the above-mentioned 20mm straight rebar is as follows.

[0030] Hot rolling process: Send the billet containing the above ingredients 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, and weakly cool to 940-950°C after finishing rolling , send the cooling bed to air-cool naturally to room temperature. Get 20mm straight rebar.

[0031] Heat treatment process: Quenching the hot-rolled 20mm straight rebar at a quenching temperature of 940°C, keeping it warm for 90 minutes and then performing rapid water cooling; then tempering at a tempering temperature of 580°C. The properties of steel bars a...

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Abstract

The invention discloses a high-strength and high-ductility heat treated steel bar capable of minimizing the amounts of other metal components. The heat treated steel bar comprises the following components: 0.20-0.25% of C, 0.56-0.75% 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, no more than 0.040% of P, no more than 0.040% of S, and the balance of Fe. The invention also discloses a method suitable for preparation of the high-strength and high-ductility heat treated steel bar. The method is as below: a billet is first treated with hot rolling into a straight bar or a steel wire rod by two technologies, and the hot rolling process is designed to ensure the raw materials needed in the heat treatment process to gain good tissue and original performance; and the steel bar is treated with the heat treatment process to further improve performance of the steel bar. Cost of the invention is economical and reasonable; and a product has yield strength higher than 650MPa, and good ductility and corrosion resistance.

Description

technical field [0001] The invention relates to a high-strength and high-plasticity heat-treated steel bar (abbreviated as HTB) and a preparation method thereof, belonging to the technical field of metal materials and processing. It is suitable for concrete components with high strength requirements such as railways and national defense. Background technique [0002] The production of steel with excellent performance and low price has always been the goal pursued by iron and steel enterprises. In the total steel production and consumption, construction steel bars account for 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 yield strength of 500MPa and above have the advantages of high strength, large safety reserves, and saving steel consumption during use. They are suitable for high-rise, long-span, railway track and other buildings. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C22C38/26C22C38/28C22C38/58C22C38/54C22C38/50C22C38/48C21D1/18B21B1/16
Inventor 吴锦圆王进彭家清汪德伟郭峰
Owner JIANGSU YONGGANG GROUP CO LTD
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