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Ultra-high strength hot rolling wire rod of 2200 Mpa level and manufacture method thereof

A manufacturing method and wire rod technology, applied in metal rolling, manufacturing tools, temperature control and other directions, can solve the problems of complex production process, increase material cost, complex metallurgical process, etc., and achieve simple metallurgical process, low production cost, and technological process. Simplified effect

Active Publication Date: 2009-11-25
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of alloying strengthening technology are: adding a large amount of alloying elements will increase the material cost and make the metallurgical process complicated
The invention adds more alloying elements, and the cost is higher; the steel needs rapid cooling and low-temperature tempering treatment, and the plasticity is poor; in addition, quenching and tempering treatment make the production process complicated

Method used

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  • Ultra-high strength hot rolling wire rod of 2200 Mpa level and manufacture method thereof
  • Ultra-high strength hot rolling wire rod of 2200 Mpa level and manufacture method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] According to the chemical composition shown in Table 1, molten steel is smelted in a vacuum electromagnetic induction furnace and cast into a continuous casting billet or steel ingot. The continuous casting billet or steel ingot is heated to 1250~1300℃, and the temperature is kept for 130 minutes to homogenize the structure; then forging , Forging temperature ≥1200℃, forging into 50×50±1mm 2 Rectangular billet. Then, it is hot-rolled and rough-rolled, and the rough-rolling temperature ranges from 1130 to 1150°C, and it is rolled into a bar of φ22±0.5mm. The finishing rolling temperature range is 1000~1050℃, and it is rolled into φ10±0.3mm wire rod on the continuous rolling mill. Finally, Steyrmo spinning and rapid cooling are carried out. The spinning temperature ranges from 830 to 870°C, and the spinning specification is φ7±0.3mm. After spinning, the wire is rapidly cooled at a cooling rate of 10°C / s.

Embodiment 2

[0036] The implementation mode is the same as in Example 1, where the heating temperature is 1250~1300℃, and the heat preservation is 140 minutes; the forging temperature is ≥1200℃, and the forging is 50×50±1mm 2The rough rolling start temperature range is 1130~1150℃, and it is rolled into φ22±0.5mm bar. The finishing rolling temperature range is 1000~1050℃, and it is rolled into φ10±0.3mm wire rod on the continuous rolling mill. The spinning temperature range of Steyrmo is 830~870℃, and the spinning specification is φ7±0.3mm. After spinning, the wire is rapidly cooled, and the cooling rate is 9℃ / s.

Embodiment 3

[0038] The implementation mode is the same as that in Example 1, where the heating temperature is 1250~1300℃, and the temperature is kept for 150 minutes; the forging temperature is ≥1200℃, and the forging is 50×50±1mm 2 Rectangular billet; the rolling start temperature range is 1130~1150℃, and it is rolled into φ22±0.5mm bar. The finishing rolling temperature range is 1000~1050℃, and it is rolled into φ10±0.3mm wire rod on the continuous rolling mill. The spinning temperature range of Steyrmo is 830~870℃, and the spinning specification is φ7±0.3mm. After spinning, the wire is rapidly cooled, and the cooling rate is 11℃ / s.

[0039] Table 1 The chemical composition (wt%) of the hot-rolled wire rod of the comparative example of the present invention and Examples 1-3

[0040] Ingredients

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Abstract

The invention provides an ultra-high strength hot rolling wire rod of 2200 Mpa level and a manufacture method thereof. The ultra-high strength hot rolling wire rod of 2200 Mpa level comprises the following chemical components by weight percentage: 0.40 to 0.60 percent of C, 2.5 to 4.0 percent of Si, 3.0 to 5.0 percent of Mn, 0.40 to 0.60 percent of Mo, and the balance of Fe and unavoidable impurities. The invention adopts Mn-Si-Mo line components, and obtains the hot rolling wire rod taking a nanometer scale martensite structure as the characteristic through purification smelting, forging, rough rolling, finish rolling and the silking technology with the width of a martensite slab of about 5 to 15 nm. The ultra-high strength hot rolling wire rod has the steel yield strength no less than 1900 Mpa, the tensile strength no less than 2200 Mpa, the yield ratio no less than 0.85 percent, the elongation no less than 8.0 percent and the reduction of area no less than 40 percent.

Description

Technical field [0001] The present invention relates to high-strength steel and a manufacturing method thereof. Specifically, the present invention relates to a 2200MPa ultra-high-strength hot-rolled wire rod and a manufacturing method thereof. Background technique [0002] In recent years, with the rapid growth of industries such as bridges, automobiles, and machinery manufacturing, the demand for high-strength wire and bar steel is increasing in order to achieve sustainable development that saves resources and protects the environment. Ultra-high-strength steel is a kind of high-strength, high-toughness alloy steel developed on the basis of alloy structural steel. It has simple thermal processing technology and relatively low cost. It has been widely used by aviation and aerospace departments and is used to manufacture cutting-edge defense weapons. Key material. Compared with ordinary strength steel, ultra-high strength steel is more sensitive to hydrogen, and hydrogen-induced ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12B21B45/02B21B37/74
Inventor 刘俊亮王军艺
Owner BAOSHAN IRON & STEEL CO LTD
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