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

An ultra-high-strength, manufacturing method technology, applied in metal rolling, manufacturing tools, temperature control, etc., can solve the problems of increased material cost, complex metallurgical process, complex production process, etc., to achieve low production cost, simple metallurgical process, The effect of process simplification

Active Publication Date: 2011-05-11
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
  • 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] Smelt molten steel in a vacuum electromagnetic induction furnace according to the chemical composition shown in Table 1, and cast it into continuous casting slabs or steel ingots, heat the continuous casting slabs or steel ingots to 1250-1300 °C, keep it warm for 130 minutes, and homogenize the structure; then forge , forging temperature ≥ 1200 ℃, forging 50 × 50 ± 1mm 2 of rectangular billets. Then carry out hot rolling and rough rolling, the temperature range of rough rolling is 1130~1150 ℃, and roll into a bar of φ22±0.5mm. The temperature range of finish rolling is 1000~1050℃, and the wire rod of φ10±0.3mm is rolled on the continuous rolling mill. Finally, Stelmo spinning and rapid cooling are carried out. The spinning temperature range is 830-870°C, and the spinning specification is φ7±0.3mm. After spinning, the wire is rapidly cooled, and the cooling rate is 10°C / s.

Embodiment 2

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

Embodiment 3

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

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

[0040] Element

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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 its manufacturing method, in particular, the present invention relates to 2200MPa class ultra-high-strength hot-rolled wire rod and its manufacturing method. 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 has increased in order to achieve sustainable development that saves resources and protects the environment. Ultra-high-strength steel is a high-strength, high-toughness alloy steel developed on the basis of alloy structural steel. The thermal processing process is simple and the cost is relatively low. It has been widely used by aviation and aerospace departments. the key material. Ultra-high-strength steels are more sensitive to hydrogen than normal-strength steels, and hydrogen-induced fractures may occur during use. Studies have shown that different...

Claims

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Application Information

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Patent Type & Authority Patents(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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