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Hot rolled strip steel with yield strength higher than 600MPa for mine rescue capsule and preparation method of hot rolled strip steel

A yield strength, hot-rolled strip technology, applied in metal rolling, metal rolling, rolling mill control devices, etc., can solve the problems of complex industrial environment, high temperature strength and corrosion resistance difficult to meet the use requirements of rescue cabins

Inactive Publication Date: 2012-11-07
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex industrial environment downhole, such as the high-temperature gas flow, methane and H 2 S and other corrosive gases, the high temperature strength and corrosion resistance of the existing rescue cabin materials are difficult to meet the requirements of the rescue cabin.

Method used

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  • Hot rolled strip steel with yield strength higher than 600MPa for mine rescue capsule and preparation method of hot rolled strip steel
  • Hot rolled strip steel with yield strength higher than 600MPa for mine rescue capsule and preparation method of hot rolled strip steel
  • Hot rolled strip steel with yield strength higher than 600MPa for mine rescue capsule and preparation method of hot rolled strip steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033](1) According to the set chemical composition: weight percentage C: 0.05%, Si: 0.2%, Mn: 1.5%, Al: 0.01%, Mo: 0.4%, Cr: 0.5%, Nb: 0.04%, Ti: 0.05 %, Cu: 0.2%, P ≤0.01%, S ≤0.01%, the balance is Fe, the molten steel is smelted on a 200-ton converter and cast into a billet of 180 mm×1300 mm×10020 mm;

[0034] (2) Heat the cast slab to 1200°C, keep it warm for 1 h, and roll it on a 2050 mm hot rolling mill for 3 rough rolling passes. the intermediate billet;

[0035] (3) The intermediate slab was finished rolling for 6 passes. The starting temperature of the finish rolling was 950 °C, and the final rolling temperature was 780 °C. Water cooling is adopted between the strip steel and the finishing stand;

[0036] (4) The strip steel after finishing rolling is cooled to 450 °C at a rate of 40 °C / s, and then coiled. The thickness of the final hot-rolled strip product obtained is 4 mm.

[0037] Its metallographic structure is as figure 1 As shown, all are granular bainite st...

Embodiment 2

[0040] (1) According to the set chemical composition: weight percentage C: 0.06%, Si: 0.3%, Mn: 1.6%, Al: 0.04%, Mo: 0.45%, Cr: 0.6%, Nb: 0.05%, Ti: 0.02 %, Cu: 0.25%, P ≤0.01%, S ≤0.01%, and the balance is Fe. The molten steel is smelted on a 200-ton converter and cast into a billet of 200 mm×1300 mm×10020 mm;

[0041] (2) Heat the cast slab to 1230°C, hold it for 1 h, and roll rough rolling on a 2050 mm hot rolling mill for 4 passes. mm intermediate billet;

[0042] (3) Seven passes of finish rolling were carried out on the intermediate slab, the start temperature of finish rolling was 1000 °C, the temperature of finish rolling was 820 °C, the reduction of each pass of finish rolling was controlled at 15-40%, and the thickness of 8 mm was obtained. Water cooling is adopted between the strip steel and the finishing stand;

[0043] (4) The strip after finishing rolling is cooled to 610°C at a rate of 28°C / s, and then coiled. The thickness of the final hot-rolled strip produc...

Embodiment 3

[0047] (1) According to the set chemical composition: weight percentage C: 0.08%, Si: 0.1%, Mn: 1.7%, Al: 0.05%, Mo: 0.5%, Cr: 0.4%, Nb: 0.06%, Ti: 0.04 %, Cu: 0.35%, P ≤ 0.01%, S ≤ 0.01%, the balance is Fe, the molten steel is smelted on a 200-ton converter and cast into a billet of 250 mm×1300 mm×10020 mm;

[0048] (2) Heat the cast slab to 1250 °C, keep it warm for 1 h, and roll rough rolling on a 2050 mm hot rolling mill for 5 passes. mm intermediate billet;

[0049] (3) The intermediate slab was finished rolling for 5 passes, the starting temperature of the finish rolling was 1030 °C, and the final rolling temperature was 860 °C. Water cooling is adopted between the strip steel and the finishing stand;

[0050] (4) The finished strip is cooled to 700°C at a rate of 10°C / s, and then coiled, and the thickness of the final hot-rolled strip product obtained is 14 mm.

[0051] Its metallographic structure is as image 3 As shown, it is mainly granular bainite, mixed with a...

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Abstract

A hot rolled strip steel with yield strength higher than 600MPa for a mine rescue capsule and a preparation method of the hot rolled strip steel belongs to the technical field of metallurgy materials. The hot rolled strip steel comprises, by weight percent, 0.04-0.08% of C, 0.1-0.3% of Si, 1.5-1.7% of Mn, 0.01-0.05% of Al, 0.4-0.5% of Mo, 0.4-0.6% of Cr, 0.04-0.06% of Nb, 0.02-0.05% of Ti, 0.2-0.35 of Cu, not more than 0.01% of P, not more than 0.01% of S, and the balance Fe. A metallographic structure of the hot rolled strip steel is granular bainite with the yield strength no less than 600MPa, tensile strength no less than 800MPa, and elongation percentage after fracture no less than 18% at room temperature. The yield strength is no less than 450MPa, tensile strength is no less than 650MPa, and elongation percentage after fracture is no less than 19% at a high temperature of 500 DEG C. Impact energy at 20 DEG C is larger than 47J. Cold bending property is qualified. Atmospheric corrosion resistance index I under industrial environments is no less than 4.5. Sensitivity coefficient Pcm of welding cold crack is not more than 0.26%. The preparation method includes: smelting molten steel according to the preset components, casting ingots, heating, rough rolling, finish rolling to obtain the strip steel with thickness of 4-14mm, and fast cooling to obtain the finished hot rolled strip steel. The hot rolled strip steel has fine room-temperature and high-temperature mechanical performance and fine erosion resistance.

Description

technical field [0001] The invention belongs to the technical field of metallurgical materials, and in particular relates to a hot-rolled steel strip for a mine rescue cabin with a yield strength higher than 600 MPa and a preparation method thereof. Background technique [0002] Mine rescue cabin is a modern safety guarantee equipment to protect underground miners from accidents. In recent years, the market demand for rescue cabins in the mine industry is increasing, and the development prospect of mine rescue cabin equipment manufacturing industry is broad. [0003] At present, the steel materials used in the cabin of the mine rescue cabin are mainly ordinary carbon structural steel such as 45 steel, Q235, Q345 and Q460, and low-alloy high-strength steel. The yield strength of these materials is 200-500MPa, and the toughness and bending indicators basically meet Require. However, due to the complex industrial environment downhole, such as the high-temperature gas flow, met...

Claims

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Application Information

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IPC IPC(8): C22C38/38B21B37/00
Inventor 李长生马彪李涛
Owner NORTHEASTERN UNIV
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