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Hot-rolled H-shaped steel with good low-temperature ductility at minus 60 DEG C and production method thereof

A technology of low temperature toughness and production method, which is applied in the field of metal material production to achieve the effect of reducing costs, reducing post-weld visual inspection and welding seam inspection processes, and reducing welding processes.

Inactive Publication Date: 2017-10-03
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the object of this patent is the steel plate produced by continuous casting slab, which is quite different from the H-beam produced by special-shaped slab in technology, and mainly involves the low temperature impact requirement of -40°C

Method used

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  • Hot-rolled H-shaped steel with good low-temperature ductility at minus 60 DEG C and production method thereof
  • Hot-rolled H-shaped steel with good low-temperature ductility at minus 60 DEG C and production method thereof
  • Hot-rolled H-shaped steel with good low-temperature ductility at minus 60 DEG C and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A hot-rolled H-shaped steel with good low-temperature toughness at -60°C, containing the following elements by weight: 0.10% carbon, 0.28% silicon, 1.41% manganese, 0.010% phosphorus, 0.008% sulfur, 0.045% vanadium, and 0.025% niobium , Nickel 0.15%, Als 0.020%.

[0023] The production process is controlled as follows: the heating temperature is controlled at 1220-1240°C, the starting rolling temperature is controlled at 1120°C, the opening rolling temperature of the universal rolling pass is controlled at 940°C, and the final rolling temperature is controlled at 860°C; The cooling rate is controlled at 52%; cooling process control: the rolled piece is cooled at a rate of 65°C / s to a phase transformation around 640°C, returned to 680°C, and then naturally cooled to room temperature.

[0024] The hot-rolled H-shaped steel of 428 × 407 × 20 × 35 specifications produced by the process of the present invention, the grain size of 100x is as image 3 As shown; its tensile st...

Embodiment 2

[0026] A hot-rolled H-shaped steel with good low-temperature toughness at -60°C, containing the following elements by weight: 0.10% carbon, 0.25% silicon, 1.35% manganese, 0.007% phosphorus, 0.005% sulfur, 0.036% vanadium, and 0.020% niobium , Nickel 0.13%, Als 0.022%.

[0027] The production process is controlled as follows: the heating temperature is controlled at 1220-1240°C, the starting rolling temperature is controlled at 1100°C, the opening rolling temperature of the universal rolling pass is controlled at 925°C, and the final rolling temperature is controlled at 842°C; The cooling rate is controlled at 55%; the cooling process control: the rolled piece is cooled at a rate of 57 °C / s to a phase change near 600 °C, returned to 658 °C, and then naturally cooled to room temperature.

[0028] The hot-rolled H-shaped steel of 400 * 400 * 13 * 21 specifications produced by the process of the present invention, the grain size of 100x is as figure 2 As shown; its tensile stre...

Embodiment 3

[0030] A hot-rolled H-shaped steel with good low-temperature toughness at -60°C, containing the following elements by weight: 0.10% carbon, 0.28% silicon, 1.41% manganese, 0.010% phosphorus, 0.008% sulfur, 0.045% vanadium, and 0.025% niobium , Nickel 0.15%, Als 0.020%.

[0031] The production process is controlled as follows: the heating temperature is controlled at 1220-1240°C, the starting rolling temperature is controlled at 1120°C, the opening rolling temperature of the universal rolling pass is controlled at 940°C, and the final rolling temperature is controlled at 860°C; The cooling rate is controlled at 52%; cooling process control: the rolled piece is cooled at a rate of 65 °C / s to a phase transformation around 640 °C, returned to 680 °C, and then naturally cooled to room temperature.

[0032] The hot-rolled H-shaped steel of 194 * 150 * 6 * 9 specifications produced by the process of the present invention, 100x grain size such as figure 1 As shown; its tensile streng...

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Abstract

The invention provides hot-rolled H-shaped steel with good low-temperature ductility at minus 60 DEG C and a production method thereof. The hot-rolled H-shaped steel is prepared from, by weight, 0.07%-0.15% of carbon, 0.15%-0.35% of silicon, 1.00%-1.45% of manganese, smaller than or equal to 0.020% of phosphorus, smaller than or equal to 0.015% of sulphur, 0.020%-0.060% of vanadium, 0.010%-0.060% of niobium, 0.10%-0.25% of nickel, smaller than or equal to 0.015% of Als, the balance iron and unavoidable impurities. Compared with the prior art, the H-shaped steel produced through the method has the extremely low ductile-brittle transition temperature and the good low-temperature ductility, the welding procedure and the procedures of visual inspection and weld seam detection after welding are reduced, and the cost of steel per ton can be reduced by 500 yuan or above.

Description

technical field [0001] The invention belongs to the technical field of metal material production, and in particular relates to a hot-rolled H-shaped steel with good low-temperature toughness at -60°C and a production method thereof. Background technique [0002] In recent years, the exploitation of energy has shifted from regions with favorable environmental conditions to the Arctic region with harsh climate. Since the Arctic region is an alpine region with harsh climate conditions, the oil and gas extraction devices built or used in the Arctic and other alpine regions must have high low temperature resistance characteristics. , The steel structural materials used must have excellent low-temperature impact toughness requirements under severe cold conditions below -50°C to 60°C. [0003] The H-shaped steel produced according to the general H-shaped steel production process has a ductile-ductile-brittle transition temperature of about -10°C. If it is used in alpine regions and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/08C22C38/06C21D8/00
CPCC22C38/04C21D8/005C21D2211/005C21D2211/009C22C38/02C22C38/06C22C38/08C22C38/12
Inventor 吴保桥龚庆华张卫斌彦井成吴湄庄吴坚邢军夏勐蒲玉梅张步海柏胜
Owner MAANSHAN IRON & STEEL CO LTD
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