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Q345GJ series structural steel plates for ultra-thick building and production method thereof

A technology of Q345GJ, structural steel plate, applied in the direction of temperature control, etc., can solve problems such as difficulty in production

Inactive Publication Date: 2011-06-01
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Q345GJ series structural steel plates with a thickness of more than 100mm and guaranteed performance and flaw detection cannot be produced due to the difficulty of production and special requirements for process equipment. There is no relevant performance standard in the national standard.

Method used

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  • Q345GJ series structural steel plates for ultra-thick building and production method thereof
  • Q345GJ series structural steel plates for ultra-thick building and production method thereof
  • Q345GJ series structural steel plates for ultra-thick building and production method thereof

Examples

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Embodiment 1

[0024] Through converter smelting, LF refining, vacuum refining, pouring, heating, rolling, controlled cooling, slow cooling, and heat treatment processes, the Q345GJCZ35 finished steel with the chemical composition described in Table 1 below is obtained, and the process parameters and mechanical properties are shown in Table 4 below. , 5, 6.

[0025] Table 1 Chemical composition of steel in Example 1

[0026]

Embodiment 2

[0028] Through converter smelting, LF refining, vacuum refining, pouring, heating, rolling, controlled cooling, slow cooling, and heat treatment processes, the Q345GJCZ35 finished steel with the chemical composition described in Table 2 below is obtained, and the process parameters and mechanical properties are shown in Table 4 below. , 5, 6.

[0029] Table 2 Chemical Composition of Steel in Example 2

[0030]

Embodiment 3

[0031] Example 3 Through converter smelting, LF refining, vacuum refining, pouring, heating, rolling, controlled cooling, slow cooling, and heat treatment processes, Q345GJCZ35 finished steel with the chemical composition described in Table 3 below is obtained, wherein the process parameters and mechanical properties are shown in See Tables 4, 5, and 6 below.

[0032] Table 3 Chemical Composition of Steel in Example 3

[0033]

[0034] The process route of the present invention: molten iron KR deep desulfurization→converter smelting→LF refining→VD vacuum treatment→casting ingot pouring→steel ingot slow cooling→heating→phosphorus removal→controlled rolling→controlled cooling→controlled straightening→off-line slow cooling →surface inspection→heat treatment→finishing→flaw detection→testing→judgment→qualified product storage.

[0035] Steel-making composition design: Due to the thick thickness of the steel plate, it is difficult and important to ensure flaw detection and mecha...

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Abstract

The invention discloses a Q345GJ series structural steel plates for an ultra-thick building and a production method thereof. In the Q345GJ series steel plate, the yield strength is controlled at 335-420MPa, the tensile strength is controlled at 505-585MPa, the elongation ratio is controlled at 25-29%, the V-shaped shock power at 0 DEG C is controlled at 156-190J, the yield ratio is 0.62-0.81 and is 0.69 in average, the single lamellar tearing resisting capacity is 32-48% and is 40.2% in average, and the performance indexes completely satisfy the Q345GJCZ35 development requirement. In addition, the steel plate tissues subjected to controlled rolling are ferrite and pearlite and has the grain size up to 8-9 level. After normalizing treatment, the ferrite and pearlite tissues in the steel plate are more uniform, and the grains are refined to reach 10.5 level.

Description

technical field [0001] The invention relates to steel products, in particular to a Q345GJ series of extra-thick structural steel plates for construction and a production method thereof. technical background [0002] Q345GJ series steel plate is a kind of extra-thick structural steel plate for construction. It has high strength, good cold deformation ability, good plasticity and toughness, and lamellar tear resistance. It is widely used in the construction field. There has been a ton of research. However, the performance-guaranteed and flaw-detectable Q345GJ series structural steel plates for construction with a thickness of more than 100 mm cannot be produced due to reasons such as difficult production and special requirements for process equipment, and there is no relevant performance standard in the national standard. Contents of the invention [0003] Therefore, the object of the present invention is to provide a Q345GJ series steel plate for extra-thick construction s...

Claims

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Application Information

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IPC IPC(8): C22C38/12C21C7/00C21C7/10B21B37/74C21D1/28
Inventor 张涛朱书成许少普张立新崔冠军杨东唐郑磊李红洋康文举徐昭庞林白艺博
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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