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Structural steel plate Q345Qdz35 steel for extra-thick bridge and production method thereof

A q345qdz35, structural steel plate technology, applied in the direction of rolling force/roll gap control, temperature control, process efficiency improvement, etc., can solve the problems of inability to produce, difficult production, etc., and achieve large margin, impact performance and Z direction performance uniform effect

Inactive Publication Date: 2012-02-08
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As for the performance-guaranteed and flaw-detection Q345q series structural steel plates for bridges with a thickness of more than 100mm, they cannot be produced due to the difficulty in production and the special requirements for process equipment. There is no relevant performance standard in the national standard.

Method used

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  • Structural steel plate Q345Qdz35 steel for extra-thick bridge and production method thereof
  • Structural steel plate Q345Qdz35 steel for extra-thick bridge and production method thereof
  • Structural steel plate Q345Qdz35 steel for extra-thick bridge and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Through converter smelting, LF refining, vacuum refining, pouring, heating, rolling, controlled cooling, slow cooling, and heat treatment processes, Q345qDZ35 finished steel with the chemical composition described in Table 1 is obtained, and the process parameters and mechanical properties are shown in Table 4 below. , 5, 6.

[0026] Table 1 Chemical Composition of Steel in Example 1

[0027] C Si mn P S ALS Nb Ti Cr Ni Cu CEV 0.130 0.37 1.48 0.015 0.001 0.034 0.038 0.020 0.068 0.017 0.026 0.39

Embodiment 2

[0029] Through converter smelting, LF refining, vacuum refining, pouring, heating, rolling, controlled cooling, slow cooling, and heat treatment processes, Q345qDZ35 finished steel with the chemical composition described in Table 2 is obtained, and the process parameters and mechanical properties are shown in Table 4 below. , 5, 6.

[0030] Table 2 Chemical Composition of Steel in Example 2

[0031] C Si mn P S ALS Nb Ti Cr Ni Cu CEV 0.127 0.30 1.49 0.016 0.002 0.036 0.039 0.025 0.055 0.013 0.019 0.39

Embodiment 3

[0032] Example 3 Through converter smelting, LF refining, vacuum refining, pouring, heating, rolling, controlled cooling, slow cooling, and heat treatment processes, Q345QDZ35 finished steel with chemical composition as described in Table 3 below is obtained, wherein the process parameters and mechanical properties are shown in See Tables 4, 5, and 6 below.

[0033] Table 3 Chemical Composition of Steel in Example 3

[0034] C Si mn P S ALS Nb Ti Cr Ni Cu CEV 0.135 0.33 1.5 0.018 0.001 0.038 0.038 0.026 0.059 0.014 0.029 0.40

[0035] 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.

[0036...

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PUM

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Abstract

The invention discloses a structural steel plate Q345Qdz35 steel plate for extra-thick bridges and a production method thereof, and the steel plate comprises the following chemical components by mass: 0.10-0.18 parts of C, 0.20-0.50 parts of Si, 1.30-1.60 parts of Mn, not more than 0.018 parts of P, not more than 0.005 parts of S, 0.030-0.060 parts of micro-alloying element Nb, 0.015-0.030 parts of Ti, not more than 0.12 parts of (Nb+Ti), not more than 0.020-0.050 parts of Al, and the balance of Fe and residual elements. The production method adopted by the invention comprises the following steps of: converter smelting, LF refining, vacuum refining, casting, heating, rolling, controlled cooling, slow cooling, heat treatment. The invention formulates a strict process point control standard for the whole production process from molten iron pretreatment to steel plate heat treatment, and strictly executes the standard; the real quality performance of the product has great surplus amounts, wherein the yield surplus amount is 30-70 Mpa; the tensile urplus amount is 30-60 MPa; the elongation surplus amount is 5-10%; and the impact property and the Z-direction performance are uniform and have great surplus amounts.

Description

technical field [0001] The invention relates to steel products, in particular to an extra-thick structural steel plate Q345qDZ35 for bridges and a production method thereof. technical background [0002] At present, the domestic market demand for high-performance bridge steel is mainly Q345q series. In terms of performance and use, the main performance is that the strength level and toughness are continuously improved, and the welding performance is continuously improved. In particular, the thickness of the steel plate is also gradually increased. As for the performance-guaranteed and flaw-detection Q345q series structural steel plates for bridges with a thickness of more than 100mm, they cannot be produced because of the difficulty in production and the special requirements for process equipment. 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 an extra-thick...

Claims

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Application Information

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IPC IPC(8): C22C38/14C22C38/12C22C38/06C22C38/04C21C7/076C21C7/10C21D1/28C21D8/02B21B37/58B21B37/74
CPCY02P10/20
Inventor 朱书成张涛许少普崔冠军杨东唐郑磊李红阳徐昭庞林李忠波张强孙炳红康文举
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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