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Q345qENH weather-resistant bridge steel plate with thickness smaller than or equal to 50 mm and production method thereof

A steel plate and weather-resistant technology, which is applied in the field of Q345qENH weather-resistant bridge steel plate and its production, can solve the problem that the paint-free weather-resistant bridge steel has not been widely promoted, so as to improve welding performance and welding crack resistance, not easy to rebound, and improve atmospheric resistance The effect of corrosion performance

Inactive Publication Date: 2019-12-13
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in our country, the coating-free weather-resistant bridge steel has not been widely promoted.

Method used

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  • Q345qENH weather-resistant bridge steel plate with thickness smaller than or equal to 50 mm and production method thereof
  • Q345qENH weather-resistant bridge steel plate with thickness smaller than or equal to 50 mm and production method thereof
  • Q345qENH weather-resistant bridge steel plate with thickness smaller than or equal to 50 mm and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] Example 1: Steel grade Q345qENH, production thickness 16mm.

[0029] 1. This example contains the following chemical components:

[0030] C:0.05%;Si:0.30%;Mn:1.13%;P:0.015%;S:0.003%;Als:0.032%;V:0.016%;Ti:0.009%;Cr:0.42%;Ni:0.37%; Nb: 0.029%; Cu: 0.34%; B: 0.00032%; N: 0.0049%; H: 0.0002%; others are Fe and residual elements. in:

[0031] Nb+V+Ti=0.054%, ≤0.15%

[0032] Carbon equivalent CEV(%)=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15=0.373

[0033] Crack sensitivity coefficient Pcm(%)=C+Si / 30+(Mn+Cu+Cr) / 20+Mo / 15+Ni / 60+V / 10+5B=0.16

[0034] Atmospheric corrosion resistance index I=26.01(%Cu)+3.88(%Ni)+1.20(%Cr)+1.49(%Si)+17.28(%P)-7.29(%Cu)(%Ni)-9.10(%Ni )(%P)-33.39(%Cu) 2 =6.66

[0035] 2. The production method of this example (implementation of actual process parameters):

[0036] (1) Steel billet heating: In order to ensure that the steel billet is thoroughly burned, and at the same time, the temperature is uniform to facilitate rolling, the steel billet is heated in th...

example 2

[0058] Example 2: Steel grade Q345qENH, production thickness 30mm.

[0059] 1. This example contains the following chemical components:

[0060] C:0.06%;Si:0.32%;Mn:1.12%;P:0.013%;S:0.002%;Als:0.036%;V:0.015%;Ti:0.010%;Cr:0.41%;Ni:0.34%; Nb: 0.033%; Cu: 0.32%; B: 0.0003%; N: 0.0056%; H: 0.0002%; others are Fe and residual elements. in:

[0061] Nb+V+Ti=0.058%, ≤0.15%

[0062] Carbon equivalent CEV(%)=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15=0.376

[0063] Crack sensitivity coefficient Pcm(%)=C+Si / 30+(Mn+Cu+Cr) / 20+Mo / 15+Ni / 60+V / 10+5B=0.17

[0064] Atmospheric corrosion resistance index I=26.01(%Cu)+3.88(%Ni)+1.20(%Cr)+1.49(%Si)+17.28(%P)-7.29(%Cu)(%Ni)-9.10(%Ni )(%P)-33.39(%Cu) 2 =6.58

[0065] 2. The production method of this example (implementation of actual process parameters):

[0066] (1) Steel billet heating: In order to ensure that the steel billet is thoroughly burned, and at the same time, the temperature is uniform to facilitate rolling, the steel billet is heated in thr...

example 3

[0088] Example 3: Steel grade Q345qENH, production thickness 50mm.

[0089] 1. This example contains the following chemical components:

[0090] C:0.05%;Si:0.39%;Mn:1.15%;P:0.016%;S:0.002%;Als:0.033%;V:0.019%;Ti:0.008%;Cr:0.43%;Ni:0.38%; Nb: 0.031%; Cu: 0.31%; B: 0.00046%; N: 0.0029%; H: 0.0002%; others are Fe and residual elements. in:

[0091] Nb+V+Ti=0.058%, ≤0.15%

[0092] Carbon equivalent CEV(%)=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15=0.377

[0093] Crack sensitivity coefficient Pcm(%)=C+Si / 30+(Mn+Cu+Cr) / 20+Mo / 15+Ni / 60+V / 10+5B=0.17

[0094] Atmospheric corrosion resistance index I=26.01(%Cu)+3.88(%Ni)+1.20(%Cr)+1.49(%Si)+17.28(%P)-7.29(%Cu)(%Ni)-9.10(%Ni )(%P)-33.39(%Cu) 2 =6.79

[0095] 2. The production method of this example (implementation of actual process parameters):

[0096] (1) Steel billet heating: In order to ensure that the steel billet is thoroughly burned, and at the same time, the temperature is uniform to facilitate rolling, the steel billet is heated in th...

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Abstract

The invention discloses a Q345qENH weather-resistant bridge steel plate with the thickness smaller than or equal to 50 mm. The Q345qENH weather-resistant bridge steel plate comprises the chemical compositions including C, Si, Mn, P, S, Als, V, Ti, Cr, Ni, Nb, Cu, N, B, H and the balance Fe and residual elements. According to the Q345qENH weather-resistant bridge steel plate, the contents of elements such as B, N, H, Ti and S are controlled, so that the carbon equivalent and the crack sensitivity coefficient of the steel plate are greatly reduced, and the welding performance and the welding crack resistance of the steel plate are improved. The corrosion resistance index can be greatly increased, and the atmospheric corrosion resistance of the steel plate is improved. Phased control over theheating temperature and the heating time is beneficial to control over hot cracks, meanwhile, a billet is uniformly burned thoroughly, and deformation is facilitated. Matching of comprehensive properties such as tensile properties, low-temperature impact performance, cold bending performance and failure impact performance of the steel plate can be achieved. It is ensured that the shape of the steel plate is straight in the subsequent cutting process, and the plate shape problems such as rebound, warpage and distortion are not prone to being caused.

Description

technical field [0001] The invention belongs to the technical field of weather-resistant bridge steel production, and in particular relates to a Q345qENH weather-resistant bridge steel plate with a thickness less than or equal to 50 mm and a production method thereof. Background technique [0002] Bridge steel is required to have high strength, toughness and withstand the load and impact of rolling stock, as well as good fatigue resistance, certain low temperature toughness and atmospheric corrosion resistance. With the development of domestic railway construction in the direction of high speed and heavy load, railway steel bridges develop in the direction of high speed, heavy load, large span, beautiful and novel structure, and full welding, which puts forward higher requirements for the performance of bridge steel. In particular, the development of cross-sea bridges has put forward higher requirements for the corrosion resistance of bridge steel. [0003] Domestic researc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/46C22C38/50C22C38/48C22C38/42C21D8/02
CPCC21D8/0226C21D8/0247C21D2211/002C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/06C22C38/42C22C38/46C22C38/48C22C38/50Y02P10/20
Inventor 许少普张涛袁书欣朱书成李忠波康文举唐郑磊刘庆波张占杰袁继恒杨阳张国栋朱先兴蒋鹏薛艳生王英杰符可义李亮郑海明陈良全微波袁永旗庞百鸣袁高俭白艺博杨春王希彬吕玉良于飒任义
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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