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| No.12911792
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Information Name: | Supply 1Cr5Mo alloy tube, spot wholesale and retail |
Published: | 2014-04-22 |
Validity: | 3000 |
Specifications: | Complete |
Quantity: | 160.00 |
Price Description: | |
Detailed Product Description: | 1Cr5Mo hydrogen alloy tube, the polymerization of the hydrogen molecule, causing stress concentration than the ultimate strength of the alloy tube 1Cr5Mo in 1Cr5Mo alloy small cracks are formed inside the tube, also known as the white point. Hydrogen embrittlement can only prevent, can not cure. Hydrogen embrittlement once produced, it can not be eliminated. 1Cr5Mo alloy tube into the interior of trace hydrogen (10-6) in the smelting process materials and manufacturing processes and assembly 1Cr5Mo alloy tube (e.g., plating, welding) in or at an internal residual stress applied to cause embrittlement of the material even cracking. In the case of cracking can not yet handle by dehydrogenation (eg heated to above 200 ℃ for several hours, the hydrogen can decrease) recovery performance 1Cr5Mo alloy tube. Therefore, in the hydrogen embrittlement is reversible. 1Cr5Mo alloy tube embrittlement mechanism of hydrogen embrittlement mechanism academia is controversial, but most scholars believe that the following effects are the main reason for the occurrence of hydrogen embrittlement: In 1Cr5Mo tube alloy solidification process, into which hydrogen could not timely release, spread to nearby 1Cr5Mo alloy tube defects, when hydrogen atoms bonded to room temperature defects into molecular hydrogen and continue to gather, resulting in enormous internal pressure, the metal cracking. Hydrocracking in the petroleum industry in the furnace, the operating temperature of 300-500 degrees, a hydrogen pressure of up to several hundreds atmospheric pressure, then the hydrogen in the alloy tube can penetrate 1Cr5Mo chemical reaction with the carbon to methane. Methane bubbles can place inclusions in steel or grain boundary nucleation, growth, and produce high-pressure alloy pipe leading to 1Cr5Mo damage. Under stress, the hydrogen in the solid solution alloy tube 1Cr5Mo may also cause embrittlement. 1Cr5Mo alloy tube according to certain rules atoms periodically arranged together is called the lattice. Hydrogen atoms generally in the gap between the metal atoms, localized generation atomic lattice dislocations is called staggered hydrogen atoms tend to clump near dislocations. When the external force to the metal material, the stress distribution is not uniform inside the material, the material rapidly transition region inside the shape or material defects and micro cracks may occur at the stress concentration. Hydrogen atom diffusion or dislocation motion to follow the stress concentration area under stress gradient effect in the crystal lattice. Due to the interaction of atomic hydrogen and alloy pipe 1Cr5Mo make the binding force between the metal atoms becomes weak, so that a high hydrogen District will crack initiation and expansion, leading to brittle fracture. Further, since the hydrogen concentration in the stress concentration to promote the plastic deformation region, thereby generating cracks and expansion. Also, there are many micro-cracks in the crystal, the hydrogen adsorption aggregation crack crack surface, the surface can be reduced, so cracks tend to expand. Some 1Cr5Mo alloy tube and have a greater affinity for hydrogen, hydrogen oversaturated with such 1Cr5Mo alloy tube hydride generation atomic easy to combine, or high concentrations of hydrogen under loads of stress concentration area gathered with the metal atoms combine to generate hydride. Hydride is a brittle phase structure, the external force tends to become a source of fracture, leading to brittle fracture. |
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Copyright © GuangDong ICP No. 10089450, Wuxi City, Del Run Steel Materials Co., Ltd. All rights reserved.
Technical support: ShenZhen AllWays Technology Development Co., Ltd.
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You are the 13745 visitor
Copyright © GuangDong ICP No. 10089450, Wuxi City, Del Run Steel Materials Co., Ltd. All rights reserved.
Technical support: ShenZhen AllWays Technology Development Co., Ltd.
AllSources Network's Disclaimer: The legitimacy of the enterprise information does not undertake any guarantee responsibility