Transgender performance of steel plate principle
In recent years, the application of plate steel is a controversial topic, should use steel plate development of desulphurization and deoxidation of steel processing, and performance is to use the plate of degeneration, take the road to micro-alloying? In response, Cheng Guoguang argued that steel is not a panacea, if convinced that it is complementary to other elements of the smelting process additives, can meet the needs of some special steel production in China is sufficient. During the period of creep, HCRCr5Mo galvanized steel pipe deformation twinning and twinning deformation is within the double orientation of slip dislocations; DACr5Mo plate and LTACr5Mo steel during creep has a similar creep life occur, the deformation characteristics of Cr5Mo plate Crystal dislocation glide and twinning deformation, which mainly dominated by twinning deformation LTACr5Mo plate. For refining alternative plate to join statement, Cheng Guoguang disagree.
Most of our special steels using aluminum deoxidation, called Al-killed clean steel, but it produces aluminum oxide inclusions, affecting physical qualities. If using aluminum plate replaced parts, use REAL03 for low hardness characteristics, you can reduce the harm of inclusion, to produce steel grades with special requirements, such as ultra quiet bearing steel. Nippon Steel, ThyssenKrupp and other foreign steel companies are adding steel to produce certain kinds of special steel. Cheng Guoguang is especially optimistic about the application of steel plate in stainless steel, he believes that along with social progress, stainless steel consumption will increase significantly. If you join a plate can reduce precious or harmful elements in stainless steel production added, then great.
Vacuum induction smelting GH4169Cr5Mo steel bars made by hot rolling process, in the process of rolling and start rolling temperature 1100 ℃, final rolling temperature is 1070 ° c, with water to cool to room temperature, known as hot-rolled Cr5Mo plates (HCRCr5Mo plate). Then, at 720 ° c insulation 8h/h furnace cooling to 50 ℃ to 620 c, insulation 8h direct aging treatment, called direct aged Cr5Mo plates (DACr5Mo plate). Zhihou, aged Cr5Mo directly in hot strip rolling steel plate at 680 ° c insulation 300h for long-term aging, known as long term aged Cr5Mo plates (LTACr5Mo plate).
Role of steel in steel with an established, such as stronger than aluminum deoxidation; sulfide hazards can be eliminated in a hot state; can occupy the grain boundaries and effective space to prevent impurities entering; mixed with degeneration characteristics in metallurgical processes. As long as the use of the several features, you can join the plates produce high quality sheet steel, aluminum inclusions such as extremely pure steel, steel plates the harmless steel, steel with high toughness and wear resistance, corrosion-resistant steel. hot rolled steel I beam GH4169Cr5Mo plate organization by size smaller of grain composition, and has obviously of twin Crystal features; HCRCr5Mo plate by directly prescription Hou, grain size no obviously changes, and large small gamma "phase in Cr5Mo plate in the dispersion precipitation, and has twin Crystal features; and long-term prescription State Cr5Mo plate of grain and gamma" phase are slightly has grew up, while has δ phase, and carbide in Cr5Mo plate in the precipitation.
