Microalloy steel solders the new challenge of research

0ppm as foreign matter element reduce substantially, crystallization crackle occurence rate is reduced greatly subsequently, make the focal point that people pays close attention to and studies no longer. As a result of the requirement that the structure when using designs, of armor plate board thick direction function nots allow to ignore. Eliminate what analyse technology slants among the base that connect casting to become better day by day, reduce greatly slant analyse degree, improved thick board Z tropism can. 2 control rolling and the development that control refrigeration controls cooling technology drove the progress of rolling technology, make control rolling and control refrigeration to be united in wedlock effectively, combinative result makes steel is planted composition is more simple, plate integral performance rises further. Use medium ceaseless maturity in steel rolling as automation control technology at the same time, produce the product of high quality, high accuracy conditionally. Microalloy changes technical union to accuse make friends cold, deformation heat treatment comes true below controlled condition, have deformation aggrandizement, separate out aggrandizement and photograph to change the integrated action of aggrandizement, can obtain change processing of law, normalizing and attune to be handled character than alloy, tenacity of better plasticity, low temperature, high intensity, more important because carbolic equivalent Ceq and crackle are sensitive,be of exponential Pcm reduce, weldability can rise greatly, gradually by but solder develops to easy solder direction. At present hot-rolling large board makes the control rolling that is used extensively (TM) have normalizing rolling, control rolling (weigh CR again, cent is two phase rolling and 3 phase rolling) ; Control cooling craft to have cool quickly (ACC) and quench directly (DQ) ; Control rolling and union of control refrigeration craft form TMCP craft. Japan already used TMCP craft production to go out succumb the structural steel of intensity 570MPa, use at bridge, pressure vessel and cop, ensure 75mm armor plate solders without crackle of the warm-up, hole that do not have arc. Developing with same technology at the same time succumb the structural steel of intensity 690MPa. The advantage that steel solders uses new-style microalloy TMCP engineering technology, abroad already developed a variety of high strenth to solder structural steel. Relatively typical steel plants have: (Development of iron of 1) new day produces succumb the steel of intensity 420MPa (accord with API 2WGr.

60) , ply 40 ～ 70mm, akv of the heat treatment after solder (- 40 ℃ ) 280J, and FATT is achieved - 90 ℃ ～ - 100 ℃ , Akv150J, use at marine platform; Developed what oxide dispersion distributings to succumb again then the marine platform of intensity 500MPa uses steel. (2) plain Qi makes iron and Kobe made steel develop succumb intensity 570MPa steel, solder hot input can amount to 200KJ/cm (plant for traditional steel 4 times) , - use below 20 ℃ , solder not warm-up, crackle of the hole that do not have arc, without sclerotic phenomenon, ply can amount to 75mm, with SM570 photograph comparing has clear advantage, use at bridge construction, and need not besmear outfit. (Iron of 3) new day uses oxidation titanium and nitrogen to change titanium dispersion distributinging technology (abbreviation HTUFF - Super HAZ Toughness Technology With Fine Microstructure Imparted By Fine Particles) develop aseismatic building to use series of steel 490MPa, 520MPa, 590MPa, 100mm of the biggest ply, solder hot input can amount to 1000KJ/cm, local fragile change abate. (4) Finland uses technology of ACC of TMCP ＋ , produce NVE360, NVE400, NVE500, use at icebreaker, , NVE400, NVE500, use at icebreaker, the Ceq of NVE500 is only 0.

40% . From above example can discover, the low cost that what the development of contemporary rolling technology brings is steely enterprise (alloy adds a capacity little) , mainer is to be the downstream user of steely production to provide more immediate benefit. Steel of influence of sensitivity of 1 low crackle is planted solder the element of crackle sensitivity comes from temper by dipping in water strong organization, diffusible hydrogen, cabined degree, sensitive index Pcm decided carbolic equivalent Ceq and crackle strong trend of temper by dipping in water. And microalloy changes technology and control rolling technology apply, the composition design that makes steel is planted is simple, alloy gross decreases, especially of carbolic content reduce (exceed low carbon) , high temperature and in scale of lukewarm change organization rises, the influence of photograph of together with separate out, form nucleus increases, grain is refined. Form acicular the organization that ferrite and body of family name of low carbon shellfish give priority to, because this achieves high intensity and tenacity. The brief melt into of composition raises what steel plants to fought cold cracking sex to offer assure. Tenacity of area of influence of 2 high fever solders the tenacity of hot influence area is new-style microalloy the mainest problem of steel, this problem is to be being accompanied efficient solder technology and come. Solder to rise efficiency, bury arc electric welding of automatic solder, gas (mouth of monofilament, much silk, frit) , electroslag welding (KES, SES) wide application, the increases tenacity of area of hot to soldering influence loss of energy of the wiring that follow solder is more and more apparent. Solder investigator and steel are planted the architect must be searched can prevent HAZ grain effectively thick the technology that change. Worker of each country metallurgy passes old research, discovered nitrogen changes the significant action of titanium above all, put into effect, obtained favorable result. The researcher that what make a person be interested more is Japan discovers oxidation titanium changes titanium to have stronger high temperature stability than nitrogen, plunge into crystal boundary to the hammer, prevent grain to be brought up more effective (namely HTUFF technology) , make steel is planted energy of susceptive solder wiring rises greatly. Solder the problem our country that research faces applies a respect to start in the rolling technology such as TMCP later, the productivity of domestic rolling mill and technical level are at present far lag behind at the country such as Japan, as its application solders indispensably the technology lacks research likewise, development history of abroad and experience are worth to draw lessons from. The job that him union pursues is brief narrate the following idea. 1 solder of intensity of material steel class and tenacity rise above all what urgent need solves is to solder the problem of form a complete set of material, these form a complete set solder material includes welding wire (core of sincere, medicine) , welding flux, welding rod and special solder material, especially efficient solder material. Because this is following,breed will make the research henceforth and development focal point. (1) development agrees with spread cables energy solders used welding wire (especially medical core welding wire) , satisfy gas electricity vertical position welding and electroslag welding; (2) fights those who crack the tendency to reduce as a result of armor plate, crackle move comes welding line metal, development fights crackle sex to solder goodly material is crucial; (Gas of sincere of 3) high strenth protects welding wire, the demand is low splatter, high-powered; (Much silk of 4) and high speed buries the agglomeration welding flux that automatic solder photograph matchs arc; (5) is special enlist in army the welding wire that function asks, ask respectively anti-corrosive, fireproof, aseismatic; (The frit mouth electrode with special 6) ; Mainer is home can form breed relatively all ready (include sincere welding wire, medical core welding wire, welding flux, welding rod) , quality solders steadily material produces a business. 2 solder standard 1) solder material solders data standard was mirrorred on certain level solder state of technology. Our country shows some solder talent levels, with sincere gas protection welding wire, medical core welding wire is exemple, have " gas protects solder to use welding wire of carbolic steel, low-alloy steel " (GB/T8110) , " carbolic steel uses medical core welding wire " (GB/T 10045) and " low-alloy steel uses medical core welding wire " (GB/T17493) ; And Japan is right solder the classification of data standard is more appropriate at the user choose, have " carbolic steel and MAG of excel in steel solder with solid core welding wire " (JISZ3312) , " be able to bear or endure Hou Gang protects welding wire of solder solid core with CO2 gas " (JIS Z3315) , " molybdenum and MAG of chromic molybdenum steel solder use solid core welding wire " (JIS Z3317) , " microtherm, add up to 8, japan is to solder at present the country with data the most all ready standard. 2) solder rules is current our country solders regulations basically differentiates with the industry, like JB/T4709 " steeliness pressure vessel solders regulations " , GB50094 " construction of globose storage tank and check and accept a standard " etc. And Japan, Germany all makes only corresponding steel plant by WES and SEW (or steel class) solder regulations, like WES3001 " excel in steel solders " , SEW088 " but of steel of structure of solder fine grain solder regulations " , german Institute of Welding still recommends those who be aimed at each steel class to solder material chooses a proposal, this is very convenient to manufacturing industry user. The extends microalloy steel advantage of 3 new technology is clear, settled cold crack and hot influence region fragile turn an issue, because spread cables energy solders,the cooling rate after bringing about solder controls the cooling rate during refrigeration under make friends, appear in HAZ consequently bate, compare with traditional alloy aggrandizement photograph, bate becomes new issue. Because of this solders reasonably technology measure remains the research content of welder author, the control that includes solder wiring energy, solder of data strength and mother capable person match etc. As solder technical progress, efficient much silk buries arc solder of protection of many automatic solder, gas, Leng Si solder, narrow clearance solder becomes most practical soldering means, its are main the purpose depends on improving efficiency already, can control again solder the high temperature retention period of hot influence area, accelerate cooling rate. Of precision production concept put forward, solder new-styly means is being accepted for industrial group, among them laser beam welding receives a technology development is most rapid, apply large-scaly at automobile manufacturing industry above all, especially laser spells solder board (Tailor Blank Welding) roll out, make laser beam welding is received be able to popularize. Home already began to begin laser answer to add up to arc welding to apply Yu Hou board recently (basically be marine armor plate) research, this offers the application that is microalloy steel new approach. The development that microalloy changes a technology to be high strenth steel at controlling the application that accuses cold technology offerred sufficient condition, raised the weldability of rolled steel, reduced the sensitivity of cold crack especially, simplified to solder on certain level craft, reduced solder the production cost of treatment. At the same time microalloy is changed also rose to solder the integral performance of hot influence area, solder wiring energy is able to rise, can come true efficient solder. But still a lot of problems are waited for urgently solve, especially efficient, high-powered solder material. CNC Milling CNC Machining