Steel production and installation of anti-corrosion fire prevention knowledge

Structure of the production process flow


(1) the mechanical index: steel structure indexes including the yield point, tensile strength, elongation, impact toughness.These indicators should be consistent with the "code for design of steel structure" requirement, but the low temperature impact toughness of structure may be in only in low temperature environment to test work.The mechanical indexes determination shall be in accordance with the "steel mechanical and technical performance test sampling rules" (GB2975-82)


(2): steel steel composition and processability, toughness, durability and other relevant.Which is the main content of carbon, alloy element content and sulfur, phosphorus and other trace elements content restrictions shall meet the specification requirements (GB222-84).


(3): process performance process performance include solderability and processing properties.Weldability and carbon content and carbon equivalent (low alloy steel), available solderability test identification.Processing performance through cold bending test to determine.According to (GB232-88) as the standard.


(4): deviation of the geometric size of steel (steel, steel, round steel, steel) dimensions and theoretical size deviation must be within the allowable range.Allowable deviation value may refer to national standard GB709-88, GB706-88, GB787-88, GB978-88, GB707-88, GB816-87 etc..


(5) steel shape blemish: steel surface shall be bubble, crack, crack, wrinkle, scar, mixed and pressed into the iron oxide.These defects must be removed, after the removal of the dent depth shall not be greater than the thickness of steel negative deviation.In addition, when the steel surface rust, pitting or scratches and other defects, its depth shall not be greater than the thickness of the steel negative deviation of 1/2 value.


(6) mechanical cutting: the use of mechanical force (shear, sawing, cutting, grinding) corresponding mechanical cutting plate machine, sawing machine, grinding wheel machine, is suitable for thickness of 12 ~ 16mm plate or profile of the linear cutting.


(7) cutting: the use of oxygen - acetylene, propane, liquefied petroleum gas flame heating to melt the metal, which uses compressed air to blow away erosion of metal liquid, so that the metal cut off, suitable for curve cutting and cutting.)


(8) plasma cutting: using plasma arc cutting flow, applied to stainless steel and other materials with high melting point cutting.


(9) hot forming processing: refers to the steel is heated to a certain temperature after further processing.This method is suitable for forming, bending and correction in room temperature can not do the workpiece.Thermal processing end temperature shall not be lower than 700 ℃.Heating temperature 200 ～ 300 ℃ steel have a blue brittleness, prohibited the hammering and bending.Carbon content beyond the low carbon steel's steel not general thermal processing.


(10): cold forming processing is performed at room temperature.Due to external force exceeds the yield strength of the material and the material to produce the required permanent deformation, or due to external force exceeds the ultimate strength of the material and portions of the materials according to the requirements and materials from the.Cold processing of all the materials hard and brittle tendency, which can make the steel through heat treatment in normal state or gouging out more serious edge portion of hardening.The ambient temperature is lower than -16 ℃ not cold working steel.Is lower than -12 ℃, and shall not process of low alloy steel.


(11) bending processing: according to the design requirements, the use of processing equipment and tooling plate or steel bent into a certain shape of the process.Cold bending for sheet, small steel; hot bending for thick plate and complex components, steel, hot bending temperature at 950 ～ 1100 ℃.


(12) coil processing: under the action of external force so that the flat plate of the outer fiber elongation, the inner layer of fiber shortening and deformation method.Coil coiling machine is completed by.According to the materials of different temperature, is divided into cold rolled and hot rolled.Coil for welding tube column, pipeline, air bag.


(13): the steel structure components of the hem edge bending at a certain angle or certain shape process called folding.Hems are generally used for thin plate.Edge folding machine used, with appropriate mould.


(14) molded: molded in pressure equipment using molds to make the steel molding method.Specific practice of blanking and forming, cutting, bending, roll round, drawing, rolling and other.


(15): shovel shovel edge edge is through to the shovel head hammer action and eradication of metal edge spare part and forming groove.Shovel edge there are manual and pneumatic parts, pneumatic tool with.Shovel edge precision is low, generally used for less demanding, a small groove processing.(


16) planing edge: edge planing workpiece is pressed, along the edge planer processing for reciprocating motion, planed groove.Edge planing planing straight edge or edges.(17): milling milling and planing edge similar, just the edge planer tool box tool and cutter of disk milling cutter for milling cutter in which replaced, along the edge of a straight line and also to make the rotary motion, the processing efficiency is high.


(18) carbon arc air gouging: carbon as electrode, and the planing metal arc heating a metal to a molten state, and then use compressed air to blow off of melted metal.High efficiency.


(19) the ground sampling method: in the assembly platform placed according to 1:1 component samples, then according to the position of the parts in the samples, were assembled into components.