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8mm id brass tube

author:MF manufacturerstime:2022-03-13 12:14:06

Steel tube standard terminology and definition

1 Material material

1.1 Steel number steel grade Steel grade。

1.2 Steel grade pipe grade Name indicating the level of steel pipe strength。

(8mm id brass tube)2.Mechanical behavior mechanical strength

(8mm id brass tube)2.1 tensile strength tensile strength Metal material to resist the maximum capabilities of damage under tensile action,symbolRm,Unit isMPa。

2.2 Yield point yield strength Metal material begins to produce the lowest stress point when yield,symbolReL,Unit isMPa。

(8mm id brass tube)2.3 Impact performance impact property Metal material on external impact load resistance,Commonly usedVType gap impact,symbolAKV,Unit isJ。

2.4 Elongation elongation Tensile test,The length of the length and the principle of the principle of the protracitomode length after the sample is broken.,symbolA。

2.5 hardness hardness Metal material resists hard objects。

2.6 Rockwell hardness Rockwell hardness Press the surface of the steel with a diamond cone head,Detecting a hardness value by measuring indentation depth residual increment。Steel tube commonly usedCRuler andBRuler's hardness,which isHRCandHRB。

2.7 Brinell hardness Brinell hardness Press a diameter steel ball into the surface of the sample,Detecting a hardness value by measuring the surface of the sample surface hindrance diameter,SymbolicHBWExpress。

2.8 Vickers hardness Vickers hardness Press the surface of the sample with a positive quadrush,Detection method for obtaining hardness values by measuring the length of the sample surface of the sample to obtain a hardness value,SymbolicHVExpress,More used in gold phase inspection。

2.9 Water pressure test hydrostatic test A test method for measuring the transmissitude of steel pipe。Under test pressure,Regulating time is not less than5 s,Test pressure calculation formula is:P = 2SR/D In: P — test pressure,MPA(MPa),whenP <7 MPaTime,Trimsy approximate0.5MPa,whenP ≥7 MPaTime,Trimsy approximate1MPa;S — Steel tube thickness,Unit is mm(mm);D — Steel tube Nominal outer diameter or calculating outer diameter,Unit is mm(mm);R — Allow stress,ASMERegulation,Carbon steel and ferrite alloy steel pipe,The stress produced by the test cannot be less than the smallest value known yield strength.60%,Austenitic alloy steel pipe,Should not be less than the smallest value of the yield strength50%;Allow stress should be calculated according to the corresponding standard。

2.10 Flattening test flatten test Test the deformation performance of the steel tube pressure-flat to the specified size。Test is carried out at room temperature,After flatten test,Samples do not allow cracks and cracks。GB/T8163-2008Regulation,For the outer diameter22mm~400mm,And the wall thickness and outer diameter ratio is not greater than10%of10、20、Q295andQ345Packed steel pipe should be tested,After flatten test,Sample does not allow cracks or cracks。The flattening test of the actual steel pipe material should follow the corresponding standard regulations.。

(8mm id brass tube)2.11 Bending test bend test Mechanical test when the material is subjected to bending load。The bending test is mainly used to test the plasticity and surface quality of the steel pipe.。Generally bent test should be required according to the requirements,Negotiate,And indicate in the contract,For the outer diameter is not greater than22mmSteel pipe can be bent test,Crack or cracks are not allowed after curvature of the sample。The bending test of the actual steel pipe material should follow the corresponding standard regulations.。

2.12 Bulk test drift test It is the deformation performance of the steel pipe end bungery。General expansion tests should be required according to the requirements,Negotiate,And indicate in the contract,For wall thickness8mmSteel pipe can be used as an extension test,Crack or cracks are not allowed after the expansion。The expansion test of the actual steel pipe material should follow the corresponding standard regulations.。

(8mm id brass tube)2.13 High temperature strength high-temperature strength Sample mechanical properties tested at higher than room temperature。Generally there is high temperature and short tensile performance,High temperature hardness, etc.。

2.14 High temperature creep high-temperature creep Metal high temperature for a long time、Constant force(Even if the stress is less than the yield strength at this temperature)Phenomenon in slow plastic deformation under action,SymbolicσTA/ t(MPa)Express。

2.15 Lasting strength rupture life Metal material resists breakage of breaking under high temperature long load,SymbolicσTt(MPa)Express。

3.Management process tube making technology

3.1 perforation pierce Put the solid tube blank with the head into a hollow hair tube。

3.2 Hot rolling hot roll Rolling by means of metal materials at high temperatures。The rolling force required for hot rolling is small,The geometry of the rolling is not accurate enough.。

3.3 Cold pull cold draw A process for cold-processed hair tubes after perforation。Cold extension generally needs multiple pull-out,There must be corresponding depletion annealing between each draw.,Guaranteed the success of the next pull。The hair tube is absorbed before the cold pull(acid washing)、Phosphat(phosphorization)Sapata(saponification)deal with。Soybean is a method of cleaning metal surface,Generally, the perforated g holder is generally immersed in an aqueous solution such as sulfuric acid.,Oxide film in which metal surface is removed;Phosphating is a layer of phosphate protective film to the metal surface by chemical reactions;Saponification is coated with a soaphor in a metal surface,It reacts with the phosphating film to produce a layer of metal soap film,Lubrication in the cold pull process。

3.4 Cold rolling cold roll Rolling by means of metal materials at low temperatures。Before the cold rolling, the hair tube is also needed.、Phosphating and saponification treatment,Cold rolling is large,Rolling finished product geometry is accurate。

3.5 Thermal expansion hot expand Heat the master tube to a plastic deformation temperature,Expand the outer diameter of the mother tube through the mandrel、A process of thin thin thin。

(8mm id brass tube)3.6 Heat treatment heat treatment Place the material into a certain medium heating、Insulation、cool down,A process of controlling material performance by changing the surface or internal tissue structure of the material.。

3.7 Finish dressing Re-processing in order to achieve the size and quality requirements of our customers。

3.8 Straighten straightening Correction of shape defects for metal plastic processing products,Is one of the important finishing processes。

(8mm id brass tube)3.9 Shot shot cleaning Generally, the surface of the steel pipe is treated with compressed air blow pills.,Reach the cleaning surface(Deforestation、glitch、Dirt, etc.),Breaking the surface,A finishing process for improving anti-fatigue properties of steel pipes。

3.10 Flat plain ends Cut the steel tube on both ends of the steel pipe into the axis of the steel pipe90°Plane。

3.11 Slope beveled Processing the steel tube on both end faces into a certain angle of welding slope。

(8mm id brass tube)4.delivery status condition of delivery

4.1 Rolling state as-rolled Delivery state without any special rolling or heat treatment。

4.2 Normal fire normalizing Heat steel to the phase change point30℃~50℃,Insulation for a certain time,Cooling in still air,Get a heat treatment process containing uniform tissue of pearlite。

4.3 annealing annealing Heat steel to a certain temperature,Insulation for a certain time,Then slow cool to obtain a heat treatment process close to the balanced state tissue structure。

(8mm id brass tube)4.4 Completely annealed full annealing Complete the steel,Slow cool,Get annealing process close to balanced state organization。

(8mm id brass tube)4.5 Isothermal annealing isothermal annealing Heat steel to the phase change point temperature,After the insulation is appropriate,Something of the pearlite transition temperature range is superficial to maintain the austenite to pearlite tissue,Thenever the annealing process is cooled in the air。

(8mm id brass tube)4.6 Debut annealing relief annealing In order to remove due to plastic deformation、Welding or the like to cause residual stress in the steel pipe。

4.4 Quench quenching Heating steel to a certain temperature above the phase change point,Insulation for a certain time,Then get cold to get the heat treatment process of martensite tissue。

4.5 Temper tempering Steel parts,Heat it againAc1Some temperature below,Insulation for a certain time,Then cool to the heat treatment process of room temperature。

4.6 Tuning hardening and tempering Quench+High temperature tempering heat treatment process。

4.7 Solid solution treatment solution treatment Mainly for austenitic stainless steel and high temperature alloy,Heat alloy to high temperature single phase area,Thermal treatment process for quick cooling after a certain time。

5.Geometric size size

5.1 Nominal size nominal dimension Name size specified in standard,Is the ideal size that users and manufacturers want to get,Also ordered in the contract。

5.2 Actual size actual dimension Is the actual size obtained during the production process,This dimension is often greater than or less than the nominal size。

5.3 Outer diameter out diameter Round steel tube diameter,Average outer diameter,SymbolicODExpress。

5.4 the inside diameter of inner out diameter Rounded steel pipe inner diameter,Average inner diameter,SymbolicIDExpress

5.5 Wall thickness wall thickness Distance between the outer circle of the steel pipe and the inner circle,SymbolicWTExpress。

5.6 tolerance tolerance Positive specified in the standard、Negative difference value is absolute and called tolerance,Also known as“Tolerance”。

5.7 Allow deviation permitted variations during production,Due to the actual size is difficult to reach the nominal size requirements,That is, it is often greater than or less than the nominal size,Therefore, there is a difference between the actual size and the nominal size.。The difference between the difference is the positive deviation.,The difference is negative deviation of the negative value.。

(8mm id brass tube)5.8 Usually length random length Non-defined length,Where the length is within the length of the standard, there is no fixed length requirements,General length。

5.9 Fixed length cut lengths The length of the fixed length should be within the usual length range,Is a fixed length size required in the contract。However, it is unlikely to cut the absolute fixed length in actual operation.,Therefore, the permissible positive deviation value is specified on the length of the scale.。

5.10 Multiplier length multiple length The length of the quarantine should be within the usual length range,The contract should be indicated in the contract, and the length of the total length is constituted.(E.g3000mm×3,which is3000mmof3multiple,Total length9000mm)。Actual operation,Positive deviations should be added based on the total length20mm,Plus the slit balance of each halp length。

5.10 Range length range length The range length is within the usual length range,Is the length of a certain fixed range required by the user。

5.11Curvature straightness The steel pipe is curved in the longitudinal direction.,The use of numbers indicates that their curve is called bend.,Also called flat straightness。The standard is specified using the curvature and full length bending per meter.。

6.Non-destructive testing nondestructive examination

6.1 Ultrasonic flaw ultrasonic testing The influence of the acoustic performance of the material and its internal defects on ultrasonic propagation is used to test the non-destructive testing method of internal defects of materials.,SymbolicUTExpress。

6.2 Eddy current eddy current testing Using electromagnetic induction principle,A flaw detection method for detecting steel pipe surface and near surface defect,SymbolicETExpress。

6.3 Leakage detection leakage flux testing Magnetize steel pipe surface,Picking the defective leakage field,Form a defective electrical signal,Non-destructive testing method for discovery defects,SymbolicLTExpress。

6.4 Magnetic particle inspection magnetic particle testing Leakage magnetic flawth,Use in strong magnetic fields,Non-destructive testing method for improving magnetic powder in the surface of the surface of the ferromagnetic material,SymbolicMTExpress。 6.5 Ray flaw radiographic testing Exploration method of inside defects in object by ray penetrating body,SymbolicRTExpress。

6.6 Coloring dye detection Penetration(PT)One test method,Soluble with color dyes(Red dye)The penetrant penetrates into the small cracks of the surface of the workpiece,After cleaning, adhesive,Remove the color oil in the defect to the surface,Method according to color spots and stripes discovery and judgment defect。

7.Common defect defect

(8mm id brass tube)7.1 Inconsistent out-of-roundness The difference between the largest and minimum diameter of the round steel pipe cross section,Also called elliptical。

7.2 Wall thickness wall unevenness Phenomenon that refers to the thickness of the steel pipe different parts of the steel pipe。

7.3 Linear defect linear defect Including but not limited to cracks(crack)、fold(lap)、Indentation(plug score)、Straightway(straight)Inside、Spiral(spiral)Lack。Among them, the crack refers to a slit formed in a metal surface or internally.,Folding refers to the steel pipe、Local area of the outer surface wrinkles a layer of metal skin,Indentation refers to in the steel pipe、There is a straight line trace left by hard objects left.,Straight road refers to the steel pipe、There is a raised or depressed outside surface.、And there is a straight line of a width,Inside、External spiral generally refers to a spiral line in the surface of the steel pipe in the axial direction.。These defects applied to abrasive method completely removed,The wall thickness of the grinding is not allowed to exceed the negative deviation of the nominal wall thickness,And keep the sleek transition。

7.4 Nonlinear defect non-linear defect Including but not limited to pits(pit)、Hinder(scab)、Stratification(lamination)Lack。Among them, the pit is a pit defect formed on the surface of the steel pipe.,Jockery finger、Local area of the outer surface, a small piece of metal,And the layering refers to the defect of the layered structure formed inside the steel pipe.。Pit、Surface defects such as tide can be removed,But the layered defect is in the interior of the metal,Part of this defect must be removed。

(8mm id brass tube)8.Other common terms

8.1 Smelting number heat no Be called a stove number,Refining the tank of steel。

8.2 Smelting analysis heat analysis Reported by the steel mill、Chemical composition analysis for different furnace numbers。

8.3 Finished product analysis product analysis Reported by the steel pipe manufacturer、Analysis of chemical components for finished steel pipes of different furnace numbers。

8.4 Microstructure micro-structure Appropriate method(Erosion)Processing metal sample grinding surface placed under an optical microscope or an electron microscope。

8.5 Grain size grain size Used to indicate the level of grain size inner grain size。Three finer,The higher the grain level level。

8.6 Inspection inspection lot Tortuous、Limited number of steel pipe products produced under the consistent conditions of attribute。

8.7 Theoretical weight theoretical weight According to the weight of the nominal size and density of the steel pipe, it is called the theoretical weight.。

8.8 Actual weight actual weight Refers to the steel pipe with the actual weigh(Overweight)Weight。.

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