Notes

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steel pipe fitting
Introduce some basic knowledge of steel pipe fitting
Pipe Fittings knowledge A pipeline system: You must use the elbow bend the pipe,Guest Posting the pipe size to utilize adjustable head, forked: to transport liquid or gas, you need to use a variety of channels, besides straight pipes with steel pipes, but also use all types of pipe fittings use a tee, utilize the pipe flange joints and fittings are connected, in order to achieve the objective of open transmission medium, but also with a number of valves, to reduce the impact of thermal expansion or shrinkage of the piping system vibration frequency, but additionally with the expansion Section. Furthermore, in the pipeline, as well as with a number of instruments connected to various joints Q plug and so on. We was previously in the pipeline system along with other accessories besides straight pipes collectively referred to as pipe fittings.Second metallic materials common sense: Metal materials are on our daily lives and probably the most trusted industrial materials. It really is mainly split into steel, iron and non-ferrous metals and other categories, and one of the most widely used steel may be the most typical material, steel is the main ingredient is iron, and the rest is artificially added various alloying elements and impurities. For the reason that of the different varieties added alloying elements. Another number before the formation of a variety of steel, such as for example ordinary carbon steel, stainless, alloy steel, etc. In these added elements, the carbon C plays an essential role . 2.1 common chemical aspect in steel: Various steels majority percentage of iron (Fe), other than the, typically contain many of the next elements (commonly known as the alloying elements in steel):C (carbon) Si (silicon) Mn (manganese) P (phosphorus) S (sulfur) andCr (chromium) Ni (Nickel) Mo (molybdenum) Ti (titanium) V (vanadium) etc.Generally, where P, S can be an impurity component, the low the better the grade of steel.

2.2 Classification of Steel: Steel added based on the different varieties of alloying elements, we can simply be split into three categories of steel: carbon steel, alloy steel, stainless.


1. Carbon steel: an alloy element has only C, Si, Mn, P, S five kinds, which according to P, S impurity content level, is divided into carbon steel (P, S general ?0.040%), and quality carbon steel (P, S general ?0.03%), common steel grades are: Carbon steel: Q215A Q235BF Quality carbon steel: 20 # 45 # 16Mn etc.This steel strength and toughness in general, impatience corrosion, may be used in less demanding situations, the cheapest cost.

2. Steel: Along with five forms of elements within steel, also added Cr 10% or less of Mo V along with other elements, common steel grades: 15CrMo 12Cr1MoV 1Cr5Mo like.Weighed against carbon steel, alloy steel, higher strength, heat resistance is also improved, but continues to be poor corrosion resistance, therefore, steel corrosion isn't typically used for high temperature and pressure applications, such as for example boiler steel, thermal power plant steam delivery etc., the cost at a medium level

3. Stainless steel: carbon steel is usually based on the increase in the proportion of high Cr, Ni alloy is manufactured, the content ratio as high as 20%. Common steel grades: 304, 304L, 321, 316,316L, 1Cr18Ni9Ti, steel front for several numerical Japan, america steel representation, the last one (1Cr18Ni9Ti) for domestic steel representation. The following numeric notation steel to illustrate the partnership between several stainless steel components: As a general understanding, but also possible for beginners to remember, we cannot think so (but not quite accurate to state): 304 ...- basic steel species containing only (C <0.08%), Cr (~ 18%), Ni (~ 9%) 304 (C <0.05%) 304L ..- C is called ultra-low carbon 304L 321 ...- 304 + Ti (~ 0.5%) 316 ...- 304 + Mo (~ 2.5%) Ultra-low carbon 316L ..- C of 316 (C <0.05%) called 316LStrength stainless steel, various steel toughness index is the better, the most outstanding advantage is anti-corrosion, chemical and paper corrosive occasions it's important to use stainless steel, of course, the cost is the highest.

Performance 2.3 Steel, said: A steel performance is good or bad, always utilize some indicators to reflect, to represent. For steel, we usually utilize the chemical composition which contains numerical mechanical properties to reflect its quality and performance. Mechanical properties usually have three indicators: Tensile strength (?b, TS): the material can withstand accomplish the best external tension.Yield strength (?s, YS): plastically deformed material can withstand the very least external tension. Elongation (?, EL): fractured material, extending in the longitudinal direction of the percentage, the greater the value, the higher the described plastic-type material. Sometimes, with hardness values, impact toughness values

reflect the performance of other materials.Our most typical carbon steel 20 #, Q235 and abroad SS400, SS41, St37, etc., their performance is quite close, or whatever can substitute for one another, their relevant parameters the following:C: 0.18-0.21% Si: 0.30% Mn: 0.5% P, S 0.025%TS: ~ 550Mpa YS: ~ 260Mpa EL: ~ 25%

2.4 Steel organization and change:Why the difference in the performance of steel, actually, the internal organizational structure of steel related. It might be seen by way of a microscope, the inside steel comprises a variety of cells in exactly the same small tranches as stacked together, and carefully observed, these small tranches actually participate in several different categories, we usually use the same sort of small tranches referred to as a "phase" or of a "body." As we usually say austenitic, ferritic steels refers to the two most common organizational structure, that is two phases. A steel which contains phase, just how much each phase proportion occupied, how phase morphology, that have a primary impact properties of the steel. That's, if the type of steel in phases, proportion, shape changes, the performance of the steel necessary to follow the changes. Then, what factors will lead these years changes? Obviously, changes in composition of the steel change will certainly affect the performance of the steel, and fixed for a particular kind of ingredients steels, such as 20 # steel, or 304L, if they are performed deformation processing, heat treatment, and its performance It will change. To sum up, the primary factors affecting the properties of steel are: composition, deformation and temperature.

2.5 steel heat treatment: To make some kind of steel to achieve the best performance we want, we must be sure internal organizational structure and stability of the structure of a well balanced state. In many cases, we have to be subjected to heat treatment of steel. Because quite steel sheets phoenix are processed from the deformation, deformation of steel by the above-mentioned, it is necessary to change the organizational structure, that's, the performance of steel on the change, and this change is often what we I really do not want to, then we must take measures to remove heat treatment of these changes, restore the original characteristics of the steel. Needless to say, because we've other considerations other heat treatment methods.

2.6 steel representation:World steel representation as endless, but most represented by two methods: a class of its content alloy containing elements to represent a class to the value and strength of steel symbol to represent. E.g:20 # quality carbon steel carbon content represents about 0.20 per cent45 # quality carbon steel carbon content of about 0.45% of1Cr18Ni9Ti- represents the carbon content: 0.1% About Cr18% About Ni 9% Ti: containing little0Cr18Ni9- indicates a very low carbon content, ?0.08% About 18% Cr About Ni 9%Q235 ..- represents the yield strength> 235MPA of carbon Steel

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