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Tuesday, 7 April 2015

Welding Defects With Stainless Tube

Welding Defects With Stainless Tube

Welding Defects With Stainless Tube
Thick walled stainless tube surface treatment process weld defects exsit much more serious problems, the application of hand-processing ways to compensate for mechanical polishing, grinding marks generated, leading to uneven surface and affect appearance.Only the weld surface inconsistencies acid passivation, also ended in uneven surface and affect appearance. Pickling and passivation is difficult to get rid of scratches whole, nor can a variety of scratch generated in the operation,and also the scratch is not removed on account of welding spatter sticking with the top of metal and carbon steel, splash and other impurities, leading to chemical or electrochemical corrosion and rust corrosion occurs under conditions of corrosive media presence.

Weld cracking tubes within two-phase corrosion

Duplex petroleum cracking tubes within the usual two-phase corrosion medium can passivation, so has good corrosion effectiveness against common duplex stainless-steel for instance, it can be resistant against sulfuric acid, hydrochloric acid, formic acid, phosphoric acid, oxalic acid corrosion performance than austenitic type 316 metal, corrosion-resistant nitrate is merely slightly worse, duplex metal in several media corrosion resistance are more than 316 steel. 

Highlight the main advantages of duplex stainless-steel is resistant against stress corrosion cracking, the key reason is:as a result of presence of two-phase microstructure, stress corrosion cracking when passing over the phase boundary frequently blocked, expand difficulties; yield high strength duplex stainless, exactly the same applied pressure Under slip deformation hardly occurs, the crack is hard in order to create; ferrite phase to austenite could be the anode to the austenite phase may play a cathodic protection. Even in a multi-sulfuric acid and high temperature water, duplex stainless also has a strong resistance to stress corrosion cracking capacity.

The engine room houses machines like steam boilers used for producing steam for heating fuel oil, accommodation, and cargoes, where fuel is burnt inside in a furnace in controlled combustion. Incinerator wastes like oily rags, sludge, as well as other operational wastes are burnt with a temperature of 850 degrees C and above.

Thus each one of these varieties of machines making use of their devices and piping may cause a hearth hazard or even properly maintained, or if there's an automation failure, fatigue of cloth, or vibration failure. A fire inside the engine room, unless restricted within the beginning often fades of control, causing many times the loss of the ship and life. Thus it is imperative that the machineries and the fire detection and firefighting systems are maintained in efficient condition.

Compared to its predecessor, the T22 or P22 grade, grade 91 exhibits high strength around temperatures inside the array of 600C.Also the oxidation temperature limits are higher. This allows the energy plant designers to engineer components,superheater coils,headers and steam piping, with less thickness. This plays a part in a higher thermal fatigue life of almost 10 times.This allows the crooks to boost the operating temperature to a better level, helping the efficiency of the energy plant.

It can also be used to clean surfaces before welding.In fact, isopropyl alcohol is used to clean various surfaces because it effectively removes oil and grease on surfaces.It is accustomed to clean surfaces of electronic equipment,LCD screens of televisions and computers,and also other materials and instruments. 

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