The wide application respect of stainless steel (below)

2. stainless steel on marine equipment apply
All sorts of different the stainless steel of the type is being used increasingly extensively in all sorts of different ocean environment with successful ground. Indispensible point out, in seawater stainless steel should grow hour to avoid at corroding demand mixed and disorderly anticorrosive project technology is mixed a lot of contributive. Austenite and martensite stainless steel for ages since use Yu Fan of great capacity the superheater conduit on power plant and turbine machine lamina. Low chloride content should holding to in these equipment is very of not simple, because of sail sea of power plant apply technology and generate electricity normally the fundamental of equipment is not had different. The container of high capacity chemistry that stainless steel also is using on ocean merchantman, its manage state in some way and terrestrial chemical plant use a condition completely different.
Brand of most stainless steel applies the positive result that can get satisfaction below marine condition, but different brand corrodes craze to reflect delicacy to stress. With 410 model the martensite steel that is a delegate and 430 model the ferrite steel that is a delegate, below marine condition, can rust inside a few months. This kind even and rustily can try through mechanical burnish take out. The stainless steel with welcome contrast is austenite stainless steel, fight rustily ability because of it stronger (but because stress corrodes craze,break rules) . Always remove accordingly, austenite stainless steel also is met nigrescent. If because beautiful or the element of other respect, this kind nigrescent also can pass burnish take out. Stainless steel can produce even rust watt rarely in seawater, be in so in be being applied actually but need not anxious.
The propeller on the tug on propeller ocean and other shipping but by forging stainless steel CF - 8 (work appropriately 304 model stainless steel) make. Do not sail when shipping when, arrive through bearing from propeller main shaft hull, make an electric metallic return circuit. It is at composition appropriately 410 model of stainless steel forging propeller often also wraps around choose, get be applyinged extensively is like be usinged at icebreaker to wait in other respect.
Of technology of latter-day stainless steel begin, germinant already choose answer photograph austenite - 20Cr of ferrite stainless steel - 8Ni - 3.5Mo will forging on ocean a large ship large propeller (heft 3000kg) .
The shipping that often works in haven, the log that encounters offing simply all the more to go up or other floating body and the attaint that accelerates propeller. Consequently, choose austenite stainless steel to make propeller can get through Jiao Zhi or soldering method correction, this is a doubt that is worth to pay attention to.
Below the condition that pump observes centrifugal pump works in seawater already, if choose stainless steel member, can show sure dependability. In the seawater that holds to flow, choose CF—8M to forging stainless steel impeller (its composition is proper at 316 model stainless steel) and with 316 model stainless steel makes main shaft, can not give any question. When water pump suspends operation, crevice corrosion and spot corrosion very perhaps become austere question. But if will use relatively lively and what become rusty easily is cast-iron make a wall thick proper when big pump case, cast-iron in stop machine hour to be able to remove cathode to safeguard the effect. When pump works, the cathode of cast-iron box safeguards the effect to fall to will surely make issue rubiginous steel polarization surely, but water dimension of flow waited for cathode to safeguard the effect. In addition, grow the pump that always works to because replace,perhaps be applied, seawater replaces fresh water and rise to defend sometimes already the effect.
Bulk container stainless steel is used to all along come loose mediumly as freight bag of container, carrier fluid of outfit of in order to changes natural gas system (LNG) , chemical, beverage. The container bad habit that LNG fills in freight chooses 304L stainless steel, its intent is not for anti-corrosive the mechanical function that thinks to fall in microtherm state however.
About the container of marine and chemical finished product, if the intent head that chooses stainless steel ponders over its corrosion resistance, of this and terrestrial and chemical finished product store carry is different. If shipping is attributed to normally nonsked steamer, the container of locomotive and chemical finished product also can ship any goods, arrive from oar of acetic acid, flooey xylene. Make pump of valve, freight, canal meet with with 316L stainless steel normally, heat coil and container itself. Container can be formed by all stainless steel or get on with carbolic steel Bao Fu 0. 06 ～ 0.08in (1.5—2.0mm) stainless steel board make. Before apply, be necessary to undertake detailed examination plank whether undertake He Dun changes processing be cleaninged completely handling faultily.
The experiment indicates the guest of chemical finished product implement promise to undertake eroding with seawater, but need subsequently irritated erode very quickly with fresh water. About any stainless steel heating installation inside container, erode completely when chloride unfinished once, do not start produce stress to corrode craze in case. When container of chemical finished product plans, ought not to think because,use Lai Chenghai water so do can guide - incur the risk that produces crevice corrosion. If program program is medium regular blame uses Lai Chenghai water cannot, so be necessary to ponder over those who adopt cathode to safeguard a system to accuse crevice corrosion in order to hold to begin. Below this kind of state, stainless steel container perhaps can happen hard the limy deposit of take out, this is a doubt that is worth to pay attention to.
Heat exchanger coerces the condenser of boiler circulation system and condenser of power station vapour choose conduit of austenite stainless steel extensively already, latter water inlet chooses copper alloy data because of height is polluted and shoulding not be. The good data with welcome contrast is 316 model stainless steel. Be in the coast and harbour area, a lot of ab extra conglomeration and silty enter condenser pipeline, form simply all the more austere and cloggy, this kind of state is necessary to adopt a method to add Esau to divide. A kind of reasonable method is namely in choosing balata ball to pass conduit circularly, because balata ball can happen,kneaded the fruit that hold effect to clear next tube wall. When the rate of going from place to place when seawater is 1m ／ S about, can avoid ocean organic kind sundry by inspiratory, protect terrified next condenser conduit is avoided at producing spot corrosion. Different at other coloured alloy, the conduit that chooses stainless steel to make condenser does not accept the obligation of the largest velocity of flow, but concern with the economic effect of all pump equipment however.
Report of form of series connection of O form sealing ring joins implement choose extensively with equipment of fixed position of sealing ring of concerned O form 304 model and 316 model stainless steel is made, it is ocean and martial project all the more. Choose what afore-mentioned data can get satisfaction to exert the effect. O form sealer can pass the body of a ship, aluminium is worn or other element gets cathode safeguards the effect. If do not have cathode to safeguard the effect, the fine be pickled with grains or in wine of O form sealing ring is very fast (some are inside number week) can produce aperture corrupt to illuminate and cause austere invalidation.

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