Stainless steel pipes 304 pipe

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In metallurgy, stainless steel, also known as inox steel or inox from French "inoxydable", is a steelalloy with a minimum of 10.5% chromium content by mass.

Stainless steel does not readily corrode, rust or stain with water as ordinary steel does. However, it is not fully stain-proof in low-oxygen, high-salinity, or poor air-circulation environments There are different grades and surface finishes of stainless steel to suit the environment the alloy must endure. Stainless steel is used where both the properties of steel and corrosion resistance are required.

Stainless steel differs from carbon steel by the amount of chromium present. Unprotected carbon steel rusts readily when exposed to air and moisture. This iron oxide film (the rust) is active and accelerates corrosion by forming more iron oxide; and, because of the greater volume of the iron oxide, this tends to flake and fall away. Stainless steels contain sufficient chromium to form a passive film of chromium oxide, which prevents further surface corrosion by blocking oxygen diffusion to the steel surface and blocks corrosion from spreading into the metal's internal structure, and, due to the similar size of the steel and oxide ions, they bond very strongly and remain attached to the surface

High oxidation resistance in air at ambient temperature is normally achieved with additions of a minimum of 13% (by weight) chromium, and up to 26% is used for harsh environmentsThe chromium forms a passivation layer of chromium(III) oxide (Cr2O3) when exposed to oxygen. The layer is too thin to be visible, and the metal remains lustrous and smooth. The layer is impervious to water and air, protecting the metal beneath, and this layer quickly reforms when the surface is scratched. This phenomenon is called passivation and is seen in other metals, such as aluminium and titanium. Corrosion resistance can be adversely affected if the component is used in a non-oxygenated environment, a typical example being underwater keel bolts buried in timber.

When stainless steel parts such as nuts and bolts are forced together, the oxide layer can be scraped off, allowing the parts to weld together. When forcibly disassembled, the welded material may be torn and pitted, an effect known as galling. This destructive galling can be avoided by the use of dissimilar materials for the parts forced together, for example bronze and stainless steel, or even different types of stainless steels (martensitic against austenitic). However, two different alloys electrically connected in a humid environment may act as Voltaic pile and corrode faster. Nitronic alloys made by selective alloying with manganese and nitrogen may have a reduced tendency to gall. Additionally, threaded joints may be lubricated to prevent galling.

Stainless steel is generally highly resistant to attack from acids, but this quality depends on the kind and concentration of the acid, the surrounding temperature, and the type of steel. Type 904 is resistant to sulfuric acid at room temperature, even in high concentrations, type 316 and 317 are resistant below 10% and 304 should not be used at any concentration. All types of stainless steel resist attack from phosphoric acid, 316 and 317 more so than 304; and Types 304L and 430 have been successfully used with nitric acid. Hydrochloric acid will damage any kind of stainless steel, and should be avoided.

The 300 series of stainless steel grades is unaffected by any of the weak bases such as ammonium hydroxide, even in high concentrations and at high temperatures. The same grades of stainless exposed to stronger bases such as sodium hydroxide at high concentrations and high temperatures will likely experience some etching and cracking, especially with solutions containing chlorides.

Types 316 and 317 are both useful for storing and handling acetic acid, especially in solutions where it is combined with formic acid and when aeration is not present (oxygen helps protect stainless steel under such conditions), though 317 provides the greatest level of resistance to corrosion. Type 304 is also commonly used with formic acid though it will tend to discolor the solution. All grades resist damage from aldehydes and amines, though in the latter case grade 316 is preferable to 304; cellulose acetate will damage 304 unless the temperature is kept low. Fats and fatty acids only affect grade 304 at temperatures above 150 °C (302 °F), and grade 316 above 260 °C (500 °F), while 317 is unaffected at all temperatures. Type 316L is required for processing of urea

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Q:What's the difference between stainless steel decorative pipes and polished stainless steel pipes?
Stainless steel decorative tubes are mainly used for decoration, such as railings, staircases, hand guards, railings, windows and so on, the wall thickness is very thin,Polished stainless steel pipe is not the same, the industry can also be used, that is, just made out, some rough, not smooth, so polished under the smooth, according to customer needs.
Q:Stainless steel pipes can not be less than the amount of chromium
304 stainless steel tube as 304 steel pipe, in the dry clean atmosphere, have absolutely excellent anti-corrosion ability, but it will be moved to the beach area, with large amounts of sea salt fog, will rust quickly; and the good performance of 316 steel pipe. Therefore, it is not any kind of stainless steel, capable of corrosion and rust in any environment. Stainless steel is a very thin layer formed on the surface and the stability of the fine solid chromium rich oxide film (protective film), to prevent the infiltration of oxygen atoms, to oxidation, and the ability to obtain anti-corrosion. Once there are some reasons, this film was constantly destroyed, air or liquid oxygen atoms will continue to infiltrate or metal atoms of iron to keep out from the loose formation of iron oxide, the metal surface will be continuously corroded. Many of the surface damage form, more common in daily life are as follows: 1. stainless steel surface deposited dust or heterogeneous metal particles containing other metal elements of the attachment, in the humid air, condensed water and adhesion between the stainless steel, the two together into a micro battery, cause the electrochemical reaction, the film has been destroyed, called electrochemical corrosion. 2. stainless steel surface adhesion of organic juice (such as vegetables, soup, sputum), oxygen in the water under the circumstances, a long time, organic acid, organic acid on the surface of metal corrosion. 3., stainless steel surface adhesion contains acid, alkali and salt substances (such as decoration wall caustic soda, lime water splash), causing local corrosion. 4., in polluted air (such as containing large amounts of sulfide, carbon dioxide and nitrogen oxides in the atmosphere), in case of condensation water, the formation of sulfuric acid, nitric acid, acetic acid liquid point, causing chemical corrosion.
Q:Why does the 304 stainless steel pipe leak?
The corrosion resistance of stainless steel is due to the formation of a very thin, adhesive and semi transparent chromium oxide film on the surface of stainless steel. Once this layer of film is destroyed, the chromium in the steel react with oxygen in the atmosphere to recover the film quickly, and mechanical damage can quickly produce a protective film. However, if the chemical erosion by ions, especially chloride ions, will quickly dissolve and corrosion, the result is that the metal surface needle or point, there is a certain depth of small holes, this corrosion is called pitting.
Q:Difference between stainless steel and steel pipe
2. welded steel pipe for different welding process and divided into the furnace pipe welding (ERW) pipe and automatic arc welding, because of the different forms of welding seam welded pipe and spiral welded pipe is divided into two kinds, end its shape is divided into circular welded and shaped (square, flat) pipe.The welded pipe is rolled into the steel tubular to sew or spiral seam welded in the manufacturing method, and is divided into low pressure fluid delivery with welded steel pipe, spiral welded steel pipe, welded steel pipe, welded pipe roll etc.. Seamless steel pipe can be used in various industries, such as liquid, pneumatic, pipeline and gas pipeline. Welding pipes can be used in water pipelines, gas pipelines, heating pipes, electrical appliances, pipelines and so on.
Q:How much more expensive is 304 stainless steel than 201?
201 in the stainless steel industry, represents a kind of material, 201 stainless steel is generally refers to 201 stainless steel and acid resistant steel floorboard. 201 stainless steel refers to the atmosphere, steam, water and other weak medium corrosion of steel, while acid resistant steel refers to acid, alkali, salt and other chemical corrosive medium corrosion of steel.
Q:Stainless steel pipe specification 25*2 what does it mean?
Outside diameter 25MM, wall thickness 2MM, this tube is too thick, our company has thin wall stainless steel tube
Q:Stainless steel and stainless steel pipe inside and outside polishing off, what is the difference?
Deoiling stainless steel tube pipe means no oil after surface cleaning, degreasing bath immersion of the surface to see see oil is not removed, belonging to clean level products, mainly used in pharmaceutical equipment, water equipment, semiconductor and LCD needed for the production of the gas pipeline.
Q:What's the difference between stainless steel 304 and stainless steel 202?
202 stainless steel is one of the 200 series stainless steel, the national standard model is 1Cr18Mn8Ni5N. 200 series stainless steel is low nickel, high manganese stainless steel, nickel content, manganese content of about 8%, is a nickel type stainless steel.
Q:What's the difference between stainless steel 302 or 304?
[difference] 302 stainless steel and 304 stainless steel 304 stainless steel is one of the most widely used kind of chromium - nickel stainless steel, as a widely used steel, corrosion resistance, good heat resistance, low temperature strength and mechanical properties; punching, bending and other thermal processing, non hardening heat treatment (using temperature -196 to 800 DEG C). 302 stainless steel the carbon is relatively high (302 C = 0.15%; 304 C is less than or equal to 0.08%) and better strength. The other indicators are basically the same as those of 304.
Q:Stainless steel welded pipe or seamless pipe expensive?
Another important factor is the type of steel, specifications, such as thin plate than the middle plate expensive, thin-walled tube than thick walled pipe expensive, seamless pipe than welded pipe expensive, and so on.

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