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 304 and stainless steel 202?
Different chemical composition. 304 of the nickel is much higher than 202.
Q:How thick is the 3 stainless steel tube?
Refers to the stainless steel tube with a wall thickness of 3 mm.
Q:About stainless steel welding deformation
For welding of grade 304 stainless steel, the current can be adjusted a little, not preheating, to prevent deformation after welding, the welding sequence should pay attention to, such as left -- right -- in the welding line, avoid welding head, to prevent warping.
Q:Disadvantages of stainless steel tubes
Stainless steel pipe is a kind of more durable pipeline material. But its price is higher, and the construction process requirements are relatively high, but its material strength is hard, the field processing is very difficult. Therefore, in the decoration project, the probability of choice is low.
Q:What wire is used for welding of 316 stainless steel line?
Quality inspection of welding groove preparation, according to requirements of groove size, accuracy and surface quality stipulated in construction instruction and welding process instruction, groove quality including flatness, perpendicularity and cleanness.1, check the groove processing size (height, angle, edge and blunt edge, etc.) and accuracy isDoes it meet the relevant technical standards?.2, check the groove surface roughness and surface defects (cutting gap, crack,Layer and slag) if beyond the scope of the standard should be allowed to defect, repair treatment, such as surface roughness does not reach the standard, can use abrasive grinding.3. Check the surface cleaning quality of the groove. At least 200mm of the groove face and its sidesShould be clean within the scope, without burr, slag, rust, oil, film and paint and other harmful foreign bodies.4 、 nondestructive inspection of groove surface. For welding process documentation, specify the slopeMaterials such as CY-M steel, Fe-CY-N, high temperature steel and alloy steel shall be examined on the surface for nondestructive testing (such as coloring, etc.), and the defects such as cracks shall be removed.
Q:Stainless steel pipe welding interface leakage, how can we not leak?
The gap between the group and the WPS should be corresponding, and the gap is too big or too small, which will lead to welding defects;
Q:What's the difference between stainless steel pipe or stainless steel composite pipe?
Stainless steel is also divided into several kinds of 200201300301304,The market is generally 301 material, 304 of the best results, followed by 301.
Q:What brand of stainless steel pipe cutting machine is good?
Stainless steel cutting pipe should take into account the cutting speed, accuracy, cross section flatness, surface scratches, cutting tool loss and so on
Q:Are stainless steel pipelines buried in need of corrosion protection?
The factors of the material itself: stainless steel pipe structure exists because of the equipment, or the existence of cracks of metal or non-metal deposits on the surface, in the sediment and the stainless steel tube surface in the formation of cracks, corrosion, will give priority to produce punctate and ulcer like damage in the crevice, which is crevice corrosion.
Q:Mirror stainless steel tube 60*60 how much is one meter?
Examples are stainless steel 63 round tubes, solid thickness 0.82 stainless steel tubes, single support 6 meters long, weight (63-0.82) *0.82*0.02491*6=7.62kg, a six meter long 63 round tube, thickness 0.82, theoretical weight is 7.62kg;

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