316 stainless steel in nitric acid


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Mechanical Properties

Selection of stainless steels for handling nitric acid (HNO3)

Generally stainless steels are resistant to corrosion in nitric acid over a wide range of concentration and temperature. The 'helpful' oxidising properties of nitric acid are used in the chemical 'passivation' of stainless steels. The isocorrosion diagram 0.1mm/year lines for the 304 and 316 …Member List · Passivation of Stainless Steels · Technical Library · About Stainless Steel · Publication

304, 304L versus 316 in corrosion resistance against

engtips› …› Activities› Corrosion engineering ForumNov 24, 2004· (The nitric acid production process consists of air oxidation of ammonia under pressure to produce nitrogen dioxide which is absorbed in in water to produce 60% nitric acid.) Again, if 316 grade is to be used, a NAG 316L is preferred .Nitric Acid is a specific environment for intergranular attack (IGA) on sensitized austenitic grades. As such the low carbon and stabilized grades are used i.e.,304L ( instead of 304), 321 and 347. A nitric acid grade (NAG) of very low carbon, silicon and phosphorus to improve resistance to IGA is available. Molybdenumbearing grades (316) are usually not employed in the nitric acid producing plant due to the susceptibility of molybdenum to oxidation and the adverse effects of certain intermetallic constituents. (The nitric acid production process consists of air oxidation of ammonia under pressure to produce nitrogen dioxide which is absorbed in in water to produce 60% nitric acid.) Again, if 316 grade is to be used, a NAG 316L is preferred . Surin4for information on improved 304 resistance see this article: mext.go.jp/english/news/2000/09/000961.htm JMW viscoanalyser EngTips: Pro bono publico, by engineers, for engineers. Please see FAQ731376 for tips on how to make the best use of EngTips Fora.Surin is right on target.There are low residual grades of 310S that are also used in acid service (as I recall low C, P, S and B). The Mo does not help you, Cr and Ni do. Corrosion rates is nitric are very temperature sensitive. Higher temps will lead to IGA in materials that look like they have a clean structure. The grain boundaries must be very good for hot acid service. = = = = = = = = = = = = = = = = = = = = Corrosion never sleeps, but it can be managed. trenttube/Trent/tech_form.htmWe have a lot of experince with respect to use and corrosion of s/s 316 in our nitric acid plant.I advise to use s/s 304L and in severe conditions nitric acid grade (with low c,p,s).A look at the following website concerning the use of Zirconium in HNO3 service. Zr has become a very important material for use in HNO3 plants. Our HNO3 plant 1500+ tons/day has a very large ZR HE that replaced a 304L SS. The 304L HE was lasting less than 1 year, the Zr HE has been in service for more than 12 years with no problems. Our spec for 304L requires 0.015C or less with the lowest S and P obtainable with this carbon content. We do allow 304SS flanged valves from certain manufacturers. There is no 316SS of any persuasion in the liquid end of the system. HNO3 in the pure state is transported in 304ELC lines (seamless pipe) and stored in 321SS and 304ELC SS tanks. All the 321SS tanks are skirted while the 304ELC tanks are on grillage bars. All tank seams are double vee with 100% PT overall with 100% RT on the bottom and 50% (progressive) on the walls and roof. We tried several of the high purity alloys (as actual tank sheets) with mixed results and the economics weren't there. Some of the secrets of using 304ELC is the choice and care of the welding electrodes along with a very good welding program. wahchang/wahchang/pages/products/data/zirconium/nitric.htmTo Unclesyd I understand that your temp of NA could be well within limits (say<90~100 Deg C, I do not recall exactly Pl pardon. Can be confirmed with wahchang!), or else you stand danger of pyrophoric reaction when Zr tubes r there for HE!! One has to be careful whne Zr tubes r there. If not so could you pl elaborate yr service parameters. This could be additional info from the basic disc'n of 304/304L /316L. We have NA 60% & 98.5% plants and have 304L as piping MOC and stoarage tanks from 304LN for 60% NA & AL tanks for 98.5% NA. YBG58[b]YBG58[/], I will try to get the exact parameters for the Zr HE the first of the week. The acid plant is a 1500+ ton/day 65% bleached acid for onsite use in a HNO3 oxidation process. It is one of three that were built at about the same time. The two others converted to Zr about 3 years prior to our conversion. You might have heard about the prime mover. The air compressor, high pressure expander, and steam turbine are all on the same shaft in a single housing. It is the only one of the three that still has this configuration.YNG58 , The Zr exchanger is a Low Pressure Weak Acid Cooler. Inlet Temperature is 392°F Outlet temperature is 114°F The shell side is CTW with summertime temperatures approaching 85°F.

316L Stainless Steel Technical Data Sheet metal shims

316L Stainless Steel Technical Data Sheet. Type 316 is considerably more resistant than any of the other chromiumnickel types to solutions of sulfuric acid. At temperature as high as 120° F (49° C), Type 316 is resistant to concentrations of this acid up to 5 percent. At temperatures under 100° F[PDF]

316L Stainless Steel Chemical Compatibility Chart from ISM

Alcohol, Isobutyl A Ammonium Fluoride D Alcohol, Isopropyl B Ammonium Hydroxide A Alcohol, Methyl (methanol, wood alcohol) A Ammonium Metaphosphate A Alcohol, Octyl A Ammonium Monophosphate A Alcohol, Propyl A Ammonium Nitrate A Allkyl Benzene B Ammonium Oxalate A. 316L Stainless Steel Chemical Compatibility.

Selection of Stainless Steel For Handling Nitric Acid HNO3

Selection of stainless steel for handling nitric acid (HNO3) Nitric acid is strongly oxidising and promotes the resistance of stainless steel to corrosion. Generally stainless steel are resistant to corrosion in nitric acid. Nitric acid is used in the chemical passivation of stainless steel.. Commercially concentrated acid is around 65 wt % (sg = 1.40).

Passivate 304 and 316 Stainless Steel or Not? Finishing

Passivate 304 and 316 Stainless Steel or Not? adv. 2002. We are manufacturing SS components from SS 304, 316 . We carry out passivation in a plastic container. Our passivation formulation consists of 20% Nitric acid and 5 % sodium dichromate in water. We immerse our components in this formulation for approx. 45 min, without any heating.

Stainless Steel Chemical Compatibility Chart CP Lab Safety

Stainless Steel Chemical Compatibility Chart: Check the chemical compatibility of Stainless Steel with various chemicals, solvents, alcohols and other products.. Shop Stainless Steel. Please Note: The information in this chart has been supplied by reputable sources and is to be used ONLY as a guide in selecting equipment for appropriate chemical compatibility.[PDF]

The performance of stainless steels in concentrated

stainless steels such as 316 for piping, within a limited temperature and acid concentration range. However, the The performance of stainless steels in concentrated sulphuric acid. NOMINAL COMPOSITION (wt%) published data for 310 stainless steel over this acid concentration range. This is probably because the manufacturers of acid plants

Stainless Steel Chemical Compatibility Chart CP Lab Safety

Stainless Steel Chemical Compatibility Chart: Check the chemical compatibility of Stainless Steel with various chemicals, solvents, alcohols and other products.. Shop Stainless Steel. Please Note: The information in this chart has been supplied by reputable sources and is to be used ONLY as a guide in selecting equipment for appropriate chemical compatibility.

Can I use 316L stainless steel in a nitric acid solution

Here's an isocorrosion chart for nitric acid and 304 or 316 at 0.1 mm/year. So you can store any concentration around room temperature with a pretty low to negligible corrosion rate. So you can store any concentration around room temperature with a pretty low to negligible corrosion rate.

Selection of Stainless Steel For Handling Nitric Acid HNO3

Nitric acid is strongly oxidising and promotes the resistance of stainless steel to corrosion. Generally stainless steel are resistant to corrosion in nitric acid. Nitric acid is used in the chemical passivation of stainless steel. Commercially concentrated acid is around 65 wt % (sg = 1.40).

Grade 316 Stainless Steel Technical Data askzn.co.za

Stainless Steel Grade 316 Grade 316 / 316L Technical Data Summary. Grade 316 is an improved version of CS 304, with the addition of molybdenum and a slightly higher nickel content. The resultant composition of CS 316 gives the steel much increased corrosion …

Effects of nitric acid passivation on the pitting

Samples of 316 stainless steel have been subjected to passivation treatments at ambient temperature for 1 h in solutions of up to 50 wt% nitric acid.

Selection of stainless steel for handling nitric acid

Selection of stainless steel for handling nitric acid (HNO3) Generally stainless steel are resistant to corrosion in nitric acid. Nitric acid is used in the chemical passivation of stainless steel. Commercially concentrated acid is around 65 wt % (sg = 1.40). Higher concentrations obtained by removing water, which can involve the use of sulphuric acid, which has a high affinity for water.

Passivating Stainless Steel with Nitric or Citric Acid

stilldragon.org› Beginner's TalkManufacturers of SS pots, cookware and other stainless steel products use a hot nitric acid bath to passivate the SS. I can get nitric acid but it's nasty stuff and it has to be used in a certain way or it can ruin your stainless, on the other hand citric acid is said to not attack the SS but only remove any iron from the surface and after rinsing and drying the SS is much more corrosion resistant.[PDF]

The performance of stainless steels in concentrated

Alloy 310 is a high chromium, nickel austenitic alloy that has superior acid corrosion resistance compared with 304 and 316. Sulphuric acid is one of the most commonly used chemicals in the world and, at concentrations greater than 90wt%, it is also very corrosive.

Using Acids With Stainless Steel

In July 1996, the laboratory supervisor at a major stainless steel processing facility sustained a severe eye injury when a mixture of 25ml concentrated hydrochloric acid, 25ml concentrated nitric acid and 50ml isopropyl alcohol burst through the top of the storage bottle and splashed into his right eye.

Stainless steel Wikipedia

All types of stainless steel resist attack from phosphoric acid and nitric acid at room temperature. At high concentration and elevated temperature attack will occur and higher alloy stainless steels are …Corrosion resistance·

Effects of nitric acid passivation on the pitting

Samples of 316 stainless steel have been subjected to passivation treatments at ambient temperature for 1 h in solutions of up to 50 wt% nitric acid.

Passivating Stainless Steel with Citric Acid Finishing

Passivating Stainless Steel with Citric Acid. For example: 1. Stainless steel parts have relatively clean surface with no free iron, no areas depleted by chrome, no signs of rust; 2. SS parts have iron on it surface left from previous mechanical treatment, there are visible signs of rust, areas depleted by chrome.

Stainless Steels in Nitric Acid | Nitric Acid | Stainless

In acid solutions above 90% HNO3.5% of nitric acid often restores passivity to Type 316L stainless steel or Alloy 20 in sulphuric acid and acts effectively as a corrosion inhibitor. Zirconium is resistant to nitric acid at all concentrations up to the boiling point.

Stainless Steel Sorting and Identification Tests

Nitric Acid Reaction. Stainless steels from nonstainless steels. 1. Either, place a drop of strong nitric acid on the steel surface, or the steel in acid solution at room temperature. 2. Test standard samples, such as stainless and nonstainless steel samples, in the same way.

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