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Corrosion (part 4 of 4)

This is the fourth and last in a series of blogs on corrosion and corrosion resistance in our stock grades. The first three blogs (found on our web site) looked at types of corrosion and the steps we take to minimise it, the factors (particularly chemistry) that affect a metals’ ability to withstand corrosion, and tests for corrosion and a quick way of ranking materials resistance against pitting corrosion. This final blog in the series will compare our stock grades rank in terms of corrosion resistance.

Rank “scores”:3 = EXCELLENT 2= GOOD 1=NOT APPLICABLE Sulphuric Acid Hydrochloric Acid Hydroflouric Acid Phosphoric Acid Nitric Acid Organic Acids Alkaline & Salts Seawater
MP35N – outstanding crevice and stress corrosion resistance in hydrogen sulphide, salt water and other chloride environments, as well as from mineral acids (nitric, hydrochloric and sulphur).
Rank 3 3 3 3 3 3 3 3
Alloy 286 / 660 – good corrosion resistance at temperatures up to 700oC
Rank 2 2 2 2 2 2 1 1
Alloy 400 – very good corrosion resistance, particularly stress corrosion cracking
Rank 3 3 2 3 3 3 3 3
Alloy K500 – good against sea water / dilute hydrofluoric, and sulphuric acids
Rank 3 2 3 3 1 3 3 3
Alloy 625 – resistant to aggressive media / resists crevice corrosion / pitting corrosion / high-temperature oxidation
Rank 3 3 3 3 3 3 3 3
Alloy718 – general corrosion resistance
Rank 2 2 2 2 2 3 3 3
Alloy 725 – corrosion resistance equal to Alloy 625, but with higher strength in the material itself.
Rank 3 3 3 3 3 3 3 3
Alloy C276 – resistant to reducing and mildly oxidizing environments / localised corrosion attacks & stress corrosion cracking.
Rank 3 3 3 3 2 3 3 3
Alloy 800 – superior strength and corrosion resistance below 650 deg C, used in chemical, petrochemical, food processing & nuclear engineering.
Rank 2 2 1 2 3 3 2 2
Alloy 825 – excellent resistant to sulphuric & phosphoric acids / resistant to reducing & oxidising acids / resistant to pitting / resistant to stress corrosion cracking / resistant to inter-granular corrosion.
Rank 3 3 3 3 3 3 3 3
Alloy 925 – comparable corrosion resistance as Alloy 825, but with higher strength (in age hardened condition)
Rank 3 3 3 3 3 3 3 3
HTS 316 – comparable corrosion resistance as Alloy 825, but with higher strength (in age hardened condition)
Rank 3 3 1 3 3 3 3 1

If you have any questions on the applicability of our stock grades in particular circumstances, or what you can do to reduce the risk of corrosion when handling metal, please do not hesitate to contact our Special Process department on ++44 114 232 9241.

The Broder Blogger

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