A grade is the answer to a mechanism, not a preference. Pick the condition you are up against and we will show you the grades that address it, the ones that do not, and the questions to settle before you order.
Each guide names the grades that suit the condition, the ones that fail in it, and the questions to settle before you order.
General and localised corrosion by acids, with pitting and crevice corrosion where chlorides are present.
9 grades to consider → Selection guideSustained exposure to oxidising or carburising atmospheres above 600 °C, where grain boundary attack and scale adhesion govern service life.
8 grades to consider → Selection guideHydrogen sulphide embrittlement combined with chloride stress-corrosion cracking in a wet, high-pressure environment.
6 grades to consider → Selection guideChloride seawater with cyclic wet-dry exposure, biofouling and crevice conditions, often with stagnant zones.
7 grades to consider → Selection guideLong design life, elevated temperature, and a documentation regime that is stricter than the material itself.
6 grades to consider →Send us the service description — the medium, the temperature, the pressure, the contaminants and the worst case. If the question is worth asking, it is usually one of these five, but the boundaries blur and we will tell you so rather than pretend otherwise.
Ask us →Every standard we quote against is indexed with its official title, its scope as written, and the grades it covers.
Open the standards library →