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Have you also wondered what the difference is between A2, A4 and A5?Read more ...Here we will try to clear up the concepts a bit. In everyday speech, stainless steel is referred to as A2 and...
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A2 och A4 – vad är det vi pratar om?Read more ...Vad är skillnaden mellan rostfritt (A2) och rostfritt syrafast (A4)? Vad betyder beteckningarna?A, F och CSkruvar och...
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Have you also wondered what the difference is between A2, A4 and A5?Here we will try to clear up the concepts a bit. In everyday speech, stainless steel is referred to as A2 and...Read more ...
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A2 och A4 – vad är det vi pratar om?Vad är skillnaden mellan rostfritt (A2) och rostfritt syrafast (A4)? Vad betyder beteckningarna?A, F och CSkruvar och...Read more ...
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Newsletter from Värmdö MarineThings, April 2021You don't forget how you look yourself. It is an important part of self-esteem to know if you are well dressed for...Read more ...
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Old boat enginesAdditional pictures from the trip to Rindö in September during the maritime museum's open house.Read more ...
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Some fine treasures at the Maritime MuseumWe visited the Maritime Museum's open house on a nice late summer day in September when they were showing parts of...Read more ...
Have you also wondered what the difference is between A2, A4 and A5?
Have you also wondered what the difference is between A2, A4 and A5?
Are there corresponding names in EN standard? And what is AISI?
Here we will try to clarify the concepts a bit. In everyday speech, stainless steel is referred to as A2 and stainless acid-resistant steel as A4, so A2 stands for stainless and A4 for stainless acid-resistant steel. But unfortunately that does not say everything about what kind of steel we are dealing with. Nor can it be directly translated into an EN standard*.
An A designation can include several types of steel, that designation has a broader meaning. Below is a small table of different A designations:
A1 – chrome/ nickel steel with sulfur vs machine steel
A2 – chrome/ nickel-steel plain stainless
A3 – chrome/ nickel steel stabilized with titanium, niobium and tantalum
A4 – chrome/ nickel-steel with molybdenum
A5 – chrome/ nickel steel with molybdenum stabilized with titanium, niobium and tantalum
An A2 screw can be made of EN 1.4301 or EN 1.4306. An A5 screw can be made of EN 1.4571 or EN 1.4580 In EN ISO 3506, A stands for austenitic**.
We delve into the EN designations are taken up another blog post.
* EN standard=European standard from CEN or CENELEC
(CEN=European Committee for Standardization. Prepares European standards for areas not covered by CENELEC and ETSI.)
(CENLEC=European Committee for Electrotechnical Standardization. Develops European standards in the field of electricity.)
**Austenite, Is a metallurgical term for one of three crystal structures that form under atmospheric pressure between 912 - 1394 °C. Austenite named after a British metallurgist, W.C. Roberts-Austen.
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About stanless steel
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