• About D&P
  • Contacts
  • Consultancy
  • Newsletter
  • Glossary
Pickling and Passivation Blog
  • Pickling
  • Passivation
  • Stainless
  • Applications
  • F.A.Q.
  • Welding
  • Duplex & PH
  • Tech

Ing. Gianpaolo Orlando

Esperto consulente in decapaggio e passivazione

How did the Stainless Steel born?

How did the Stainless Steel born?

We have so far spoken extensively about stainless steel, its main property ? the passivation ? about the different methods to make a proper and effective pickling, how and why passivate the stainless.

Many curious people (rightly!) write to me asking: ‘How did the Stainless Steel born??

 

As often it happens in history, even the discovery – or rather invention – of stainless steel came from studies in the field of war.

At the beginning of ‘900, an English chemist named Harry Brearley was working in Sheffield at the Brown Firth research laboratories, trying to find a new steel alloy that could withstand erosion caused by high temperatures in the gun barrels.

 

It was already known that adding a little of chromium to the steel alloy increased the melting point and the study of the Dr. Brearley aimed at accurately establishing the relationship between the melting points and the chromium content of various steel samples. To do this and to study the microstructure it was necessary to carry out a polishing and etching of the various samples of steel alloy: the standard method to perform this process was a treatment in mild solution of nitric acid and alcohol.

Dr. Brearley realized that not only some samples were resistant to attack in nitric acid, but even if left at open air, after several days their appearance was still brilliant and would not show even a point of oxidation. Dr. Brearley didn?t know, but he created the first stainless steel and with the nitric acid solution he even well-passivated it!

After several researches, it was determined that the samples with these characteristics showed a high chromium content (at least 10.5% as already seen, to ensure proper passivation). Starting from this research, around the area of ??Sheffield a new industry arose, and it was specifically dedicated to the production and study of stainless steels.

Still today, the stainless steel is also applied in the industry of firearms.

Se vuoi essere sempre tenuto aggiornato sulle novità del Blog iscriviti alla newsletter cliccando QUI.
  • Ing. Gianpaolo Orlando
  • January 26, 2016
  • 2198
  • No Comments
  • ASTM A967, Corrosion Resistance, Cr2O3 layer, EN 10088-1, Grinding, Nitric Acid, Passivation
  • F.A.Q., Stainless

Articoli correlati

Quantitative Passivation Testing - Passivation Tester
Quantitative Test – Stainless Steel Passivation
Stainless steel passivation testing - Passivation tester
Qualitative Testing – Stainless Steel Passivation

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

CAPTCHA
Refresh

*

tag used

Abrasive ASTM A967 Copper Sulphate Corrosion Resistance Cr2O3 layer EN 10088-1 Grinding High Humidity Test Inox Trattamenti SRL Nitric Acid Passivation Passivation Testing Pickling Salt Spray

Recent Posts

  • How did the Stainless Steel born?
  • Quantitative Test – Stainless Steel Passivation
  • Qualitative Testing – Stainless Steel Passivation
  • Stainless Steel Passivation Testing
  • Mechanical Pickling – Stainless Grinding

Category

  • Applications (2)
  • F.A.Q. (3)
  • Passivation (5)
  • Pickling (3)
  • Stainless (3)
  • Tech (5)

Info

  • Privacy and Cookie Policy
  • Sponsor
  • Sitemap

To stay in touch

  • Newsletter
  • Consultancy
  • Contacts

Pickling and Passivation Blog Copyright 2016. All Rights Reserved

Powered by Roberto Bompani Siti web, web design, mobile, e-commerce base.
Dear User, we inform you that this site uses cookies ( own and other sites ) in order to make their services as much as possible efficient, easy to use and profiling . If access to any element of the site, you consent to the use of cookies .OK Read More
Privacy & Cookies Policy

Privacy Overview

This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience.
Necessary
Always Enabled
Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
Non-necessary
Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.
SAVE & ACCEPT