The development of high alloy materials is an ever changing and growing industry. The expertise that Corrotherm International Limited lends to this market is found firmly rooted with over 150 years of collective, industry specific, knowledge and expertise. In this series of posts we’ll look at the development of high performance alloys and where Corrotherm adds value if you are in the market for them.
Before the 1950’s the choice of alloys to combat corrosion was very limited. The latter half of the 20th Century saw a phenomenal growth in the development of new nickel base alloys for highly corrosive applications.
Today engineers and designers have a wide spectrum of corrosion resistant alloys to choose from when trying to prevent a corrosion problem, which is present within many of the power generation, oil and gas, aerospace and automotive industries throughout the world.
The table below illustrates how corrosion resistance improves as the alloy content increases. This evidence is calculated using the PRE (Pitting Resistance Equivalent).
| Alloy Group | Generic Description | UNS no | PRE’s |
| Group I | Fe based 18/8 austenitic stainless steels | S30400,S31600,S32100 etc. | 24 |
| Group II | High performance austenitic stainless steels | N08028,N08020 etc. | 29 – 38 |
| Group III | Ni based general purpose alloys | N02200,N04400,N06600 N08800 etc. | 32 – 45 |
| Group IV | 6% molybdenum super-austenitic stainless steels | N08926,N08267, N08904 etc. | 37 – 48 |
| Group V | Nickel based high performance alloys | N06686,N10276,N06022 | 65 – 74 |
The drive to develop improved corrosion-resistant alloys has been lead by the need to increase production efficiency through working at higher temperatures, higher pressures and using aggressive catalysts. Operators demand shorter and fewer maintenance shutdowns and have a need for environmental protection measures, to prevent leaks and emissions.
Product Focus: The 6Mo Alloys
The development of the 6Mo alloys was seen as a cost effective way of strengthening alloys used in corrosive applications. The addition of chromium and molybdenum improves corrosion resistance and increased nickel and nitrogen enhances resistance to stress corrosion cracking.
The 6Mo Alloys are used extensively in pulp and paper production applications, copper smelting, production and reclamation of sulphuric acid, marine and offshore applications, heat exchangers using seawater and brackish water as coolant and pickling baths.
The Corrotherm Factor
Jan Ward, CEO of Corrotherm International, said: “Our high alloy materials are designed to save money by providing a longer life and consequently lower maintenance costs in applications where there are high level corrosion or high temperature process.
“Many of the products that we supply are bespoke, more often than not there is no standard solution for the markets and applications that we trade in. By utilising the knowledge from the entire team we often provide our customers with unique and novel solutions.”
Completing more than a supply of high performance alloys, Corrotherm International fully support clients throughout every stage of the manufacturing and supply process, with highly trained pre-sales and after-sales support teams.
An unrivalled product portfolio of high alloy materials coupled with a comprehensive understanding of the manufacturing and testing processes helps Corrotherm International stand out from the crowd.
