How To Prevent Stainless Steel Galling

What is Stainless Steel Galling?

Stainless steel galling, also known as cold welding, is a form of severe adhesive wear that can occur between two moving stainless steel surfaces. Galling can occur with any material, although stainless steel is prone to galling under specific conditions where high friction is involved. While stainless steels have a tendency to gall more than other materials, galling can affect a range of metals. This form of wear happens when friction disrupts the protective oxide layer on the surface of stainless steel, allowing the metal surfaces to come into direct contact and bond together.

What happens when Stainless Steels Galls?

When severe galling occurs, the affected parts can become so tightly bound that they behave as though they’ve been welded together, making separation impossible. This is why the phenomenon is often referred to as ‘cold welding’. Once galling sets in, parts like bolts, fasteners, or turnbuckles may seize up entirely, rendering them unusable and possibly damaging the surrounding components. Several factors, including interference, debris, and heat build-up, can accelerate the process.

The British Stainless Steel Association (BSSA) outlines the main factors contributing to wear and galling as follows:

• Design
• Applied load
• Contact area and degree of movement
• Lubrication
• Environment
• Material properties (surface finish, hardness, and steel microstructure)

How to prevent Stainless Steel galling?

To avoid the risks of stainless steel galling, it is essential to take precautionary steps during installation and maintenance. Here are some key methods to help prevent galling:

1. Slow Down the Installation Speed
   The heat generated by friction during fast installation is a major contributor to galling. To reduce this risk, it is advisable to install stainless steel components slowly and manually. Avoid using power tools, as these can produce excessive heat, leading to a higher likelihood of galling.
2. Use Lubrication
   Applying a specialised lubricant, such as Tef-Gel, can drastically reduce the chances of galling by minimising friction. Lubrication creates a protective barrier between the stainless steel surfaces, helping to maintain the oxide layer and prevent metal-on-metal contact. This is particularly important for high-tension applications like rigging and wire rope assemblies.
3. Avoid Damaged or Dirty Threads
   Check all threads on fittings for signs of damage before installation. Even minor debris or rough spots can exacerbate friction, increasing the chances of galling. Ensuring that the threads are clean and in good condition will help minimise the risk.
4. Use Sta-Lok Supajust Turnbuckles
   Sta-Lok’s Supajust Turnbuckles feature permanently sealed threaded bronze inserts, offering superior levels of adjustment even under high load without the risk of seizing or galling. These specially designed turnbuckles ensure that high-performance adjustments can be made smoothly, making them an excellent choice for demanding applications such as marine rigging or architectural installations.

Why use Sta-Lok?

As a premium UK manufacturer, Sta-Lok is a leading supplier of stainless steel products, offering a wide variety of sizes and constructions. Our stainless steel components are manufactured to the highest standards, ensuring reliability and longevity in even the most demanding environments. With  warehouses in both the UK and USA, Sta-Lok can meet your needs quickly and efficiently.

To find out more about Sta-Lok’s supply of stainless steel products and custom wire rope assemblies, contact us today.

01206 390 773

[email protected]