Types of Steel to Manufacture Stainless Hose End Fittings
Depending on the environment and the process they're involved in, hydraulic hose end fittings may experience different degrees of corrosion and degrade over time. Considering the harsh working environments of hydraulic systems in heavy machinery or plant equipment, many have had to rely on stainless steel as a viable option for these fittings for longevity and shorter downtimes during emergency maintenance.
Steel
The wide use of steel in our industries is a testament to its importance. It's largely composed of iron and carbon that account for its characteristic strength and toughness. Additional metals, like zinc, copper, chromium, manganese, and molybdenum, give it other properties like corrosion resistance and durability.
Stainless steel is one such variant of steel comprising mainly of carbon, iron, nickel, and chromium. The additional chromium in its metallurgy provides it with corrosion-resistant properties. Here are some commonly used grades for manufacturing hose end fittings.
304
The SAE 304, UNS 30400, and ASTM A276 are the common standards for this type of steel grade. It is the most commonly used grade of stainless steel, known as 18/8, throughout the industry. That's because its standards call for a minimum of 18% chromium and 8% nickel to be added during manufacturing.
It is easy to work with, giving the right combination of strength and flexibility that allows it to be rolled in sheets, formed into shape via presses, and used as stock for machining into final products. The zinc and chromium give it corrosion-resistance properties, forming an oxide layer on its surface to survive in harsh chemical environments. This also makes it easier to clean with tough chemicals, making it ideal for making sanitary hose end fittings for the food industry.
There is one drawback; however, 304 stainless steel is susceptible to chloride corrosion. This vulnerability makes it unsuitable for marine and offshore applications where high concentrations of chloride salts cause pitting on its surface and penetrate deeper into the steel to weaken its structure.
316
Luckily, other grades of steel exist that can combat chloride corrosion. 316 stainless steel variants are the most commonly used after 304 grades. Although 1.5 times costlier than 304-grade steel, it provides excellent corrosion resistance for hose end fittings.
Its chemical composition is similar to 304 steel; however, the additional element molybdenum deters chlorides from invading its surface and gives it thermal properties that make machining easier.
Which Stainless Steel Fitting Should You Select?
There exist many types of hose end fittings other than stainless steel ones like brass, aluminum, and carbon steel. The one you select depends on your budget, required hose service life, the process fluid carried, and the external environment. If the environment or fluid transported is particularly corrosive, then stainless steel hose end fittings are a requirement. Other metal fittings, although inexpensive, will corrode and affect the integrity of your hydraulic system. Stainless steel fittings can last longer, providing the same, if not more, value for money as ordinary fittings.
Frequently Asked Questions
What are the most common types of pipe fittings?
The most common types of pipe fittings include couplings, elbows, tees, reducers, adapters, unions, and caps. Each serves a specific purpose in a piping system. Couplings connect pipe sections, elbows change flow direction, tees split or combine flow, and reducers connect different pipe sizes.
At Titan Fittings, we offer a variety of stainless steel fittings designed to provide secure, reliable connections for industrial, hydraulic, and fluid-transfer applications.
How do I measure pipe fittings accurately?
To measure pipe fittings accurately, first identify whether the connection has male or female threads. Measure the outside diameter of male threads or the inside diameter of female threads using a caliper. Next, determine thread pitch using a thread gauge and identify the thread standard, such as NPT or BSP.
Compare these measurements with a thread identification chart. Also verify the nominal pipe size, connection type, and applicable pipe schedule to ensure compatibility.
Titan Fittings provides technical resources to help customers identify and select correctly sized fittings.
What are brass pipe fittings used for?
Brass pipe fittings are commonly used in plumbing, water distribution, compressed air systems, HVAC equipment, and certain industrial applications. Brass offers good machinability, moderate strength, and corrosion resistance in compatible environments.
However, stainless steel may be a better choice for demanding industrial applications involving high pressures, aggressive fluids, or corrosive environments.
Titan Fittings helps customers evaluate fitting materials based on application requirements, pressure ratings, temperature, and fluid compatibility.
How do I connect two pipes of different sizes?
To connect pipes of different sizes, use a reducing coupling, reducer, or reducing adapter that matches the pipe diameters and connection types.
Concentric reducers maintain a common centerline, while eccentric reducers provide an offset that may be useful for drainage, venting, or avoiding air pockets in certain piping configurations.
Titan Fittings offers stainless steel reducers and adapters for connecting different sizes and fitting configurations while maintaining system integrity.
What industries commonly use pipe fittings?
Pipe fittings are essential in oil and gas, chemical processing, industrial manufacturing, hydraulic equipment, HVAC, agriculture, food processing, and data center liquid cooling.
These industries depend on fittings to connect components, control flow direction, accommodate diameter changes, and maintain reliable fluid or gas transportation.
Titan Fittings supplies industrial fitting solutions for applications requiring dependable performance, material compatibility, and pressure-rated connections.
Why is it important to choose the right pipe fitting?
Choosing the correct pipe fitting helps prevent leaks, pressure loss, premature wear, corrosion, and unexpected equipment downtime.
An improperly selected fitting can compromise system reliability even when the surrounding equipment is correctly specified.
At Titan Fittings, we recommend evaluating material grade, pressure and temperature ratings, thread compatibility, connection dimensions, and operating conditions before selecting a fitting.
Are stainless steel fittings better than brass fittings?
Stainless steel fittings are often preferred for demanding industrial applications because of their strength, durability, and corrosion resistance. Brass fittings are generally more economical and easier to machine, making them suitable for many lower-pressure plumbing and general-purpose applications.
Neither material is universally better. Titan Fittings recommends selecting the material that best matches the operating pressure, fluid chemistry, temperature, environment, and service-life requirements.
Are stainless steel fittings stronger than brass fittings?
Stainless steel fittings generally offer higher mechanical strength than comparable brass fittings, making stainless steel a frequent choice for demanding industrial and high-pressure applications.
However, actual fitting performance depends on the alloy, geometry, manufacturing process, temperature, and published pressure rating.
Titan Fittings recommends selecting fittings based on verified component ratings rather than assuming every stainless steel fitting can withstand higher pressure than every brass fitting.
Which fitting material (Brass or Stainless Steel) is better for high-pressure hydraulic systems?
Stainless steel is often a preferred material for high-pressure hydraulic applications because of its mechanical strength and durability.
However, the correct choice depends on the specific fitting's rated working pressure, sealing design, temperature, and compatibility with the hydraulic fluid.
Titan Fittings recommends using pressure-rated stainless steel hydraulic fittings that meet the system's operating and applicable safety requirements.
Can compression fitting ferrules be reused?
Compression fitting ferrules undergo controlled deformation during their initial installation to grip the tubing and establish a reliable seal.
Previously swaged ferrules generally should not be removed and installed on new tubing because their deformation and gripping characteristics have changed.
Titan Fittings recommends using new ferrules for new tube connections. Reassembly of an existing fitting with the original ferrules attached to the same tubing is a separate procedure that may be permitted by the manufacturer.
What causes reused compression fittings to leak?
Compression fittings may leak after improper reuse because of damaged ferrules, altered sealing surfaces, scratched tubing, contamination, misalignment, or incorrect reassembly.
Removing preswaged ferrules and attempting to install them on different tubing can also compromise the original gripping and sealing geometry.
Titan Fittings recommends inspecting previously assembled components and replacing damaged parts before returning a connection to service.
When should instrumentation fitting ferrules be replaced?
Ferrules should be replaced when they show damage, cracking, excessive wear, corrosion, or other conditions that compromise sealing performance.
New ferrules are generally required when creating a new connection on fresh tubing rather than reassembling an existing qualified assembly.
Titan Fittings recommends following the applicable fitting manufacturer's replacement and reassembly instructions instead of reusing questionable components.
How do you prevent galling in stainless steel threaded fittings?
Thread galling can be reduced by using compatible lubricants or anti-seize compounds where appropriate, keeping threads clean, avoiding cross-threading, and preventing excessive tightening speed or force.
Properly matching threads and following manufacturer installation instructions are also essential.
Titan Fittings recommends inspecting threaded components before assembly and replacing fittings with damaged threads.
Can stainless steel fittings be reused after galling occurs?
Fittings with significant galling, torn threads, or seizure damage generally should not be reused.
Damaged threads can compromise engagement, sealing performance, and the connection's mechanical integrity.
Titan Fittings recommends replacing visibly damaged components rather than attempting to restore severely galled threads for pressure-containing service.
More questions: Pipe Fittings: Types, Applications & Selection