Hydraulic Cylinders

The Oil and Gas market depends on the ability of hydraulic cylinders for several critical applications. As the cylinders of these rods are subject to abrasion, sliding wear and even corrosive environments, it is important to be certain they are protected as well as possible from the elements to maintain reliable, long-lasting operation.

Metco 17020x materials are offer superior protection on riser tensioners for offshore oil platforms.

To achieve maximum protection, conventional laser cladding or high-speed laser cladding (EHLA) deposits can be applied. Metco Joining & Cladding offers several surfacing alloys for these applications that provide unrivaled performance compared to conventional products. These materials can be applied crack-free, ensuring optimal protection and can be ground and finished to highly polished surfaces.

Metco 1020X

Metco 1020x series of cladding powders have a unique ferritic stainless steel composition comparable to 400 series stainless steel. Deposits of Metco 1020x exhibit improved abrasive and sliding wear resistance than type 431 stainless steel with similar corrosion resistance. It is recommended primarily for atmospheric applications where improved wear resistance is desirable and corrosion is a secondary concern.

The stable ferritic structure of the Metco 1020x series overlays applies more reliably and consistently than martensitic steel overlays, resulting in more predictable service performance. Although deposits of Metco 1020x are not as hard as their martensitic steel counterparts, the wear resistance is better as a result of homogeneously distributed hard-phase precipitates that develop during cladding.

While many applications may need only a single overlay of Metco 1020x, multiple layers can be applied crack-free, thus allowing it to be used for the restoration of damaged components. Moreover, thicker deposits provide longer-lasting resistance to sliding wear and highly abrasive conditions.

Metco 1020A is designed for application using conventional laser cladding or plasma transferred arc (PTA), whereas Metco 1020B is designed for application using high-speed laser cladding (EHLA). Finishing of Metco 1020x overlays can be readily accomplished using conventional silicon-carbide grinding wheels.

Typical Uses and Applications

Cost-effective alternative for hard chromium plating
Hard-bearing surfaces such as bearing journals, mud pump rotors, sleeves,
Resist abrasive grains (low temperature) for cylinder liners, pistons, pumpjack sucker rods, pump plungers, hydraulic rams, crankshaft bearings
Resist hard surfaces (low temperature) for wire drawing, capstans, pump seals, mechanical seals
Resist intended or non-intended fretting motion on components such as machine bedways, wear rings, press-fit bearing seats
Hydroelectric valves
Salvage and build-up of grindable steels: mis-machined parts, worn parts

Although the hardness of overlays produced using the Metco 1020x family of products are generally significantly lower than that of 400-series stainless steels, the abrasion resistance is far better per ASTM G65A volume loss testing. In addition, the abrasion resistance compared to a popular competitor for this application indicate that overlays of the Metco 1020x family of products provide significantly better performance per ASTM G65E volume loss testing.

Abrasion resistance of Metco 1020 compared to martensitic stainless steels and competitor solutions.

Metco 1720x

Metco 1720x series materials are proprietary nickel-based, superalloy hardfacing powders. Metco 1720x powders are designed to produce overlays that provide corrosion protection equivalent to Inconel 625 and Ultimet overlays. However, the wear protection provided by Metco 1720x overlays is significantly better. Metco 1720x can be applied crack-free using conventional laser cladding or EHLA. Corrosion and wear resistance are accomplished via precipitates of isolated hard phases that form during the cladding process in a corrosion-resistant nickel-rich matrix.

Use Metco 1720x when corrosion is a primary concern and wear resistance better than that of Inconel 625 or Ultimet is desired. These materials can be clad as a single or in multiple crack-free layers, making Metco 1720x excellent choices for salvage and restoration of worn and undersized components. The overlay can be ground to a very good finish using silicon carbide wheels.

Apply Metco 1720A using conventional laser cladding or PTA. Apply Metco 1720B using EHLA.

Recommended Applications for Metco 1720x

Hydraulic cylinder rods, such as riser tensioners, operating in marine and other corrosive environments
Hard chromium plating alternative
Hard bearing surfaces such as journals, pump rotors and sleeves
Resist abrasive grains and hard surfaces (low temperature) for cylinder liners, pistons, pump plungers and seals, other mechanical seals, hydraulic rams, crankshaft bearings wire drawing capstans
Hydroelectric valves
Salvage and restoration of grindable steels: mis-machined or worn components

Abrasion Resistance Improvement

As indicated through ASTM G65-A volume loss testing (chart to the right), the abrasion resistance of overlays of Metco 1720x materials are far better than overlays of Inconel 625 or Ultimet, which are commonly used to protect hydraulic rods in marine and non-marine applications where corrosion is a major issue.

Abrasion resistance of Metco 1720A compared to Inconel 625 and Ultimet.

Hardness Comparison

Metco 1720A is considerably harder than either Inconel 625 or Ultimet in the as-welded condition. This higher hardness results in significantly better wear resistance. In addition, deposits of Metco 1720A can be work hardened or roller hardened to achieve an additional 20% increase in hardness.

As-welded hardness comparison for Metco 1720A versus Inconel 625 and Ultimet

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