Daman offers a wide range of material choices to meet most pressure rating, application, environment, and cost requirements. While the vast majority of products that we build have criteria that are best served by 6061-T6511 aluminum or 65-45-12 ductile iron, we also frequently review requests for custom products in other grades of aluminum and ductile iron, as well as stainless steel, carbon steel, and other advanced materials.
6061-T651 - Used in our entire aluminum standard product line and 99% of our custom aluminum products. Items built from the extruded bar are -T6511 temper and items built from plate are –T651 temper.
2024-T351 - Used for a small number of custom parts when specified. Usually, it is chosen over 6061 when improved material strength is needed. The majority of what we purchase is plate.
7075-T351 - Used for a small number of custom parts when specified. Usually, it is chosen over 6061 when improved material strength is needed. The majority of what we purchase is plate.
65-45-12 - Used in our entire ductile standard product line and nearly all of our custom ductile products.
80-55-06 - Used for a very small number of custom parts. Usually, it is chosen over 65-45-12 when improved material strength is needed.
Aluminum and ductile iron have been the standard in the manifold world for years, but stainless steel is quickly becoming more common in the hydraulic manifold industry. Its strength, durability, and excellent corrosion resistance make it the optimal choice for certain applications such as subsea, mining, and corrosive environments. Other applications include oil and gas, washdown, semiconductor, and the food industry.
Daman can produce most of its standard and custom products in stainless steel, including cavity body applications, and we are continuously expanding our stainless machining capabilities.
In many cases, Daman can use readily available 17-4h1150 stainless steel in place of ductile iron. It is much stronger than its more popular cousins 304 and 316. On the Rockwell C scale, it has a hardness of 28 and a yield strength of 105,000 PSI.
Some things to consider when choosing your material are pressure, application, and the environment where the manifold will be used. Working pressure should be considered in accordance with ISO 4413.
Our stainless steel products are passivated to maximize the natural corrosion resistance of the material. This process removes surface contamination that can potentially form rust or initiate corrosion.
As stainless steel takes on a larger role in the hydraulic manifold industry, Daman will continue to invest in equipment, tooling, and training for the expansion of our custom and standard stainless steel offerings.
Contact us with any stainless steel standard or custom opportunity.
Ductile Iron Versus Carbon Steel
65-45-12 ductile iron has several qualities that make it the preferred material choice for applications of
5000 PSI maximum operating pressure. The main advantage over carbon steel is ease of manufacturability and a consistent grain structure that allows for ease of manufacturability, uniform corrosion resistance, better material quality, and improved dampening characteristics.
Daman custom product designs include industry common steels such as 1018 and 11L17. Daman has experience manufacturing custom product from many other materials including brass. Contact us to discuss your material requirements.
TIPS FOR MATERIAL SELECTION
Material selection requires the consideration of several hydraulic system characteristics such as pressure, application characteristics such as duty cycle, and environmental characteristics such as the atmosphere. Working pressure should be considered in accordance with ISO 4413 to determine the appropriate material type. The characteristics below are common considerations for aluminum or ductile alloy.
Hydraulic System Characteristics
The most obvious hydraulic criteria for material selection is system operating pressure. We rate nearly all off our 6061-T6 aluminum standard products, and all Daman designed custom parts for 3000 PSI maximum operating pressure, with a 3:1 safety factor.
We rate nearly all of our 65-45-12 ductile standard products, and all Daman designed ductile custom parts for 5000 PSI maximum operating pressure, with a 3:1 safety factor.
This rating is set based on the assumption that the system is properly designed, assembled, and maintained for its application and environment, and that it is used in an average duty cycle application.
Customer designs must be reviewed for wall thickness integrity prior to assigning a Daman pressure rating. Following are some examples of hydraulic system characteristics that may necessitate overriding pressure rating as the determining factor in material selection.
Contact us to discuss other technical characteristics and mechanical properties such as temper designations, nominal chemical compositions, and typical mechanical and physical properties for all materials.