Large Diameter Brass Washers

The manufacturing process of Large Diameter Brass Washers is based on dimensional accuracy requirements and usually uses strip stamping or bar turning. For specifications with an outer diameter of less than 150 mm, high-speed precision stamping can ensure edge quality and a material utilization rate of more than 85%, while gaskets with an outer diameter of more than 200 mm are processed by CNC turning. Although the material utilization rate is reduced to about 60%, higher dimensional consistency and surface finish can be obtained. According to the ASTM E18 Rockwell hardness test, the hardness of the stamping edge can reach HRB 75 to 82 due to cold work hardening, which is about 12% higher than the HRB 68 to 72 in the central area. This hardness gradient allows the edge area to have a higher resistance to intrusion when a large-diameter gasket is subjected to uneven loads, effectively preventing the edge of the bolt head from being embedded in the surface of the gasket and causing preload relaxation.

 

 

In high-temperature applications, the mechanical properties of brass gaskets gradually decrease as the temperature increases, but the difference in thermal expansion characteristics between them and adjacent steel flanges needs to be considered in the design. According to the ASTM E228 thermal expansion coefficient measurement method, the average linear expansion coefficient of C27000 brass in the range of 20 to 200 degrees Celsius is 20.4 microns per meter per Kelvin, while ordinary carbon steel is only 11.7 microns per meter per Kelvin. When the operating temperature rises from room temperature to 150 degrees Celsius, the radial expansion of a brass washer with an outer diameter of 100 millimeters is approximately 0.26 millimeters. This expansion can partially compensate for the loss of pre-tightening force caused by the thermal elongation of the bolt.

 

 

According to the ASTM E9 high temperature compression test, after applying a compressive stress of 200 MPa and holding the load for 100 hours at 200 degrees Celsius, the creep strain of the gasket is approximately 0.2%, which is much lower than the 0.6% of industrial pure copper at the same temperature, indicating that brass has better creep resistance. Therefore, large-diameter brass washers can coordinate and maintain sealing pressure through their own thermal deformation in situations of alternating temperatures, such as steam pipe flanges and hot oil pump interfaces. At the same time, their low thermal conductivity is about 110 watts per meter per Kelvin measured according to the ASTM E1461 laser flash method, which can moderately reduce bolt heat conduction and protect the thread pair from excessive thermal aging.

 

 

 

 

 

 

 

Obtain drawings from clients or produce drawings based on their samples or specifications.

The drawings, product raw materials, surface treatment, and other details are attested to by both parties.

 

 

 

 

Provide a quote, ensure that the order quantity is accurate, and include all relevant details,

such as the terms of payment, the terms of trade, the type of packaging, etc.

 

 

 

Follow the original drawings and samples exactly when producing the goods.

It was carefully packaged and delivered to the clients following a final inspection.

 

 

 

 

 

 

 

 

 

 

 

 

 

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