R-45 / R-46 Ring Joint Gasket (Low Carbon Steel) | API 6A / ASME B16.20 RTJ Flange Seal

The R-45 and R-46 Ring Joint Gaskets (RTJ) manufactured from premium Low Carbon Steel are critical metallic sealing components engineered for high-pressure, high-temperature flanged connections in the oil, gas, and petrochemical industries. Designed to be housed within the precision-machined grooves of API 6B or standard ASME/ANSI B16.5 flanges, these metallic rings create a highly secure, leak-proof metal-to-metal seal when the flange bolts are tightened. They are an absolute necessity for ensuring environmental safety and pressure containment in large-bore wellheads, pipeline manifolds, and heavy-duty valve assemblies.

The defining characteristic of these R-45 and R-46 gaskets is their Low Carbon Steel metallurgy. To create a perfect seal without causing irreversible damage to the expensive flange faces, the gasket material must be softer than the flange itself. This Low Carbon Steel gasket is strictly manufactured with a maximum hardness of 120 HB (Brinell). During installation, the softer gasket undergoes "coining"—a controlled plastic deformation—allowing it to flow into the microscopic imperfections of the flange groove, resulting in a bubble-tight barrier against high-pressure fluids and gases. To prevent rust and degradation during storage and prior to installation, the low carbon steel is typically treated with a protective zinc or cadmium anti-corrosive plating.

Available in both standard oval and octagonal cross-sections, the R-45 and R-46 gaskets provide extreme reliability for non-corrosive (standard service) applications. Engineered in strict compliance with API 6A and ASME B16.20 specifications, these ring joint gaskets ensure exact dimensional tolerances and unmatched sealing performance for critical infrastructure.

Features & Benefits

• API & ASME Compliant: Manufactured to strict API 6A and ASME B16.20 dimensional and material standards, ensuring perfect fitment in R-45 and R-46 flange grooves.

• Controlled Hardness: Heat-treated to a maximum hardness of 120 HB (68 HRB) to guarantee the gasket deforms before the flange groove, protecting expensive pipeline equipment from scoring.

• Metal-to-Metal Seal: Provides a blowout-proof, extreme-pressure seal capable of withstanding the intense physical loads of heavy-duty oilfield environments.

• Low Carbon Steel Construction: The industry standard for non-corrosive, standard-service wellhead and pipeline applications, offering an excellent balance of malleability and strength.

• Corrosion Protection: Treated with a standard zinc or cadmium plating to prevent surface rust and oxidation prior to deployment in the field.

Specifications & Technical Details

Applications

These R-45 and R-46 Low Carbon Steel Ring Gaskets are essential for establishing secure flanged connections across the energy sector. Typical applications include sealing API 6B wellhead and Christmas tree flanges, connecting high-pressure pipeline segments, integrating heavy-duty gate and choke valves into manifold systems, and providing reliable pressure containment in standard-service refinery and petrochemical pipelines.

Quality Assurance

Each ring joint gasket undergoes stringent quality control testing. This includes rigorous dimensional inspections to ensure exact API/ASME sizing, surface finish evaluations to guarantee a smooth sealing face, and mandatory hardness testing (Brinell/Rockwell) to verify the material is within the acceptable softness range to protect field flanges.

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