Haihao Group Supplied GOST 33259 Stainless Steel Flanges and Blind Flanges for Russian Project

Haihao Group has completed the production and delivery of a batch of flange products for a customer in Russia, including stainless steel weld neck flanges and blind flanges manufactured according to project drawings and technical requirements. The supplied products were produced with SS316L and ASTM A350 LF2-IV materials, complying with GOST 33259-2015 requirements.

For this order, the customer required strict low-temperature performance. All specified flange products were subject to heat treatment and impact toughness requirements at -60℃, with KCU values not less than 34.3 J/cm² and KCV values not less than 29 J/cm². These requirements ensure reliable mechanical performance in cold-service environments such as oil & gas transportation, chemical processing, and energy projects.

Project Background: Flange Supply for Russian Industrial Application

As a professional pipeline component manufacturer, Haihao Group provides customized flange solutions for international projects. This Russian order included different types of forged flanges and blind flanges with special requirements for material performance, heat treatment, and impact testing.

The GOST 33259 flange is widely used in pipeline systems where dimensional accuracy, pressure resistance, and sealing reliability are essential. According to the customer’s specifications, Haihao Group manufactured weld neck flanges with different pressure classes and sealing surface types, including J, E, and F sealing faces.

The SS316L flange products were selected for applications requiring excellent corrosion resistance, while ASTM A350 LF2-IV flanges were supplied for low-temperature service conditions.

Haihao Group GOST 33259 stainless steel weld neck flange and blind flange shipment for Russian project

Product Details

Manufacturing and Quality Control

To meet the customer’s technical specifications, Haihao Group carried out strict manufacturing control throughout the production process.

The production process included:

• Raw material verification according to material certificates
• Heat treatment according to technical requirements
• Mechanical property inspection
• Chemical composition analysis
• Hardness testing
• Low-temperature impact testing at -60℃
• Dimensional inspection according to drawings and standards

For the GOST 33259 flange supplied in this project, impact toughness testing was a key inspection item. The required KCU and KCV values confirm that the flanges maintain sufficient toughness under extremely cold working conditions.

SS316L and A350 LF2-IV Flange Material Advantages

The SS316L flange is commonly selected for applications requiring strong corrosion resistance and stable performance in aggressive environments. The addition of molybdenum improves resistance to pitting and corrosion, making SS316L suitable for chemical, offshore, and process pipeline systems.

For low-temperature applications, ASTM A350 LF2-IV provides excellent toughness and impact resistance. Combined with heat treatment and strict inspection procedures, these flanges can meet demanding operating conditions.

The combination of SS316L, A350 LF2-IV, and GOST requirements allows Haihao Group to provide reliable flange solutions for different industrial environments.

Haihao Group’s Capability in Custom Flange Manufacturing

Haihao Group has extensive experience producing international standard pipeline components, including flanges, pipe fittings, steel pipes, and customized forged products. We support customers with drawing-based manufacturing, special material requirements, and inspection documentation.

Whether customers require a GOST 33259 flange, stainless steel flange, or low-temperature carbon steel flange, Haihao Group can provide products manufactured according to project specifications.

Contact Haihao Group for customized flange solutions for oil & gas, chemical, power generation, and industrial pipeline projects.