Haihao Group supplies GOST 33259 flat and blind flanges to Belarus Client
Haihao Group recently completed the production and shipment of a series of flat flanges and blind flanges for a key project in Belarus. Manufactured in stainless steel grade 321, these flanges were produced according to GOST 33259 and customer-supplied drawings for special items.
The delivery scope included a range of flange sizes, from DN65 PN10 up to DN200 PN10, all with raised face (RF) or special groove types as required. Our engineering and production teams strictly followed the provided specifications to ensure each flange met dimensional and metallurgical requirements.
GOST 33259 stainless steel 321 flat flanges supplied by Haihao Group for Belarus project
Strict Control of Chemical Composition
All materials used for this order were produced with precise chemical composition control, fully conforming to the client’s specification:
- C ≤ 0.08%
- Si ≤ 0.08%
- Mn ≤ 2.00%
- Ni: 9.00 – 11.00%
- S ≤ 0.020%
- P ≤ 0.035%
We ensured full traceability of the raw material, with certified heat numbers corresponding to each flange. The Material Test Certificates (MTCs) reflect this strict adherence to the agreed chemical and mechanical standards.
GOST 33259 stainless steel 321 blind flanges
Complete Testing and Documentation
To support the quality of this delivery, Haihao Group provided comprehensive documentation, including:
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3.1 and 3.2 certificates, verified by third-party inspection authorities
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Detailed dimensional inspection reports for each flange size
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Mechanical property reports, confirming compliance with GOST and project standards
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Impact test reports, as required for the project
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Non-destructive examination (NDE) reports for selected items
Each flange was supplied in a clean, passivated condition and packaged according to export standards for safe delivery to the project site.
Delivering Custom Engineered Flanges with Full Quality Assurance
With this shipment, Haihao Group once again demonstrated its capability to deliver GOST 33259 flanges and customized forged products for international projects, maintaining strict control over both manufacturing and material quality.
If your project requires stainless steel flanges with strict chemical composition and third-party certification, reach out to Haihao Group. We supply more than products — we deliver confidence in quality, compliance, and on-time performance.