Haihao Group conducts comprehensive quality inspection for MSS SP-97 A182 GR. F53 weldolet for Singapore client

At Haihao Group, ensuring the highest standards of product quality and reliability is our top priority. Recently, we successfully completed the production and rigorous quality inspection of MSS SP-97 Weldolet made from ASTM A182 Grade F53 (UNS S32750) super duplex stainless steel for our esteemed client in Singapore. These fittings are designed to meet the stringent requirements of offshore, petrochemical, and high-pressure applications.

Material Overview: ASTM A182 Grade F53 (UNS S32750)

ASTM A182 GR. F53, also known as UNS S32750, is a super duplex stainless steel known for its excellent combination of high mechanical strength and superior corrosion resistance. It is specifically designed for harsh environments and meets the critical standards of NACE MR0175 / ISO 15156, ensuring safe operation in sour service conditions where hydrogen sulfide (H₂S) is present.

Quality Control and Inspection Procedures

To guarantee product reliability and meet project specifications, Haihao Group conducted a full series of quality inspections, including:

1. Dimensional Inspection

We carried out precise dimensional inspections to ensure the MSS SP-97 Weldolet fittings strictly adhere to standard tolerances. Accurate dimensions are critical for the correct fit and performance of the branch connections.

2. Metallographic Examination

A detailed metallographic analysis was performed to evaluate the microstructure of the F53 material. The examination confirmed a proper duplex phase balance (austenite and ferrite phases), essential for achieving the alloy’s superior mechanical and corrosion-resistant properties.

3. Hardness Testing

Hardness tests were conducted to verify that the material’s hardness values fall within the acceptable range specified by the ASTM standards and NACE requirements, avoiding risks such as embrittlement.

4. Pitting Corrosion Resistance Test

We performed pitting resistance tests to assess the material’s ability to withstand localized corrosion in chloride-containing environments. F53 displayed excellent pitting resistance, confirming its suitability for offshore and marine applications.

5. Non-Destructive Testing (NDT)

Haihao Group applied multiple non-destructive testing (NDT) methods, including:

Ultrasonic Testing (UT) for internal defect detection.

Dye Penetrant Testing (PT) for surface crack detection. These inspections ensure there are no hidden defects that could compromise safety during service.

6. Positive Material Identification (PMI)

Using spectral analysis (PMI testing), we confirmed the chemical composition of the material, ensuring full compliance with the specified UNS S32750 chemical ranges.

7. Low Temperature Impact Testing (-46°C)

To meet low-temperature service requirements, we conducted Charpy V-notch impact testing at -46°C. The results demonstrated outstanding toughness, ensuring reliable performance even in cryogenic or sub-zero environments.

Through rigorous inspections including dimensional checks, microstructure analysis, hardness testing, pitting resistance assessment, non-destructive testing, PMI verification, and low-temperature impact testing, Haihao Group guarantees the highest quality standards for our MSS SP-97 Weldolet products.

Our commitment to quality ensures that the super duplex MSS SP-97 weldolet fittings not only meet but exceed the stringent demands of critical industries. If you are seeking trusted suppliers for high-quality, NACE-compliant piping components, Haihao Group is your reliable partner for excellence and performance. Email:sales@haihaogroup.com