Super Duplex ASTM A240 UNS S32750 Spectacle Blind Shipment Completed for Singapore Project

Haihao Group has successfully completed the production and shipment of two ASME B16.48 spectacle blind assemblies for a valued customer in Singapore. Although compact in size, these components were manufactured under stringent technical specifications and underwent comprehensive inspection to satisfy demanding offshore and process industry requirements.

This shipment includes one ASTM A240 UNS S32750 spectacle blind and one ASTM A350 LF2 CL1 spectacle blind, providing the customer with solutions for both highly corrosive service and low-temperature carbon steel piping systems.

Product Overview

Product	Facing	Size	Class	Material	Standard
Spectacle Blind	RF	1/2″	Class 300	ASTM A240 UNS S32750	ASME B16.48
Spectacle Blind	RF	1/2″	Class 150	ASTM A350 LF2 CL1	ASME B16.48

Short Delivery with Strict Quality Control

For both spectacle blinds, the handle was fully welded to ensure structural integrity during operation. The LF2 component received qualified heat treatment to guarantee its mechanical properties, while the Super Duplex S32750 component was manufactured and inspected according to additional metallurgical requirements.

ASTM A240 UNS S32750 Spectacle Blind for Severe Corrosion Service

The highlight of this shipment is the ASTM A240 UNS S32750 spectacle blind, which is designed for aggressive chloride-containing environments commonly found in offshore platforms, seawater systems, desalination plants, and chemical processing facilities.

The supplied Super Duplex material met several important technical requirements, including:

• PREN value ≥ 40.0for outstanding pitting resistance
• Ferrite content controlled between 40% and 60%
• Qualified metallographic structure
• Excellent resistance to localized corrosion
• Reliable mechanical performance at -46°C

Because of its superior combination of strength and corrosion resistance, the ASTM A240 UNS S32750 spectacle blind is widely specified for critical isolation points where long-term reliability is essential.

Comprehensive Inspection and Testing

To ensure complete traceability and project compliance, Haihao Group carried out extensive inspection and testing before shipment.

Inspection Item	Status
Chemical Composition Analysis	Completed
Positive Material Identification (PMI)	Completed
Mechanical Property Test	Completed
Tensile Test	Completed
Hardness Test	Completed
Ferrite Content Measurement	40–60% Qualified
Metallographic Examination	Qualified
Pitting Corrosion Test	Qualified
Charpy Impact Test (-46°C)	Qualified
Heat Treatment Report	Provided
PT & UT Non-Destructive Examination	Completed

Every inspection report accompanied the shipment, including:

• Chemical composition report
• Tensile test report
• Impact test report
• Hardness test report
• PMI report
• Heat treatment report
• PT and UT NDT reports

Reliable Manufacturing for Critical Pipeline Isolation

Spectacle blinds are essential pipeline isolation devices that allow safe switching between flow and shut-off conditions during plant maintenance. Their reliability depends not only on dimensional accuracy but also on material consistency and weld quality.

Whether manufacturing carbon steel, stainless steel, duplex stainless steel, Super Duplex, or nickel alloy products, Haihao Group follows strict international standards to ensure every component is suitable for demanding industrial service.

With extensive experience in ASME B16.48 spectacle blind production, complete in-house inspection capabilities, and fast project execution, Haihao Group continues to supply high-quality pipeline components for customers worldwide.

If your project requires customized ASTM A240 UNS S32750 spectacle blind products or other specialty alloy pipeline fittings, our engineering team is ready to provide professional manufacturing support and complete documentation.