Products Description

S31803 blind flanges are made from duplex steel. UNS S31803 duplex flanges exhibit both ferrite and austenite characteristics in their metallurgical microstructure. S31803 blind flanges have a tensile strength of 620 MPa and a minimum yield strength of 450 MPa. HT PIPE is a leading supplier and manufacturer of UNS S31803 duplex stainless steel blind flanges and other products. We offer various types of duplex flanges, including duplex slip-on flanges, duplex blind flanges, duplex neck weld flanges, duplex socket weld flanges, duplex blind eye flanges, duplex threaded/threaded flanges, duplex reducer flanges, and duplex ring-type joint (RTJ) flanges, for various grades. Our product range is manufactured using high-quality steel and modern equipment. We uphold the quality standards of domestic and international raw materials and offer custom sizes and thicknesses of duplex F51 flanges based on specific customer requirements at market-leading prices.

Production

arbon	0-0.03
Chromium	21.00-23.00
Manganese	≤2.00
Silicon	≤1.00
Phosphorous	0-0.03
Sulphur	0-0.02
Nickel	4.50-6.50
Nitrogen	0.08-0.20
Molybdenum	2.50-3.50
Iron	Balance

Factory Promise

We don't just sell custom S31803 blind flanges; we're committed to building long-term partnerships with wholesale customers, so we're committed to keeping our promises. First, we offer worry-free after-sales service and a quality guarantee.

If any frame component fails due to a manufacturing defect, we'll replace it free of charge. This complies with the EU Construction Products Regulation, giving you peace of mind.

Second, we offer transparent delivery and professional verification.

Third, we provide 24/7 technical support-if your customer's installation team encounters an issue during installation, our team will respond within 3 hours and provide a solution.