ASTM A182 Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service.

This specification covers forged duplex and stainless steel piping components for use in pressure systems. Included are flanges and similar parts to specified dimensions or to dimensional standards, such as the ASME specifications.

ASTM A182 S31803/S32205 is a specification for forged or rolled alloy steel pipe flanges, fittings, valves, and parts designed for high-temperature service. Here’s a breakdown of the specification:

– ASTM A182: This is the standard specification for forged or rolled alloy steel pipe flanges, fittings, valves, and parts.
– S31803: This is the material grade for a duplex stainless steel alloy, which is a combination of austenitic and ferritic stainless steel. It offers high strength, corrosion resistance, and weldability.
– S32205: This is another material grade for a duplex stainless steel alloy, similar to S31803, but with slightly different chemical composition and properties.

The S31803 and S32205 grades are often used in applications that require high strength, corrosion resistance, and weldability, such as in the chemical, oil and gas, and marine industries.

What is an ASTM A182 S31803/S32205 flange?

A flange is a forged or rolled alloy steel ring that is used to connect pipes, valves, and other equipment in a piping system. ASTM A182 S31803/S32205 flanges are specifically designed for high-temperature service and are made from a duplex stainless steel alloy (a combination of austenitic and ferritic stainless steel).

Material:

– Grade: F51 (UNS S31803/S32205)
– Type: Duplex Stainless Steel, S31803 / S32205 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61.
– UNS Number: S31803/S32205

Properties:

– High strength and corrosion resistance
– Good weldability and machinability
– Resistant to pitting, crevice corrosion, and stress corrosion cracking
– Can withstand high temperatures (up to 600°F/315°C)

Types of flanges:

– Slip-on flanges (SO) duplex flanges  in United Kingdom – UK.
– Blind flanges (BL) duplex flanges  in United Kingdom – UK.
– Weld neck flanges (WN) duplex flanges  in United Kingdom – UK.
– Socket weld flanges (SW) duplex flanges  in United Kingdom – UK.
– Lap joint flanges (LJ) duplex flanges  in United Kingdom – UK.
– Threaded flanges (THD) duplex flanges  in United Kingdom – UK.
– Ring Type Joint (RTJ) duplex flanges  in United Kingdom – UK.

Applications:

– Chemical processing
– Oil and gas industry
– Marine and offshore
– Power generation
– High-temperature services

Dimensions and sizes:

– ASME B16.5 and B16.47 Series A and B – Pipe Flanges & Flanged Fittings.
 Available in various sizes (1/2″ to 24″)
– Thickness: 1/4″ to 2″
– Pressure ratings: 150#, 300#, 600#, 900#, 1500# and 2500#

Additional requirements:

– Material test reports (MTRs) are often required
– Flanges may need to be heat-treated or solution-annealed
– Special coatings or linings may be applied for additional corrosion protection