Carbon Steel 20# Blind Flange

QS Flange: CS 20 BL Flange

Forged 20# carbon steel blind flange, 2 inch 600LB with a raised face to ASME B16.5, black anti-rust coated, for closing and isolating line ends.

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One-Minute Overview

Forged 20# carbon steel blind flange that closes the end of a 2 inch line.
600LB class with a raised face, dimensioned to ASME B16.5.
Black anti-rust coating protects the forging on the rack and in service.
Strong stiffness keeps the plate flat, so the joint seals under pressure.

The CS 20# BL flange is a blind flange: a solid forged disc that closes a 2 inch piping joint instead of continuing the run. The material is 20# carbon steel and the body is forged rather than cast, so the plate holds strong stiffness across the full face, which is what keeps a raised-face joint flat and leak-free at 600LB. The bolt circle and drilling follow ASME B16.5, so the blind bolts straight to standard flanges of the same size and class.

Name: CS 20# BL Flange
Size: 2 Inch
Pressure: 600LB
Material: 20#
Flange Face: Raised Face
Process: Forged Steel Flange
Coating: Black Anti-rust Coating
Standard: ASME B16.5

A blind flange does the job of a welded cap, except that it unbolts. That makes it the usual choice at the end of a header, on a branch kept for a later tie-in, and across a valve body while a section is worked on. In pressure vessels, water conservancy works, power stations and general industrial piping the same part serves as a test blank during a hydrostatic test and as the final closure at commissioning.

The coating is an anti-rust treatment on the forging, so the flange arrives clean and stays that way in the warehouse; wipe the gasket seating area dry before bolting up, whatever the part has been through in storage. Fit the gasket called for by the service, bring the bolts up in a star pattern in two or three passes, and check that the gap between the faces stays even as the joint comes down. On a 2 inch 600LB connection that even gap is a better predictor of a dry joint than any amount of extra torque.

FAQ

Q1. What exactly is a BL flange, and where does it sit in the line?

BL stands for blind. The part is a solid forged disc with a bolt circle but no bore, so it closes a 2 inch joint instead of letting flow pass. It sits at a header end, on a spare branch, or across a valve during maintenance, and it is dimensioned to ASME B16.5 like every other flange in its class.

Q2. Can I drop a 600LB blind onto any 2 inch line?

Only if the line itself is built for Class 600. The 600LB figure comes from ASME B16.5 and describes what the flange will take; it says nothing about your pipe or the rest of the joint. Check the line class on the isometric first, then bolt the blind to flanges of the same size, class and face finish.

Q3. Does the coating actually matter on a steel part?

It does, and for a dull reason: a blind often waits months on a rack before anyone fits it. 20# carbon steel starts to rust as soon as the machined surface meets damp air, and a rusted seating area is a leak looking for a shift. The black anti-rust coating buys that waiting time. Clean the seating band before bolting up.

Q4. What is the smallest order I can place?

Standard flange insulation gasket kits start at one set, and standard gaskets, studs, washers and sleeves start at one piece. Parts made to your drawing or to a non-standard bolt pattern are quoted one by one, because the minimum really depends on the material and the tooling involved.

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