Carbon Steel Q345B Blind Flange

QS Flange: CS Q345B BL Flange

Forged Q345B steel blind flange, 2 inch 600LB, raised face to ASME B16.5, black anti-rust coated, for pressure vessel and plant piping.

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One-Minute Overview

Forged Q345B steel blind flange closing a 2 inch 600LB flange joint.
Raised face machined to ASME B16.5, so it bolts to standard flanges.
Black anti-rust coating on the body, cleaned seating band for the gasket.
Strong stiffness and good sealing for plant and vessel piping.

The CS Q345B BL flange closes a 2 inch joint with a solid forged disc in Q345B steel, the grade named on the product page. The body is forged, so the finished part carries strong stiffness across the plate, and the raised face is machined to ASME B16.5 for a standard bolt circle. At 600LB the joint belongs to the higher pressure bands of plant piping, where a plate that stays flat under bolt load is the difference between a dry flange and a weep.

Name: CS Q345B BL Flange
Size: 2 Inch
Pressure: 600LB
Material: Q345B
Flange Face: Raised Face
Process: Forged Steel Flange
Coating: Black Anti-rust Coating
Standard: ASME B16.5

Blind flanges earn their place wherever flow has to stop but the connection has to stay. Vessel and exchanger nozzles, spare branches kept for a later tie-in, pump and header connections opened at a turnaround, and the boundary of a hydrostatic test pack are the four usual ones, and a 2 inch 600LB blind fits all four. The Q345B body is forged in one piece, so the disc has no weld and no seam to inspect before every shutdown, and the bolt circle and drilling follow ASME B16.5 so the part fits the flanges already on the line.

The raised face presents the same sealing band as the rest of the joint, which means the gasket sees a defined area rather than the full plate. Keep that band clean and dry, fit the gasket listed for the service, and pull the bolts down in a star pattern in stages rather than in one pass. If the blind has been in store for a while, check it for dents on the seating band before it goes in; a 2 inch disc is light enough to handle alone and heavy enough to be dropped.

FAQ

Q1. Where does a 600LB blind actually get used?

Four places, mostly: vessel and exchanger nozzles, spare branches kept for a later tie-in, pump and header connections opened at a turnaround, and the boundary of a hydrostatic test pack. In all four the joint stays bolted while the flow is stopped, so the blind does a valve's work with no seat to leak and nothing to operate.

Q2. Does the Q345B body change how I install it?

Not the method, only the handling. The body is forged in one piece, so there is no weld or seam to inspect before each shutdown, and the plate stays flat while the bolts come down. The bolt circle and drilling follow ASME B16.5, so the sequence is the same as for any other flange of this size and class.

Q3. Can the same blind go back in after a shutdown?

Yes, if it comes out straight and clean. Inspect the raised face for dents, corrosion and gasket residue, and check the plate for distortion before it goes back between the flanges. A blind that has been over-torqued on one side may never sit flat again. Replace the gasket every time; the steel usually outlives several of them.

Q4. How long will production take?

Standard sizes are typically ready within 30 days, and in-stock items ship immediately. Larger or custom orders get a confirmed date per order, because the schedule depends on quantity, material, the bolt pattern you specify, and how busy production is at the moment you order.

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