Stainless Steel Blind Flange

QS Flange: Blind Flange China Suppliers

Forged stainless steel BL blind flange, 1/2 to 24 inch, Class 150-2500LB, RF, per ANSI B16.5 for permanent or temporary end sealing.

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One-Minute Overview

Forged BL blind flange that seals the end of a line, permanently or temporarily.
Chromium-nickel stainless steel resists pitting, crevice and stress corrosion cracking.
ANSI B16.5, sizes 1/2 to 24 inch, classes 150 to 2500LB, RF face.
Stable from cryogenic conditions up to 800°C, including steam headers and reformer lines.

When pipeline integrity demands absolute closure, the stainless steel blind flange is a first-line component for permanent or temporary end sealing. The forged BL type with raised face remains a practical, reliable and cost-effective choice, combining material traceability with rigorous dimensional control for refineries, offshore platforms and chemical plants.

Name: Stainless Steel Blind Flange
Size: 1/2"-24"
Pressure: Class 150 - Class 2500
Type: BL
Flange Face: RF
Material: Stainless Steel
Standard: ANSI B16.5
Process Method: Forged

Forging refines the grain structure, eliminates porosity and delivers superior mechanical strength compared with cast alternatives. The chromium-nickel alloy content provides outstanding resistance to pitting, crevice corrosion and stress corrosion cracking — essential for sour gas, seawater cooling and food-grade steam lines. The RF sealing surface ensures tight joint compression when mated with corresponding gaskets, reducing leak paths under fluctuating thermal and pressure cycles.

Performance stays stable across extreme temperatures. Through solution annealing and controlled forging, the flange retains oxidation resistance and creep strength from cryogenic conditions up to 800°C, which suits superheated steam headers, reformer outlet lines and heat-exchanger channels where thermal shock is routine. The hub-less design limits distortion and gasket relaxation during rapid start-ups or shutdowns, and the fully recyclable material carries no hazardous coatings. For offshore or coastal installations, it significantly outlasts carbon steel equivalents and lowers life-cycle maintenance costs.

Typical uses include blocking pig launcher and receiver ends, temporarily sealing wellhead flow lines, and providing sanitary dead-end closures with easy cleaning access in food and pharmaceutical plants.

FAQ

Q1. What sizes and classes does this blind flange cover?

The range covers 1/2 to 24 inch and Class 150 through 2500LB, all dimensioned to ANSI B16.5 with a raised face. That span covers the full spectrum of petrochemical, power generation and marine applications, and every blind mates with standard gaskets and bolting of the adjoining class.

Q2. Why is a forged blind better than a cast one?

The forging process refines the grain structure and eliminates porosity, so the part carries superior mechanical strength compared with cast alternatives. For a pressure-boundary closure you get tougher material, tighter dimensional control and a surface that stands up to fluctuating thermal and pressure cycles.

Q3. Will it survive sour gas, seawater and high temperature?

Yes — the chromium-nickel alloy resists pitting, crevice corrosion and stress corrosion cracking in sour gas and seawater cooling, and solution annealing keeps oxidation resistance and creep strength stable up to 800°C. Offshore and coastal installations typically see far longer service than carbon steel equivalents.

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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