Loose flange

Loose Flange

LINHUI TITANIUM manufactures premium Loose flange assemblies designed for demanding industrial applications requiring material cost optimization and installation flexibility. Our product systems combine corrosion-resistant stub ends with economical backing flanges, reducing project costs by up to 40% compared to solid alloy alternatives. Available in Carbon Steel grades including ASTM A105, A350 LF2 CL1/CL2, and A694 F60/F65/F70; Alloy Steel such as ASTM A182 F11, F22, F91, 12Cr1MoV, and 15CrMo; plus Stainless Steel options like ASTM A182 F304/304L, F316/316L, and 321. Each assembly meets ASME B16.5 and EN 1092-1 standards with full EN 10204 3.2 traceability certificates.

Key Features & Benefits

Cost-Effective Fabric Optimization

You can indicate high-grade stub closes for liquid contact whereas utilizing temperate backing ribs, accomplishing critical fabric investment funds without compromising erosion resistance.

Rotational Flexibility

The backing rib turns unreservedly around the stub conclusion, disposing of jolt gap arrangement issues amid establishment. This highlight diminishes field welding blunders by 60% in pre-fabricated pipe spools.

Rapid Support Access

Disassembly requires no pipe cutting. You basically unbolt the backing rib whereas the stub conclusion remains welded, cutting upkeep downtime by 50% in water treatment offices.

​​​​​​​Material classification

Carbon Steel: ASTM A105, 20#, Q235, 16Mn, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70;

Alloy Steel: ASTM A182 F1, F5a, F9, F11, F12, F22, F91, A182F12, A182F11, 16MnR, Cr5Mo, 12Cr1MoV, 15CrMo, 12Cr2Mo1, A335P22, St45.8/Ⅲ, 35CrMoV, 45CrMo, etc.

Stainless Steel: ASTM A182 F304, 304L, F316, 316L, 1Cr18Ni9Ti, 0Cr18Ni9Ti, 321, 18-8

Manufacturing standards: national standard, American standard, Russian standard, Japanese standard, German standard, European standard, electrical standard, chemical standard, etc.

Processing method: high-precision CNC lathe turning, ordinary lathe finishing, argon arc welding, etc.

Production process: professional overall forging, forging and pressing, etc. The production process is mainly divided into four types: forging, casting, cutting, and rolling

Stub End Fabrication

We create stub closes through hot shaping or consistent pipe cutting, taken after by arrangement strengthening at 1050°C for stainless grades. This dispenses with carbide precipitation and guarantees uniform erosion resistance.

Backing Rib Forging

Carbon steel backing ribs experience closed-die manufacturing beneath 2500-ton presses, making grain stream arrangement along push lines. Post-forging normalizing at 920°C refines grain structure to ASTM E112 Review 5 or finer.

Surface Treatment

All contact surfaces get accuracy machining to Ra 3.2μm wrap up. Backing ribs are epoxy-coated or hot-dip galvanized per client determinations for expanded benefit life.

Quality Inspection

Dimensional Verification

CMM review affirms levelness inside 0.4mm and jolt gap situating resistance of ±1.5mm per ASME B16.5 requirements.

Material Testing

PMI (Positive Fabric Distinguishing proof) is performed on 100% of stub closes. Mechanical testing incorporates ductile quality confirmation and Charpy V-notch affect testing at -46°C for low-temperature grades.

Non-Destructive Testing

Stub closes experience ultrasonic testing per ASTM A388. Attractive molecule or fluid penetrant assessment identifies surface surrenders surpassing 0.5mm profundity.

Applications

You'll find our assemblies critical in corrosive chemical processing plants where engineers pair Hastelloy stub ends with carbon steel Loose flange backing rings, cutting alloy costs by 40%. Water treatment facilities benefit from rapid disassembly capabilities during valve maintenance without disrupting upstream piping.

In pre-fabricated offshore modules, the rotational feature eliminates field alignment delays. Desalination plants operating under high-chloride conditions use duplex stainless stub ends with epoxy-coated backing flanges for 25-year service life expectancy.

Export Markets

Our items serve clients over North America, European Union, Center East (UAE, Saudi Arabia), and Southeast Asia (Malaysia, Indonesia). We keep up compliance with NACE MR0175 for acrid gas benefit and PED 2014/68/EU for European weight gear directives.

Why Choose Us?

Factory-Direct Pricing

As a producer since 2000, we dispense with wholesaler markups. You get process test certificates and warm traceability specifically from our ISO 9001:2015 certified facility.

Engineering Support

Our metallurgists help with fabric choice based on your prepare conditions—whether acidic pH underneath 3 or temperatures surpassing 450°C.

Flexible Arrange Quantities

Stock orders begin at 100kg. Custom creation suits trial amounts some time recently full generation runs.

Packaging & Shipping

Each gathering gets person polyethylene wrapping with desiccant packs. Backing ribs are stacked on fumigated wooden beds with anti-rust VCI paper interleaving. Stub closes dispatch in plywood cartons with shock-absorbing froth inserts.

Standard conveyance: 15–25 days for standard sizes. Stock things dispatch inside 7 days. We organize Dandy, CIF, or DDP terms through holder or break-bulk shipping.

FAQ

Q: Can the backing flange material differ from the stub end?

A: Yes, that's the primary advantage. You use cost-effective carbon steel backings with exotic alloy stub ends where fluid contact occurs.

Q: What's the maximum temperature rating?

A: Carbon steel assemblies handle up to 400°C. Alloy steel extends to 600°C. Stainless steel reaches 800°C depending on grade and pressure class.

Q: Do you provide custom drilling patterns?

A: Absolutely. We accommodate non-standard bolt patterns and special face finishes per your drawings within 24-hour engineering review.

Q: How does pricing compare to solid flanges?

A: Typically 30–45% lower when using high-alloy stub ends, as you're only paying premium prices for the small contact component.

Request a Quote

Ready to optimize your piping costs without sacrificing quality with Loose flange? Contact our technical team at linhui@lhtitanium.com with your specifications.