ASME SA182 Duplex Flange Exporter Manufacturer, Supplier & Exporter | Ragnar Metals & Tubes

• Direct manufacturer — Competitive mill prices
• ISO & third-party inspected — EN 10204 MTCs
• Export-ready packaging and global logistics

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ASTM A182 / ASME SA-182 Forged Duplex Flanges — Grade F51 (UNS S31803)

ASTM A182 (ASME SA-182) covers forged or rolled alloy and stainless steel pipe flanges, fittings and valves for high-temperature service. For duplex and super duplex grades, the standard specifies grade F51 (UNS S31803) — a two-phase austenitic-ferritic stainless with approximately 50% each phase. This microstructure gives twice the yield strength of 316L alongside excellent resistance to stress corrosion cracking (SCC) in chloride environments.

Ragnar Metals manufactures A182 flanges to ASME B16.5 (NPS ½–24) and B16.47 (NPS 26–60) dimensional standards. All forgings are solution annealed, water quenched and tested per heat. Ferrite content measured by Fisher Feritscope to confirm 35–65% ferrite range.

ASTM A182 / Duplex & Super Duplex Flange Grades

ASTM A182 (and its ASME equivalent SA182) covers forged or rolled alloy and stainless steel pipe flanges, forged fittings, and valves for high-temperature service. For duplex and super duplex stainless steel flanges, the key grades under A182 are F51 (UNS S31803), F60 (UNS S32205), and F53 (UNS S32750) — each offering a defined minimum PREN (Pitting Resistance Equivalent Number) and hardness limit of HRC 32 max. All A182 flanges supplied by Ragnar Metals and Tubes undergo liquid penetrant or magnetic particle testing on the bore and face, with full material traceability via EN 10204 3.1 MTCs.

ASTM A182 Grade	UNS Number	Min Yield (ksi)	Min Tensile (ksi)	Hardness (max)	PREN (min)
F51	S31803	65	90	HRC 32	34
F60	S32205	65	90	HRC 32	35
F53	S32750	80	116	HRC 32	42
F55	S32760	80	116	HRC 32	40

A182 Flange Applications

• Offshore oil and gas wellhead and Christmas tree assemblies
• Subsea pipeline end terminations (PLETs) requiring NACE MR0175 sour service
• Seawater cooling and ballast systems on FPSOs and semi-submersibles
• Chemical plant piping carrying chloride-bearing process fluids
• Desalination plant high-pressure feed trains

About Ragnar Metals & Tubes

Ragnar Metals & Tubes is a trusted manufacturer, supplier, and global exporter of high-performance metal products including fasteners, fittings, pipes, tubes, flanges, and custom-engineered components. With a strong export presence in USA, UK, Germany, UAE, Saudi Arabia, Canada, Australia, and 50+ countries, we are known for delivering precision-engineered solutions for critical and high-temperature industrial applications.

Our manufacturing facility follows strict quality control systems with ISO 9001, ISO 14001, and ISO 45001 certification. Every product is tested and supplied with EN 10204 3.1 / 3.2 Material Test Certificates, ensuring complete material traceability and compliance with international standards such as ASTM, ASME, DIN, EN, and BS.

We cater to bulk industrial buyers, EPC contractors, and engineering projects across oil & gas, petrochemical, marine, power generation, aerospace, offshore drilling, and heavy engineering sectors. With flexible manufacturing, custom dimensions, and fast global delivery, we ensure reliable, consistent, and timely supply for all project requirements.

Why Choose Ragnar Metals & Tubes

• 50+ Countries served
• 24/7 RFQ Support
• Fastest delivery
• Direct manufacturer with bulk stock and fast lead times
• ISO 9001 certified production and documented QA
• Global shipping with export-grade packaging
• EN 10204 3.1 / 3.2 MTCs, third-party inspection on request
• Global export experience to USA, UK, EU, MENA & APAC
• Custom sizes and drawing-based manufacturing
• Faster quotations — send quantity, grade and dimensions
• Bulk quantity available at factory price
• 100% traceability with heat number stamping

Testing & Quality Inspection Process

At Ragnar Metals & Tubes, our testing process is designed to ensure the reliability, durability, and performance of every product we manufacture—including Pipes & Tubes, Fittings, Flanges, Sheets & Plates, Fasteners, and Rods & Bars. All testing follows internationally recognized standards such as ASTM, ASME, ISO, EN, and DIN.

Each batch undergoes multiple inspection stages starting from raw material verification to final dispatch. Our advanced laboratories perform chemical, mechanical, and non-destructive tests to ensure full compliance and traceability.

Types of Tests Performed

Ultrasonic Testing (UT)

Detects internal defects using high-frequency sound waves without damaging the material.

Hardness Testing

Checks resistance to deformation to ensure materials meet mechanical strength requirements.

Surface Finish Inspection

Examines surface quality, cracks, and finishing accuracy for high-precision applications.

Impact Test (Charpy V-Notch)

Measures impact resistance and toughness under varying temperature conditions.

Heat Treatment Report

Ensures optimal mechanical properties through controlled heating and cooling processes.

Tensile Test

Evaluates tensile strength, yield strength, and elongation to verify compliance with standards.

Quality Documentation & Traceability

Every batch is certified and supported with complete documentation including EN 10204 3.1 / 3.2 Material Test Certificates (MTC), heat number traceability, and third-party inspection reports (SGS, TUV, BV, Lloyds) upon request.

Our testing technicians are trained to follow strict procedures, ensuring that Ragnar Metals & Tubes maintains its reputation as a reliable global supplier trusted across the Oil & Gas, Petrochemical, Marine, Power, and Heavy Engineering industries.

Available Grades Table

ASME SA182 Duplex Flange Exporter	Composition	Applications
2205 (Duplex)	22% Cr, 5% Ni, 3% Mo	Oil & gas, marine applications
2507 (Super Duplex)	25% Cr, 7% Ni, 4% Mo	Aggressive chloride environments
316L	16% Cr, 10% Ni, 2% Mo (low carbon)	Medical implants, welded structures
904L	20% Cr, 25% Ni, 4.5% Mo, Cu	Severe corrosion environments
304L	18% Cr, 8% Ni (low carbon)	Welded components, chemical industry
347	18% Cr, 10% Ni, Nb	Welded pressure vessels
316	16% Cr, 10% Ni, 2% Mo	Marine, chemical processing
321	18% Cr, 9% Ni, Ti	High-temperature services

Specifications Table

Material	ASME SA182 Duplex Flange Exporter
Grades	2205, 2507, 316L, 904L, 304L, 347, etc.
Standard	ASTM A312 / A213 / A269 / A358
Size Range	1/2" NB to 24" NB (Seamless), 1/2" NB to 100" NB (Welded)
Length	Single Random, Double Random & Custom Cut
Form	Round, Square, Rectangular

Chemical Properties Table

Element	2205 (%)	2507 (%)
Carbon (C)	0.03 max	0.03 max
Chromium (Cr)	22.0–23.0	25.0–26.0
Nickel (Ni)	4.5–6.5	6.0–8.0
Manganese (Mn)	1.5 max	1.5 max
Silicon (Si)	1.0 max	1.0 max
Phosphorus (P)	0.03 max	0.03 max
Sulfur (S)	0.02 max	0.02 max
Molybdenum (Mo)	3.0–5.0	3.0–5.0

Mechanical Properties Table

Property	2205	2507
Tensile Strength (MPa)	620 min	750 min
Yield Strength (MPa)	450 min	550 min
Elongation (%)	25 min	20 min
Hardness (HRB)	95 max	98 max

ASME SA182 Duplex Flange Exporter Price List (2025)

Material Grade	Thickness	Price (USD / Kg)	Price (INR / Kg)
2205 (Duplex)	3 mm	$3.60 – $4.10	₹280 – ₹340
2507 (Super Duplex)	6 mm	$4.00 – $4.80	₹320 – ₹400
2205 (Duplex)	10 mm	$4.40 – $5.20	₹350 – ₹420

Note: The above prices are for reference only. Actual pricing may vary based on size, thickness, quantity, raw material cost, and delivery location. Contact us to get the best and most updated pricing for ASME SA182 Duplex Flange Exporter.

Lead Time

2–7 weeks depending on size

Delivery Terms

FOB, CIF, DDP

Shipping Modes

Sea / Air / Express

Export Packaging & Shipping

• Sea-worthy fumigated wooden crates with waterproof lining
• Palletised boxing with clear shipping marks & heat number labels
• Container stuffing supervision and loading photos on request

MOQ & Payment Terms

Minimum Order Quantity: 25–100 Kg depending on part size and grade.

Payment Terms: Depending On Grade and Quantity Size

Applications & Uses

• Oil & Gas Industry
• Petrochemical Plants
• Water Treatment Plants
• Pharmaceutical Industry
• Food & Beverage Industry
• Automobile Industry

Cities We Suppllied In India

We exported to 50+ countries worldwide.

Frequently Asked Questions

Do you provide Material Test Certificates?

Yes, we provide EN 10204 3.1 / 3.2 Material Test Certificates with complete chemical and mechanical analysis for every shipment.

What is the Minimum Order Quantity (MOQ)?

MOQ generally ranges between 25–100 Kg depending on product size, grade and specifications.

Do you export to USA, Europe and UAE?

Yes, we ship worldwide including USA, UK, Germany, UAE, Saudi Arabia, Canada and Australia.

What are your payment terms?

Typical payment terms are 30% advance and 70% against copy of shipping documents. Payments via T/T, LC and SWIFT are accepted.

What packaging do you use for export?

All products are packed in sea-worthy fumigated wooden boxes with waterproof lamination, pallet loading and shipment marking for traceability.

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