ASME B16.47 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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ASME B16.47 Large Diameter Flanges — NPS 26 to 60

ASME B16.47 covers large diameter steel flanges from NPS 26 through NPS 60 in pressure classes 75, 150, 300, 400, 600 and 900. It is divided into Series A (equivalent to MSS SP-44, used in API refinery/pipeline service) and Series B (equivalent to API 605, used in ASME pressure vessel connections). Duplex and super duplex flanges to B16.47 are manufactured for large-bore offshore manifolds, storage tank nozzles, pipeline pig traps and FPSO hull connections.

Ragnar Metals supplies B16.47 flanges in weld neck and blind types. Material certification to ASTM A182 F51 (S31803) or F53 (S32750) with full ultrasonic testing (UT) per ASTM A388 and PMI (positive material identification) per ASTM E1476. Lead time 4–8 weeks from Mumbai mill; export to offshore projects in the North Sea, Persian Gulf and APAC region.

ASME B16.47 Large Bore Duplex Flange Standards (NPS 26–60)

ASME B16.47 covers large diameter flanges in NPS 26 through NPS 60, divided into two series: Series A (formerly MSS SP-44, heavier wall, used in pipeline service) and Series B (formerly API 605, lighter wall, used in process plant service). Duplex stainless steel ASME B16.47 flanges are available in both series to ASTM A182 F51 (S31803) and F53 (S32750) material, with pressure classes 75, 150, 300, 400, 600, and 900. Large bore duplex flanges are typically used in seawater lift pumps, large bore risers, and bulk process piping on FPSOs and refineries.

Series	NPS Range	Pressure Classes	Origin Standard	Key Application
Series A	NPS 26–60	75, 150, 300, 400, 600, 900	MSS SP-44	Pipeline valve flanges, pig launcher/receiver
Series B	NPS 26–60	75, 150, 300, 400, 600, 900	API 605	Process plant equipment flanges, large bore columns

B16.47 Duplex Flange Applications

• Seawater lift pump suction and discharge flanges (NPS 26–48) on offshore platforms
• Gas compression station inlet separator and scrubber nozzle flanges
• Crude oil storage tank outlet manifold flanges in export terminals
• Large bore pipeline valve end flanges in sub-sea tie-back systems
• FPSO turret mooring swivel stack large bore interface flanges

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 B16.47 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)	Welded structures, chemical processing
904L	20% Cr, 25% Ni, 4.5% Mo, Cu	Severe corrosion environments
317L	18% Cr, 13% Ni, 3% Mo (low carbon)	Pharmaceuticals, food processing
Super Duplex S32750	25% Cr, 7% Ni, 4% Mo, N	Offshore oil & gas, chemical processing
Super Duplex S32760	26% Cr, 8% Ni, 4% Mo, N	Severe corrosive environments

Specifications Table

Material	ASME B16.47 Duplex Flange Exporter
Grades	2205, 2507, 316L, 317L, S32750, S32760
Standard	ASTM A240 / A182 / A193 / A312
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)	2.0 max	1.0 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)	3.0–4.0	4.0–5.0

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 B16.47 Duplex Flange Exporter Price List (2025)

Material Grade	Thickness	Price (USD / Kg)	Price (INR / Kg)
2205 (Duplex)	3 mm	$4.00 – $4.70	₹310 – ₹380
2507 (Super Duplex)	6 mm	$4.50 – $5.20	₹350 – ₹430
2205 (Duplex)	10 mm	$4.80 – $5.60	₹370 – ₹450
2507 (Super Duplex)	10 mm	$5.00 – $6.00	₹390 – ₹470

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 B16.47 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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