Product Overview
Duplex Steel Buttweld Fitting Stockist & Supplier in India
Duplex steel butt-weld fittings are engineered for piping systems that require a
combination of high mechanical strength and strong resistance to corrosion,
particularly in chloride-containing and aggressive process environments. As a
reliable Duplex Steel Buttweld Fitting Stockist in India and Duplex Steel
Buttweld Fitting Supplier in India, Metal-Link Steel & Alloys supplies a
comprehensive range of elbows, tees, reducers, caps, and other butt-weld
fittings in standard duplex and super duplex stainless steel grades.
A Duplex Steel Buttweld Fitting has a mixed austenitic-ferritic microstructure
that provides higher strength than many conventional austenitic stainless steels
while maintaining good corrosion resistance. These fittings are commonly used in
offshore, marine, oil and gas, chemical processing, desalination, and other
demanding piping applications.
With an established presence since 1985 and ISO 9001:2015, ISO 14001:2015 and
ISO 45001:2018 certifications, Metal-Link supports duplex steel buttweld fitting
requirements with material traceability, inspection documentation and
project-based supply.
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Factory Rates →
Datasheet
Duplex Steel Buttweld Fitting Specifications
| Specification |
Details |
| Product |
Duplex Steel Buttweld Fittings |
| Material Grades |
UNS S31803, UNS S32205, UNS S32750, UNS S32760 |
| Material Specification |
ASTM A815 / ASME SA815 |
| Standards |
ASME B16.9, ASME B16.28, MSS SP-43 |
| Types Available |
Elbows (45° & 90°, LR & SR), Tees,
Reducing Tees, Crosses, Concentric Reducers, Eccentric
Reducers, Caps, Stub Ends |
| End Connection |
Butt Weld (Beveled Ends) |
| Product Form |
Wrought / Formed & Solution Annealed |
| Application |
Offshore, Marine, Chemical Processing & Aggressive
Industrial Piping Systems |
Product Range
Types of Duplex Steel Buttweld Fittings
As an experienced Duplex Steel Buttweld Fitting Supplier in India, Metal-Link
supplies fittings for changing pipeline direction, creating branch connections,
reducing pipe diameter, and terminating piping systems. Our product range
includes:
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✓
Duplex Steel Buttweld Elbows
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✓
Duplex Steel Buttweld Tees
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✓
Duplex Steel Reducing Tees
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✓
Duplex Steel Buttweld Crosses
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✓
Duplex Steel Concentric Reducers
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✓
Duplex Steel Eccentric Reducers
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✓
Duplex Steel Buttweld Caps
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✓
Duplex Steel Stub Ends
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✓
Duplex Steel Long Radius Elbows
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✓
Duplex Steel Short Radius Elbows
Types of Duplex Steel Buttweld Elbows
45 Degree ElbowsUsed where a
moderate change in pipeline direction is required. Its gradual geometry
supports smoother flow and is commonly selected according to piping
layout and process requirements.
90 Degree ElbowsOne of the
most commonly used Duplex Steel Buttweld Fittings for changing pipeline
direction by ninety degrees. Available in different radius
configurations depending on system design and space
requirements.
Long Radius ElbowsProvide a
more gradual directional change and are generally preferred where lower
pressure loss and smoother flow characteristics are important design
considerations.
Short Radius ElbowsDesigned
for installations where space limitations require a more compact fitting
geometry. Their tighter bend radius should be considered when evaluating
flow resistance and piping stresses.
Duplex Steel Buttweld Reducers
Concentric ReducersProvide a
symmetrical transition between different pipe sizes. Commonly used where
maintaining a common pipe centerline is important, particularly in
vertical piping systems and applications requiring a balanced flow
transition.
Eccentric ReducersHave an
offset centerline and are generally used in horizontal piping systems.
Proper orientation helps avoid the accumulation of gas or liquid,
particularly important in pump suction and process piping
applications.
Duplex Steel Buttweld Tees & Crosses
Duplex steel tees are used to create branch connections in piping systems. Equal
tees connect pipes of the same nominal diameter, while reducing tees provide a
branch connection of a different size.
Duplex steel crosses provide four connection points and may be used where the
piping layout requires multiple branch directions. The final selection should
consider pressure, stress, flow conditions, and the applicable piping
code.
Material Grades
Duplex Steel Buttweld Fitting Grades Available
| Material Grade |
UNS Designation |
Typical Service Characteristics |
| Duplex 2205 |
S31803 / S32205 |
High strength and chloride corrosion resistance |
| Super Duplex 2507 |
S32750 |
Severe chloride and seawater environments |
| Super Duplex |
S32760 |
Offshore and highly corrosive service |
Duplex Steel UNS S31803 Buttweld Fittings
UNS S31803 is a duplex stainless steel grade containing chromium, nickel,
molybdenum, and nitrogen. Its duplex microstructure provides a useful balance
of strength, toughness, and corrosion resistance.
- ✓Good resistance to
chloride stress corrosion cracking
- ✓Higher strength than
common austenitic stainless steels
- ✓Good resistance to
pitting and crevice corrosion
- ✓Suitable for pressure
piping and process systems
UNS S31803 Duplex Steel Buttweld Fittings are commonly used in chemical
processing, oil and gas production, marine systems, and chloride-containing
process environments.
Duplex Steel UNS S32205 Buttweld Fittings
UNS S32205 is a widely used modern duplex stainless steel with controlled
composition requirements that provide consistent corrosion resistance and
mechanical performance. It is commonly associated with the designation Duplex
2205. The grade offers improved resistance to localized corrosion compared with
standard austenitic stainless steels and provides approximately double the yield
strength of common grades such as 304 and 316 in many product forms.
- ✓Excellent resistance to
chloride stress corrosion cracking
- ✓High yield
strength
- ✓Good resistance to
pitting and crevice corrosion
- ✓Suitable for demanding
process environments
- ✓Good fatigue
performance
UNS S32205 Duplex Steel Buttweld Fittings are widely used in offshore platforms,
oil and gas processing, chemical plants, desalination facilities, and marine
piping systems.
Super Duplex Steel UNS S32750 Buttweld Fittings
UNS S32750 is a super duplex stainless steel developed for highly aggressive
chloride-containing environments. Its higher chromium, molybdenum, and nitrogen
content provides significantly improved resistance to localized corrosion.
- ✓Excellent pitting
resistance
- ✓Strong resistance to
crevice corrosion
- ✓High mechanical
strength
- ✓Excellent resistance to
chloride stress corrosion cracking
- ✓Suitable for seawater
and offshore environments
UNS S32750 fittings are commonly used in subsea systems, offshore oil and gas
production, seawater handling, desalination, and chemical processing
applications.
Super Duplex Steel UNS S32760 Buttweld Fittings
UNS S32760 is another super duplex stainless steel grade designed for highly
demanding corrosive environments. The grade combines high chromium, molybdenum,
and nitrogen content with alloying additions that support corrosion resistance
and mechanical strength.
- ✓Excellent resistance to
seawater corrosion
- ✓High
strength
- ✓Good resistance to
pitting and crevice attack
- ✓Suitable for severe
chloride environments
- ✓Reliable performance in
offshore applications
UNS S32760 Duplex Steel Buttweld Fittings are used in offshore production
systems, marine engineering, seawater equipment, chemical processing, and other
aggressive industrial services.
Design Data
Standards & Specifications
As a professional Duplex Steel Buttweld Fitting Stockist in India, Metal-Link
supplies fittings according to applicable international material and dimensional
standards.
| Standard |
Scope |
| ASME B16.9 |
Factory-made wrought steel butt-welding fittings |
| ASME B16.28 |
Wrought steel butt-welding short radius elbows and
returns |
| ASTM A815 / ASME SA815 |
Wrought ferritic, ferritic-austenitic, and martensitic
stainless steel piping fittings |
| MSS SP-43 |
Wrought and fabricated butt-welding fittings for
low-pressure corrosion-resistant applications |
| ASTM A790 |
Related duplex stainless steel seamless and welded
pipe |
| ASTM A789 |
Duplex stainless steel tubing |
| EN / DIN / BS |
Alternative dimensional and material standards as
required |
Material Data
Composition, Manufacturing & Performance
Chemical Composition & Duplex Microstructure
The properties of a Duplex Steel Buttweld Fitting result from both its chemical
composition and its controlled balance of austenite and ferrite.
| Alloying Element |
Primary Contribution |
| Chromium |
Improves general and localized corrosion
resistance |
| Nickel |
Supports austenite formation and toughness |
| Molybdenum |
Improves resistance to pitting and crevice
corrosion |
| Nitrogen |
Increases strength and localized corrosion
resistance |
| Iron |
Forms the primary metallic base |
| Manganese |
Supports metallurgical balance in selected
grades |
The balance between ferrite and austenite is important because excessive amounts
of undesirable intermetallic phases can reduce corrosion resistance and
toughness.
Manufacturing Process
Duplex steel butt-weld fittings require carefully controlled manufacturing
because excessive heat exposure can affect the duplex phase balance and
corrosion performance. The manufacturing process may include:
- ✓Selection of certified duplex
or super duplex starting material
- ✓Cutting and preparation of
pipe, plate, or other approved raw material
- ✓Controlled hot or cold
forming
- ✓Solution annealing where
required by the applicable specification
- ✓Rapid cooling to maintain the
required microstructure
- ✓End bevel preparation for
welding
- ✓Surface cleaning and
finishing
- ✓Dimensional
inspection
- ✓Material and mechanical
testing
- ✓Final marking and
documentation
Temperature control during forming and heat treatment is particularly important
to minimize the formation of detrimental phases that may reduce toughness or
corrosion resistance.
Mechanical & Corrosion Performance
A Duplex Steel Buttweld Fitting offers an important combination of high
mechanical strength and corrosion resistance. Major performance characteristics
include:
- ✓Higher yield strength
than many austenitic stainless steel
grades
- ✓Good resistance to
chloride stress corrosion cracking
- ✓Strong resistance to
pitting corrosion
- ✓Good resistance to
crevice corrosion
- ✓Good fatigue
performance
- ✓Reliable performance in
aggressive process environments
Super duplex grades such as UNS S32750 and UNS S32760 are generally selected for
more severe chloride and seawater environments than standard Duplex 2205.
Welding & Fabrication Considerations
Duplex steel butt-weld fittings require controlled welding practices to preserve
the desired ferrite-austenite balance and corrosion resistance of the welded
joint. Important considerations include:
- ✓Qualified welding procedures
specifically suitable for duplex materials
- ✓Compatible filler metal
selection
- ✓Controlled heat
input
- ✓Appropriate interpass
temperature
- ✓Proper joint
cleaning
- ✓Avoidance of excessive heat
exposure
- ✓Prevention of carbon steel
contamination
- ✓Post-weld cleaning and
passivation where required
Fabrication procedures should be developed according to the selected duplex
grade, service environment, and applicable project requirements.
Industry Use
Applications of Duplex Steel Buttweld Fittings
Duplex and super duplex butt-weld fittings are widely used in systems where
conventional stainless steel may not provide sufficient strength or resistance
to chloride-induced corrosion.
- ✓Offshore Oil & Gas
Platforms:
Topside and
subsea piping systems requiring high strength and resistance to
seawater and chloride-containing process
fluids.
- ✓Subsea Piping
Systems:
Subsea pipelines and
equipment requiring super duplex grades such as UNS S32750 and
UNS S32760 for severe seawater service.
- ✓Petrochemical
Processing:
Process piping in
petrochemical plants handling chloride-containing and aggressive
process fluids.
- ✓Chemical Processing
Plants:
Piping systems
handling acids, chlorides, and other aggressive chemicals requiring
duplex stainless steel corrosion resistance.
- ✓Seawater Handling
Systems:
Seawater injection,
cooling, and utility piping using duplex and super duplex grades
for reliable corrosion resistance.
- ✓Desalination
Plants:
High-pressure and
corrosive process piping in reverse osmosis and thermal
desalination systems.
- ✓Marine
Engineering:
Marine and
offshore structural piping exposed to seawater and marine
atmospheres requiring corrosion-resistant alloy
fittings.
- ✓Oil & Gas
Production:
Production
manifolds, injection systems, and process piping requiring duplex
stainless steel strength and corrosion
resistance.
- ✓Pulp & Paper
Industries:
Process piping
handling chloride-containing bleaching and process fluids requiring
duplex stainless steel fittings.
- ✓Firewater Systems Using
Seawater:
Offshore and
coastal firewater distribution systems using seawater and requiring
duplex alloy fittings for corrosion
resistance.
- ✓Heat Exchanger
Systems:
Connecting piping
and headers in heat exchanger installations handling aggressive
process or cooling media.
Certification
Testing, Inspection & Quality of Duplex Steel Buttweld Fittings
As a dependable Duplex Steel Buttweld Fitting Supplier in India, Metal-Link Steel
& Alloys can supply products with testing and inspection according to
applicable standards and project specifications. Available testing may
include:
- ✓Chemical composition
analysis
- ✓Tensile testing
- ✓Hardness testing
- ✓Impact testing where
specified
- ✓Positive Material
Identification (PMI)
- ✓Ferrite content
measurement
- ✓Ultrasonic
testing
- ✓Liquid penetrant
testing
- ✓Radiographic testing where
applicable
- ✓Dimensional
inspection
- ✓Wall thickness
measurement
- ✓Visual examination
With an established presence since 1985 and ISO 9001:2015, ISO 14001:2015 and
ISO 45001:2018 certifications, Metal-Link supports consistent product quality.
Documentation can include Material Test Certificates, PMI reports, ferrite
measurement reports, NDT reports, dimensional inspection reports, and
third-party inspection certificates.
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Certificate →
Pan-India Supply
Duplex Steel Buttweld Fitting Supplier & Stockist Across India
Metal-Link Steel & Alloys supplies Duplex Steel Buttweld Fittings to EPC
contractors, engineering companies, offshore operators, process plants,
fabricators, distributors and industrial buyers across major Indian markets. As
a Duplex Steel Buttweld Fitting Supplier in India, Metal-Link supports standard
and project-specific requirements based on grade, size, schedule, and
quantity.
Cities We Supply
MumbaiPuneAhmedabadVadodaraSurat
DelhiGurugramNoidaChennaiBengaluru
HyderabadKolkataJaipurRajkotCoimbatore
VisakhapatnamNagpurIndore
Have Questions?
Frequently Asked Questions
What grades of duplex steel buttweld fittings do you
supply?
Metal-Link supplies Duplex Steel Buttweld Fittings in
UNS S31803, UNS S32205, UNS S32750, and UNS S32760 grades, subject to the
required specification and availability.
What is the difference between Duplex 2205 and Super Duplex 2507
fittings?
Duplex 2205 (UNS S31803 / S32205) is a standard
duplex stainless steel suitable for demanding chloride-containing
environments. Super Duplex 2507 (UNS S32750) has a higher chromium,
molybdenum, and nitrogen content, providing significantly improved
resistance to pitting, crevice corrosion, and chloride stress corrosion
cracking for more severe service conditions such as seawater and subsea
applications.
What is the difference between UNS S32750 and UNS S32760 super duplex
fittings?
Both UNS S32750 and UNS S32760 are super duplex
stainless steel grades with similar corrosion resistance and mechanical
properties. UNS S32760 contains additional alloying elements including
copper and tungsten that provide comparable or enhanced resistance in
certain aggressive environments. The choice between them may depend on
project specification, availability, and specific service
requirements.
What standards are used for duplex steel buttweld
fittings?
Common standards include ASME B16.9 for
factory-made wrought butt-welding fittings, ASME B16.28 for short-radius
elbows, ASTM A815 / ASME SA815 for wrought ferritic-austenitic stainless
steel fittings, and MSS SP-43 for low-pressure corrosion-resistant
applications. EN, DIN and BS standards can also be referenced as
required.
Why is ferrite content measurement important for duplex steel
fittings?
Ferrite content measurement verifies that the duplex
microstructure has maintained the correct balance between ferrite and
austenite after forming and heat treatment. An incorrect phase balance can
result from excessive heat exposure or improper cooling and may reduce
corrosion resistance, toughness, and mechanical performance. Ferrite
measurement is therefore an important part of quality verification for
duplex stainless steel fittings.
Can you supply material test certificates with duplex steel buttweld
fittings?
Yes. Duplex Steel Buttweld Fittings can be supplied
with applicable Material Test Certificates (MTCs), chemical analysis,
mechanical test results, ferrite measurement reports, PMI reports, NDT
reports, dimensional inspection reports, and third-party inspection
documentation as required by the project specification.
Request a Quote
Request a Quote for Duplex Steel Buttweld Fittings
Looking for a Duplex Steel Buttweld Fitting Stockist in India for
your offshore, marine, desalination, chemical processing, or oil and
gas piping requirements? Contact Metal-Link Steel & Alloys with
your required fitting type, material grade, nominal pipe size,
schedule or wall thickness, dimensional standard, quantity, operating
conditions, testing requirements, inspection requirements and
documentation requirements for availability and project-specific
pricing.
