Chintamani Stainless Inc is ISO 9001:2008 certified manufacturer, supplier and exporter of Super Duplex Steel flanges in India and worldwide.The Super Duplex Flanges are made from super duplex steel, which has chromium, iron, and nickel in its chemical composition along with trace amounts of molybdenum. The Super Duplex Steel Flanges has both austenitic and ferritic microstructure and they have some excellent mechanical properties. The Super Duplex 2507 Flanges are known for their excellent resistance to chloride ion related stress corrosion cracking. The ASTM A182 UNS S32750 Slip On Flanges also have high thermal conductivity along with low coefficient of thermal expansion.

The chemical composition of the Din 1.4410 Pipe Flange enhances their resistance to pitting, crevice, and general corrosion. The Asme Sa182 F53 Threaded Flanges are widely used in various marine environments. The ASTM A182 UNS S32760 Blind Flanges are widely used in different piping systems to stop the flow inside. The ASTM A182 F51 Pipe Flange also has a wide range of applications in bleaching operations and selected food processing applications too. One can see the 2507 Super Duplex Welding Neck Flange is greatly used in shipbuilding companies for applications like propellers, shafts, pumps, valves, and so on. Basically, the Uns S32750 Socket Weld Flange is designed for those applications that need good corrosion resistance and enhanced strength.

The Alloy 2507 Blrf Flanges also show enhanced resistance to inorganic acids, especially in chloride containing media. Even though the Super Duplex Steel 2507 Orifice Flanges can be exposed to diluted hydrochloric acid containing environments, they should not be exposed to the concentrated HCl.
The balanced dual phase microstructure in the alloy of Werkstoff No 1.4410 Super Duplex Blind Flanges in conjunction with high tensile strength presents itself to be a cost effective and corrosion resistant solution, particularly in high chloride environments. Most Super Duplex UNS S32750 Flanges have similar advantages as its counterpart. For instance, super duplex alloys have a lower alloying cost, in addition to having an increased tensile and yield strength unlike similar ferritic and austenitic grades with equipment corrosion resistance in chlorine containing environments. In many cases, this gives the buyer a much required respite while purchasing smaller or thinner cross sectioned Super Duplex Stainless Steel Flanges without the need to compromise on both quality and performance.

The Din 1.4410 Lap Joint Flange has a very low carbon content and that is why there is a minimal risk of the occurrence of carbide precipitation at the grain boundaries during the process of heat treatment. The Saf 2507 Ring Type Joint Flange is a light-weighted product, whose shape, size, and dimensions can be customized as requested by the client.

Super Duplex Stainless Steel UNS S32750 Flange Pressure Rating

Grades	Density (lb/in 3)	Melting Point (°F)	Melting Point (°C)	Density (g/cm 3)
S32750	0.281	2460	1350	7.8

General characteristics

Steel designations

Performance

Typical chemical composition, % by mass

name

EN

ASTM Type

UNS

PRE

A1) %

Rp0.2 MPa

Grade family

C

Cr

Ni

Mo

N

2507

1.4410

2507

S32750

43

20

550

D

0.02

25.0

7.0

4.0

0.27

2205 stainless steel grades	Industry Specifications	UNS
Duplex 2507 2507 (EN 1.4410/UNS S32750) A super duplex product with higher corrosion resistance and mechanical strength than Forta DX 2205. Often used in extremely corrosive environments.	• Desalination plants • Industrial piping • Scrubbers • Oil and gas industry, typically tubular products, flanges,fittings and valves • Deep-sea pipelines	• Cold rolled coil and sheet • Hot rolled coil and sheet • Quarto plate • Bar • Wire rod • Semi-finished (bloom, billet, ingot & slab)
Duplex 32760 100 (EN 1.4501/UNS S32760) A super duplex product with higher corrosion resistance and mechanical strength than Forta DX 2205. Often used in extremely corrosive environments.	• Desalination plants • Industrial piping • Scrubbers • Oil and gas industry, typically tubular products, flanges, fittings and valves • Deep-sea pipelines	• Cold rolled coil and sheet • Hot rolled coil and sheet • Quarto plate • Bar • Wire rod • Semi-finished (bloom, billet, ingot & slab)

Performance

Elongation vs. corrosion resistance.

Elongation vs. Corrosion resistance

Strength vs. Corrosion resistance

Elongation vs. Corrosion resistance

Duplex stainless steels, known for their high chromium content, provide excellent corrosion resistance, particularly in uniform corrosion environments with rates below 0.1 mm/year. Forta DX 2205 shows superior resistance to chloride-contaminated sulfuric acid compared to traditional stainless steels like Supra 316L/4404, approaching the performance of Ultra 904L. In dilute hydrochloric acid, Forta SDX 2507 and similar high-alloyed duplex steels are suitable, though localized corrosion risks exist around crevices even within safe usage limits.

Corrosion resistance

• Uniform Corrosion: Due to high chromium content, these steels resist uniform corrosion well, typically less than 0.1 mm/year.
• Sulfuric Acid: DX 2205 shows superior resistance in sulfuric acid contaminated by chloride ions compared to Supra 316L/4404.
• Hydrochloric Acid: SDX 2507 and DX 2205 can be used in dilute hydrochloric acid, with potential risks of localized corrosion in crevices.
• Nitric Acid: LDX 2101 and DX 2304, with their high chromium content and low molybdenum, are suitable for environments where resistance to strongly oxidizing nitric acid is needed.

PRE values for Forta Duplex grades and some austenitic grades

Steel designations				PRE
name	EN	ASTM Type	UNS
2205	1.4462	2205	S32205	35
2507	1.4410	2507	S32750	43

Results from stress corrosion cracking immersion tests in chloride solutions

name	ASTM G123		ASTM G36
	25% NaCl, pH 1.5, 106°C (b.p.), 1,000 h	40% CaCl2, 100°C, 500 h	45% MgCl2, 155°C (b.p.), 24 h
	U-bend samples	4-PB samples (90% of Rp0.2)	U-bend samples
2205	No SCC	No SCC	SCC
2507	No SCC	No SCC	SCC

Mechanical properties according to EN 10088 and EN 10028

	EN	ASTM	Product form	Yield strength	Tensile	Elongation	Elongation
name		UNS		Rp0.2[MPa]	strength	A[%]	A80[%]
				Rm[MPa]
2507	1.4410	S32750	Cold rolled coil (C)	550	750–1000	20	20
			Hot rolled coil (H)	530	750–1000	20	20
			Quarto plate (P)	530	730–930	20	20
			Bar	530	730–930	25	–
	1.4510	S32760	Cold rolled coil (C)	550	750–1000	20	20
			Hot rolled coil (H)	530	750–1000	25	25
			Quarto plate (P)	530	730–930	25	25

Mechanical properties according to ASTM A240

	EN	ASTM	Product form	Yield	Yield	Tensile	Tensile	Elongation
name		UNS		strength	strength	strength	strength	A50[%]
				Rp0.2[MPa]	Rp0.2 [ksi]	Rm [MPa]	Rm [ksi]
2507	1.4410	S32750	Plate, sheet and strip	550	80	795	116	15
100	1.4501	S32760	Plate, sheet and strip	550	80	750	108	25

Mechanical properties at elevated temperatures, minimum yield strength according to EN 10028-7

name	Strength		100°C	150°C	200°C	250°C
2507	Tensile strength	Rm [MPa]	680	660	640	630

Physical properties

Metric values according to EN 10088-1

name	EN	ASTM Type	UNS	Density [kg/dm3]	Modulus of elasticity at 20°C [GPa]	Coefficient of thermal expansion 20–100°C [10-6/K]	Thermal conductivity at 20°C [W/(m x K)]	Thermal capacity at 20°C [J/(kg x K)]	Electrical resistivity at 20°C [Ω x mm2/m]
2507	1.4410	2507	S32750	7.8	200	13.0	15	500	0.8
100	1.4410	-	S32760	7.8	200	13.0	15	500	0.8

Imperial values converted from Table 10

name	Density [lbm/in3]	Modulus of elasticity [psi]	Coefficient of thermal expansion 68–212°F [μin / (in x °F)]	Thermal conductivity [Btu/(hr x ft x °F)]	Thermal capacity [Btu/(lbm x °F)]	Electrical resistivity [μΩ x in]
2507	0.282	29 x 106	7.2	8.7	0.119	31.50

Fabrication

Duplex stainless steel is suitable for all forming processes used for stainless steel. The high yield strength compared to austenitic and ferritic stainless steel can however give differences in forming behavior. Depending on the chosen forming technique there could be consequences, such as increased springback. This point is particularly relevant to the forming of any high strength steel. Moreover, an excellent interplay between high yield strength, work hardening rate and elongation promote the duplex grades for light weight and cost-efficient applications with complex shapes. The impact of the high strength varies for different forming techniques. Common for all is that the estimated forming forces will be higher than for the corresponding austenitic and ferritic stainless steel grades. This effect will usually be lower than expected from just the increase in strength since the choice of duplex stainless steel is often associated with gauge reduction. It is important to consider that duplex stainless steel may also be more demanding on the tools and on the lubricant. This should also be noted when looking to down gauge.

Welding consumables

name	EN	ASTM Type	UNS	Consumable ISO designation
2507	1.4410	2507	S32750	25 9 4 NL

General characteristics

Steel designations

Performance

Typical chemical composition, % by mass

name

EN

ASTM Type

UNS

PRE

A1) %

Rp0.2 MPa

Grade family

C

Cr

Ni

Mo

N

2507

1.4410

2507

S32750

43

20

550

D

0.02

25.0

7.0

4.0

0.27