Name: 2507 Duplex Stainless Steel Coil
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2507 Duplex Stainless Steel Coil

2507 duplex stainless steel coil is a super duplex stainless steel with a microstructure consisting of approximately 50% austenite and 50% ferrite. This alloy provides exceptional strength and outstanding resistance to chloride stress corrosion cracking, pitting, and crevice corrosion. The high chromium, molybdenum, and nitrogen contents give it superior corrosion resistance, making it suitable for the most demanding applications in aggressive environments.

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◉ PRODUCT SPECIFICATION

1. Standard Designations

UNS: S32750
ASTM: A790/A790M
EURONORM: 1.4410
JIS: SUS 329J4L
GB/T: 022Cr25Ni7Mo4N

2. Chemical Composition (% by weight)

Element	C	Si	Mn	P	S	Cr	Ni	Mo	N
Min	-	-	-	-	-	24.0	6.0	3.0	0.24
Max	0.030	0.80	1.20	0.035	0.020	26.0	8.0	5.0	0.32

3. Mechanical Properties (Annealed Condition)

Property	Yield Strength	Tensile Strength	Elongation	Hardness
Value	≥550 MPa	≥800 MPa	≥15%	≤310 HB

4. Corrosion Resistance

PREN Value: 40-45
Chloride Stress Corrosion Cracking: Excellent resistance
Pitting & Crevice Corrosion: Superior to 2205 and 317L
General Corrosion: Excellent in most acidic and chloride environments

5. Physical Properties

Property	Value
Density	7.8 g/cm³
Melting Range	1300-1390°C
Thermal Conductivity	13 W/m·K (100°C)
Thermal Expansion	13.0 × 10⁻⁶/K (20-100°C)
Modulus of Elasticity	200 GPa

6. Available Product Range (Coil)

Parameter	Specification
Thickness	0.5mm - 6.0mm
Width	600mm - 2000mm
Coil ID	508mm / 610mm
Coil OD	1000mm - 1500mm
Delivery Condition	Solution Annealed & Pickled

7. Surface Finishes

2B: Standard smooth matte finish (most common)
BA: Bright annealed finish
No. 1: Hot-rolled, annealed & pickled finish

8. Typical Applications

Offshore and marine applications
Chemical process industry
Oil and gas industry equipment
Pollution control equipment
Pulp and paper industry
Desalination plants

◉ Surfcae selection

SURFACE	CHARACTERISTIC	SUMMARY OF MANUFACTURING METHOD	APPLICATION
NO.1	Silvery white	Hot rolled to specified thickness	Do not need to have a glossy surface use
NO.1	lackluster	Hot rolled to specified thickness	Do not need to have a glossy surface use
NO.2D	Silvery white	After cold rolling, heat treatment and pickling are carried out	General material, deep material
NO.2B	Gloss is stronger than No.2D	After No.2D treatment, the final light cold rolling is carried out through the polishing roller	The general material
BA	As bright as a sixpence	No standard, but usually a bright annealed surface with high reflectivity.	Building materials, kitchen utensils
NO.3	Rough lapping	Grind with 100~200# (unit) strop tape	Building materials, kitchen utensils
NO.4	Intermediate grinding	Polished surface obtained by grinding with 150~180# strop abrasive tape	Building materials, kitchen utensils
NO.240	Fine lapping	Grinding with 240# strop abrasive tape	kitchenware
NO.320	Very fine grinding	Grinding was carried out with 320# strop abrasive tape	kitchenware
NO.400	The luster is close to BA	Use 400# polishing wheel to grind	General timber, building timber, kitchen appliances
HL	Hairline grinding	Suitable particle material for hair stripe grinding (150~240#) with many grains	Building, construction material
NO.7	It's close to mirror grinding	Use a 600# rotary polishing wheel to grind	For art or decoration
NO.8	Mirror ultrafinish	The mirror is ground with a polishing wheel	Reflector, for decoration

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