Duplex Stainless Steel (DSS for short) refers to stainless steel with about 50% of ferrite and 50% of austenite, and generally less than 30% of the content of the less phase. In the case of low C content, the Cr content is 18%~28%, and the Ni content is 3%~10%. Some steels also contain alloying elements such as Mo, Cu, Nb, Ti, and N. Since its birth in the United States in the 1940s, duplex stainless steel has developed into the third generation. Its main feature is that the yield strength can reach 400-550MPa, which is twice that of ordinary stainless steel, so it can save materials and reduce equipment manufacturing costs. In terms of anti-corrosion, especially under the conditions of harsh medium environment (such as seawater, high chloride ion content), the anti-pitting corrosion, crevice corrosion, stress corrosion and corrosion fatigue properties of duplex stainless steel are obviously better than ordinary austenite Stainless steel, comparable to high alloyed austenitic stainless steels.
2507 stainless steel applications in the oil and gas industry;
Offshore shitaitian oil platform (heat exchanger pipe, water treatment and water supply system, fire protection system, sprinkler system, water stabilization system;
Petrochemical equipment;
Desalination (desalination) equipment (and the high-pressure pipe and seawater pipe in the equipment);
Mechanical and structural components requiring both high strength and high corrosion resistance;
Burning (waste) gas purification equipment.
Main ingredients: 25Cr-7Ni-4Mo-0.27N
Equivalent Grades
| Grade |
Euronorm |
China GB |
ASTM/ASME |
| No. |
| 2507 |
1.4410 |
00Cr22Ni5Mo3N |
SUS2507 |
Standard Specification
| Section |
Round, Square, Hexagonal bar, oval, shaped |
| Diamater |
0.254mm,1mm,10.0mm,25.4mm,50.8mm,76.2mm,101.6mm,127.0mm,152.4mm,300.0mm,600.0mm |
| Length |
Since the custom |
| Surface |
2B, 2D, BA, NO.1, NO.4, NO.8, 8K, mirror, checkered, embossed, hair line, sand blast, Brush, etching, etc |
| Finish |
Hot rolled Bar (HR), Cold rolled Bar (CR), 2B, 2D, BA NO(8), SATIN (Met with Plastic Coated) |
| Form |
Bars, Foils, Rolls, Plain Bar, Shim Bar, Perforated Bar, Chequered Bar, Strip, Flats,
Blank (Circle), Ring (Flange) etc. |
Composition content
| Grade |
C |
Mn |
Si |
P |
S |
Cr |
Mo |
Ni |
N |
| 2507 |
Min.
Max. |
≤0.03 |
≤1.20 |
≤0.80 |
≤0.035 |
≤0.02 |
24.0~26.0 |
3.0~5.0 |
6.0~8.0 |
0.24~0.32 |
SAF 2507 has high impact strength and is not suitable for prolonged exposure to temperatures higher than 570°F, which may reduce toughness.
Tensile strength: σb≥ 730MPa;
Elongation: δ≥20%
Characteristic machining technology
1D -- The surface has discontinuous granular shape, also known as fog surface.
Processing technology: hot rolling + annealing shot peening pickling + cold rolling + annealing pickling.
2D - A slightly silvery white colour.
Processing technology: hot rolling + annealing shot peening pickling + cold rolling + annealing pickling.
2B -- Silver white with better gloss and flatness than a 2D surface.
Processing technology: hot rolling + annealing shot peening pickling + cold rolling + annealing pickling + quenching and tempering rolling.
Ba - Excellent surface gloss, high reflectivity, like a mirror surface.
Processing technology: hot rolling + annealing shot peening pickling + cold rolling + annealing pickling + surface polishing + quenching and tempering rolling.
No.3 -- Good gloss, coarse grain surface.
Processing technology: polishing and tempering rolling for 2D or 2B with 100~120 abrasive materials (JIS R6002).
No.4 -- Good gloss, fine lines on the surface.
Processing process: polishing and tempering rolling for 2D or 2B with 150~180 abrasive materials (JIS R6002).
HL -- Silver grey with hair streaks.
Processing technology: 2D products or 2B products with appropriate granularity of abrasive materials for polishing the surface is a continuous abrasive grain.
MIRRO -- Specular.
Processing technology: 2D products or 2B products with appropriate granularity of the grinding material grinding and polishing to the mirror effect.
Price List
| Stainless Steel 2507 Bar Price List |
2507 Bar FOB Shanghai Per Unit (USD) |
| 2507 stainless steel Round Bar |
$6000.00-$6300.00 |
| 2507 mirror Stainless Steel Bar |
$6325.00-$6500.00 |
| 2507 Stainless Steel Black Bar |
$6250.00-$6450.00 |
| 2507 Stainless Steel Square Bar |
$6000.00-$6300.00 |
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