Specialty Stainless Steel

Special stainless steels represent the advanced evolution of corrosion-resistant alloys, designed to deliver exceptional performance where standard austenitic grades fall short.

These steels combine enhanced nickel, molybdenum, nitrogen, and copper content, offering superior pitting, crevice, and stress corrosion cracking resistance across harsh chemical, marine, and high-temperature environments.

BMI supplies a full range of duplex, super duplex, precipitation hardening, and heat-resistant stainless steels, manufactured to ASTM, ASME, and EN standards.

SPECIFICATIONS FOR EVERY REQUIREMENT.

GRADES

Duplex: Stainless Steel 2205 (UNS S31803/S32205)
Super Duplex: Stainless Steel 2507 (UNS S32750), 255 (S32550
Precipitation Hardening (PH) Steels: 17-4PH (S17400), 15-5PH (S15500)
Heat Resistant Stainless Steels: 309, 310S, 321, 347
High-Molybdenum Austenitics: 904L (N08904), 254 SMO (S31254)
Nitrogen-Enhanced Grades: 2101, 2304H

Specialty grades available upon request.

PRODUCT RANGE

Sheets & Plates: 0.3–100 mm thick, up to 2500 mm wide
Pipes & Tubes: 6–610 mm (Seamless), 12–1200 mm (Welded)
Bars & Rods: 3–400 mm dia, up to 6 m length
Fittings & Flanges: ½”–48”, Class 150–2500
Wire & Strips: 0.1–10 mm wire, 0.2–3 mm strip
Forgings: up to 2000 kg – discs, rings, shafts

Custom dimensions available upon request.

STANDARDS

Plates, bars, and pipes of stainless steels - ASTM A240 / A276 / A312 / A479

Duplex & super duplex seamless/welded pipes - ASTM A789 / A790 / A928

PH and martensitic stainless steels - ASTM A564 / A705

European stainless specifications - EN 10088 / EN 10272

Flanges and fittings - ASME B16.5 / B16.9

Oil & gas corrosion resistance certification - NACE MR0175 / ISO 15156

MAKE

We source and stock products regularly from:

Outokumpu (Finland / Sweden) – Duplex & super duplex specialists
Aperam (France / Belgium) – Austenitic & high-performance grades
Sandvik Materials Technology (Sweden) – Heat & corrosion-resistant steels
Thyssenkrupp Nirosta (Germany) – Precision rolled stainless steels
Carpenter Technology (USA) – PH and high-strength stainless grades
ATI Specialty Alloys (USA) – Advanced precipitation-hardened stainless
Jindal Stainless (India) – Duplex and high-molybdenum stainless steels

Specific Makes are available upon request

MTC is always provided when you choose BMI

QUALITY PARAMETERS SET BY BMI

Exceptional Corrosion Resistance in chloride and acidic environments
High Mechanical Strength and fatigue endurance
Excellent Weldability & Fabrication characteristics
Enhanced Resistance to stress corrosion cracking and pitting
Superior High-Temperature Stability (310S, 347H)
Low Thermal Expansion for dimensional stability under heat

CHEMICAL COMPOSITION

Element Duplex 2205 Super Duplex 2507 17-4PH 904L 310S

C (max) 0.03 0.03 0.07 0.02 0.08

Cr 22.0 25.0 16.0 20.0 25.0

Ni 5.5 7.0 4.52 5.0 20.0

Mo 3.2 4.0 — 4.5 0.75

Cu — — — 1.5 —

N 0.17 0.27 — 0.02 —

Mn 1.2 1.2 1.0 2.0 2.0

Fe Balance Balance Balance Balance Balance

MECHANICAL PROPERTIES

Property Duplex 2205 Super Duplex 2507 17-4PH (H900) 904L 310S

Tensile Strength (MPa) 620 800 1310 490 515

Yield Strength (MPa) 450 550 1170 220 205

Elongation (%) 25 25 12 35 40

Hardness (HB) 270 290 360 150 160

Max Service Temp (°C) 315 250 370 450 1100

INDUSTRY APPLICATIONS.

Oil & Gas: Subsea pipelines, risers, manifolds
Chemical Processing: Reactors, heat exchangers, evaporators
Desalination Plants: Reverse osmosis systems and brine heaters
Aerospace & Defense: Fasteners, turbine casings, actuators
Power Generation: Boilers, superheaters, furnace components
Marine: Propeller shafts, seawater valves, pumps
Pharmaceutical & Food: Process piping, tanks, cleanroom components