Sanmac 2205 (Duplex 2205)

Description:

Sanmac 2205 is a machinability-improved version of the duplex (austenitic-ferritic) stainless steel Alloy 2205.

The good machining properties make Sanmac 2205 a superior alternative to standard 2205 grades and other duplex grades for applications subjected to all types of machining by extended tool life and possibilities to increase productivity.

Due to its excellent corrosion properties, Sanmac 2205 is a highly suitable material for service in environments containing chlorides and hydrogen sulfide. The material is suitable for use in the extraction of oil and gas from sour wells, in refineries and in process solutions contaminated with chlorides.

Sanmac 2205 is particularly suitable for heat exchangers where chloride-bearing water or brackish water is used as a cooling medium. The steel is also suitable for use in dilute sulfuric acid solutions and for the handling of organic acids, e.g. acetic acid and mixtures.

The high strength of Sanmac 2205 makes the material an attractive alternative to the austenitic steels in structures subjected to heavy loads.

The good mechanical and corrosion properties make Sanmac 2205 an economical choice in many applications by reducing the life cycle cost of the equipment.

(Sanmac is a registered trademark of Sandvik Intellectual Property AB)

Key Features:

  • Excellent machinability
  • High resistance to stress corrosion cracking (SCC) in chloride-bearing environments
  • High resistance to stress corrosion cracking (SCC) in environments containing hydrogen sulfide
  • High resistance to general corrosion, pitting and crevice corrosion
  • High mechanical strength – roughly twice the proof strength of austenitic stainless steels
  • High resistance to erosion corrosion and corrosion fatigue
  • Good weldability

Applications:

  • Process industry components in sulphuric acid, nitric acid, phosphoric acid, ethylene oxide, polypropylene & PVC production
  • Equipment handling organic & fatty acids, chemical storage, tankers, heat exchangers
  • Marine industry and shipbuilding propellers, shafts, rudders, shaft seals, pumps, bolts, fasteners, valves, instrumentation
  • Oil and chemical tankers
  • Oil & Gas industry pumps, valves, pipe, vessels, wellhead equipment, subsea equipment, separators, heat exchangers
  • Pollution control systems, effluent scrubbing, flue gas desulphurisation (FGD)
  • Waste water treatment, sour water purification
  • Pulp & paper industry applications such as pulp liquor heaters, bleach tower linings, digesters, brownstock washers
  • Food industry applications including brewery piping, evaporators, hot liquor tanks, presses

Chemical Composition:

Cr Ni Mo Co Nb (+Ta) Ti V W Cu C Mn N Si P S Fe Al
Min 22.00 4.50 3.00 0.14 0.20
Max 23.00 6.50 3.50 0.03 0.20 0.70 0.03 0.02 Bal

Mechanical Properties:

0.2% Proof Stress 450 N/mm2 91.4ksi
Tensile Strength 655 N/mm2 123.3ksi
Elongation, 5.65√S0 25%
Reduction of area 45%
Hardness (Brinell) <270
Impact Strength (Room Temp) 80J (av)
Impact Strength (-46°C) : Longitudinal <100mm 80J
100-260mm 45J (35J min)
>260mm For info only
Impact Strength (-46oC) : Transverse 50-260mm 45J (35J min)
>260mm For info only

Notes:

  1. Testing shall be carried out in accordance with ASTM A370 or EN ISO 6892-1 (tensile), EN ISO 6506-1 (hardness)
  2. Minimum properties quoted (tested at room temperature in a longitudinal direction)
  3. Testing performed on each melt of material per heat treatment batch
  4. Hardness shall be in accordance with NACE MR 1075
  5. ASTM G48A corrosion test (at 25°C) No pitting and < 3.0g/m2 weight loss
  6. Ferrite content 40-55%
  7. Microstructure certified free from grain boundary carbides, sigma, chi and laves phases

Physical Properties:

Density (Kg/m3) 7810
Magnetic Permeability (20°C) <50
Young’s Modulus (kN/mm2) 190
Specific Electrical Resistance, 20°C (µΩ.m) 0.85
Mean coefficient of thermal expansion, 20-300°C (m/m/oC) 11 x 10-6
Specific Heat, 20°C (J/kg.K) 400
Thermal conductivity, 20°C (W/m.K) 15

Downloads

Sanmac 2205 - product datasheet

Sanmac 2205 - product datasheet

Sanmac - stainless steels for machining (inc. machining properties)

Sanmac - stainless steels for machining (inc. machining properties)