Sandvik SAF 3207 HD™

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Description

Sandvik SAF 3207 HD™ is a hyper-duplex (austenitic-ferritic) stainless steel for service in highly corrosive conditions where also high mechanical strength is necessary. This makes the grade ideal for applications such as deepwater umbilicals. Sandvik SAF 3207 HD™ is characterized by:


  • Excellent resistance to pitting and crevice corrosion
  • Excellent resistance to stress corrosion cracking (SCC) in hydrogen sulphide (H₂S) and chloride containing environments
  • High resistance to general corrosion in acidic and caustic environments
  • Excellent resistance to erosion corrosion
  • Excellent corrosion fatigue properties
  • Exceptionally high mechanical strength
  • Exceptionally high fatigue strength
  • Physical properties that offer design advantages
  • Good weldability

  • More technical information and charts that are relevant to the materials corrosion, mechanical and physical performance are displayed in the figures on the right side of the material page.


    Datasheet URL:

    Sandvik SAF 3207 HD™


    Datasheet updated 2019-12-20 10:08 (supersedes all previous editions)

    Related Standards

    Equivalent Materials

    This material data has been provided by Sandvik Materials Technology.

    All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
    Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

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    Properties

    General

    PropertyTemperatureValueComment

    Density

    23.0 °C

    7.7 g/cm³

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    Recycled Content

    82.1 %

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    Average recycled content

    Mechanical

    PropertyTemperatureValueComment

    Elastic modulus

    20.0 °C

    200 GPa

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    Elongation

    23.0 °C

    25 %

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    min.

    Elongation A2

    23.0 °C

    15 %

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    min.

    Hardness, Rockwell C

    23.0 °C

    36 [-]

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    max.

    Tensile strength

    20.0 °C

    850 - 950 MPa

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    depending on the wall thickness

    50.0 °C

    923 MPa

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    depending on the wall thickness

    100.0 °C

    850 MPa

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    depending on the wall thickness

    150.0 °C

    811 MPa

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    depending on the wall thickness

    200.0 °C

    784 MPa

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    depending on the wall thickness

    250.0 °C

    785 MPa

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    depending on the wall thickness

    300.0 °C

    791 MPa

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    depending on the wall thickness

    Yield strength Rp0.2

    20.0 °C

    700 - 770 MPa

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    min. depending on the wall thickness

    100.0 °C

    657 MPa

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    min. depending on the wall thickness

    150.0 °C

    609 MPa

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    min. depending on the wall thickness

    200.0 °C

    585 MPa

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    min. depending on the wall thickness

    250.0 °C

    582 MPa

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    min. depending on the wall thickness

    300.0 °C

    572 MPa

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    min. depending on the wall thickness

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    Thermal

    PropertyTemperatureValueComment

    Coefficient of thermal expansion

    100.0 °C

    1.35E-5 1/K

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    for 30°C to the mentioned temperature

    200.0 °C

    1.35E-5 1/K

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    for 30°C to the mentioned temperature

    300.0 °C

    1.4E-5 1/K

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    for 30°C to the mentioned temperature

    400.0 °C

    1.45E-5 1/K

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    for 30°C to the mentioned temperature

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    Specific heat capacity

    20.0 °C

    480 J/(kg·K)

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    100.0 °C

    510 J/(kg·K)

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    200.0 °C

    540 J/(kg·K)

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    300.0 °C

    570 J/(kg·K)

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    400.0 °C

    590 J/(kg·K)

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    Thermal conductivity

    20.0 °C

    13 W/(m·K)

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    100.0 °C

    15 W/(m·K)

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    200.0 °C

    16 W/(m·K)

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    300.0 °C

    18 W/(m·K)

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    400.0 °C

    20 W/(m·K)

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    Electrical

    PropertyTemperatureValue

    Electrical resistivity

    23.0 °C

    8.7E-7 Ω·m

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    Chemical properties

    PropertyValueComment

    Carbon

    0.03 %

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    max.

    Chromium

    32 %

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    Iron

    Balance

    Manganese

    1.5 %

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    max.

    Molybdenum

    3.5 %

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    Nickel

    7 %

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    Nitrogen

    0.5 %

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    Phosphorus

    0.04 %

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    max.

    Silicon

    0.8 %

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    max.

    Sulfur

    0.01 %

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    max.

    Technological properties

    Property
    Application areas

    Sandvik SAF 3207 HD™ hyper-duplex steel has been developed for deepwater umbilicals, an application with extreme requirements on pitting and crevice corrosion resistance, mechanical strength and fatigue properties.

    Offering greater yield strength, greater corrosion resistance and superior fatigue properties compared with super-duplex steels, Sandvik SAF 3207 HD™ hyper-duplex steel is also an excellent material choice for a range of other oil and gas applications. For example, when resistance to hydrogen sulfide (H₂S) is a requirement, such as in raw seawater injection, control lines and chemical injection lines, Sandvik SAF 3207 HD™ offers high reliability and operational safety leading to lower operating costs.

    Corrosion properties

    General corrosion: Sandvik SAF 3207 HD™ is highly resistant to corrosion by organic acids, e.g. formic acid and acetic acid, see Figure 4.


    Resistance to inorganic acids is comparable to, or even better than that of high alloy austenitic stainless steels in certain concentration ranges. Figures 5 and 6 show isocorrosion diagrams for sulfuric acid and hydrochloric acid, respectively.


    Pitting and crevice corrosion: The pitting and crevice corrosion resistance of stainless steel is primarily determined by the content of chromium, molybdenum and nitrogen. The manufacturing and fabrication practice, e.g. welding, are also of vital importance for the actual performance in service. A parameter for comparing the resistance to pitting in chloride environments is the PRE number (Pitting Resistance Equivalent).

    The PRE is defined as, in weight-%

    PRE = %Cr + 3.3 x %Mo + 16 x %N

    The minimum PRE-value for Sandvik SAF 3207 HD is 50.


    One of the most severe pitting corrosion tests, applied to stainless steels, is ASTM G48 i.e. exposure to 6% FeCl₃. In a modified version of the ASTM G48A test, the sample is exposed for periods of 24 hours. When pits are detected, together with a substantial weight loss (> 5 mg), the test is interrupted. Otherwise, the temperature is increased by 5°C (9°F) and the test continued with the same sample.


    The crevice corrosion test was performed in 6% FeCl₃, with a crevice specified in the MTI-2 procedure, where an artificial crevice is mounted on the sample with a torque of 0.28 Nm. The values obtained and comparisons with Sandvik SAF 2507® are given in Figure 7. Sandvik SAF 3207 HD™ performs better than Sandvik SAF 2507®.

    Heat Treatment

    The tubes are normally delivered in heat treated condition. If additional heat treatment is needed due to further processing the following is recommended.

    Solution annealing: 1040-1140°C (1905-2085°F), rapid cooling in air, protective atmosphere or water.

    Machining

    Being a dual phase material (austenitic-ferritic), Sandvik SAF 3207 HD™ will present a different tool wear profile from that of austenitic stainless steels.


    The cutting data (speed and feed) must, therefore, be lower than that recommended for austenitic grades.

    Other

    Forms of supply:

    Seamless tubes in Sandvik SAF 3207 HD™ can be supplied in typical umbilical tube dimensions. The delivery condition is either solution annealed and either white pickled or polished.

    Welding

    The weldability of Sandvik SAF 3207 HD™ is good. Welding must be carried out without preheating and subsequent heat treatment is normally not necessary. A suitable method of fusion welding is gas tungsten arc welding GTAW/TIG with shielding gas of Ar+2% N₂. For tube to tubesheet welding, it is recommended to use Ar+3% N₂ as shielding gas to have proper weld metal structure.


    For Sandvik SAF 3207 HD™, heat input of 0.2-1.0 kJ/mm and interpass temperature of <100°C (210°F) are recommended.


    Recommended filler metals:

  • GTAW/TIG welding
  • Exaton 27.7.5.L. For information on filler metal and welding method, please contact Sandvik.