Sandvik 3R60™ Urea Grade

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Description

Sandvik 3R60™ Urea Grade is a high-purity variant of ASTM 316L, specially developed for the urea industry. The grade has a guaranteed maximum ferrite content of 0.6%. Sandvik 3R60™ Urea Grade is characterized by:


  • High resistance to corrosion in ammonium carbamate
  • High resistance to intergranular corrosion
  • Good weldability

  • Datasheet URL:

    Sandvik 3R60™ Urea Grade


    Datasheet updated 2019-08-26 09:12 (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

    8 g/cm³

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    Recycled Content

    82.1 %

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    Average recycled content

    Mechanical

    PropertyTemperatureValueComment

    Charpy impact energy, V-notch

    -60.0 °C

    150 J

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    Elastic modulus

    20.0 °C

    200 GPa

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    100.0 °C

    194 GPa

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    200.0 °C

    186 GPa

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    300.0 °C

    179 GPa

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    400.0 °C

    172 GPa

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    500.0 °C

    165 GPa

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    Elongation

    23.0 °C

    40 %

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    min.

    Elongation A2

    23.0 °C

    35 %

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    min.

    Hardness, Rockwell B

    23.0 °C

    90 [-]

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    max.

    Tensile strength

    20.0 °C

    490 MPa

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    23.0 °C

    690 MPa

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    50.0 °C

    470 MPa

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    100.0 °C

    450 MPa

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    150.0 °C

    430 MPa

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    200.0 °C

    415 MPa

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    250.0 °C

    410 MPa

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    300.0 °C

    400 MPa

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    350.0 °C

    395 MPa

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    400.0 °C

    390 MPa

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    Yield strength Rp0.1

    20.0 °C

    235 MPa

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    min.

    50.0 °C

    225 MPa

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    min.

    100.0 °C

    200 MPa

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    min.

    150.0 °C

    180 MPa

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    min.

    200.0 °C

    165 MPa

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    min.

    250.0 °C

    155 MPa

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    min.

    300.0 °C

    145 MPa

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    min.

    350.0 °C

    140 MPa

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    min.

    400.0 °C

    135 MPa

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    min.

    450.0 °C

    145 MPa

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    min.

    500.0 °C

    140 MPa

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    min.

    550.0 °C

    140 MPa

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    min.

    600.0 °C

    120 MPa

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    min.

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    Yield strength Rp0.2

    20.0 °C

    190 MPa

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    min.

    50.0 °C

    180 MPa

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    min.

    100.0 °C

    165 MPa

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    min.

    150.0 °C

    150 MPa

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    min.

    200.0 °C

    140 MPa

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    min.

    250.0 °C

    130 MPa

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    min.

    300.0 °C

    120 MPa

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    min.

    350.0 °C

    115 MPa

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    min.

    400.0 °C

    110 MPa

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    min.

    450.0 °C

    115 MPa

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    min.

    500.0 °C

    110 MPa

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    min.

    550.0 °C

    110 MPa

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    min.

    600.0 °C

    95 MPa

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    min.

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    Thermal

    PropertyTemperatureValueComment

    Coefficient of thermal expansion

    100.0 °C

    1.65E-5 1/K

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    for 30°C to the mentioned temperature

    200.0 °C

    1.7E-5 1/K

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    for 30°C to the mentioned temperature

    300.0 °C

    1.75E-5 1/K

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    for 30°C to the mentioned temperature

    400.0 °C

    1.8E-5 1/K

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    for 30°C to the mentioned temperature

    500.0 °C

    1.8E-5 1/K

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    for 30°C to the mentioned temperature

    600.0 °C

    1.85E-5 1/K

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    for 30°C to the mentioned temperature

    700.0 °C

    1.85E-5 1/K

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    Specific heat capacity

    20.0 °C

    485 J/(kg·K)

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    100.0 °C

    500 J/(kg·K)

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    200.0 °C

    515 J/(kg·K)

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    300.0 °C

    525 J/(kg·K)

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    400.0 °C

    540 J/(kg·K)

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    500.0 °C

    555 J/(kg·K)

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    600.0 °C

    575 J/(kg·K)

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    Thermal conductivity

    20.0 °C

    14 W/(m·K)

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    100.0 °C

    15 W/(m·K)

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    200.0 °C

    17 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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    500.0 °C

    21 W/(m·K)

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    600.0 °C

    23 W/(m·K)

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    Chemical properties

    PropertyValueComment

    Carbon

    0.02 %

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    max.

    Chromium

    17.5 %

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    Iron

    Balance

    Manganese

    1.7 %

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    Molybdenum

    2.6 %

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    Nickel

    14 %

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    Phosphorus

    0.02 %

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    max.

    Silicon

    0.4 %

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    Sulfur

    0.01 %

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    max.

    Technological properties

    Property
    Application areas

    Typical urea plant applications of Sandvik 3R60™ Urea Grade are:

  • Carbamate condensers
  • Scrubbers
  • Decomposers
  • High pressure piping
  • Certifications

    Urea specifications issued by: Stamicarbon, Snamprogetti, Urea Casale and Kellogg

    Cold Forming

    Annealing after cold bending is not normally necessary, but the decision must be made after taking account of degree of bending and the operating conditions. Heat treatment, if any, should take the form of solution annealing, see under "Heat treatment".

    Corrosion properties

    The low ferrite and impurity contents of Sandvik 3R60 Urea Grade make it highly resistant to general and intergranular corrosion in the process solutions occurring in the manufacture of urea.


    Sandvik 3R60 Urea Grade easily meets the Huey test and selective attack requirements specified by Stamicarbon, Snamprogetti and Urea Casale. The general corrosion rate is normally set at 0.6 mm/year maximum for unsensitized material (24mpy, 3.3um/48h).

    Heat Treatment

    Tubes are delivered in the heat treated condition. If additional heat treatment is needed after further processing the following is recommended.

    Solution annealing: 1050-1100°C (1920-2010°F), 5-20 minutes, rapid cooling in water.

    Hot forming

    Hot bending is carried out at 1100–850°C (2010–1560°F) and should be followed by solution annealing.

    Machining

    The mechanical machining of stainless steels always requires an adjustment to cutting to data and machining method to give satisfactory results. When turning is undertaken with carbide tipped tools, the cutting speed should be reduced by 30% for finish machining and 60% for rough machining, compared with the cutting speeds applied for AISI 316. Much the same applies to other operations. If high speed steel tools are used, approximately the same cutting speed can be used as for AISI 316.


    Detailed recommendations for the choice of tools and cutting data are provided in brochure S-1,462-ENG. Select data as for grade 5R60 (AISI 316), taking into account the above comments.

    Other

    Forms of supply:

    Seamless tube and pipe in 3R65 is supplied in dimensions up to 260 mm outside diameter in the solution annealed and white-pickled condition or in the bright-annealed condition.


    We can also deliver other product forms from stock in a grade corresponding to 3R60 U.G mainly:

  • U-tubes can be supplied on request.
  • Urea high pressure pipe fittings and flanges

  • Filler metals for welding: The sizes listed below are Sandvik stock standard. Local market stocks comprise sizes in common demand. Fortechnical information on the filler metal please refer to brochures S-2361-ENG, S-2362-ENG and S-2366-ENG.

    Welding

    The weldability of Sandvik 3R60 Urea grade is good. Welding must be carried out without preheating and subsequent heat treatment is normally not required. Suitable methods of fusion welding are manual metal-arc welding (MMA/SMAW) and gas-shielded arc welding, with the TIG/GTAW method as first choice.


    For Sandvik 3R60 Urea grade, heat input of <1.5 kJ/mm and interpass temperature of <100°C (210°F) are recommended.


    Recommended filler metals:

    • TIG/GTAW or MIG/GMAW welding
      • ISO 14343 S 25 22 2 N L (e.g. Exaton 25.22.2.LMn)
    • MMA/SMAW welding
      • ISO 3581 E 25 22 2 N L B (e.g. Exaton 25.22.2.LMnB)