Sanicro 41 Hot Worked

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Description

Sanicro® 41 is a nickel alloy characterized by the following properties:


  • Very good resistance to stress corrosion cracking (SCC) in chloride and sour (H₂S/Cl⁻) environments
  • Very good resistance to corrosion in acidic media such as sulfuric acid
  • Superior resistance to pitting and crevice corrosion than steels of the ASTM 316 type
  • 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:

    Sanicro 41 Hot Worked


    Datasheet updated 2020-07-03 08:39 (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.

    Ashby charts

    Properties

    General

    PropertyValueTemperature

    Density

    8.1 g/cm³

    Show Supplier Material materials with Density of 8.1 g/cm³ at 23.0 °C

    23.0 °C

    Mechanical

    PropertyValueTemperatureComment

    Elongation A2

    30 %

    Show Supplier Material materials with Elongation A2 of 30 % at 23.0 °C

    23.0 °C

    min.

    Hardness, Rockwell B

    90 [-]

    Show Supplier Material materials with Hardness, Rockwell B of 90 [-] at 23.0 °C

    23.0 °C

    max.

    Tensile strength

    517 MPa

    Show Supplier Material materials with Tensile strength of 517 MPa at 23.0 °C

    23.0 °C

    Yield strength Rp0.2

    172 MPa

    Show Supplier Material materials with Yield strength Rp0.2 of 172 MPa at 20.0 °C

    20.0 °C

    Thermal

    PropertyValueTemperatureComment

    Coefficient of thermal expansion

    1.42E-5 1/K

    Show Supplier Material materials with Coefficient of thermal expansion of 1.42E-5 1/K at 100.0 °C

    100.0 °C

    for 30°C to the mentioned temperature

    1.46E-5 1/K

    Show Supplier Material materials with Coefficient of thermal expansion of 1.46E-5 1/K at 200.0 °C

    200.0 °C

    for 30°C to the mentioned temperature

    1.49E-5 1/K

    Show Supplier Material materials with Coefficient of thermal expansion of 1.49E-5 1/K at 300.0 °C

    300.0 °C

    for 30°C to the mentioned temperature

    1.51E-5 1/K

    Show Supplier Material materials with Coefficient of thermal expansion of 1.51E-5 1/K at 400.0 °C

    400.0 °C

    for 30°C to the mentioned temperature

    1.53E-5 1/K

    Show Supplier Material materials with Coefficient of thermal expansion of 1.53E-5 1/K at 500.0 °C

    500.0 °C

    for 30°C to the mentioned temperature

    Specific heat capacity

    440 J/(kg·K)

    Show Supplier Material materials with Specific heat capacity of 440 J/(kg·K) at 20.0 °C

    20.0 °C

    Thermal conductivity

    11 W/(m·K)

    Show Supplier Material materials with Thermal conductivity of 11 W/(m·K) at 20.0 °C

    20.0 °C

    Chemical properties

    Property

    Carbon

    0.03 %

    max.

    Chromium

    20 %

    Copper

    1.7 %

    Iron

    Balance

    Manganese

    0.8 %

    Molybdenum

    2.6 %

    Nickel

    38.5 %

    Phosphorus

    0.03 %

    max.

    Silicon

    0.5 %

    max.

    Sulfur

    0.01 %

    max.

    Titanium

    0.7 %

    Technological properties

    Property
    Application areas

    Sanicro® 41 is particularly suited for use in heat exchangers for crude oil and oil refineries, especially where high concentrations of hydrogen sulphide and chloride are present.

    Cold Forming

    The excellent formability of Sanicro® 41 enables the material to be cold bent to extremely small radii. Annealing after bending is not normally necessary.

    Compliance

    Approvals:

  • Approved by the American Society of Mechanical Engineers (ASME) for use in accordance with ASME Boiler and Pressure Vessel Code, Section I and Section VIII, div. 1, and Division 2, Class 1 and Class 2.
  • ASME B&PV Code Section III, Division 1, Classes 1 and 3.
  • Corrosion properties

    General corrosion: Sanicro® 41 possesses excellent resistance to corrosion. The material is far superior to molybdenum alloyed steels such as AISI 316L, particularly when exposed to non-oxidizing media such as sulfuric acid or phosphoric acid. It also has satisfactory resistance to highly oxidizing agents such as nitric acid. Sanicro® 41 has significantly better corrosion resistance in formic acid than standard austenitic stainless steels.

    The results of corrosion tests in nitric acid are tabulated below. Resistance to sulfuric acid is illustrated in Figure 1. It should be noted that the corrosiveness of sulfuric acid depends on the oxygen content. Sulfuric acid in contact with air is, therefore, more corrosive than deaerated acid.

    Pitting and crevice corrosion:Corrosion tests carried out in sodium chloride solutions indicate that the resistance of Sanicro® 41 to pitting and crevice corrosion is superior to that of AISI 316- a result of the higher chromium and molybdenum contents of the material. Critical pitting temperatures (CPT) for the two grades in 3% sodium chloride solutions at different pH values are plotted in Figure 2.

    Stress corrosion cracking:The high nickel content of the material promotes excellent resistance to stress corrosion cracking induced by both chlorides and alkalis. The results of stress corrosion cracking tests in 40 % calcium chloride are shown in Figure 3.

    Sanicro® 41 displays excellent resistance to stress corrosion cracking in sour environments. Tests carried out at the Nickel Development Institute (NIDI), concluded that Sanicro® 41 could be used in sour environments up to 260°C with H₂S contents corresponding to a partial pressure of up to 10000 psi, in the absence of elementary sulfur. The material also shows some immunity to all concentrations of CO₂, according to NIDI. Sanicro 41 is used in the oil and gas industry in environments up to 200°C (392°F), a 60 psi partial pressure of H₂S and with chlorides present.

    According to ISO 15156/NACE MR0175 it is acceptable for use in the cold worked and annealed condition with no environmental limits in respect of partial pressures of H₂S or elemental sulfur.

    Intergranular corrosion: Even in the heaviest sizes, Sanicro® 41 can be welded without the risk of carbide precipitation causing intergranular corrosion. This is due, in part, to the low carbon content of the material, but also to the fact that it is titanium stabilized.

    Heat Treatment

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

    Solution annealing: 1000-1100°C (1830-2010°F), 5-10 minutes, rapid cooling in air or water.

    Other

    Forms of supply:

    Seamless tube and pipe- finishes and dimensions: Heat exchanger tubing, straight or bent to specification, with or without heat treatment of bends, can be supplied. Seamless tube and pipe in Sanicro® 41 can be supplied in dimensions up to 260 mm (10") outside diameter. The delivery condition is solution annealed and either white pickled or bright annealed.


    Materials for oil and gas production (Cold worked seamless tube and pipe):

    For production tubing and casing in oil and gas production, Sanicro® 41 is supplied cold worked with high strength properties (Sanicro 41-110).


    Size range:

  • Outside diameter: 2 3/8" - 7" (60.33-177.8 mm)
  • Wall thickness: 0.190"-0.590" (4.83-14.99 mm)
  • Welding

    The weldability of Sanicro® 41 is good. 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.


    Since the material has low thermal conductivity and high thermal expansion. Welding plans should therefore be carefully selected in advance, so that distortions of the welded joint are minimized. If residual stresses are a concern, solution annealing can be performed after welding.

    For Sanicro® 41, heat-input of <1.0 kJ/mm and interpass temperature of <100°C (210°F) are recommended. A string bead welding technique should be used.


    Recommended filler metals for temperature

    • TIG/GTAW or MIG/GMAW welding
      • ISO 18274 S Ni 8065/AWS A5.14 ERNiFeCr-1 (e.g. Exaton Sanicro 41 Cu)
      • ISO 14343 S 27 31 4 Cu L/AWS A5.9 ER383 (e.g. Exaton 27.31.4.LCu)
    • MMA/SMAW welding
      • ISO 14172 E Ni 8025, E Ni 8165
      • ISO 3581 E 27 31 4 Cu L R/AWS A5.4 E383-16 (e.g. Exaton 27.31.4.LCuR)


    Overlay welding:

  • ISO 18274 S Ni 8065/AWS A5.14 ERNiFeCr-1 (e.g. Exaton Sanicro 41 Cu) wire or strip electrodes are recommended for overlay welding of tube sheets and high-pressure vessels in cases where corrosion resistance, equal to that of Sanicro® 41, is required.