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25Cr-22Ni-2Mo Studs | BS EN 10088-3 X1CrNiMoN25-22-2 UNS S31050 Specification
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    • 25Cr-22Ni-2Mo Studs

    S31050, X1CrNiMoN25-22-2,310MoLN, UREA 25.22.2

    Stainless steel UNS S31050 is a fully austenitic stainless steel that does not have intermetallic phases such as intergranular carbide precipitations. Stainless steel UNS S31050 has an optimized chemical composition designed specifically for applications in urea plants. The nitrogen in the chemical composition helps to stabilize and strengthen the austenitic phase. This material provides improved corrosion-resistance in urea carbamate environments such as high-pressure strippers.

    Related Products

    310moln Fasteners 25cr-22ni-2mo Washers 1.4466 Screws X1CrNiMoN25-22-2 Nuts 25cr-22ni-2mo Bolts 1.4466 Screws 25cr-22ni-2mo Threaded Rod X1CrNiMoN25-22-2 Forgings

    25Cr-22Ni-2Mo Stud Properties

    25Cr-22Ni-2Mo Studs Chemical Requirements

    Steel designation % by mass a
    Name Number C Si Mn P S Cr Mo Ni N Cu Others
    X1CrNiMoN25-22-2 1.4466 0.020 0.70 2.00 0.025 0.010 24,0 to 26,0 2,00 to 2,50 21,0 to 23,0 0,10 to 0,16 - -
    • Elements not quoted in this table shall not be intentionally added to the steel without the agreement of the purchaser except for finishing the cast. All appropriate precautions are to be taken to avoid the addition of such elements from scrap and other materials used in production which would impair mechanical properties and the suitability of the steel.
    • a Maximum values unless indicated otherwise.
    • b Particular ranges of sulfur content may provide improvement of particular properties. For machinability a controlled sulfur content of 0,015 % to 0,030 % is recommended and permitted. For weldability, a controlled sulfur content of 0,008 % to 0,030 % is recommended and permitted. For polishability, a controlled sulfur content of 0,015 % max. is recommended.
    • c Where for special reasons, e.g. hot workability for the fabrication of seamless tubes where it is necessary to minimize the delta ferrite content, or with the aim of low magnetic permeability, the maximum Ni content may be increased by the following amounts:
    • *) Patented steel grade.

    25Cr-22Ni-2Mo Studs Mechanical Requirements

    Mechanical properties at room temperature of solution annealed a Austenitic steels and resistance to intergranular corrosion in conditions 1C, 1E, 1D, 1X, 1G and 2D

    Steel designation Thickness t or diameterb d
    mm    		 Hard-nessc,
    d
    HBW
    max.    		 0,2 %-
    proof strengt h
    e
    Rp0,2
    MPa*) min.    		 1 %-
    proof strength
    c,e
    Rp1,0
    MPa*) min.    		 Tensile strengthd, e
    Rm MPa*)    		 Elongation after fractured, e
    A
    %
    min.    		 Impact energy
    (ISO-V)
    KV2 J
    min.    		 Resistance to intergranular corrosionf
    Type Name Number in the delivery condition In the sensi-tized con-ditiong
    (long.) (tr.) (long.) (tr.)
    Special grades X1CrNiMoN25-22-2 1.4466 ≤ 160 240 250 290 540 to 740 35 - 100 - yes yes
    160 < t ≤ 250 - 30 - 60
    • For bigger sizes the mechanical values shall be agreed at the time of enquiry and order.
    • a Solution treatment may be omitted if the conditions for hot working and subsequent cooling are such that the requirements for the mechanical properties of the product and the resistance to Intergranular corrosion as defined in EN ISO 3651-2 are obtained.
    • b Width across flats for hexagons.
    • c Only for guidance.
    • d The maximum HB-values may be raised by 100 HB or the tensile strength value may be raised by 200 MPa and the minimum elongation value may be lowered to 20 % for sections and bars of ≤ 35 mm thickness having a final cold deformation and for hot formed sections and bars of ≤ 8 mm thickness.
    • e For rods, only the tensile strength values apply.
    • f When tested according to EN ISO 3651-2.
    • g See NOTE 2 to 6.4.
    • h Sensitization treatment of 15 min at 700 °C followed by cooling in air.
    • *) 1 MPa = 1 N/mm2

    Tensile strength of wire in diameters of 0,05 mm and above in 2H condition

    Steel designation b, c Tensile strength levels Range of tensile strength d MPa*)
    Name Number
    Austenitic steels
    X1CrNiMoN25-22-2 1.4466 +C500 500 to 700
    +C600 600 to 800
    +C700 700 to 900
    +C800 800 to 1000
    +C900 900 to 1100
    +C1000 1000 to 1250
    +C1100 1100 to 1350
    +C1200 1200 to 1450
    +C1400 1400 to 1700
    +C1600 1600 to 1900
    +C1800 1800 to 2100
    • a For spring applications, see EN 10270-3. For cold heading, see EN 10263-5.
    • b Not all grades are available in all tensile strength levels or all diameters. Guidance data for nominal dimensions d depending on strength levels are given in Annex B.
    • c Elongation depends on nominal dimensions d and may be agreed upon at the time of enquiry and order.
    • d Intermediate values may be agreed.
    • *) 1 MPa = 1 N/mm2

    Mechanical properties at room temperature of annealed wire in 2D condition a,b

    Steel designation Nominal dimension d
    mm    		 Tensile strength
    MPa*)
    max.    		 Elongation
    %
    min.
    Name Number
    Austenitic steels (+AT)c
    X1CrNiMoN25-2 1.4466 0,05 < d ≤ 0,10 1100 20
    0,10 < d ≤ 0,20 1050 20
    0,20 < d ≤ 0,50 1000 30
    0,50 < d ≤ 1,00 950 30
    1,00 < d ≤ 3,00 900 30
    3,00 < d ≤ 5,00 850 35
    5,00 < d ≤ 16,00 800 35
    • a If skin passed (i. e. less than 5 % reduction in cross section), the maximum tensile strength might be increased by up to 50 MPa.
    • b For cold heading, see EN 10263-5.
    • c +A = annealed, +AT = solution annealed.
    • *) 1 MPa = 1 N/mm2

    Minimum values for the 0,2 %-and 1 %-proof strength of austenitic steels at elevated temperatures

    Steel designation Heat treatment
    condition a    		 Minimum 0,2 %-proof strength (Rp 0,2) (MPa*)) Minimum 1 % proof strength (Rp 1,0) (MPa*)
    Name Number at a temperature (in °C) of
    100 150 200 250 300 350 400 450 500 550 100 150 200 250 300 350 400 450 500 550
    X1CrNiMoN25-22-2 1.4466 +AT 195 170 160 150 140 135 - - - - 225 205 190 180 170 165 - - - -
    • a +AT = solution annealed
    • b This grade is intended to be used at room temperature in the cold work hardened condition. Therefore, values for proof strength at elevated temperatures are not available. In cases where this grade is used in the solution annealed condition, the values of grade X5CrNi18-10 (1.4301) can be adopted.
    • *) 1 MPa = 1 N/mm2

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