National forewordThis British Stan ard isthe UK implementation of EN1 2 2-5:2 1.. This British Stan ard was publshed un e the a uthority of the Stan ards Polcy an Strat eg Committ ee on
Classification
The steel grades covered in this document are classified according to their structure into:
NOTE For more details see EN 10088–1.
Designation
5 Information to be supplied by the purchaser
Mandatory information
Shall be in accordance with EN 10222-1.
Options
This European Standard outlines several specified options, which are also applicable under EN 10222-1 If the purchaser fails to provide information regarding the implementation of these options during the inquiry and order process, the products will be supplied according to the basic specification as detailed in EN 10222-1.
1) test temperature for the tensile test at elevated temperature, if applicable (see 6.4.3);
2) test temperature of the impact test at low temperature (see 6.4.4);
3) controlled sulphur content (see Table 2, footnote b)
Steelmaking process and manufacture of the product
Shall be in accordance with EN 10222-1.
Delivery condition
The products shall be delivered in the heat treatment condition specified in Table 1.
Chemical composition and chemical corrosion properties
Cast analysis
The chemical composition (cast analysis), determined in accordance with EN 10222-1 shall conform to the requirements of Table 2.
Product analysis
The product analysis shall not deviate from the specified cast analysis (see 6.3.1) by more than the values specified in Table 3.
Resistance to intergranular corrosion
The specifications in Table 4 apply in respect to resistance to intergranular corrosion as defined in
EN ISO 3651-2, for austenitic and austenitic-ferritic steels
NOTE 1 EN ISO 3651-2 is not applicable for testing martensitic steels
NOTE 2 The corrosion resistance of stainless steels is very dependent on the type of environment and can therefore not always be clearly as certained through laboratory tests It is therefore advisable to draw on the available experience of the use of the steels
Mechanical properties
6.4.1 When heat treated in accordance with Table 1, the mechanical properties shall conform to the requirements of Table 4
6.4.2 Elevated temperature proof strength (Rp0,2 and Rp1,0) values shall conform to the requirements of Table 5 and Table 6 Elevated temperature tensile strength (Rm) values shall conform to Table 7
6.4.3 If verification of specified proof strength at elevated temperature is requested (see
According to EN 10222-1:2017, the testing temperature must be determined during the enquiry and order process If not specified, tests will be conducted at 300 °C, except for austenitic-ferritic steels, which will be tested at 250 °C.
6.4.4 The impact test, if applicable (see EN 10222-1:2017, Table 1), shall be carried out at 20 °C
Where impact tests at low temperature have been agreed (see EN 10222-1:2017, Table 1), the test temperature shall also be agreed at the time of enquiry and order
6.4.5 Reference data for 1 % (plastic) creep strain and creep rupture are given in Annex A.
Surface condition
Internal soundness
Physical properties
For reference data on physical properties, see EN 10088-1:2014, Annex E.
Post weld heat treatment
Guidelines for the purchaser on post weld heat treatment are given in Annex B
The material specifications include a solution annealed, tempered, and quenched treatment, with a hardness range of 1,040 to 1,120 w The tempering processes involve air (a), oil (o), or water-based mediums (w), with double tempering conducted at temperatures between 600 °C and 620 °C, and standard tempering at 570 °C to 600 °C Notably, the solution treatment can be bypassed if the hot working conditions and subsequent cooling meet the mechanical property requirements and resistance to intergranular corrosion as outlined in EN ISO 3651-2, ensuring compliance even after subsequent solution annealing.
Table 2 — Chemical composition (cast analysis)a
Steel name Steel number C Si max Mn max P max S max Cr Mo Ni N Others
X6CrNiTi18–10 1.4541 ≤ 0,08 1,00 2,00 0,045 0,015b 17,0 to 19,0 – 9,0 to 12,0 – Ti:5 x C to 0,70
X6CrNiNb18–10 1.4550 ≤ 0,08 1,00 2,00 0,045 0,015b 17,0 to 19,0 – 9,0 to 12,0 – Nb:10 x C to
Steel name Steel number C Si max Mn max P max S max Cr Mo Ni N Others
2,50 10,5 to 13,5 – Ti:5 x C to 0,70 X2CrNiMo17–12–3 1.4432 ≤ 0,030 1,00 2,00 0,045 0,015b 16,5 to 18,5 2,50 to
0,25 Cu: 0,50 to 1,50 X2CrNiCu19–10 1.4650 ≤ 0,030 1,00 2,00 0,045 0,015 18,5 to 20,0 – 9,0 to 10,0 ≤ 0,08 Cu ≤ 1,0
Steel name Steel number C Si max Mn max P max S max Cr Mo Ni N Others
Copper (Cu) content should range from 0.50% to 1.00% Elements not specified in this table must not be intentionally added to the steel without the purchaser's consent, except during the finishing of the cast It is essential to take all necessary precautions to prevent the introduction of such elements from scrap and other materials, as they could negatively affect the mechanical properties and suitability of the steel For products intended for machining, a controlled sulfur content of 0.015% to 0.030% is recommended and can be permitted by agreement.
Table 3 — Permissible deviations of the product analysis above the maximum or below the minimum limits of the requirement of cast analysis
When multiple product analyses are conducted for a single cast, any individual element values must either exceed the maximum permitted limit or fall below the minimum permitted limit for the chemical composition It is not acceptable for both conditions to apply simultaneously to one cast.
Table 4 — Mechanical properties at room temperature and for impact energy test at 20°C and − 196°C Steel grade
Thickness of the ruling section tR mm max
Steel name Steel number in the delivery conditio n in the sensitized condition at 20 °C at
−196 °C l tr, t l tr, t tr Martensitic steel
X2CrNi18–9 1.4307 +AT 250 200 230 500 to 700 45 35 100 60 60 yes yes
X2CrNi19–11 1.4306 +AT 250 180 215 460 to 680 45 35 100 60 60 yes yes
X2CrNiN18–10 1.4311 +AT 250 270 305 550 to 750 45 35 100 60 60 yes yes
X5 rNi18–10 1.4301 +AT 250 200 230 500 to 700 45 35 100 60 60 yes no
X6CrNiTi18–10 1.4541 +AT 450 200 235 510 to 710 40 30 100 60 60 yes yes
X6CrNiNb18–10 1.4550 +AT 450 205 240 510 to 710 40 30 100 60 40 yes yes
X6CrNi18–10 1.4948 +AT 250 195 230 490 to 690 45 35 100 60 – no no
X6CrNiTiB18–10 1.4941 +AT 450 175 210 490 to 690 40 30 100 60 – yes yes
X7CrNiNb18–10 1.4912 +AT 450 205 240 510 to 710 40 30 100 60 40 (yes) (yes)
X2CrNiMo17–12–2 1.4404 +AT 250 190 225 490 to 690 45 35 100 60 60 yes yes
X2CrNiMoN17–11–2 1.4406 +AT 160 280 315 580 to 780 45 35 100 60 60 yes yes
X5CrNiMo17–12–2 1.4401 +AT 250 205 240 510 to 710 45 35 100 60 60 yes no
Thickness of the ruling section tR mm max
Steel name Steel number in the delivery conditio n in the sensitized condition at 20 °C at
X2CrNiMo17–12–3 1.4432 +AT 250 190 225 490 to 690 45 35 100 60 60 yes yes
X2CrNiMoN17–13–3 1.4429 +AT 160 280 315 580 to 780 45 35 100 60 60 yes yes
X3CrNiMo17–13–3 1.4436 +AT 250 205 240 510 to 710 45 35 100 60 60 yes no
X2CrNiMo18–14–3 1.4435 +AT 160 200 235 520 to 670 45 35 100 60 60 yes yes
X2CrNiCu19–10 1.4650 +AT 450 210 245 520 to 720 45 40 100 60 60 (yes) (yes)
X3CrNiMo18–12–3 1.4449 +AT 450 220 255 520 to 720 45 40 100 60 60 (yes (yes)
X2CrNiN23–4 1.4362 +AT 160 400 – 600 to 830 25 20 120 90 – yes yes
Thickness of the ruling section tR mm max
Steel name Steel number in the delivery conditio n in the sensitized condition at 20 °C at
X2CrNiMoN25–7–4 1.4410 +AT 160 500 – 800 to 1000 30 25 200 100 – yes yes
7–4 1.4501 +AT 160 530 – 730 to 930 25 20 150 90 – yes yes a l = longitudinal to main forging direction, t = tangential, tr = transverse to main forging direction b When tested in accordance with EN ISO 3651-2
Table 5 — Minimum 0,2 % proof strength ( R p0,2) at elevated temperatures
Steel grade R p0,2,min in MPa at a temperature in ° C of:
Steel grade R p0,2,min in MPa at a temperature in ° C of:
Table 6 — Minimum 1,0 % proof strength ( R p1,0) for austenitic steels at elevated temperatures Steel grade R p1,0, min in MPa at a temperature in ° C of:
Steel grade R p1,0, min in MPa at a temperature in ° C of:
Table 7 — Minimum tensile strength ( R m) at elevated temperatures Steel grade R m, min in MPa at a temperature in ° C of:
Annex A (informative) Reference data for creep rupture strength
NOTE 1 The values given in Table A.1 are mean values of the scatter band considered until now
The strength values for elevated temperatures in Table A.1 do not indicate that the steels are suitable for continuous use at these temperatures The key factor is the total stress experienced during operation, and oxidation conditions may also be considered when applicable.
Extended time extrapolation values are applicable only for a minimum carbon content of 0.04% and a minimum nitrogen content of 0.06% These data are derived from the recommendations of the European Creep Collaborative Committee (ECCC, WG 3.3) and are also based on standards from DIN 17460 and BS PD 6525–1.
Annex B (informative) Post weld heat treatment
Welded assemblies of stainless steels discussed in this document typically do not require heat treatment, except for martensitic grades, which should be tempered if there is a risk of residual martensite in the heat-affected zone; refer to Table 1 for the appropriate temperatures.
During the heating of high chromium and molybdenum austenitic or austenitic-ferritic steel weldments with ferrite, intermetallic phases can form and must be re-dissolved during post-weld heat treatment Due to the overalloying of most filler metals compared to the equivalent basic grades, higher minimum solution temperatures than those listed in Table 1 may be required.
In the case of fully austenitic weld structures, it should be verified that mechanical properties of heat treated weldments conform to this document
Oxidation of surfaces which necessitates pickling, and possible distortion of the welded construction may raise further difficulties
Consequently post weld heat treatment of duplex and austenitic steels should be avoided, and therefore welding be planned carefully
In specific situations, such as with components that have increased wall thickness, it may be essential to implement post-weld heat treatment to meet stress-relief and intergranular corrosion resistance requirements This treatment helps prevent failures due to stress corrosion cracking or corrosion fatigue According to Table B.1, the process should involve holding the material at an intermediate temperature below the typical solution temperature, with stabilizing annealing for niobium or titanium-bearing grades and stress-relieving for unstabilized low carbon grades.
Post weld heat treatment can include solution annealing as outlined in Table 1, or it may occur at temperatures below the precipitation range of carbides and intermetallic phases; however, the latter method primarily reduces peak stresses.
Preheating austenitic-ferritic steels is an effective method to mitigate stress caused by shrinkage in thicker welded sections, as temperatures between 200 °C and 250 °C can reduce room temperature yield strength by approximately 50% This makes preheating a preferable option over post-weld heat treatment for preventing high stress levels in weldments It is recommended to apply a preheating temperature ranging from 120 °C to 200 °C, tailored to the specific steel type and thickness.
Table B.1 — Guideline on post weld heat treatment of austenitic steels
Steel name Steel number Stabilized steels
X6CrNi18–10 1.4948 not recommended a Minimum holding time: 30 min b Recommended if welded with stabilized filler metal c Recommended for components with greater wall thickness
Annex C (informative) Significant technical changes to the version EN 10222-5:1999
Significant technical changes to the previous version EN 10222-5:1999 are listed below:
1) updating of the normative references;
2) addition of a new Annex B (informative);
4) updating of the mandatory and optional information’s in chapter 5.2;
5) new statements concerning steelmaking process and delivery conditions;
6) Table 1 containing values and statements on the heat treatment of the steels updated;
7) new Table 4 containing values for the mechanical properties at room temperature;
8) updating of Annex ZA in relationship with EU Directive 2014/68/EU (previous Annexes ZA and ZB)
Relationship between this European Standard and the Essential
Requirements of EU Directive 2014/68/EU
This European Standard has been prepared under a Commission’s standardization request M/071 to provide one voluntary means of conforming to Essential Requirements of Directive 2014/68/EU
Citing this standard in the Official Journal of the European Union under the Directive establishes that adherence to the normative clauses outlined in Table ZA.1 provides a presumption of conformity with the Essential Requirements of Directive 2014/68/EU and related EFTA regulations, within the standard's defined scope.
Table ZA.1 — Correspondence between this European Standard and Annex I of Directive
2014/68/EU Clause(s)/subclause(s) of this EN Remarks/Notes
4.1d 6.2, 6.5, 6.6 Suitable for the processing procedures
The presumption of conformity remains valid only while the reference to this European Standard is included in the list published in the Official Journal of the European Union It is essential for users of this standard to regularly check the latest list in the Official Journal to ensure compliance.
WARNING 2 — Other Union legislation may be applicable to the product(s) falling within the scope of this standard
[1] EN 10021, General technical delivery conditions for steel products