EN 10028-2:2017 12CrMo9-10 Steel: Specifications & Listings
EN 10028-2:2017 12CrMo9-10: 12CrMo9-10: chromium molybdenum alloy special steel for pressure purposes with specified elevated temperature properties. Specified in EN 10028-2:2017.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Si
Mn
P
S
N
Cr
Cu
Mo
Ni
0.10-0.15
<=0.30
0.30-0.80
<=0.015
<=0.010
<=0.012
2.00-2.50
<=0.25
0.90-1.10
<=0.30
Mechanical Properties
Tensile Strength
540-690 MPa
Yield Strength
>=355 MPa
Elongation
>=18%
Condition
Usual delivery condition normalized and tempered (+NT) or quenched and tempered (+QT), nominal thickness up to 250 mm; transverse direction, Yield Strength is ReH, Elongation is A
More data from EN 10028-2:2017
From the standard
Mechanical properties by thickness1 thickness ranges
Delivery condition
Thickness t (mm)
Yield strength ReH, min (MPa)
Tensile strength Rm (MPa)
Elongation A, min (%)
+NT or +QT
up to 250
355
540 to 690
18
Transverse direction; usual delivery condition as stated per row.
Source: EN 10028-2:2017, Table 3
Impact energy KV2 (Charpy V-notch)1 row
Condition or thickness
KV2 min at -20 deg C (J)
KV2 min at 0 deg C (J)
KV2 min at +20 deg C (J)
all thicknesses
27
40
70
A dash means a value may be agreed at the time of enquiry and order; 40 J may be agreed at +20 deg C where 31 or 27 J is listed.
Source: EN 10028-2:2017, Table 3
Proof strength at elevated temperature1 thickness range, 50 to 500 deg C
Thickness t (mm)
Rp0.2 min at 50 deg C (MPa)
Rp0.2 min at 100 deg C (MPa)
Rp0.2 min at 150 deg C (MPa)
Rp0.2 min at 200 deg C (MPa)
Rp0.2 min at 250 deg C (MPa)
Rp0.2 min at 300 deg C (MPa)
Rp0.2 min at 350 deg C (MPa)
Rp0.2 min at 400 deg C (MPa)
Rp0.2 min at 450 deg C (MPa)
Rp0.2 min at 500 deg C (MPa)
up to 250
341
323
311
303
298
295
292
287
279
-
Minimum 0.2 percent proof strength; delivery condition as given in Table 3.
Source: EN 10028-2:2017, Table 4
Heat treatment guidelineguideline temperatures
Normalizing temperature
920 to 980 deg C
Quenching temperature
-
Tempering temperature
650 to 750 deg C
Informative guideline (Annex A).
Source: EN 10028-2:2017, Table A.1
Stress relieving guidance (Pcrit)Pcrit and holding time
Pcrit value
19.3
Stress relieving temperature for 1 h holding
690 deg C
Stress relieving temperature for 2 h holding
680 deg C
Selected pairs of stress relieving temperature and holding time for guidance (Annex B).
Source: EN 10028-2:2017, Table B.1
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