EN 10028-2:2017 10CrMo9-10 Steel: Specifications & Listings
EN 10028-2:2017 10CrMo9-10: 10CrMo9-10: 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
0.08-0.14
<=0.50
0.40-0.80
<=0.020
<=0.010
<=0.012
2.00-2.50
<=0.30
0.90-1.10
Mechanical Properties
Tensile Strength
480-630 MPa
Yield Strength
>=310 MPa
Elongation
>=18%
Condition
Usual delivery condition normalized and tempered (+NT), nominal thickness up to 16 mm; transverse direction, Yield Strength is ReH, Elongation is A
More data from EN 10028-2:2017
From the standard
Mechanical properties by thickness6 thickness ranges
Delivery condition
Thickness t (mm)
Yield strength ReH, min (MPa)
Tensile strength Rm (MPa)
Elongation A, min (%)
+NT
up to 16
310
480 to 630
18
+NT
over 16 to 40
300
480 to 630
18
+NT
over 40 to 60
290
480 to 630
18
+NT or +QT
over 60 to 100
280
470 to 620
17
+NT or +QT
over 100 to 150
260
460 to 610
17
+QT
over 150 to 250
250
450 to 600
17
Transverse direction; usual delivery condition as stated per row.
Source: EN 10028-2:2017, Table 3
Impact energy KV2 (Charpy V-notch)2 rows
Condition or thickness
KV2 min at -20 deg C (J)
KV2 min at 0 deg C (J)
KV2 min at +20 deg C (J)
up to 60 mm
-
-
31
over 60 to 250 mm
-
-
27
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 temperature6 thickness ranges, 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 16
288
266
254
248
243
236
225
212
197
185
over 16 to 40
279
257
246
240
235
228
218
205
191
179
over 40 to 60
270
249
238
232
227
221
211
198
185
173
over 60 to 100
260
240
230
224
220
213
204
191
178
167
over 100 to 150
250
237
228
222
219
213
204
191
178
167
over 150 to 250
240
227
219
213
210
208
204
191
178
167
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
19.2
Stress relieving temperature for 1 h holding
685 deg C
Stress relieving temperature for 2 h holding
675 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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