EN 10028-2:2017 15NiCuMoNb5-6-4 Steel: Specifications & Listings
EN 10028-2:2017 15NiCuMoNb5-6-4: 15NiCuMoNb5-6-4: nickel copper molybdenum niobium 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
Al
N
Cr
Cu
Mo
Nb
Ni
<=0.17
0.25-0.50
0.80-1.20
<=0.025
<=0.010
>=0.015
<=0.020
<=0.30
0.50-0.80
0.25-0.50
0.015-0.045
1.00-1.30
Mechanical Properties
Tensile Strength
610-780 MPa
Yield Strength
>=460 MPa
Elongation
>=16%
Condition
Usual delivery condition normalized and tempered (+NT), nominal thickness up to 40 mm; transverse direction, Yield Strength is ReH, Elongation is A
More data from EN 10028-2:2017
From the standard
Mechanical properties by thickness5 thickness ranges
Delivery condition
Thickness t (mm)
Yield strength ReH, min (MPa)
Tensile strength Rm (MPa)
Elongation A, min (%)
+NT
up to 40
460
610 to 780
16
+NT
over 40 to 60
440
610 to 780
16
+NT
over 60 to 100
430
600 to 760
16
+NT or +QT
over 100 to 150
420
590 to 740
16
+QT
over 150 to 200
410
580 to 740
16
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
34
40
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 temperature5 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 40
447
429
415
403
391
380
366
351
331
-
over 40 to 60
427
410
397
385
374
363
350
335
317
-
over 60 to 100
418
401
388
377
366
355
342
328
309
-
over 100 to 150
408
392
379
368
357
347
335
320
302
-
over 150 to 200
398
382
370
359
349
338
327
313
295
-
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
880 to 960 deg C
Quenching temperature
-
Tempering temperature
580 to 680 deg C
Informative guideline (Annex A).
Source: EN 10028-2:2017, Table A.1
Stress relieving guidance (Pcrit)Pcrit and holding time
Pcrit value
17.5
Stress relieving temperature for 1 h holding
600 deg C
Stress relieving temperature for 2 h holding
590 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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