EN 10028-2:2017 20MnMoNi4-5 Steel: Specifications & Listings
EN 10028-2:2017 20MnMoNi4-5: 20MnMoNi4-5: manganese molybdenum nickel 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
V
0.15-0.23
<=0.40
1.00-1.50
<=0.020
<=0.010
<=0.012
<=0.20
<=0.20
0.45-0.60
0.40-0.80
<=0.02
Mechanical Properties
Tensile Strength
590-750 MPa
Yield Strength
>=470 MPa
Elongation
>=18%
Condition
Usual delivery condition quenched and tempered (+QT), 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 (%)
+QT
up to 40
470
590 to 750
18
+QT
over 40 to 60
460
590 to 730
18
+QT
over 60 to 100
450
570 to 710
18
+QT
over 100 to 150
440
570 to 710
18
+QT
over 150 to 250
400
560 to 700
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
50
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
460
448
439
432
424
415
402
384
-
-
over 40 to 60
450
438
430
423
415
406
394
375
-
-
over 60 to 100
441
429
420
413
406
398
385
367
-
-
over 100 to 150
431
419
411
404
397
389
377
359
-
-
over 150 to 250
392
381
374
367
361
353
342
327
-
-
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
-
Quenching temperature
870 to 940 deg C
Tempering temperature
610 to 690 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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