15NiCuMoNb5

  Grade :   15NiCuMoNb5-6-4
 Number:   1.6368
 Classification:   Alloy special steel
 Standard:  EN 10028-2: 2009 Flat products made of steels for pressure purposes. Non-alloy and alloy steels with specified elevated temperature properties
EN -2: 2014 Seamless steel tubes for pressure purposes. Technical delivery conditions. Non-alloy and tubes with specified elevated temperature properties

Chemical composition %   of   steel   15NiCuMoNb5-6-4 (1.6368):   EN 10028-2-2003

C Si Mn Ni P S Cr Mo N Nb Al Cu
max   0.17 0.25 – 0.5 0.8 – 1.2 1 – 1.3 max   0.025 max   0.01 max   0.3 0.25 – 0.5 max   0.02 0.015 – 0.045 max   0.015 0.5 – 0.8

Mechanical properties of   steel   15NiCuMoNb5-6-4 (1.6368)

Nominal thickness (mm): to 60 60 – 100 100 – 150 150 – 200
Rm – Tensile strength (MPa) 610-780 600-760 590-740 580-740
Nominal thickness (mm): to 40 40 – 60 60 – 100 100 – 150 150 – 200
ReH – Minimum yield strength (MPa) 460 440 430 420 410
KV – Impact energy (J) transverse, -20°
27

34
+20°
27-40
A – Min. elongation at fracture (%) 16-19

Mechanical properties

ReH Minimum yield strength / Mindestwert der oberen Streckgrenze / Limite d elasticite minimale
Rm Tensile strength / Zugfestigkeit / Resistance a la traction
A Minimum elongation / Mindestwert der Bruchdehnung / Allongement minimal
J Notch impact test / Kerbschlagbiegeversuch / Essai de flexion par choc

Heat treatment conditions

+A Soft annealed
+AC Annealed to achieve spheroidization of the carbides
+AR As rolled
+AT Solution annealed
+C Cold drawn / hard
+CR Cold rolled
+FP Treated to ferrite-pearlite structure and hardness range
+I Isothermal annealing
+LC Cold drawn / soft
+M Thermo mechanical rolling
+N Normalized
+NT Normalized and tempered
+P Precipitation hardened
+PE Peeled
+QA Air quenched and tempered
+QL Liquid quenched and tempered
+QT Quenched and tempered
+S Treated to improve shearability
+SH As rolled and turned
+SR Cold drawn and stress relieved
+T Tempered
+TH Treated to hardness range
+WW Warm worked
+U Untreated

 

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