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 10216-2: 2014 Seamless steel tubes for pressure purposes. Technical delivery conditions. Non-alloy and alloy steel 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

0°
34

+20°
27-40

A – Min. elongation at fracture (%)

16-19

Mechanical properties

R_eH	Minimum yield strength / Mindestwert der oberen Streckgrenze / Limite d elasticite minimale
R_m	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