**Z12CKNDWNb21-20-20**Application:The vent valve steel
Category	Type	Steel grade	Standard	Country
Grades	Special Alloy	Z12CKNDWNb21-20-20	AFNOR	France

Chemical composition%of the ladle analysis of gradeZ12CKNDWNb21-20-20

C(％)	Si(％)	Mn(％)	P(％)	S(％)	Cr(％)	Ni(％)	Mo(％)	W(%)	N(%)	Co(%)	Nb(%)
0.08-0.16	Max 1.00	1.00-2.00	Max 0.040	Max 0.030	20.0-22.5	19.0-21.0	2.50-3.50	2.00-3.00	0.10-0.20	18.5-21.0	0.75-1.25

Z12CKNDWNb21-20-20

Mechanical properties of gradeZ12CKNDWNb21-20-20
Proof strength R_p0.2(MPa)	Tensile strength R_m(MPa)	Impact energy KV(J)	Elongation at fracture A(%)	Reduction in cross section on fracture Z(%)	As-Heat-Treated Condition	Brinell hardness(HBW)
957(≥)	441(≥)	33	43	43	Solution and Aging,Annealing,Ausaging,Q+T,etc	443

Physical properties of gradeZ12CKNDWNb21-20-20
Property	Density kg/dm3	Temperature T °C/F	Specific heat J/kgK	Thermal conductivity W/mK	Electric resistance µΩ·cm	Modulus of elasticity kN/mm2
942(≥)	643(≥)	21	44	12	Solution and Aging,Annealing,Ausaging,Q+T,etc	344
Temp. °C/°F	Creep strain limit (10000h) (Rp1,0)N/mm2	Creep rupture strength (10000h) (Rp1,0)N/mm2
223	496	119

Z12CKNDWNb21-20-20Range of products
Product type	Products	Dimension	Processes	Deliver Status
Plates/Sheets	Plates/Sheets	0.08-200mm(T)WL	Forging,hot rolling and cold rolling	Annealed,Solution and Aging,Q+T,ACID-WASHED,Shot Blasting
Steel Bar	Round Bar,Flat Bar,Square Bar	Φ8-1200mm*L	Forging,hot rolling and cold rolling,Cast	Black,Rough Turning,Shot Blasting,
Coil/Strip	Steel Coil/Steel Strip	0.03-16.0x1200mm	Cold-Rolled&Hot-Rolled	Annealed,Solution and Aging,Q+T,ACID-WASHED,Shot Blasting
Pipes/Tubes	Seamless Pipes/Tubes,Welded Pipes/Tubes	OD:6-219mm x WT:0.5-20.0mm	Hot extrusion,Cold Drawn,Welded	Annealed,Solution and Aging,Q+T,ACID-WASHED

Cross Reference Table(Equivalent Grade)
Grade	Standard	Country	Application
Z12CKNDWNb21-20-20	AFNOR	France	Valve steels and alloys for internal combustion engines

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