X45CrNiW18-9, 1.4873 - valve steel

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Standards and chemical composition Specification Properties Treatment Replacements

Austenitic valve steel X45CrNiW18-9 chromium-nickel-tungsten for heavy-duty engine valves according to DIN 17480.

Standard	Steel Grade
	Chemical Composition %
	C:	Mn:	Si:	P:	S:	Cr:	Mo:	Ni:	V:	Ti:	Cu:	W:
EN/DIN	X45CrNiW18-9 - 1.4873 - 4873
EN/DIN	0.40 - 0.50	0.80 - 1.50	2.00 - 3.00	<0.045	<0.030	17.00 - 19.00	-	8.00 - 10.00	-	-	-	0.80 - 1.20
PN	4H14N14W2M
PN	0.40 - 0.50	<0.70	<0.80	<0.030	<0.030	13.00 - 15.00	0.25 - 0.40	13.00 - 15.00	<0.20	-	-	2.00 - 2.75
БДС	4Ch18N9S2WG - 4Х18Н9С2ВГ
БДС	0.40 - 0.50	0.80 - 1.40	2.00 - 3.00	<0.030	<0.030	17.00 - 20.00	-	8.00 - 10.00	-	-	-	0.80 - 1.20
GOST	45Ch14N14V2M - 45H14N14V2M - EL189 - 45Х14Н14В2М - ЕЛ189
GOST	0.40 - 0.50	<0.70	<0.80	<0.035	<0.020	13.00 - 15.00	0.25 - 0.40	13.00 - 15.00	<0.20	<0.20	<0.30	2.00 - 2.80
AFNOR	Z45CNW18-09 - Z 45 CNW 18-09 - X19T4
AFNOR	0.40 - 0.50	0.80 - 1.50	2.00 - 3.00	<0.040	<0.030	7.00 - 19.00	-	8.00 - 10.00	-	-	-	0.80 - 1.20
ČSN / STN	ČSN 17 322 - ČSN 17322
ČSN / STN	0.40 - 0.50	<0.70	<0.80	<0.040	<0.030	12.00 - 15.00	0.20 - 0.40	12.00 - 15.00	-	-	-	2.00 - 2.75
BS	BS 331S42
BS	0.37 - 0.47	0.50 - 1.00	1.00 - 2.00	<0.040	<0.030	13.00 - 15.00	0.40 - 0.70	13.00 - 15.00	-	-	-	2.20 - 3.00
MSZ	SZ 12 - SZ12
MSZ	0.40 - 0.50	0.90 - 1.40	2.30 - 3.00	<0.030	<0.030	17.00 - 19.00	-	8.50 - 10.00	-	-	<0.30	0.80 - 1.20
JIS	F SUH 31 - SUH31 - SUH 31 TK - SUH 31 TP
JIS	0.35 - 0.45	<0.60	1.50 - 2.50	<0.040	<0.030	14.00 - 16.00	-	13.00 - 15.00	-	-	-	2.00 - 3.00
STAS	45WNiCr180 - 45 WNiCr 180
STAS	0.40 - 0.50	0.80 - 1.50	2.00 - 3.00	<0.045	<0.030	17.00 - 19.00	-	8.00 - 10.00	-	-	-	0.80 - 1.20
AFNOR	Z35CNWS14-14 - Z 35 CNWS 14-14
AFNOR	0.30 - 0.40	<1.00	1.00 - 2.00	<0.040	<0.030	13.00 - 15.00	-	13.00 - 15.00	-	-	-	2.00 - 3.00
UNS AMS SAE	S66009 - S 66009 - 5700 - 5700 E - J1692 - J775 - EV 9 - K66009
UNS AMS SAE	0.35 - 0.50	<1.00	0.30 - 0.80	<0.045	<0.030	12.00 - 15.00	0.20 - 0.50	12.00 - 15.00	-	-	-	1.50 - 3.00

Stal X45CrNiW18-9 - specification and application

Austenitic valve steel with a high carbon content, intended for inlet and outlet valves of engines. It is characterized by high corrosion resistance in the gases of combustion engines. Heat-resistant up to 730℃

Mechanical properties of X45CrNiW18-9

Mechanical properties at ambient temperatures
Tensile strength	R_m	800 - 1000 MPa
The yield point	R_e	> 380 MPa
Elongation	A	> 25%
Contraction,	Z	> 35 %
Density	ρ	7.9 kg/dm³
Thermal conductivity	λ	14.5 W⋅m⁻¹ K⁻¹

Tensile strength at various temperatures

Tensile strength	The yield point	Temperature
600 MPa	250 MPa	500℃
550 MPa	230 MPa	550℃
500 MPa	210 MPa	600℃
410 MPa	190 MPa	650℃
350 MPa	170 MPa	700℃
270 MPa	140 MPa	750℃

Coefficient of linear expansion in the ranges of individual temperatures

Linear expansion
Temperature	values
20 - 300℃	17.5 ⋅ 10^-6 1/℃
20 - 500℃	18.2 ⋅ 10^-6 1/℃
20 - 700℃	18.6 ⋅ 10^-6 1/℃

Heat treatment of X45CrNiW18-9 steel

Type of process	Type of cooling	Temperature
Hardening	in water	1000 - 1050℃

Substitutes, equivalents and other species designations

4H14N14W2M

4CH18N9S2WG

4Х18Н9С2ВГ

45CH14N14V2M

45KH14N14V2M

EL189

45Х14Н14В2М

4873

ЕЛ189

Z45CNW18-09

Z 45 CNW 18-09

X19T4

ČSN 17 322

ČSN 17322

BS 331S42

SZ 12 - SZ12

F SUH 31

SUH31

X 45 CRNIW 18-9

SUH 31 TK

SUH 31 TP

STR31

STR 31

45WNICR180

45 WNICR 180

F-320.C

F-320 C

Z35CNWS14-14

Z 35 CNWS 14-14

S66009

S 66009

5700

5700 E

J1692

J775

EV 9

K66009

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