904L, 1.4539 spring stainless steel strip

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904L, 1.4539 spring stainless steel strip

904L, 1.4539 is a vacuum arc-remelted high-alloy austenitic stainless steel with very high cleanliness resulting in good polishability. The grade is also characterized by very good overall corrosion resistance and good weldability.

Standards

ASTM: ‘904L’
UNS: N08904
EN Number: 1.4539
EN Name: X1NiCrMoCu25-20-5
Nr.: 1.4539
DIN: X 1 NiCrMoCu 25 20 5
SS: 2562
AFNOR: Z1NCDU25-20-4

Chemical composition (nominal)

Chemical composition (nominal) %

C	Si	Mn	P	S	Cr	Ni	Mo	Cu
≤0.020	0.5	1.8	≤0.025	≤0.015	20	25	4.5	1.5

Mechanical properties

At 20°C (68°F)

The following figures apply to material in the solution annealed condition.

Proof strength R_p0.2^a) MPa ksi min. min.	R_p1.0^a) MPa min.	ksi min.	Tensile strength R_m MPa ksi	Elong. A^b) A_2″ % % min. min.	Hardness Vickers. approx.
230 33	250	36	520-720 75-104	35^c) 35	160

1 MPa = 1 N/mm²
a) R_p0.2 and R_p1.0 correspond to 0.2% offset and 1.0% offset yield strength, respectively.
b) Based on L₀ = 5.65 ÖS₀ where L₀ is the original gauge length and S₀ the original cross-section area.

Physical properties

Density: 8.0 g/cm³, 0.29 lb/in³

Thermal conductivity

Temperature, °C	W/(m °C)	Temperature, °F	Btu/(ft h °F)
20	12	68	7
100	14	200	8
200	16	400	9
300	18	600	10.5
400	20	800	11.5
500	22	1000	13
600	23	1200	14
700	25	1300	14.5

Specific heat capacity

Temperature, °C	J/(kg °C)	Temperature, °F	Btu/(lb °F)
20	460	68	0.11
100	485	200	0.12
200	515	400	0.12
300	545	600	0.13
400	570	800	0.14
500	590	1000	0.14
600	605	1200	0.15
700	615	1300	0.15

Temperature, °C	Per °C	Temperature, °F	Per °F
30-100	15.5	86-200	8.5
30-200	16	86-400	9
30-300	16.5	86-600	9
30-400	17	86-800	9.5
30-500	17	86-1000	9.5
30-600	17.5	86-1200	9.5
30-700	17.5	86-1300	10

Temperature, °C	μΩm	Temperature, °F	μΩin.
20	0.94	68	37.0
100	0.99	200	38.8
200	1.07	400	42.2
300	1.13	600	44.6
400	1.15	800	45.5
500	1.17	1000	45.8
600	1.15	1200	45.9
700	1.18	1300	46.5