Stainless Steel - Grade 904L (UNS N08904)

Key Properties

The following sections describe the properties of flat rolled products in ASTM B625. The specifications may not be identical for other products such as bar, tube and pipe.

Composition

The table below provides the compositional ranges of grade 904L stainless steels:

Table 1. Composition ranges of grade 904L stainless steels

Grade		C	Mn	Si	P	S	Cr	Mo	Ni	Cu
904L	min. max.	- 0.02	- 2	- 1	- 0.045	- 0.035	19 23	4 5	23 28	1 2

Mechanical Properties

The typical mechanical properties of grade 904L stainless steels are given in the table below:

Table 2. Mechanical properties of grade 904L stainless steels

Grade	Tensile Strength (MPa) min	Yield Strength 0.2% Proof (MPa) min	Elongation (% in 50mm) min	Hardness
				Rockwell B (HR B)	Brinell (HB)
904L	490	220	36	70-90 typical	150

Physical Properties

The physical properties of grade 904L stainless steels are tabulated below:

Table 3. Typical physical properties of grade 904L stainless steels

Grade	Density (kg/m3)	Elastic Modulus (GPa)	Mean Co-eff of Thermal Expansion (µm/m/°C)			Thermal Conductivity (W/m.K)		Specific Heat 0-100°C (J/kg.K)	Elec Resistivity (nΩ.m)
			0-100°C	0-315°C	0-538°C	At 20°C	At 500°C
904L	7900	190	15	-	-	11.5	-	500	952

Grade Specification Comparison

The following table outlines the approximate grade comparisons of 904L stainless steels:

Table 4. Grade specifications of grade 904L stainless steels

Grade	UNS No	Old British		Euronorm		Swedish SS	Japanese JIS
		BS	En	No	Name
904L	N08904	904S13	-	1.4539	X1NiCrMoCuN25-20-5	2562	-