Grade 409 stainless steel from Gnee

Key Properties

The properties given below relate to annealed tubing of ASTM A268. The specified properties may not be similar to other products such as bar and coil.

Composition

The typical chemical compositional ranges of grade 409 stainless steels are given below:

Table 1 - Composition ranges of grade 409 stainless steels

Grade		C	Mn	Si	P	S	Cr	Ni	Ti
409	min. max.	- 0.08	- 1.00	- 1.00	- 0.045	- 0.045	10.5 11.75	- 0.5	6x C 0.75

Mechanical Properties

The table below provides the mechanical properties of grade 409 stainless steels:

Table 2 - Mechanical properties of grade 409 stainless steels

Grade	Tensile Strength (MPa) min	Yield Strength 0.2% Proof (MPa) min	Elongation (% in 50mm) min	Hardness
				Rockwell B (HR B) max	Brinell (HB) max
409	450	240	25	75	131

Physical Properties

The physical properties of annealed grade 409 stainless steels are tabulated below:

Table 3 - Physical properties of annealed grade 409 stainless steels

Grade	Density (kg/m3)	Elastic Modulus (GPa)	Mean Coefficient of Thermal Expansion (μm/m/°C)			Thermal Conductivity (W/m.K)		Specific Heat 0-100°C (J/kg.K)	Electrical Resistivity (nΩ.m)
			0-100°C	0-315°C	0-538°C	at 100°C	at 500°C
409	7800	200	11.0	11.7	12.4	25.8	27.5	460	600

Grade Specification Comparison

Table 4 provides approximate grade comparisons of 409 stainless steels:

Table 4 - Grade specifications for 409 grade stainless steel

Grade	UNS No	Old British		Euronorm		Swedish SS	Japanese JIS
		BS	En	No	Name
409	S40900	409S19	-	1.4512	X6CrTi12	-	SUH 409

Possible Alternative Grades

The following table gives possible alternative grades of 409 stainless steels:

Table 5 - Possible alternative grades of 409 stainless steels

Grade	Properties
3CR12	Easy to weld and good corrosion resistance. Heavy sections are more easily available when compared to 409.
304	High heat resistance and corrosion resistance. Grade 304 is expensive.
321	Better heat resistance when compared to 304 or 409.
Aluminized steel	Cheaper than grade 409 stainless steel, but less resistant to exhaust gases.