Stainless steel 431 in China

Key Properties

The specified properties are for bar products in ASTM A276. The properties may not be necessarily similar to other forms such as forgings and plates.

Composition

Table 1. Composition ranges of grade 431 stainless steels

Grade		C	Mn	Si	P	S	Cr	Ni
431	min. max.	- 0.20	- 1	- 1	- 0.04	- 0.03	15 17	1.25 2.50

Mechanical Properties

Table 2. Mechanical properties of grade 431 stainless steels

Tempering Temperature (°C)	Tensile Strength (MPa)	Yield Strength 0.2% Proof (MPa)	Elongation (% in 50mm)	Hardness Brinell (HB)	Impact Charpy V (J)
Annealed *	862	655	20	285 max	-
204	1345	1055	20	388	50
316	1295	1035	19	375	53
427	1350	1080	19	388	#
538	1140	965	19	321	#
593	1015	770	20	293	64
650	960	695	20	277	84

Grade 431 is frequently stocked and supplied in "Condition T", with specified tensile strength of 850 - 1000MPa.

* Annealed tensile properties are typical for Condition A of ASTM A276; annealed hardness is the specified maximum. Grade 431 is only rarely stocked in annealed Condition A.

# Grade 431 should not be tempered between 425 and 600°C, due to the low impact resistance associated with this temperature range.

Physical Properties

Table 3. Typical physical properties of grade 431 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
431	7800	200	10.2	12.1	-	20.2	-	460	720