SA240 gr 321 Properties and Aplications

SA240 gr 321 is a type of stainless steel produced in accordance with ASTM A240 standard, which is often used in high-temperature and corrosive environments.

SS 321 Plate Equivalent grades

JIS G4304	ASTM	UNS	KS	EN10095	AS	CNS
SUS321	321	S32100	STS321	1.4541	321	321

Chemical composition:

Type	Grade
	ASTM (A240M)	Others (JIS)	C	Si	Mn	P	S	Ni	Cr
Austenitic Steels
	321	SUS321	≤0.08	≤0.75	≤2.00	≤0.045	≤0.030	9.0/12.0	17.0/19.0

Titanium (Ti): a minimum of 5 times the carbon (C) content, but not more than 0.70%.

Physical Properties

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
321	8027	193	16.6	17.2	18.6	16.1	22.2	500	720

Mechanical Properties

Type	Mechanical Properties for Stainless Steel Plates, Stainless Steel Sheet
	ASTM (A240M)	Others (JIS)	Tensile Properties			Hardness
			Yield Strength (Mpa)	Tensile Strength (Mpa)	Elongation (%)	HBW			HRBW
Austenitic Steels
	321	SUS321	≥205	≥515	≥40	≤217			≤95

SA240 gr 321 has good corrosion resistance in environments containing nitric acid and organic salts. It also has good high-temperature strength and can be used at temperatures up to approximately 900 degrees Celsius.

Applications of SA240 gr 321 include:

• Components in the chemical and petrochemical industry
• Equipment in thermal power plants and nuclear power plants
• Heat-resistant equipment in the food and pharmaceutical industry
• Applications in the medical field, such as in dental equipment.