SUS439

SUS 439 stainless steel

SUS 439 is a chromium alloy stainless steel mainly composed of elements such as iron, chromium, cobalt and beryllium. It is classified as a chromium steel, with a chromium content of between 17-18%, which gives it superior resistance to oxidation and corrosion. In addition, the addition of cobalt and beryllium not only improves the mechanical properties at high temperatures but also increases the wear resistance of the material.

SUS 439 Chemical Properties

SUS 439 has a balanced chemical composition, mainly including elements such as chromium, iron, carbon, cobalt and beryllium. The addition of chromium gives it excellent oxidation resistance, especially suitable for working conditions at high temperatures. The relatively low carbon content helps improve weldability, making SUS 439 excellent in the welding process. 

439 Chemical composition (%)

ITEM	C	SI	MIN	P	S	CR	N	AI	TI	NB	CU
Min	===	===	===	===	===	17.00	===		===	===
Max	0.030	1.00	1.00	0.40	0.030	19.00	0.030	0.150	===	0.17

SUS 439 mechanical properties

SUS 439 has superior mechanical properties including high yield strength, tensile strength and hardness. This high strength makes SUS 439 suitable for applications requiring high strength and wear resistance, such as the manufacture of automotive exhaust systems.

439 mechanical properties

		MIN	MAX
Yield Strength (N/mm2)	0.20% Y.S.	205	N/mm2
	1% Y.S.	===
Tensile Strength (N/mm2)		415	N/mm2
Elongation %		22	===
Hardness Test	HRB	===	89
	HV	===	===

SUS 439 physical properties

The physical properties of SUS 439 include density, thermal conductivity and thermal expansion coefficient. Due to its high density and excellent thermal conductivity, SUS 439 is able to quickly equalize temperatures at high temperatures, and its moderate range of thermal expansion coefficient helps reduce stress caused by temperature changes.

SUS 439 corrosion resistance

SUS 439 has excellent corrosion resistance and is particularly suitable for high temperature and highly corrosive environments that are widely found in automobile exhaust systems. Its chromium alloy composition forms a stable oxide film that prevents further oxidation of the steel surface, thereby enhancing corrosion resistance.

SUS 439 product application

SUS 439 is a common stainless steel material in the automotive industry and is widely used in the manufacture of automotive exhaust systems, including exhaust pipes, mufflers and other components. SUS 439 excels in these applications due to its superior high temperature performance and corrosion resistance. In addition, it can also be used to manufacture chemical industry equipment, household appliances, etc., providing reliable solutions for various fields.