Stainless Steel Grade AISI 347 | EN 1.4550

AISI 347 | EN 1.4550 | DIN X6CrNiNb18-10 is an austenitic stainless steel, which is a stabilized version of AISI 304 with the addition of niobium (columbium). Niobium is a stabilizing element. Thanks to it, the main highlight of this brand is maximized: resistance to intercrystalline corrosion.

Physical properties

Table No. 1: physical properties of stainless steel grade AISI 347 | EN 1.4550 | DIN X6CrNiNb18-10
Density g/cm³	7,96
*Specific heat capacity at +20°C, J/kgK**	500
*Thermal conductivity at +20°C, W/mK**	15
*Specific electrical resistance at +20°C, μOhmm**	0,73

Table No. 2: physical properties of stainless steel grade AISI 347 | EN 1.4550 | DIN X6CrNiNb18-10
Temperature	+20°С	+100°С	+200°C	+300°С	+400°С	+500°С
Modulus of elasticity, GPa	200	194	186	179	172	165
Coefficient of linear expansion, 10^-6/°C	16,0	16,0	16,5	17,0	17,5	18,0

Hot deformation: temperature 1150 - 850°C, air cooling.
Solid solution processing: temperature 1020 - 1120 °C, cooling in water, in air.

Heat treatment before subsequent deformation
- Hard solution treatment: 1020 - 1100 °C
- Quenching in water, air or gas (cooling must be fast enough)
Hot deformation before subsequent processing
- temperature 1150 - 850 °C
- cooling in air or gas environment

Table: chemical composition of steel grade AISI 347 | EN 1.4550 | DIN X6CrNiNb18-10
Chemical composition of steel grade AISI 347 \| EN 1.4550 \| DIN X6CrNiNb18-10
C	Si	Mn	P	S	Cr	Ni	Nb	Fe
<0,08	<1,0	<2,0	<0,045	<0,015	17,0-19,0	9,0-12,0	<1,0	Other