Stainless Steel Grade AISI 305 | EN 1.4303

Stainless steel AISI 305 | EN 1.4303 | DIN X4CrNi18-12 is a chromium-nickel austenitic stainless steel with a low degree of strain hardening due to the increased nickel content. This alloy is well suited for multi-stage deep drawing without process annealing. The metal of this stainless steel is non-magnetic under annealing and cold working conditions and has corrosion resistance similar to stainless steel AISI 304, AISI 304L.

Physical properties

Table No. 1: physical properties of stainless steel grade AISI 305 | EN 1.4303 | DIN X4CrNi18-12
Density g/cm³	7,9
*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
Magnetic properties	non-magnetic

Table No. 2: physical properties of stainless steel grade AISI 305 | EN 1.4303 | DIN X4CrNi18-12
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

Technological properties

⓵ Welding

AISI 305 / EN 1.4303 can be welded with or without filler. It is easier to weld when using filler. Stainless steel grade AISI 308L is recommended as the preferred filler. The interval temperature should not exceed 150 °C. No post weld heat treatment is required. Any tint or heat resulting from welding or high temperature treatment must be either mechanically or chemically removed, followed by a suitable passivation treatment to restore corrosion resistance.

⓶ Forging

The steel must be heated slowly to a temperature range of 1150 °C - 1200 °C to ensure forging. Forging takes place at temperatures between 1200 °C and 900 °C. Forging is followed by air cooling or water quenching when there is no risk of distortion.

⓷ Processing

Due to the more stable austenite structure of EN 1.4303, it exhibits a lower tendency to harden during mechanical processing.

Mechanical properties

Table: mechanical properties of stainless steel grade AISI 305 | EN 1.4303 | DIN X4CrNi18-12
Tensile strength, min., MPa	485
Yield strength, 0.2%, MPa	170
Relative elongation, min., %	40
Hardness HB	215

Corrosion resistance

Although this grade of stainless steel is subject to intergranular corrosion under welding conditions according to standards, the lower carbon content achieved in practice means that AISI 305 has virtually no tendency to form chromium carbides and the associated chromium areas that form around these deposits. This steel is resistant to corrosion in most natural waters and in urban and rural atmospheres, provided that the chloride and salt content is low. This steel is not resistant to sea water. It should not be used in any applications involving sea water. Like AISI 304L, this steel is not recommended for use in swimming pools.

Table: chemical composition of steel grade AISI 305 | EN 1.4303 | DIN X4CrNi18-12
Chemical composition of steel grade AISI 305 \| EN 1.4303 \| DIN X4CrNi18-12
C	Si	Mn	P	S	Cr	Ni	N	Fe
<0,06	<1,00	<2,00	<0,045	<0,015	17,0-19,0	11,0-13,0	<0,10	Other