Stainless Steel Grade AISI 202 | EN 1.4373 | DIN X12CrMnNiN18-9-5

AISI 202 | EN 1.4373 | DIN X12CrMnNiN18-9-5 is a widely used grade of stainless steel that is characterized by high hardness, strength and good corrosion resistance. It is quite well processed in annealed condition. For complete transformation and heat treatment, the material must be heated to a temperature of 1038 °C for 30 minutes and then cooled to below 16 °C.

Physical properties

Table No. 1: Physical properties of stainless steel grade AISI 202 | EN 1.4373 | DIN X12CrMnNiN18-9-5
*Thermal conductivity at +20°C, W/mK**	15
*Specific electrical resistance at +20°C, μOhmm**	0,73
Density g/cm³	7,8
Magnetic properties	non-magnetic

Table No. 2: Physical properties of stainless steel grade AISI 202 | EN 1.4373 | DIN X12CrMnNiN18-9-5
Temperature	+20°С	+100°С	+200°C	+300°С	+400°С	+500°С
Modulus of elasticity, GPa	200	194	186	179	172	165

Technological properties

⓵ Welding

AISI 202 stainless steel has excellent weldability and is suitable for the full range of conventional welding methods (e.g. MMA, MIG, MAG, TIG, SAW, LBW or RSW), with the exception of gas welding. It has 50% higher thermal expansion and lower thermal conductivity compared to carbon steels. This means that greater deformations and higher shrinkage loads can occur as a result of welding.

For thin parts, autogenous welding can be used. To ensure that the properties of the weld metal (e.g. strength and corrosion resistance) are equivalent to those of the parent metal, appropriate or common fillers should be used.

After welding, heat treatment is generally not required. In special cases, where there is a risk of cracking, heat treatment is used.

Important: To fully restore the corrosion resistance of the weld, the scale from the welds must be removed by etching, passivation and polishing.

⓶ Corrosion resistance

AISI 202 has excellent corrosion resistance in solutions of many halogenated organic and inorganic compounds at a wide temperature and concentration range. It can withstand many organic and sufficiently diluted mineral acids, depending on the solution temperature. It can "suffer" from uniform corrosion of mineral acids and hot strong alkaline solutions. It is suitable, for example, for the manufacture of cookware. Steel 202 can withstand even relatively high chloride concentrations. It is subject to corrosion depending on the chloride in the environment. It can be used for indoor and outdoor applications in rural and urban areas where chloride pollution is low.

Mechanical properties

Table: mechanical properties of stainless steel grade AISI 202 | EN 1.4373 | DIN X12CrMnNiN18-9-5
Tensile strength Rm ≥ N/mm²	600 - 800
Yield strength Rp ≥ N/mm²	320 - 340
Relative elongation A5 ≥ %	35 - 45

Table: chemical composition of steel grade AISI 202 | EN 1.4373 | DIN X12CrMnNiN18-9-5
Chemical composition of steel grade AISI 202 \| EN 1.4373 \| DIN X12CrMnNiN18-9-5
C	Si	Mn	P	S	Cr	Ni	N	Fe
<0,15	<1,00	7,5-10,5	<0,045	<0,015	17,0-19,0	4,0-6,0	0,05-0,25	Other

Applications

It is used in the food industry for the production of household kitchen utensils: being a relatively inexpensive substitute for stainless steel grade AISI 304, this steel has proven itself as a material for the production of metal utensils and household kitchen utensils (small utensils, medium and deep draw, kitchen and cutting tables, water containers, knives for cutting food, thermoses and flasks, water storage containers, etc.). It is widely used for the production of structural elements and equipment for the food industry.