Qualities

20X23H13 (AISI 309) sheet, strip and foil is made from heat-resistant high-alloy steel of the austenitic-ferritic class and is designed for parts operating at high temperatures of 900-1000 ° C in a slightly loaded condition. In contrast to the austenitic steels, grade 20Х23Н13 is characterized by higher strength (almost twofold), greater resistance to intergranular corrosion and corrosion cracking in chloride media and alkalis, greater heat resistance and heat resistance than the austenitic steel. Thanks to chromium and nickel, their surface is capable of self-repair when damaged. The relatively small percentage of nickel in the composition increases resistance in environments containing sulfur. Sheet and strip are limited weldable, requiring preheating to 100-120°C with a final heat treatment.

Manufacturing

Sheet, strip and foil are produced in accordance with the following requirements: thick sheets - GOST: 7350-77, 19 903-74 and 19 904-74, thin sheets - GOST 5582-75 and 19 904-74. Tape - GOST 4405-75 and 103-76. The products consist of 22-25% Cr, 12-15% Ni, up to 2% Mn, 1% Si, up to 0.3% Cu, 0.2% Ti and carbon, thousandths of a percent phosphorus and sulfur.

Percent composition of grade 20X23H13 (GOST 5632-72)

At t° 1050-1080°C sheets, strips and foils are rolled from, heated to plastic state blanks. Subsequent hardening strengthens the mechanical properties, increases strength and hardness, but the ductility properties are lost. The higher the work hardening coefficient, the stronger the strip and sheet.

Mechanical properties of rolled products at^{to 20o} C

_σB - short-term tensile strength;

_σT - yield strength for permanent deformation.

Each sheet undergoes several stages of production aimed at improving its qualities. The most important stage is considered to be the cooling process. New thick plate mills cool the plate by moving it with roller conveyors, conveyor belts and slappers. Older mills cool the finished product in stacks or shop plates. The sheets in the stacks undergo additional heat treatment - self-tempering - which makes them longer. Sheet and strip undergo accelerated cooling before impact toughness testing - the surface of the sheet is sprayed with water and blown with air. This increases strength at sub-zero temperatures.

Classification

Tape, sheet are classified according to the method of processing, type and quality of surface, type of edges and manufacturing accuracy.

Application

Band, sheet are used in the manufacture of various containers that are operated under high pressure in the construction, medical, food industry, chemical, petrochemical, shipbuilding industry. Sheet, strip or tube 20X23H13, can replace products of steel grades 309S, 309H, 309Cb, 309HCb, not inferior to their properties.

Supply

Supplied rolled steel grade 20X23H13 (AISI 309) is certified. The technical documentation includes data on the chemical composition, the limiting percentage of impurities, the mechanical properties of products. From us you can buy in bulk any semi-finished products for large-scale productions. We also offer optimum conditions for retail buyers. High level of service and prompt service is the face of our company.

Buy at the best price

Evek GmbH has an unlimited range of stainless alloys of the highest quality. We offer special alloys at an optimal price. If you are interested in our offer, please contact your nearest office. Qualified specialists will provide all necessary information regarding products, price range, sales conditions. The cost of goods depends on the parameters of products and additional terms of delivery.