Characteristics

02Х25Н22АМ2-ПТ grade refers to highly alloyed austenitic steels. It is melted in plasma furnaces using pure charge materials. Production is regulated by the following specifications: 14−134−277−91; 14−1-5072−91; 14−1-5203−93; 14−159−252−95.This is a particularly low-carbon nitrogen-bearing structurally stable steel. It is used in the manufacture of urea production equipment at pressures ≤ 200 ^N/mm2 and t° from -70° to +200°С. Exceptional strength and corrosion resistance allows to use this steel instead of 03Х17Н14МЗ that provides reduction of metal intensity of equipment, increases reliability and service life. It is also advisable to use this steel for operation in phosphoric, nitrogen- and sulfuric acid environments and instead of Х17Н14М2Т or Х17Н14М3Т grades under conditions conducive to the appearance of pitting corrosion. This steel is used for operation in environments containing hydrogen sulphide with partial pressure _H2 S ≤ 3,0 N/mm or _CO2 ≤ 30 ^N/mm2 at t° up to 150 °C.

Percentage composition

Mechanical properties at 20 ° C

Mechanical properties at low as well as elevated tº (grade Ø 40 mm, hot rolled)

Note to this table: impact toughness after the quenching process from t 1100 °C. Samples did not fracture.

Mechanical properties at sufficiently high tº (grade Ø 40 mm)

Physical Properties

The density of steel is 7.98 ^g/cm3.

Temperature coefficient of linear expansion α

Corrosion resistance

According to the following TU 14−159−252−95, 14−1-5203−93 steel is supplied after quenching at t ° 1100 ° C without provoking tempering. Resistant to intergranular corrosion when tested by DU GOST 6032−89 in boiling 65% _HNO3, 5 cycles of 48 hours. The rate of corrosion after each of the cycles does not exceed 0.3 mm / year. According to TU. 14−1-5072−91 bar stock and TU 14−134−277−91 (tube billets) shall meet the above requirements. The susceptibility to intergranular corrosion is tested on samples after heat treatment (at t ° 1100 ° C ± 10 ° C, cooling in the air, without provoking tempering).

The susceptibility to corrosion — samples cut from grade Ø 40 mm (the value in the numerator) and Ø 120 mm (the value in the denominator) when tested by the method of DU

Steel resists intergranular corrosion when tested by the method, GOST 6032−89, after a 5-hour tempering at t ° 600−800 ° C. Welded joints are not prone to intergranular corrosion, including knife-type corrosion in a solution of 40% HNO3 + 2% HF (at 95 ° C, for 48 hours). This steel has high resistance to local types of corrosion (pitting, crevice corrosion in chloride-rich media), as well as to corrosion cracking in hydrogen sulphide-containing media.

Process parameters

This steel is high-tech, available hot and cold plastic deformation. The temperature range of hot deformation is 1230−980°C. Hardening is carried out at t° up to 1100±10°С with cooling in water. The same heat treatment is used for debinding, both after hot and cold deformation. In the hot-rolled state the steel structure is austenitic fine-grained (#9−10); there is almost no ferrite (<0.5%). The metal itself is clean in terms of non-metallic inclusions. Recrystallization of austenite grains in the samples of flat steel goes during heating to 1100 ° C, after aging the structure of flat steel has a grain size of number 7-8.

Welding

The manual argon arc method with the help of additive wire Sv-01H23N23MZTZ. Seams are not prone to intergranular, knife corrosion when operated in oxidizing environments.

Delivery

Evek GmbH has a wide range of rolled products of 02Х25Н22АМ2-PТ grade of any parameters in stock. The technical documentation includes data on the chemical composition, the limiting percentage of impurities; mechanical properties of the products. From us you can buy in bulk any semi-finished products for large-scale productions. We also offer optimum conditions for retail buyers. The high level of service and responsiveness of service is the face of our company.

Buy at the best price

Evek GmbH has an unlimited assortment of stainless steel 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.