02H8N22S6 Alloy (EP794)
Mark 02H8N22S6 applies to complex-austenitic steels. Production of such normalized TU: 14−1-1024−81; 14−1-3164−81; 14−1-3233−81; 14−1-3660−83; 14−1-3812−84; 14−1-3801−85; 14−1-5076−91. Smelted using plasma arc, vacuum arc melting, ESR (ESR). Welded serves as the basis of chemical reactors operating in contact with a 85% concentrated nitric acid in th t ° to 100 ° C.
The percentage of
|≤0,02||7.5 -1||5,4 -6,7||≤0,6||21 — 23||≤0,03||≤0,02||The basis|
The mechanical properties at 20 ° C
|assortment||TU||σ 0,2,||σ in,||δ 5||KCU,|
Fizicheskiesvoystva rolled high tº (grade Ø 15 mm, water quenching from 1050 ° C)
|es t, ° C||σ 0,2, N / mm²||σ in N / mm²||δ,%||KCU, J / cm 2||n, of||M cr, N · m|
The mechanical properties of the alloy at 20 ° C depending on the degree of cold deformation
|Art. Compression,%||σ 0,2, N / mm²||σ in N / mm²||δ,%||The degree of compression,%||σ 0,2, N / mm²||σ in N / mm²||δ,%|
Physical properties at t = 20 ° C
Density equals 7,7g / cm 3; modulus = 17.8 · 10 -4 N / mm 2; thermal conductivity = 0,134 · 10² W / (m · K).
The values of coefficient of linear thermal expansion (α) and the modulus of elasticity (E)
|es t, ° C||α · June 10, K -1||es t, ° C||E x 10 -4 N / mm 2|
According to TU and TU 14−1-3801−84 14−1-5076−91 02H8N22S6 steel resistant to intergranular corrosion after a 24-hour test in boiling 72% nitric acid solution. Before the test, the steel was subjected to 20 minutes of provoking heated to 600 ° C, followed by cooling in air.
The corrosion rate of steel in nitric acid
|HNO 3%||ν, mm / year, with tº||ν, mm / year, with tº||HNO 3%||ν, mm / year, with tº||ν, mm / year, with tº|
|90 ° C||100 ° C||90 ° C||100 ° C|
Note: The steel has a high resistance to stress corrosion cracking in a 42% solution of magnesium chloride.
Temperature interval of hot deformation of 1150−850 ° C. Both hot and cold, this steel is susceptible to forming. Tempering is carried out in water at t ° 1050 ° C; heating time and the exposure time is set at the rate of 2 min / mm thickness of the product. The same processing is applied to relieve work hardening and not only after hot plastic deformation, but also after cold deformation.
Welded via automatic or manual welding. For RDS used RLA-24 electrodes with a wire 02H17N14S4 brand. For automatic or manual TIG arc — recommended wire 02H8N22S6 brand. The rate of corrosion of welded joints in 98% HNO3 at 100 ° C = 0,22 mm / year. In order to prevent intergranular corrosion after welding parts must be subjected to quenching in water at t ° 1050 ° C.
Buy at the best price
OOO «Elektrovek-steel» sells a wide range of stainless steel. Our offices are located in Russia and Ukraine. Making a purchase is possible, without leaving the office, through the Company’s website. Technological equipment for each stage of production allows for individual orders, if the basic version product does not satisfy you. We make quality custom orders parameters, terms of their implementation are minimal. When wholesale purchases discounts.