Steel 02Н18К9М5Т (ЭП637А; VKS-210)
|Designation GOST Cyrillic||02Н18К9М5Т|
|Designation GOST Latin||02H18K9M5T|
|By chemical elements||02Н18Co9Mo5Ti|
|Designation GOST Cyrillic||ЭП637А|
|Designation GOST Latin||EP637A|
|By chemical elements||-|
|Designation GOST Cyrillic||ВКС-210|
|Designation GOST Latin||BKC-210|
|By chemical elements||WCoС-210|
02Н18К9М5Т steel is used: for the production of bodies of rocket motors, shafts, and other parts of aircraft engines, welded hulls, engines, gears, engines, parts artillery and infantry guns, hulls of submarines, submersibles, vessels large volumes of work at high pressure, highly loaded disks of turbomachines, gear wheels, spindles, parts of the worm pairs.
Maraging high-alloy steel with higher structural stability in the interval of temperatures from cryogenic to 500 °C.
|Bars and shapes||В22||GOST 1133-71, GOST 2590-2006, GOST 2591-2006|
|Sheets and strips||В33||GOST 4405-75|
|Classification, nomenclature and General rules||В20||OST 1 90005-91|
|Processing of metals by pressure. Forgings||В03||TU 14-1-1530-75|
|Bars and shapes||В32||TU 14-1-3039-80, TU 14-1-3051-80, TU 14-1-4211-87, TU 14-1-4896-90|
According to TU 14-1-4896-90 and TU 14-1-4211-87, the chemical composition is given for steel grade 02N18K9M5T-ID (EP637A-ID).
According to TU 14-1-4211-87 deviations from the chemical composition are allowed: for silicon and manganese, provided that their amount will not be more than 0.20%; by sulfur and phosphorus, provided that their sum is not more than 0.020%, for nickel minus 0.20%. A residual chromium content of up to 0.30% is allowed. Estimated content of modifiers and deoxidizers - magnesium, cerium, hafnium, germanium, boron, etc. is established by the supplier's technological instructions and their residual content in the metal is not determined by chemical analysis.
According to TU 14-1-3039-80 the chemical composition is given for steel grade 02N18K9M5T-EL (EP637A-EL). The calculated content of modifiers and deoxidizers: magnesium, hafnium, cerium, germanium and boron is established by the supplier's technological instructions and their residual content in the metal is not determined by chemical analysis. In the finished product, deviations in the sweat of the norms of the chemical composition are allowed: nickel -0.20%, silicon and manganese - not regulated, but the amount of their content should not exceed 0.20% sulfur and phosphorus - not regulated, but the amount of their content is not should exceed 0.020%. The residual chromium content should not exceed 0.30%.
|Section, mm||sT|s0,2, MPa||σU, MPa||y, %||KCU, kJ/m2||HRC|
|Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91|
|Bars and rods, hot-rolled 02Н18К9М5Т-EL (ЭП637А-EL, ВКС210-EL) on the other 14-1-3039-80. Annealing in air 780-820 °C (aging 1 HR) + Aging at 500-520 °C (extract 3 hours), air cooling|
|The wrought-iron bars on the other 14-1-4211-87. Quenching in water with 1170-1220 °C (exposure 1-2 h) + 3-fold quenching in water from 900-930 °C (exposure 1-2 h) + Annealing in air or in water 780-820 °C (exposure 1-2 h) + Aging at 500-540 °C (delay of 2-5 h), air cooling (in the column of the delivery condition specified cut direction samples)|
Description mechanical marks
|sT|s0,2||Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%|
|σU||Limit short-term strength|
|y||The relative narrowing|
|HRC||Rockwell hardness (indenter diamond spheroconical)|
|Macrostructure and pollution||The macrostructure of the steel on the other 14-1-3039-80 should not have shrinkage and looseness, bubbles, cracks, inclusions, crusts, delamination and placenow visible without using the magnifying devices.|