|Designation GOST Cyrillic||08Г2ДНФЛ|
|Designation GOST Latin||08G2DHFL|
|By chemical elements||08Mn2CuНV|
08G2DNFL steel is used: for the manufacture of castings of large body parts; the upper parts of the frames of the crankcases, and beds of bearings, castings excavators heavy-duty and other sariaydin details high tensile strength; a variety of large parts for shipbuilding section up to 850 mm.
Cold-resistant, dispersion-hardening steel of pearlitic class.
|Castings with special properties (iron and steel)||В83||GOST 21357-87|
|Steel castings||В82||OST 5Р.9285-95, TU 108-11.973-88|
According to GOST 21357-87, the mass fraction of rare-earth metals (REM-yttrium, cerium, etc.) in steel should be in the range of 0.02-0.05%.
According to OST 5R.9285-95, the content of chromium up to 0.50% and molybdenum up to 0.12% is not a defect sign provided that the requirements of the standard are observed and if there are no special instructions in the technical conditions of the order or drawing. Vanadium is introduced by calculation.
In steel smelted in an open-hearth furnace, the carbon content is allowed not more than 0.12%, the content of sulfur and phosphorus is not more than 0.035% of each.
|sT|s0,2, MPa||σU, MPa||d||y, %||KCU, kJ/m2||HB, MPa|
|Castings for shipbuilding. 1-I Normalization at 930-970 °C + 2-I Normalization at 910-940 °C + vacation at 590-650 °C, air cooling|
|Castings for shipbuilding. Normalization at 930-970 °C + quenching in water from 910-940 °C + vacation at 590-650 °C, air cooling|
|Casting. Normalization at 930-970 °C, air cooling + normalization at 920-950 °C, air cooling + vacation at 590-630 °C, air cooling (KCU-60)|
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|
|d||Elongation after rupture|
|y||The relative narrowing|
|HB||Brinell hardness number|
|Weldability||welded without any restrictions. The welding process - SMAW. With a significant amount of welding it is recommended that subsequent vacation.|