|Designation GOST Cyrillic||20ГСНДМЛ|
|Designation GOST Latin||20GCHDML|
|By chemical elements||20MnСНCuMo|
20ГСНДМЛ steel is used: for the manufacture of shaped castings of complex shape responsible different loaded parts shipbuilding with wall thickness up to 130 mm; the component elements of the anchor chains (swivels, shackles), operated in sea water under the influence of significant static and cyclic loads; parts operating at low temperatures.
Dispersion-hardening steel of pearlitic class.
|Steel castings||В82||OST 5Р.9285-95|
According to OST 5R.9285-95, the chromium content up to 0.50% is not a defect condition 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.
According to OST 5R.9285-95, in the case of steel smelted in the main electric furnaces as cold-resistant (technical conditions of the order or requirements of the drawing), the sulfur and phosphorus content should not be more than 0.020% of each. As agreed by the manufacturer with the developer OST 5P.9285-95 (CRI "Prometey"), the content of sulfur and phosphorus is allowed up to 0.030% of each.
In steel, tungsten can be replaced with molybdenum, and the content of tungsten can be reduced provided that the required mechanical properties of the steel are ensured.
|sT|s0,2, MPa||σU, MPa||d||y, %||KCU, kJ/m2||HB, MPa|
|Castings for shipbuilding. Normalization at 950-980 °C + quenching in water from 920-950 °C + vacation at 600-650 °C, cooling in water|
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.|