|Designation GOST Cyrillic||16ГНМА|
|Designation GOST Latin||16GHMA|
|By chemical elements||16MnНMo|
16ГНМА steel is used: for the manufacture of parts such as bottoms, collar flanges, fittings, rings, tubes, tees, drums of high-pressure boilers and parts of rectangular shape for power equipment and pipelines with an absolute pressure of more than 3.9 MPa, thermal power plants.
Carbon structural steel high quality.
|Processing of metals by pressure. Forgings||В03||OST 108.030.113-87|
|Sheets and strips||В33||OST 108.030.118-78|
According to OST 108.030.118-78 the casting composition of steel grade 16GNMA is given. When smelting steel allowed deviations in the chemical composition: nickel, silicon, chromium and manganese ± 0.050% each. When steel is smelted as a technological additive, ferrovanadium is added at 0.020-0.030% by calculation. In the finished rolled metal under the control chemical analysis of the metal, deviations from the chemical composition standards are allowed in accordance with GOST 19281. The manufacturer guarantees the arsenic content (As) not more than 0.080% and nitrogen (N) not more than 0.0080%.
|Section, mm||sT|s0,2, MPa||σU, MPa||d5, %||y, %||KCU, kJ/m2|
|Rolled sheet with a thickness of 115 mm for OST 108.030.118-78. The transverse samples. Normalization at 930±10 °C (extract 1 min per 1 mm thickness), cooling for extended hearth or air + Vacation at 630-670 °C (exposure 6 minutes per 1 mm thickness), cooling with the oven up to 400 °C at a speed of not more than 50°C/hour, then air cooling|
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|
|d5||Elongation after rupture|
|y||The relative narrowing|
|Macrostructure and pollution||The macrostructure of the steel on the etched templeto visual inspection should not have delamination, placenow, shrinkage looseness. Allowed separate volosovichi and non-metallic inclusions is no longer than 15 mm. the Macrostructure of the investigated template should be compared with the sulfur prints, thus, discovered on microtemplate strokes of any length, coinciding with liquate-services clusters in sulfur print, the discontinuities (layers, flocs, golosovanie) are not considered. The degree of phase separation homogeneity and density of the metal are characterized by sulfur print, which should correspond to the points 1-4 of sulfur prints made of carbon steel and alloy steel approved Intimacies.|