|Designation GOST Cyrillic||30Х2Н2ВФМА|
|Designation GOST Latin||30X2H2BFMA|
|By chemical elements||30Cr2Н2WVMo|
30Х2Н2ВФМА steel is used: for the production of hot rolled bars with diameter and side of a square of 300 mm and forged bars sizes up to 200 mm, intended for the subsequent manufacture of critical parts of high strength and toughness, working in conditions of alternating loads (crankshafts, gears, connecting rods, etc.).
Alloy structural steel high quality. Steel is smelted in open furnaces (30Х2Н2ВФМА) or by electroslag remelting (30Х2Н2ВФМА-W).
|Classification, nomenclature and General rules||В20||OST 1 90005-91|
|Bars and shapes||В32||TU 14-1-2847-79|
According to TU 14-1-2847-79 the chemical composition is given for steel 30Х2Н2ВФМА. Limit content of residual copper should not exceed 0.25%. For steel 30Х2Н2ВФМА-Ш the sulfur content should not be more than 0,012%, phosphorus - not more than 0,020%. In the finished rolled steel, subject to compliance with the requirements of these specifications, deviation from the chemical composition in accordance with Table 2 TU 14-1-950-86 with the following addition is allowed: for steel 30Х2Н2ВФМА-Ш deviation in silicon ± 0,050%. In steel, a partial replacement of tungsten with residual molybdenum is allowed, from the calculation: one part of molybdenum replaces three parts by weight of tungsten, with tungsten in steel not less than 0.60%.
|Section, mm||sT|s0,2, MPa||σU, MPa||d5, %||y, %||KCU, kJ/m2||HB, MPa||HRC|
|Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91|
|Bars hot rolled and forged steel 30Х2Н2ВФМА and 30Х2Н2ВФМА-ø in delivery condition on the other 14-1-2847-79. Quenching in oil from 900±10 °C + Vacation at 550-600 °C|
|Bars hot rolled and forged steel 30Х2Н2ВФМА and 30Х2Н2ВФМА-ø in delivery condition on the other 14-1-2847-79. Quenching in oil from 900±10 °C + Vacation at 600-650 °C|
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|
|HB||Brinell hardness number|
|HRC||Rockwell hardness (indenter diamond spheroconical)|
|Macrostructure and pollution||The macrostructure of the steel on the other 14-1-2847-79 detected in fractures and treated templeto should not have non-metallic inclusions visible to the naked eye, podnasadochnogo looseness, blistering, delamination, cracks and placenow. Iancc quality steel macrostructure is produced on a scale of standards according to the GOST 10243. On templeto taken from the finished grade, the degree of development of a point inhomogeneity, the Central porosity and phase separation of the square should not exceed the first score of the scales GOST 10243 for steel grade 30Х2н2ВФМА-W and second mark for the grade steel 30Х2Н2ВФМА. Layer-by-layer crystallization and the light circuit must not exceed 3 points GOST 10243. The remaining defects are classified GOST 10243, are not allowed.|
|Particularities of production of goods||On the other 14-1-2847-79 hot rolled and forged steel is delivered in thermally treated condition (annealed or vysokoopasnye). The bars as supplied should have a hardness on the Brinell hardness (indentation diameter) of not less than 3.8 mm|