Steel 15Х16Н2АМ (ЭП479)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
15Х16Н2АМ |
| Designation GOST Latin |
15X16H2AM |
| Transliteration |
15H16N2AM |
| The chemical elements |
15Cr16Н2NMo |
| Name |
The value |
| Designation GOST Cyrillic |
ЭП479 |
| Designation GOST Latin |
EP479 |
| Transliteration |
EhP479 |
| The chemical elements |
- |
Description
15Х16Н2АМ steel is used: for the manufacture of structural shapes, and forgings intended for subsequent cold machining or hot for subsequent machining (stamping, forging, rolling, etc.) in the manufacture of machine parts; nitride of parts for the aircraft industry; special fasteners and pipeline components for aircraft (bolts, nuts, plugs, angles, tees, pohodnikov, tubes, fittings, etc.).
Note
Corrosion-resistant case hardening steel of the martensitic class.
Standards
| Name |
Code |
Standards |
| Classification, nomenclature and general norms |
В20 |
OST 1 90005-91 |
| Metal forming. Forgings |
В03 |
TU 14-1-1530-75 |
| Sectional and shaped rolling |
В32 |
TU 14-1-3575-83, TU 14-1-948-74, TU 14-1-1434-75 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
N |
Mo |
| TU 14-1-1434-75 |
0.12-0.18 |
≤0.02 |
≤0.03 |
≤0.6 |
15-16.5 |
≤0.6 |
2-2.5 |
The rest |
0.03-0.1 |
0.9-1.3 |
Fe is the basis.
According to TU 14-1-948-74, the chemical composition is given for steel grade 15H16N2AM-SH (EP479-SH). In the finished rolled steel, subject to the requirements of TU 14-1-948-74, deviation from the chemical composition standards is allowed: by carbon ± 0.010%, manganese ± 0.020%, silicon ± 0.020%, chromium ± 0.050%, nickel -0.050%, molybdenum ± 0.020%.
According to TU 14-1-1434-75 the chemical composition is given for steel grade 15H16N2AM-SH (EP479-Ш). In ready rolled products, deviation from the chemical composition standards is allowed: carbon ± 0.010%, manganese + 0.020%, silicon + 0.020%, chromium ± 0.050%, nickel -0.050%, molybdenum ± 0.020%. The content of residual elements must comply with GOST 5632.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
Brinell hardness number, MPa |
HRC |
| Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91 |
| - |
- |
880-1030 |
- |
- |
- |
262-302 |
23-33 |
| - |
- |
- |
- |
- |
- |
341-478 |
37-49.5 |
| Bars hot rolled and forged on the other 14-1-948-74. Quenching in oil with 1030-1040 °C + Vacation at 550-590 °C |
| 20-25 |
≥930 |
≥1130 |
≥12 |
≥58 |
≥687 |
294-376 |
- |
| Bars with special surface finish on the other 14-1-1434-75. Quenching in oil with 1030-1050 °C + Vacation at 640-680 °C |
|
≥735 |
≥930 |
≥14 |
≥55 |
≥690 |
277-341 |
- |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σB |
Limit short-term strength |
| d5 |
Elongation after rupture |
| y |
The relative narrowing |
| kJ/m2 |
Toughness |
| HRC |
Rockwell hardness (indenter diamond spheroconical) |
Technological properties
| Name |
The value |
| Macrostructure and contamination |
The macrostructure of the steel on the other 14-1-948-74 when checking on the etched templeto should not have voids, cracks, fractures, delaminations, and inclusions that are visible to the naked eye. Evaluation of the macrostructure is produced according to the methods and scales GOST 10243. The degree of development of a point inhomogeneity, Central porosity, phase separation and square podsadecki segregation should not exceed the 1st score of the scales according to GOST 10243. The degree of development of layer-by-layer crystallization and light circuit shall not exceed 3 points scales according to GOST 10243. Other defects, classified according to GOST 10243 are not allowed. |
| Microstructure |
The control metal on volosovichi is made by the consumer in the finished product on the other 14-1-336-72. |
| Features of production |
Bars hot rolled and forged on the other 14-1-948-74 are supplied in heat treated condition with a hardness on the Brinell hardness of not more than 294 (indentation diameter not less than 3.55 mm). Depending on the purpose hot rolled and forged steel are divided into subgroups: a - for hot processing by pressure; "b" for cold machining. At the request of the enterprises of the aviation industry, specified in the order, the steel sub-group "a" supply plant "Dneprospetsstal" test on the residue in the hot state, up to 1/3 of the height. In upset samples should be free of tears and cracks. Bars with a diameter or a side of a square more than 80 mm on the hot draught can not be tested at the plant of the supplier, if the latter guarantees a positive result of this test from the consumer. |
