Steel 27ХН3М2ФА (27ХН3М2Ф)
Designation
| Name | The value |
|---|---|
| Designation GOST Cyrillic | 27ХН3М2ФА |
| Designation GOST Latin | 27XH3M2FA |
| Transliteration | 27HN3M2FA |
| By chemical elements | 27CrН3Mo2V |
| Name | The value |
|---|---|
| Designation GOST Cyrillic | 27ХН3М2Ф |
| Designation GOST Latin | 27XH3M2F |
| Transliteration | 27HN3M2F |
| By chemical elements | 27CrН3Mo2V |
Description
27ХН3М2ФА steel is used: for the manufacture of forgings of shafts of compressors and gas turbines.
Standards
| Name | Code | Standards |
|---|---|---|
| Blanks. Of the workpiece. Slabs | В31 | TU 108.11.389-87, TU НЗЛ 341-93 |
| Processing of metals by pressure. Forgings | В03 | TU НЗЛ 342-89 |
Chemical composition
| Standard | C | S | P | Mn | Cr | Si | Ni | Fe | Cu | V | Mo |
|---|---|---|---|---|---|---|---|---|---|---|---|
| TU 108.11.389-87 | 0.24-0.3 | ≤0.02 | ≤0.02 | 0.2-0.6 | 1.35-1.75 | 0.17-0.37 | 3.25-3.75 | Rest | ≤0.3 | 0.08-0.18 | 0.45-0.6 |
| TU НЗЛ 342-89 | 0.24-0.3 | ≤0.02 | ≤0.02 | 0.2-0.45 | 1.35-1.75 | 0.17-0.37 | 3.25-3.75 | Rest | ≤0.3 | 0.08-0.18 | 0.45-0.6 |
Fe is the basis.
According to TU NZL 342-89 the chemical composition is given for steel grade 27HN3M2FA. For the steel of electroslag remelting 27ХН3М2ФА-Ш, manganese content in the range of 0.20-0.60% is allowed.
According to TU 108.11.389-87, the chemical composition is given for steel grade 27HN3M2FA of the initial melting produced in open-hearth or electric-arc furnaces with subsequent processing at the out-of-furnace refining and vacuuming plant (the casting is carried out in a vacuum). It is allowed to smelt the parent metal in a sour open-hearth furnace by a duplex process or in the main electric arc furnace with a vacuum casting. Deviations in chemical composition are allowed: by carbon ± 0.010%, by silicon ± 0.020%, by manganese ± 0.020%, by molybdenum ± 0.020%, by chromium ± 0.050%, by nickel -0.10%, by vanadium +0.020%. After the ESR, a determination of sulfur is made, which should not be more than 0.015%.
According to TU NZL 342-89 the chemical composition is given for steel grade 27HN3M2FA. For the steel of electroslag remelting 27ХН3М2ФА-Ш, manganese content in the range of 0.20-0.60% is allowed.
According to TU 108.11.389-87, the chemical composition is given for steel grade 27HN3M2FA of the initial melting produced in open-hearth or electric-arc furnaces with subsequent processing at the out-of-furnace refining and vacuuming plant (the casting is carried out in a vacuum). It is allowed to smelt the parent metal in a sour open-hearth furnace by a duplex process or in the main electric arc furnace with a vacuum casting. Deviations in chemical composition are allowed: by carbon ± 0.010%, by silicon ± 0.020%, by manganese ± 0.020%, by molybdenum ± 0.020%, by chromium ± 0.050%, by nickel -0.10%, by vanadium +0.020%. After the ESR, a determination of sulfur is made, which should not be more than 0.015%.
Mechanical properties
| Section, mm | sT|s0,2, MPa | σU, MPa | d5, % | y, % | KCU, kJ/m2 |
|---|---|---|---|---|---|
| Forged billet shafts of compressors and gas turbines, heat-treated in the delivery condition on the other NZL 342-89 (longitudinal samples, in the column of the delivery condition specified strength) | |||||
| ≤550 | 687-883 | ≥803 | ≥14 | ≥35 | ≥490 |
| ≤500 | 736-931 | ≥852 | ≥13 | ≥35 | ≥490 |
Description mechanical marks
| Name | Description |
|---|---|
| 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 |
| KCU | Toughness |
Technological properties
| Name | The value |
|---|---|
| Weldability | Difficult weldability. |
| The tendency to temper brittleness | Malosolone. |
| The temperature of forging | Start - 1200 °C, the end of - 900 °C. |
| Flock-sensitive sensitivity | A highly sensitive. |
