Designation
| Name |
The value |
| Designation GOST Cyrillic |
20ХФА |
| Designation GOST Latin |
20XFA |
| Transliteration |
20HFA |
| By chemical elements |
20CrV |
| Name |
The value |
| Designation GOST Cyrillic |
20ХФ |
| Designation GOST Latin |
20XF |
| Transliteration |
20HF |
| By chemical elements |
20CrV |
Description
20ХФА steel is used: for the manufacture of seamless hot-deformed pipes with improved corrosion and cold-resistance (article 20ХФА), with an outer diameter from 89 to 426 mm, strength class not less than K54, infield pipelines, transporting products of oil wells (high-pressure conduits at a pressure of 24.0 MPa).
Note
Structural alloy steel of high corrosion resistance and cold-resistance.
Standards
| Name |
Code |
Standards |
| Steel pipes and fittings to them |
В62 |
TU 1317-006.1-593377520-2003 |
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, MPa |
d5, % |
KCU, kJ/m2 |
HRB |
| Seamless tubes gas & oil heat-treated in the delivery condition on the other 1317-006.1-593377520-2003 (samples in the delivery condition specified strength class, in the column the value is KCU KCV-50 °C) |
| 89-426 |
383-510 |
≥530 |
≥23 |
≥980 |
≤92 |
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 |
| KCU |
Toughness |
| HRB |
Rockwell hardness (indenter steel, spherical) |
Physical characteristics
| Temperature |
a, 10-6 1/°C |
| 100 |
12 |
A description of the physical symbols
| Name |
Description |
| Е |
The normal elasticity modulus |
| r |
Density |
| l |
Coefficient of thermal conductivity |
| R |
UD. the resistivity |
Technological properties
| Name |
The value |
| Склонность к отпускной хрупкости |
Malosolone. |
| Flock-sensitive sensitivity |
Insensitive. |
| Corrosion resistance |
In the medium H2S: speed General corrosion ≤ 0.3 mm/year; resistance to hydrogen cracking, CLR = 0 % CTR = 0 %; resistant to sulfide corrosion stress cracking ≥ 80 % of σ0,2. |
