Alloy 36NKH (ЭП713)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
36НХ |
| Designation GOST Latin |
36HX |
| Transliteration |
36NH |
| The chemical elements |
36NiCr |
| Name |
The value |
| Designation GOST Cyrillic |
ЭП713 |
| Designation GOST Latin |
EP713 |
| Transliteration |
EhP713 |
| The chemical elements |
- |
Description
Alloy 36NKH used: for the production of billets ragged, made the free forging on presses or RCM and intended for the manufacture of tubes; manufacture of structures and pipelines operating at low temperatures.
Standards
| Name |
Code |
Standards |
| Classification, nomenclature and general norms |
В30 |
GOST 10994-74 |
| Bulls. Blanks. Slabs |
В31 |
TU 14-1-2526-78, TU 14-1-2543-78 |
| Sectional and shaped rolling |
В32 |
TU 14-11-245-88 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
| TU 14-1-2526-78 |
≤0.05 |
≤0.02 |
≤0.02 |
0.3-0.6 |
0.4-0.6 |
≤0.3 |
35-37 |
The rest |
≤0.25 |
| GOST 10994-74 |
≤0.05 |
≤0.015 |
≤0.015 |
0.3-0.6 |
0.4-0.6 |
≤0.3 |
35-37 |
The rest |
≤0.25 |
Fe is the basis.
According to GOST 10994-74 the chemical composition is presented for the 36NX alloy (EP713).
TU 14-1-2526-78 chemical composition is presented for the alloy grade 36NH-SH (EP713-SH). In the finished metal, deviations are allowed for the content of manganese and chromium - (minus) 0.10% for each element.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
| Tubular billet on the other 14-1-2526-78. Heating to 850-900 °C (exposure for 15 minutes), air cooling or furnace (longitudinal samples) |
| 20-25 |
≥196 |
≥390 |
≥38 |
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 |
Technological properties
| Name |
The value |
| Pressure treatment |
Clan and the ratio of the extrusion billet according to TU 14-1-2526-78 should be not less than 2.8 in terms of the sizes of the cross sections of the ingot and workpiece. |
| Macrostructure and contamination |
In the macrostructure of the workpiece in the state of delivery should be free of cracks, gas bubbles, subcortical bubbles, Samorodov crust, delamination, traces of shrinkage and slag inclusions visible to the naked eye. The degree of development of the Central porosity, point heterogeneity and phase separation of the square in points should not exceed 1 score. The alloy is checked on the contamination of non-metallic inclusions. The norm of non-metallic inclusions by the maximum score should not exceed: - oxides, stroke is 1.5; the oxides of point - 2,0; - silicates fragile - 1.5, and - silicates plastic - 1,5; the non - deformed silicates - 1,5; - sulphides - 1,0; - nitrides and carbonitrides and 3.0. |
| Temperature coefficient of linear expansion |
According to GOST 10994-74 CTE (1.0 to 2.0)·10-6 deg-1 in the temperature range 20÷100 °C and from plus 20 to minus 258 °C. On the other 14-1-2526-78 CTE (0,6-2,2)·10-6 deg-1 in the temperature range 20÷100 °C. |
