Steel 30KH13N7S2 (ЭИ72)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
30Х13Н7С2 |
| Designation GOST Latin |
30X13H7C2 |
| Transliteration |
30H13N7S2 |
| The chemical elements |
30Cr13Н7С2 |
| Name |
The value |
| Designation GOST Cyrillic |
ЭИ72 |
| Designation GOST Latin |
EI72 |
| Transliteration |
EhI72 |
| The chemical elements |
- |
Description
30KH13N7S2 steel is used: for the production of valves of automobile engines; for the production of various high temperature parts of aviation.
Note
Steel heat-resistant martensitic class.
Temperature intense scaling in air +950 °C.
Stable in sulfur-containing environments.
Standards
| Name |
Code |
Standards |
| Classification, nomenclature and general norms |
В30 |
GOST 5632-72 |
| Sectional and shaped rolling |
В32 |
GOST 5949-75, TU 14-1-377-72, TU 14-1-3957-85, TU 14-11-245-88 |
| Bulls. Blanks. Slabs |
В21 |
OST 1 90176-75 |
| Bulls. Blanks. Slabs |
В31 |
OST 3-1686-90 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Ti |
Mo |
W |
| GOST 5632-72 |
0.25-0.34 |
≤0.025 |
≤0.03 |
≤0.8 |
12-14 |
2-3 |
6-7.5 |
The rest |
≤0.3 |
≤0.2 |
≤0.2 |
≤0.3 |
≤0.2 |
Fe is the basis.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
Brinell hardness number, MPa |
| Bars hot rolled and forged GOST 5949-75 and Forming at OST 1 90176-75. Quenching in water from 1040-1060 °C + Annealing at 860-880 °C (exposure 6 h), cooled to 700 °C for 2 hours, then - with oven + Normalization at 660-680 °C (aging of 0.5 h), air cooling + Tempering in oil 790-810 °C |
|
≥785 |
≥1177 |
≥10 |
≥25 |
≥196 |
341-401 |
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 |
