Designation
| Name |
The value |
| Designation GOST Cyrillic |
30ХЛ |
| Designation GOST Latin |
30XL |
| Transliteration |
30HL |
| By chemical elements |
30Cr |
Description
30KHL steel is used: for the manufacture of castings of the housings are shock-absorbing devices of freight cars, and other parts of various industrial; hinged cast normal strength chains for rotary kilns used in cold area when the gas stream temperature of 200−500° C and a heat exchange device of rotary cement kilns.
Standards
| Name |
Code |
Standards |
| Castings with special properties (iron and steel) |
В83 |
GOST 21357-87, TU 4112-07507311-010-02 |
| Steel castings |
В82 |
GOST 977-88 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
| GOST 977-88 |
0.25-0.35 |
≤0.04 |
≤0.04 |
0.5-0.9 |
0.5-0.8 |
0.2-0.5 |
- |
Rest |
- |
| GOST 21357-87 |
0.25-0.35 |
≤0.02 |
≤0.02 |
0.5-0.9 |
0.5-0.8 |
0.2-0.5 |
≤0.3 |
Rest |
≤0.3 |
Fe is the basis.
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, MPa |
d |
y, % |
KCU, kJ/m2 |
| Hardening in air, 890-910 °C + vacation at 620-660 °C, air cooling |
| 100 |
≥432 |
≥677 |
≥15 |
≥30 |
≥402 |
| Normalization at 900-920 °C + vacation at 550-650 °C, air cooling |
| 100 |
≥285 |
≥530 |
≥15 |
≥30 |
≥265 |
| Casting. Quenching in water from 920-950 °C + vacation at 600-650 °C, air cooling (KCU-60) |
| - |
≥550 |
≥660 |
≥10 |
≥20 |
≥3 |
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 |
| d |
Elongation after rupture |
| y |
The relative narrowing |
| KCU |
Toughness |
