Designation
| Name |
The value |
| Designation GOST Cyrillic |
55СМ5ФА |
| Designation GOST Latin |
55CM5FA |
| Transliteration |
55SM5FA |
| By chemical elements |
55СMo5V |
Description
55СМ5ФА steel is used: for the production of hot rolled, kalibrovochnogo with special surface finish that is used in tool making; balls and rollers, drilling bits, as well as parts of the bearings of the turbodrill.
Standards
| Name |
Code |
Standards |
| Bars and shapes |
В32 |
TU 14-1-1339-75, TU 14-136-338-93, TU 14-1-2666-79 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Mo |
| TU 14-136-338-93 |
0.53-0.6 |
≤0.015 |
≤0.025 |
0.3-0.6 |
≤0.3 |
0.8-1.1 |
≤0.3 |
Rest |
≤0.25 |
0.15-0.25 |
0.4-0.6 |
Fe is the basis.
According to TU 14-136-338-93 the chemical composition is given for steel grade 55SM5FA. In the steel, the residual content of nickel and chromium is allowed up to 0.30% of each. In the finished rolled steel, subject to the requirements of the specification, deviations in chemical composition are allowed: by carbon ± 0.010%; by molybdenum, manganese and vanadium ± 0.020% each, in silicon ± 0.050%.
Mechanical properties
| Section, mm |
HRC |
| Bars hot rolled and calibrated with special surface finish on the other 14-136-338-93. The longitudinal samples. Quenching in oil with 880-900 °C + Vacation at 200-250 °C (exposure for 2.5-3.0 hours), air cooling |
|
56-59 |
Description mechanical marks
| Name |
Description |
| HRC |
Rockwell hardness (indenter diamond spheroconical) |
Technological properties
| Name |
The value |
| Macrostructure and pollution |
The macrostructure of the steel when checking the finished varietal hire should not have balances shrinkage and podnasadochnogo of rychlosti, cracks, delamination, gas bubbles, foreign metal and slag inclusions, placenow and stratification visible without using the magnifying devices. Quality assessment of macrostructure is scored, at the same time allowed the Central porosity, point heterogeneity General boundary segregation and phase separation in the square no more than 2 points. Steel is controlled on the contamination of non-metallic inclusions and must not exceed the maximum score for all types of inclusions (FROM, OS, CX, SP, SI and C) not more than 4.5 points, and nitrides not more than 2.5 points. |
| Microstructure |
Depth bezoperatsionnogo layer of calibrated steel and steel with special surface finish shall not exceed 1% of the diameter of the rod. By agreement with consumer it is permitted to supply steel gauged bars with obesplozhennym layer is not more than 2% of the diameter of the rod. |
