Steel 12G2B
Designation
| Name | The value |
|---|---|
| Designation GOST Cyrillic | 12Г2Б |
| Designation GOST Latin | 12G2B |
| Transliteration | 12G2B |
| By chemical elements | 12Mn2Nb |
Description
12G2B steel is used: for the manufacture of welded steel structures for General industrial use.
Note
Steel low alloy manganese-niobium. The degree of deoxidation — SP.
Steel 12G2B provides strength grade sheet, universal broadband rental and roll-formed profiles KP 390 with plate thickness of up to 10 mm. without the use of additional hardening treatment.
Standards
| Name | Code | Standards |
|---|---|---|
| Classification, nomenclature and General rules | В20 | GOST 19281-89 |
| Steel pipes and fittings to them | В62 | GOST 20295-85, GOST 24950-81 |
| Sheets and strips | В23 | GOST 82-70, GOST 19282-73 |
| Bars and shapes | В22 | GOST 8278-83, GOST 8281-80, GOST 8282-83, GOST 8283-93, GOST 9234-74, GOST 11474-76 |
| Sheets and strips | В33 | TU 14-1-4431-88 |
| Bars and shapes | В32 | TU 14-2-986-91, TU 14-136-367-2008 |
Chemical composition
| Standard | C | S | P | Mn | Cr | Si | Ni | Fe | Cu | N | As | Al | Ti | Nb |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| GOST 19282-73 | 0.1-0.16 | ≤0.04 | ≤0.035 | 1.3-1.65 | ≤0.3 | 0.17-0.37 | ≤0.3 | Rest | ≤0.3 | ≤0.008 | ≤0.08 | ≤0.05 | ≤0.03 | 0.02-0.04 |
Fe is the basis.
According to GOST 19282-73, it is allowed to modify steel with calcium and rare-earth elements from the calculation of the introduction of not more than 0.02% calcium and 0.05% rare-earth elements into the metal.
According to GOST 19281-89 and GOST 19282-73, it is allowed to add aluminum and titanium from the calculation of the mass fraction in the rolled aluminum - no more than 0.050%, titanium - no more than 0.030%.
According to GOST 19282-73, it is allowed to modify steel with calcium and rare-earth elements from the calculation of the introduction of not more than 0.02% calcium and 0.05% rare-earth elements into the metal.
According to GOST 19281-89 and GOST 19282-73, it is allowed to add aluminum and titanium from the calculation of the mass fraction in the rolled aluminum - no more than 0.050%, titanium - no more than 0.030%.
Mechanical properties
| Section, mm | sT|s0,2, MPa | σU, MPa | d5, % |
|---|---|---|---|
| The plates and universal broadband in the state of delivery GOST 19282-73 | |||
| 5-10 | ≥390 | ≥540 | ≥19 |
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 |
