Steel St4kp (ВСт4кп)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
Ст4кп |
| Designation GOST Latin |
Ct4kp |
| Transliteration |
St4kp |
| The chemical elements |
4 |
| Name |
The value |
| Designation GOST Cyrillic |
ВСт4кп |
| Designation GOST Latin |
BCt4kp |
| Transliteration |
VSt4kp |
| The chemical elements |
4 |
Description
Steel St4kp used: for the production of corner rolled steel, h-beam, channels, used in steel structures and construction; welded, riveted and bolted structures high strength; light duty parts; tube and pipe; two-headed rails, t-type P5, is designed for ground and suspended tracks; crutches accuracy class, designed for fastening of rails to wooden sleepers and bars.
Note
The degree of deoxidation — KP.
Standards
| Name |
Code |
Standards |
| Sheets and stripes |
В23 |
GOST 14918-80, GOST 16523-97, GOST 16523-89, GOST 16523-70, GOST 103-2006 |
| Pipes steel and connecting parts to them |
В62 |
GOST 3262-75, GOST 8639-82, GOST 8642-68, GOST 8644-68, GOST 8645-68, GOST 8646-68, GOST 10704-91, GOST 10705-80, GOST 10707-80, GOST 13663-86, GOST 13664-68, TU 14-3-1160-83, TU 14-3-1428-86, TU 1373-013-02949352-2003 |
| Rails. Lining. Lining. Crutches |
В42 |
GOST 3280-84, GOST 5812-82, GOST 7056-77, GOST 8142-89, GOST 8194-75, GOST 12135-75, GOST 16277-93, GOST 22343-90 |
| Tapes |
В24 |
GOST 3560-73, GOST 6009-74, STP М309-74 |
| Classification, nomenclature and general norms |
В20 |
GOST 380-2005 |
| Sectional and shaped rolling |
В22 |
GOST 5422-73, GOST 5781-82, GOST 8239-89, GOST 8240-97, GOST 8278-83, GOST 8281-80, GOST 8282-83, GOST 8283-93, GOST 8509-93, GOST 8510-86, GOST 9234-74, GOST 11474-76, GOST 19240-73, GOST 19425-74, GOST 535-2005, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006, OST 5.9086-85, OST 5.9087-84, TU 14-2-341-78 |
| Bulls. Blanks. Slabs |
В31 |
OST 3-1686-90, TU 14-1-4944-90 |
| Metal forming. Forgings |
В03 |
OST 5Р.9125-84 |
| Sheets and stripes |
В33 |
TU 14-1-3579-83, TU 14-1-4431-88 |
| Sectional and shaped rolling |
В32 |
TU 14-11-245-88, TU 14-136-367-2008 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
N |
As |
| GOST 380-2005 |
0.18-0.27 |
≤0.05 |
≤0.04 |
0.4-0.7 |
≤0.3 |
≤0.05 |
≤0.3 |
The rest |
≤0.3 |
≤0.012 |
≤0.08 |
Fe is the basis.
The nitrogen content is indicated for steel smelted in electric furnaces. In open-hearth and converter steels, the content of N≤0.010%.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
d4 |
| Longitudinal electric-welded pipes (Dy=10-530 mm) in the delivery condition. Listed marsvolta base metal |
| - |
≥245 |
≥412 |
≥21 |
- |
| Pipe electric-welded profile in the delivery state according to GOST 13663-86 (samples) |
| - |
- |
≥372 |
≥10 |
- |
| - |
≥245 |
≥412 |
≥21 |
- |
| The hot rolled shapes in the state of delivery |
| ≤20 |
≥255 |
400-510 |
≥25 |
- |
| 20-40 |
≥245 |
400-510 |
≥24 |
- |
| 40-100 |
≥235 |
400-510 |
≥22 |
- |
| 100 |
≥225 |
400-510 |
≥22 |
- |
| Hot-rolled sheet in the delivery condition. Group strength ОК400В |
| ≤2 |
- |
400-680 |
- |
≥17 |
| 2-3.9 |
- |
400-680 |
- |
≥19 |
| Cold-rolled sheet in the delivery condition. Group strength ОК400В |
| ≤2 |
- |
400-680 |
- |
≥19 |
| 2-3.9 |
- |
400-680 |
- |
≥21 |
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 |
| d4 |
Elongation after rupture |
Technological properties
| Name |
The value |
| Weldability |
Welded is limited. |
| Propensity to temper brittleness |
tend not |
| Forging temperature |
Start - 1200 °C, the end - 850 °C. |
| Flock-sensitive sensitivity |
not sensitive |
| Workability by cutting |
Under HB 152 Kn TV.SPL.=1.7 Kn b.St.=1.7 |
