St4sp(ВСт4сп) Structural carbon steel of ordinary quality

Steelun Designation of St4sp(ВСт4сп) Structural carbon steel of ordinary quality:

Name The value
Designation GOST Cyrillic Ст4сп
Designation GOST Latin Ct4cp
Transliteration St4sp
By chemical elements 4
Name The value
Designation GOST Cyrillic ВСт4сп
Designation GOST Latin BCt4cp
Transliteration VSt4sp
By chemical elements 4

Description Steelun of St4sp(ВСт4сп) Structural carbon steel of ordinary quality:

Steel St4sp(ВСт4сп) 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 joists; corner pads for fastening rails type R18 and R24.

Note

The degree of deoxidation — SP.

Steelun Standards of St4sp(ВСт4сп) Structural carbon steel of ordinary quality:

Name Code Standards
Steel pipes and fittings to them В62 GOST 3262-75, GOST 8639-82, GOST 8642-68, GOST 8644-68, GOST 8645-68, GOST 8646-68, GOST 8732-78, GOST 9567-75, GOST 10704-91, GOST 10705-80, GOST 10707-80, GOST 13663-86, GOST 8731-87, GOST 13664-68, GOST Р 53383-2009, TU 14-3-1160-83, TU 14-3-1428-86, TU 14-3-1473-87, TU 14-3Р-50-2001, TU 14-3-1654-89, TU 1373-013-02949352-2003
Rails. Lining. Lining. Crutches В42 GOST 3280-84, GOST 5812-82, GOST 7056-77, GOST 8141-56, GOST 8142-89, GOST 8194-75, GOST 12135-75, GOST 16277-93, GOST 22343-90
Tape В24 GOST 3560-73, GOST 6009-74, STP М309-74
Classification, nomenclature and General rules В20 GOST 380-2005
Bars and shapes 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
Sheets and strips В23 GOST 82-70, GOST 14637-89, GOST 14918-80, GOST 16523-97, GOST 16523-89, GOST 16523-70, GOST 103-2006
Blanks. Of the workpiece. Slabs В31 OST 3-1686-90, TU 14-1-4944-90
Sheets and strips В33 TU 14-1-3579-83, TU 14-1-4431-88
Bars and shapes В32 TU 14-2-849-89, TU 14-11-245-88, TU 14-136-367-2008

Chemical composition Steelun of St4sp(ВСт4сп) Structural carbon steel of ordinary quality:

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 0.15-0.3 ≤0.3 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%.

Steelun Mechanical properties of St4sp(ВСт4сп) Structural carbon steel of ordinary quality:

Section, mm t отпуска, °C sT|s0,2, MPa σU, MPa d5, % d4 y, % KCU, kJ/m2 HB, MPa
Pipe electric-welded profile in the delivery state according to GOST 13663-86 (samples)
≥372 ≥10
≥245 ≥412 ≥21
The hot rolled plate, long products and fittings as supplied
≤20 ≥265 410-530 ≥24 ≥880
20-40 ≥255 410-530 ≥23 ≥690
40-100 ≥245 410-530 ≥21
100 ≥235 410-530 ≥21
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
Forgings. Annealing in air from 850 °C + Vacation at 570 °C
300-500 ≥315 ≥570 ≥12 ≥30 ≥290 167-207
Long products (wire). Quenching in oil from 850 °C + Vacation at 570 °C , cooling in water or oil
≤25 ≥685 ≥780 ≥12 ≥45 ≥980
Longitudinal electric-welded pipes (Dy=10-530 mm), seamless hot deformed tubes in the delivery condition
≥245 ≥412 ≥20
Quenching using water in oil from 850 °C + Vacation at 560 °C (exposure for 10 h), cooling in water
550 ≥930
550 ≥870
550 ≥730
Quenching in oil from 850 °C + vacation
200 ≥1580 ≥1780 ≥15 ≥36 ≥499
300 ≥1470 ≥1670 ≥16 ≥40 ≥478
400 ≥1290 ≥1370 ≥16 ≥41 ≥415
500 ≥1150 ≥1200 ≥16 ≥46 ≥350
600 ≥950 ≥1040 ≥19 ≥54 ≥269
A sample with diameter 10 mm, length 50 mm, forged
≥185 ≥200 ≥34 ≥93
≥89 ≥135 ≥57 ≥98
≥52 ≥76 ≥68 ≥100
≥27 ≥50 ≥75 ≥100
≥18 ≥35 ≥66 ≥100
≥10 ≥20 ≥66 ≥100

Description mechanical marks steelun of St4sp(ВСт4сп) Structural carbon steel of ordinary quality:

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
d4 Elongation after rupture
y The relative narrowing
KCU Toughness
HB Brinell hardness number

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