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Standards:

  
 Russian , Ukrainian & International  Standards with Chemical   Compositions & Mechanical Properties

 

Table 1

Ordinary Quality Carbon Steel GOST 380-94

 

Fraction of total mass of the elements, %

Mechanical properties

 

 

 

 

 

Steel

C

Mn

Si

 S 

 P 

 Cr 

 Ni 

 Cu 

N

As

Gt, MPa

Gv, MPa

 

d5, %

 

KCU J/cm2 (+20/-20)

grade

 

 

 

not more than

< 20 mm

20-40 mm

> 40 mm

 

< 20 mm

20-40 mm

> 40 mm

5-9 mm

10-25 mm

26-40 mm

St 0

0.23 max

-

-

  0.060

  0.070

 

 

 

0.01

0.08

-

-

-

300 min

23

22

20

-

-

-

St 1 kp

0.06-0.12

0.25-0.50

0.05 max

  0.050

  0.040

     0.30

    0.30

     0.30

0.01

0.08

-

-

-

-

-

-

-

-

-

-

St 1 ps

0.06-0.12

0.25-0.50

0.05-0.15

  0.050

  0.040

     0.30

    0.30

     0.30

0.01

0.08

-

-

-

-

-

-

-

-

-

-

St 1 sp

0.06-0.12

0.25-0.50

0.15-0.30

  0.050

  0.040

     0.30

    0.30

     0.30

0.01

0.08

-

-

-

-

-

-

-

-

-

-

St 2 kp

0.09-0.15

0.25-0.50

0.05 max

  0.050

  0.040

     0.30

    0.30

     0.30

0.01

0.08

215

205

195

320-410

33

32

30

-

-

-

St 2 ps

0.09-0.15

0.25-0.50

0.05-0.15

  0.050

  0.040

     0.30

    0.30

     0.30

0.01

0.08

225

215

205

330-430

32

31

29

-

-

-

St 2 sp

0.09-0.15

0.25-0.50

0.15-0.30

  0.050

  0.040

     0.30

    0.30

     0.30

0.01

0.08

225

215

205

330-430

32

31

29

-

-

-

St 3 kp

0.14-0.22

0.30-0.60

0.05 max

  0.050

  0.040

     0.30

    0.30

     0.30

0.01

0.08

235

225

215

360-460

27

26

24

-

-

-

St 3 ps

0.15-0.22

0.40-0.65

0.06-0.15

  0.050

  0.040

     0.30

    0.30

     0.30

0.01

0.08

245

235

225

370-480

26

25

23

78/39

69/29

49/-

St 3 sp

0.15-0.22

0.40-0.65

0.15-0.30

  0.050

  0.040

     0.30

    0.30

     0.30

0.01

0.08

245

235

225

370-480

26

25

23

78/39

69/29

49/-

St 3 Gps

0.14-0.22

0.80-1.10

0.15 max

  0.050

  0.040

     0.30

    0.30

     0.30

0.01

0.08

245

235

225

370-490

26

25

23

78/39

69/29

49/-

St 3 Gsp

0.14-0.20

0.80-1.10

0.15-0.30

  0.050

  0.040

     0.30

    0.30

     0.30

0.01

0.08

255

245

-

390-570

23

24

-

78/39

69/29

49/29

St 4 kp

0.18-0.27

0.40-0.70

0.05 max

  0.050

  0.040

     0.30

    0.30

     0.30

0.01

0.08

-

-

-

-

-

-

-

-

-

-

St 4 ps

0.18-0.27

0.40-0.70

0.05-0.15

  0.050

  0.040

     0.30

    0.30

     0.30

0.01

0.08

265

255

245

410-530

24

23

21

78/-

59/-

39/-

St 4 sp

0.18-0.27

0.40-0.70

0.15-0.30

  0.050

  0.040

     0.30

    0.30

     0.30

0.01

0.08

265

255

245

410-530

24

23

21

78/-

59/-

39/-

St 5 ps

0.29-0.37

0.50-0.80

0.06-0.15

  0.050

  0.040

     0.30

    0.30

     0.30

0.01

0.08

285

275

265

490-630

20

19

17

-

-

-

St 5 sp

0.28-0.37

0.50-0.80

0.15-0.30

  0.050

  0.040

     0.30

    0.30

     0.30

0.01

0.08

285

275

265

490-630

20

19

17

-

-

-

St 5 Gps

0.22-0.30

0.80-1.20

0.15 max

  0.050

  0.040

     0.30

    0.30

     0.30

0.01

0.08

285

275

265

450-590

20

19

17

-

-

-

St 6 ps*

0.39-0.49

0.50-0.80

0.05-0.15

  0.050

  0.040

     0.30

    0.30

     0.30

0.01

0.08

315

305

295

590min

15

14

12

-

-

-

St 6 sp*

0.38-0.49

0.50-0.80

0.15-0.30

  0.050

  0.040

     0.30

    0.30

     0.30

0.01

0.08

-

-

-

-

-

-

-

-

-

-

As per Gost 535-88:

Limiting deviations for steel rolled products:

Steel

Elements

 

C

Mn

 Si 

 S 

 P 

 N 

Rimming:

+/- 0.03

+0.05/-0.04

-

+0.006

+0.006

+0.002

killed and semi-killedemikilled:

+0.03/-0.02

+0.05/-0.03

+0.03/-0.02

+0.005

+0.005

+0.002

 

 

 

 

1. For rolled products of steel grades St3kp, St3ps, St3sp, St3Gps, St3Gps for welded constructions the positive deviations in the fraction of total  mass of carbon are not permitable.

2. During deoxidation of semi killed steel with Al, Ti or another free of Si deoxidizers and with several deoxidizes and with several deoxidizes as well (FeSi & Al, FeSi & Ti) the fraction of total mass of Si in steel is permitted less than 0.05%. Deoxiditation with Ti, Al and other free of Si deoxidizers is specified in the quality certificate.

3. For steel grades St3Gsp and St3Gps impact ductility norms are specified for thicknesses 5-9mm, 10-30mm and 31-40mm accordingly.

 

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