Standard |
Grade |
Chemical Components (%) |
|||||
Symbol |
Material No. |
C |
Si |
Mn |
P |
S |
|
DIN2391 |
St 30 Si |
1.0211 |
≤0.10 |
≤0.10 |
≤0.55 |
≤0.025 |
≤0.025 |
St 30 Al |
1.0212 |
≤0.10 |
≤0.05 |
≤0.55 |
≤0.025 |
≤0.025 |
|
St 35 |
1.0308 |
≤0.17 |
≤0.35 |
≥0.40 |
≤0.025 |
≤0.025 |
|
St 5 |
1.0408 |
≤0.21 |
≤0.35 |
≥0.40 |
≤0.025 |
≤0.025 |
|
St 52 |
1.058 |
≤0.22 |
≤0.55 |
≤1.60 |
≤0.025 |
≤0.025 |
Designation |
Symbol |
Description |
Cold finished (hard) |
BK |
Tubes do not undergo heat treatment following the final cold forming and thus, have a rather high resistance to deformation. |
Cold finished (soft) |
BKW |
The final heat treatment is followed by cold drawing involving limited deformation. Appropriate further processing allows a certain degree of cold forming (e.g. bending, expanding). |
Cold finished and stress-relieved |
BKS |
Heat treatment is applied following the last cold forming process. Subject to appropriate processing conditions, the increase in the residual stresses involved enables both forming and machining to a certain degree. |
Annealed |
GBK |
The last cold forming process is followed by annealing in a controlled atmosphere. |
Normalized |
NBK |
The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere. |
Symbol in accordance with EN 10305 |
Symbol in accordance with DIN2391 |
+C |
BK |
+LC |
BKW |
+SR |
BKS |
+A |
GBK |
+N |
NBK |
Steel Grade |
Minimum values for the delivery condition |
||||||||||||
Steel Name |
Steel Number |
BK |
BKW |
BKS |
GBK |
NBK |
|||||||
Rm |
A % |
Rm |
A % |
Rm |
ReH |
A % |
Rm |
A % |
Rm |
ReH |
A % |
||
Mpa |
Mpa |
Mpa |
Mpa |
Mpa |
Mpa |
Mpa |
|||||||
St 30 Si |
1.0211 |
430 |
8 |
380 |
12 |
380 |
280 |
16 |
280 |
30 |
290 to 420 |
215 |
30 |
St 30 Al |
1.0212 |
430 |
8 |
380 |
12 |
380 |
280 |
16 |
280 |
30 |
290 to 420 |
215 |
30 |
St 35 |
1.0308 |
480 |
6 |
420 |
10 |
420 |
315 |
14 |
315 |
25 |
340 to 470 |
235 |
25 |
St 45 |
1.0408 |
580 |
5 |
520 |
8 |
520 |
375 |
12 |
390 |
21 |
440 to 570 |
255 |
21 |
St 52 |
1.058 |
640 |
4 |
580 |
7 |
580 |
420 |
10 |
490 |
22 |
490 to 630 |
355 |
22 |
Inspection or test types |
Test frequency |
Internal test |
|
Chemical analysis |
M |
Tensile testing |
M |
Flattening test or extension test |
M |
Dimension verification |
M |
Visual inspection |
M |
NDT in order to identify leaks |
Individual |
请输入搜索关键字
确定