DIN 1626 Welded Circular Unalloyed Steel Tubes Subject to Special Requirements
DIN 1629 Seamless Circular Unalloyed Steel Tubes Subject to Special Requirements
DIN 17175 Seamless Tubes of Heat-Resistant Steels
| Steel Grade Symbol |
Type of deoxidization |
Chemical Composition (cast analysis) % (max unless otherwise specified) |
| C |
Si (1) |
Mn |
P |
S |
N (2) |
| St 37.0 |
R |
0.17 |
- |
- |
0.040 |
0.040 |
0.009(3) |
| St 35.8 |
- |
0.17 |
0.10-0.35 |
0.40-0.80 |
0.040 |
0.040 |
- |
NOTES:
(1) The minimum Si content is allowed to fall below 0.10%, when the steel is aluminium-killed or vacuum-deoxidized.
(2) A content in excess of the maximum value stated is permitted if a P content less than the maximum specified by 0.005% P per 0.001% N is observed. However the N content shall not exceed a value of 0.012% in the cast analysis and 0.014% in the product analysis.
(3) The specified value does not apply if the steels are supplied with the RR (instead of R) type of deoxidization.
R=killed, including semi-killed
RR= fully killed
Amounts by which the chemical composition in the product/sample analysis may deviate from the limiting values applicable to the cast analysis.
| Element |
St 37.0 Allowable Deviation Amount % |
St 35.8 |
| Upper Limits Quoted in Cast Analysis |
Allowable Deviation Amount (2) % |
| C |
0.02 |
0.24 |
±0.02 |
| Si |
- |
0.35 |
±0.03 |
| Mn |
- |
1.00 |
±0.04 |
| P |
0.010 |
0.040 |
±0.010 |
| S |
0.010 |
0.040 |
±0.010 |
| N |
0.001(1) |
- |
- |
NOTES:
(1) A content in excess of the maximum value stated is permitted if a P content less than the maximum specified by 0.005% P per 0.001% N is observed. However the N content shall not exceed a value of 0.012% in the case analysis and 0.014% in the product analysis (this does not apply to the RR type of deoxidization).
(2) In a cast the deviation of an element in a sample analysis is permitted to be below the minimum value or only above the maximum value of the range stipulated for the cast analysis, though not both at the same time.
| Steel Grade Symbol |
Upper Yield Stress ReH for Wall thicknesses, in mm |
Tensile Strength Rm |
Elongation after Fracture A5 |
Impact Strength Transverse |
| ReH£16 |
16< ReH£40 |
40< ReH£60 |
Longitudinal |
Transverse |
| Min N/mm2 |
Min % |
Min J |
| St 37.0 |
235 |
225 |
215 |
350(1) -480 |
25 |
23 |
- |
| St 35.8 |
235 |
225 |
215 |
360-480 |
25 |
23 |
34 |
NOTE:
(1) For cold finished tubes in the NBK condition, minimum values of tensile strength lower than this value by 10N/mm2 is permitted. |
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