DIN 1629 Seamless Tubes
DIN 1629 is the standard specifies the Seamless Circular Tubes of Non Alloys Steels with Special Quality Requirements.
DIN 1629 Size range (mm):
- Outer Dimensions: 6.0mm-219.0mm
- Wall Thickness: 1.0mm-30 mm
- Length: max 12000mm
Application:
- It is used for manufacturing pipeline,vessel,equipment,pipe fittings .
- These tubes are prodominantly used in construction of chemical plant, vessels, pipework and for genearl mechanical engineering purpose.
The main products of steel / steel grade:
- DIN1629 ST37.0
- DIN1629 ST44.0
- DIN1629 ST52.0
Delivery Condition:
- Heat treatment,Annealed, Normalized, Normalized and Tempered
Surface treatment:
- Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting
- Painting as requested.
Chemical Compositions(%) of DIN1629
| Grade | C | Si | Mn | P | S |
| DIN1629 ST37.0 | ≤0.17 | / | / | ≤0.040 | ≤0.040 |
| DIN1629 ST44.0 | ≤0.21 | / | / | ≤0.040 | ≤0.040 |
| DIN1629 ST52.0 | ≤0.22 | ≤0.55 | ≤1.70 | ≤0.040 | ≤0.035 |
Mechanical Properties of DIN1629
| Grade | Yield Strength (Mpa) | Tensile Strength (Mpa) | Elongation (%)L | Elongation (%)T |
| DIN1629 ST37.0 | ≥235 | 350-480 | 25 | 23 |
| DIN1629 ST44.0 | ≥275 | 420-550 | 21 | 19 |
| DIN1629 ST52.0 | ≥355 | 500-650 | 21 | 19 |
Amounts by which the chemical composition in the product analysis may deviate from the limiting values applicable to the cast analysis
| Element | Amount by which the product analysis may deviate from |
| the limiting values applicable to the analysis % by mass | |
| C | +0,02 |
| P | +0,010 |
| S | +0,010 |
| N | +0,001¹) |
¹) A contant in excess of the maximum value stated is permitted if a phosphorus content less than the maximum specified by 0,005% P per 0,001% N is observed. However, the nitrogen contant shall not exceed a value of 0,012% in the cast analysis and 0,014% in the product analysis (this does not apply to the RR type of deoxidization.
