Home > Carbon Steel > ST 35/ST 35.8 Tubing
Bosega Pipes and Tubes, located in Cape Town, South Africa, offers robust and high-performance **ST 35 / ST 35.8 Tubing**, which is extensively utilized in mechanical engineering, pressure systems, and heat exchanger applications. These low-carbon, seamless carbon steel tubes are celebrated for their excellent weldability, precise dimensions, and reliable performance under moderate pressure and temperature conditions. Bosega guarantees that all tubing meets relevant international standards like DIN 17175 and DIN 2391, ensuring consistent quality and a reliable supply.
**ST 35** and **ST 35.8** are low-carbon steel grades that boast impressive mechanical properties and toughness. ST 35 is generally used for standard mechanical and hydraulic applications, while ST 35.8 is tailored for high-temperature and pressure scenarios, particularly in boiler and heat exchanger systems. These tubes provide good formability, machinability, and moderate resistance to corrosion, and they are often supplied in normalized or annealed conditions to improve their mechanical performance and structural uniformity.
| Standard | Grade | C | Si | Mn | P max | S max |
| DIN2391 | St35 | ≤0.17 | ≤0.35 | ≥0.4 | 0.025 | 0.025 |
| Cold drawn(Mandatory) | Cold drawn(Soft) | Cold Drawn and Stress Release | Anneal | Normalizing | ||||||||
| BK1) | BKW1) | (BKS) | (GBK)1) | (NBK)1) | ||||||||
| Grade | Tensile | Elongation | Tensile | Elongation | Tensile | Yield point | Elongation | Tensile | Elongation | Tensile | Yield point | Elongation |
| N/mm2 | % | N/mm2 | % | N/mm2 | N/mm2 | % | N/mm2 | % | N/mm2 | N/mm2 | % | |
| St35 | 480 | 6 | 420 | 10 | 420 | 315 | 14 | 315 | 35 | 340~470 | 235 | 25 |