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Bulan Pipes and Tubes, a top-notch manufacturer and supplier located in Jakarta, Indonesia, has built a solid reputation for providing high-quality ST 35 and ST 35.8 Tubing to a variety of industries. With a strong focus on precision engineering and rigorous quality control, Bulan delivers both seamless and welded tubing solutions that adhere to international standards. The ST 35/ST 35.8 Tubing is highly valued for its outstanding performance in high-pressure and high-temperature settings. Supported by state-of-the-art facilities and a talented workforce, Bulan guarantees timely deliveries and competitive pricing, making it a reliable partner for clients in construction, oil & gas, power generation, and automotive sectors.
The ST 35/ST 35.8 Tubing is a low carbon steel alloy, primarily made up of carbon (max 0.17%), manganese (max 0.40%), phosphorus (max 0.035%), and sulfur (max 0.035%). This steel grade is known for its high ductility, good weldability, and excellent machinability. In terms of mechanical properties, it boasts a tensile strength between 480–640 MPa, a minimum yield strength of 235 MPa, and an elongation of around 25%. It’s perfect for cold-forming processes and can handle high pressure in hydraulic and pneumatic systems, making it suitable for applications in boilers, superheaters, and heat exchangers.
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 |