Home > Carbon Steel > ST 35/ST 35.8 Tubing
Ojas Pipes and Tubes, located in Kolkata, India, has built a solid reputation as a manufacturer and supplier of ST 35 and ST 35.8 Tubing. We take pride in providing top-notch carbon steel tubing solutions tailored for a variety of industrial needs. Our tubing is designed to comply with DIN 2391 and DIN 17175 standards, ensuring it boasts durability, high strength, and precise dimensions. We cater to a wide range of industries, including power generation, boilers, heat exchangers, and general engineering, delivering tubing that performs reliably even under high pressure and temperature. Our commitment to quality assurance, timely deliveries, and a customer-focused approach helps us meet the needs of both domestic and international clients.
ST 35 and ST 35.8 are low carbon steel grades that are commonly used in seamless tubing applications. Their typical chemical makeup includes up to 0.17% Carbon, 0.40% Manganese, along with trace amounts of Silicon, Phosphorus, and Sulfur. These materials are known for their good weldability and machinability. ST 35 tubing has a tensile strength ranging from 440 to 570 MPa and a yield strength of about 235 MPa. On the other hand, ST 35.8, which is designed for higher temperatures, offers slightly enhanced strength and thermal stability. Both grades excel in pressure resistance, making them perfect for structural and high-temperature tubing applications in boiler and heat exchanger systems.
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 |