Carbon steel is the backbone of pipelines, process piping, pressure vessels and structures. Bright Tubes supplies ASTM A106, A53, API 5L, A333, IS 1239 and IS 3589 pipes, A516 pressure-vessel plate, IS 2062, A36 and EN S275/S355 structural steel, plus A234/A105 fittings and flanges, in IBR and non-IBR supply.
Carbon steel orders are written by specification, not by "grade" alone. The same Grade B means different things in A106, A53 and API 5L. Start from the service, then match pipe, plate, fittings and flanges within one line class.
| Service | Pipe | Plate | Fittings / flanges |
|---|---|---|---|
| Process and steam lines at elevated temperature | ASTM A106 Gr B | ASTM A516 Gr 70 | A234 WPB / A105 |
| Low-temperature service, impact-tested to −46 °C | ASTM A333 Gr 6 | A516 Gr 60 / Gr 70 with Charpy tests | A420 WPL6 / A350 LF2 |
| Oil and gas transmission and gathering lines | API 5L Gr B to X70 (PSL 2) | — | MSS SP-75 fittings, A694 flanges (on request) |
| General water, air and low-pressure utility lines | ASTM A53 Gr B, IS 1239, IS 3589 | — | A234 WPB / A105 |
| Structures, frames and fabrication | — | IS 2062 E250, E350, ASTM A36, EN S355 | — |
Carbon equivalent, CE(IIW) = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15, predicts hardening in the weld zone. Around 0.43 is the usual ceiling for welding without preheat. IS 2062 E250 limits CE to 0.42. Ask for CE on the certificate when sections are heavy.
For wet H₂S service, NACE MR0175 / ISO 15156 limits hardness to 22 HRC, and plate and line pipe are often HIC-tested (NACE TM0284). Order "sour service" explicitly: it changes chemistry, testing and price.
Ordinary carbon steel turns brittle in the cold. A333 Gr 6 and normalised A516 with Charpy tests are the usual answer down to −46 °C. Below that, specify nickel steels or austenitic stainless steel.
Pipes and plates for boilers and steam lines in India must be supplied with Indian Boiler Regulations certification. We supply IBR and non-IBR material; state which on the enquiry.
A106 is seamless pipe for high-temperature process service. API 5L is line pipe for pipeline transportation, with PSL levels and sour and offshore annexes.
Yes, when required, with inspection-authority documentation for the consignment.
29 grades and products, in 10 product forms: pipes, plates, sheets, coils, bars, fittings, flanges, angles, channels, beams.
Yes: to the GCC, Southeast Asia, Europe, the USA, the UK and beyond, with export packing and documentation.
Tell us the grade, form, specification, size, quantity and destination.