Carbon steel Pipe
Premium Carbon Steel Pipes engineered for high-performance industrial applications, available in Hot Rolled and Cold Rolled (Dialed) variations. Our extensive inventory includes Seamless, Welded, ERW, and LSAW pipes designed to withstand extreme stress and high-pressure conditions. Certified to major international standards including API 5L (up to Grade X65, PSL-1/PSL-2), ASTM A53/A106, ASME, and NACE MR0175. Sizes range from 1/8″ to 48″ with wall thickness schedules from SCH 10 through XXXH. Ideal for oil and gas transportation, boiler and condenser systems, heavy engineering, and chemical processing. Available in single random and double random lengths.
Description
1. Comprehensive Product Overview
Carbon steel pipes are broadly divided into two main manufacturing categories: Hot Rolled and Cold Rolled (Pulled/Dialed) steel pipes. Depending on the precise requirements of your industrial application, we offer a robust selection of specialized pipe types:
- Hot Rolled Carbon Steel Pipe: Includes ordinary steel pipes, low and medium-pressure boiler pipes, high-pressure boiler pipes, alloy steel pipes, petroleum cracking pipes, geological pipes, and more.
- Cold Rolled Carbon Steel Pipe: Encompasses all hot rolled categories, with the addition of precision carbon thin-walled pipes and alloy thin-walled steel pipes.
Pipe Types & Technical Grades
| Category | Size Range & Schedules | Key Specifications & Grades |
|---|---|---|
| Seamless Carbon Pipe High strength, trace amounts of Si, Mn, Cu. Extremely resistant to stress. |
Sizes: 1/8″ – 26″ Schedules: Sch. 20 through XXH (XXXH in 2-1/2″ and 3″) Length: Single & Double Random |
ASTM A53 Grade B, ASTM A106 Grade B/C, API 5L Grade B / X42 / X52 / X60 / X65, ASTM A333 Grade 1/6, ASME, NACE MR0175. |
| Welded Carbon Pipe Ideal for water, waste, and general high-pressure transport. |
Sizes: 1/2″ – 48″ Schedules: Sch. 10, STD, and XH Length: Single & Double Random |
ASTM A53 Grade A, API 5L Grade B, API 5L Grade B / X42 / X52 / X60 / X65, PSL-1, PSL-2. |
| ERW Pipes Lightweight, precision engineered, economical. |
Widely used in Shipbuilding, Automobile, Boilers & Pressure Vessels, Railways, Oil & Petro Chemicals, Coal & Mining, Transmission Towers, and General Engineering. | |
| LSAW Pipes Easy installation, seamless finish. |
Premium pipes generally reserved for high-value energy applications and major transmission pipelines. | |
2. Detailed Dimensional Specifications
Below is the nominal pipe size (NPS) and corresponding outer diameter (OD) and nominal wall thickness chart for our standard carbon steel pipes.
| DN | NB (inch) | OD (mm) | SCH20 | STD / SCH40 | XS / SCH80 | SCH160 | XXS |
|---|---|---|---|---|---|---|---|
| 15 | 1/2″ | 21.3 | – | 2.77 | 3.73 | 4.78 | 7.47 |
| 25 | 1″ | 33.4 | – | 3.38 | 4.55 | 6.35 | 9.09 |
| 50 | 2″ | 60.3 | – | 3.91 | 5.54 | 8.74 | 11.07 |
| 100 | 4″ | 114.3 | – | 6.02 | 8.56 | 13.49 | 17.12 |
| 150 | 6″ | 168.3 | – | 7.11 | 10.97 | 18.26 | 21.95 |
| 200 | 8″ | 219.1 | 6.35 | 8.18 | 12.7 | 23.01 | 22.23 |
| 300 | 12″ | 323.8 | 6.35 | 9.53 | 12.7 | 33.32 | 25.4 |
| 400 | 16″ | 406.4 | 7.92 | 9.53 | 12.7 | 40.19 | – |
| 600 | 24″ | 609.6 | 9.53 | 9.53 | 12.7 | 59.54 | – |
| 900 | 36″ | 914.4 | 12.7 | 9.53 | 12.7 | – | – |
* Note: This is an excerpt of common sizes. Our full range spans from 1/8″ to 48″ with comprehensive wall thicknesses from SCH10 up to XXXH.
3. International Standards & Applications
- API 5L / API 5CT: Primarily used in conveying gas, water, and oil in the natural gas and petroleum industries (covers both seamless and welded); Casing and tubing.
- ASTM A53 / A106: Standard specs for black and hot-dipped zinc-coated, welded, and seamless pipes, particularly for high-temperature service.
- ASTM A179 / A192 / A213 / A335: Dedicated to heat-exchanger, condenser tubes, high-pressure boiler service, and ferritic alloy-steel applications.
- DIN Standards (17175, 1629, 2391, 2458): Covers seamless and welded circular tubes for boiler installations, high-pressure pipelines, tank construction, and high-precision machinery.
- EN 10210 / BS 3059 / JIS G3454: Seamless steel tubes for pressure purposes, steel boilers, superheaters, and general carbon steel pipes for pressure service.
4. Chemical & Mechanical Properties
Key Mechanical Properties
| Property | Grade A | Grade B | Grade C |
|---|---|---|---|
| Tensile Strength, min, psi (MPa) | 48,000 (330) | 60,000 (415) | 70,000 (485) |
| Yield Strength, min, psi (MPa) | 30,000 (205) | 35,000 (240) | 40,000 (275) |
Chemical Composition [%] (Hydrocarbon Process & Pressure Vessel Tubes)
| Specification | Grade | C (Max) | Mn | P (Max) | S (Max) | Si (Min) | Cr (Max) |
|---|---|---|---|---|---|---|---|
| ASTM A-53 | A | 0.25 | 0.95 max | 0.050 | 0.045 | – | 0.40 |
| B | 0.30 | 1.20 max | 0.050 | 0.045 | – | 0.40 | |
| ASTM A-106 | A | 0.25 | 0.27 – 0.93 | 0.035 | 0.035 | 0.10 | 0.40 |
| B | 0.30 | 0.29 – 1.06 | 0.035 | 0.035 | 0.10 | 0.40 |
5. Manufacturing Process
Our state-of-the-art production facilities utilize fully automated assembly lines to guarantee structural integrity, precise wall thickness, and defect-free finishes. Process control includes rigorous testing such as Hydrostatic testing, Ultrasonic Testing (UST) of seams, and outer diameter roundness inspections.
Intermediate and Small-Diameter Pipe Automated Manufacturing Flow
Standard Flow: Uncoil → Coil Joining / Spiral Looper → Forming → Welding → Bead Removal → Heat Treatment → Cooling → Sizing → Non-Destructive Inspection → Threading / Chamfering → Rust Protection → Final Product.
6. Packing & Delivery
To ensure safe transit across global supply chains, we offer strictly regulated packaging solutions:
- Bundled Package:
- Each bundle contains tubes of the identical batch number, steel grade, and specification.
- Tied securely with steel wire or steel hoops. Standard weight is < 50kg (Max 80kg upon special request).
- Lengths ≥ 6m: Tied with at least 8 strapping bands, divided into 3 groups (3-2-3 layout).
- Lengths < 6m: Tied with at least 5 knots, divided into 3 groups (2-1-2 layout).
- Lengths ≥ 3m: Tied with at least 3 bands (1-1-1 layout).
- Wooden Box Package:
- Specifically suited for cold-rolled / cold-drawn seamless steel tubes and polished tubes to prevent surface damage.
- OD ≥ 10mm: Maximum container weight is 50kg.
- OD < 10mm: Maximum container weight is 30kg.
- Reinforced with wooden slats, inner polyethylene sheets, steel wire/hoops, and polyethylene plugs.