Why Choose Carbon Steel? The Smart Engineering Choice
Carbon steel seamless pipes remain the most widely used piping material worldwide for good reason:
Excellent Strength-to-Weight Ratio: High tensile and yield strength for structural integrity
Cost-Effective Solution: Most economical choice for numerous applications
Good Machinability & Weldability: Easy to fabricate and install
Wide Temperature Range: Performs well from cryogenic to elevated temperatures
Proven Reliability: Decades of proven performance in critical applications
Versatile Applications: Suitable for pressure, structural, mechanical, and general purposes
Our Carbon Steel Portfolio: Grades for Every Application
BENKOO METAL supplies a comprehensive range of carbon steel grades, from basic carbon steels to specialized alloy steels for high-temperature service.
Standard Carbon Steel Grades
Grade Designation | Standard | Key Features | Typical Applications |
ASTM A106 Gr.B | ASTM A106 / ASME SA106 | Most common grade for high-temperature service. Min yield: 240 MPa, Tensile: 415 MPa. | Power plants, refineries, high-temperature piping systems |
ASTM A53 Gr.B | ASTM A53 | General purpose grade for mechanical and pressure applications. Available in Type E (ERW) and Type S (Seamless). | Structural applications, plumbing, low-pressure steam lines |
API 5L Gr.B | API 5L / ISO 3183 | Standard pipeline grade for oil and gas transportation. Available in PSL1 and PSL2. | Oil and gas transmission pipelines, gathering lines |
DIN 1626 St 37.0 | DIN 1626 | German standard for structural steel tubes. Good weldability and formability. | Construction, mechanical engineering, structural components |
DIN 1626 St 52.0 | DIN 1626 | Higher strength structural steel with min yield of 355 MPa. | Heavy construction, bridges, crane structures |
JIS G3454 STPG 370 | JIS G3454 | Japanese standard for carbon steel pipes for pressure service. | General pressure service, boiler tubes, heat exchangers |
High-Temperature & Alloy Steel Grades
Grade Designation | Standard | Key Features & Composition | Maximum Service Temperature |
ASTM A335 Gr.P5 | ASTM A335 / ASME SA335 | 5% Chromium, 0.5% Molybdenum alloy. Good oxidation resistance. | Up to 650°C (1200°F) |
ASTM A335 Gr.P11 | ASTM A335 / ASME SA335 | 1.25% Chromium, 0.5% Molybdenum alloy. Intermediate creep strength. | Up to 650°C (1200°F) |
ASTM A335 Gr.P22 | ASTM A335 / ASME SA335 | 2.25% Chromium, 1% Molybdenum. Excellent high-temperature properties. | Up to 650°C (1200°F) |
ASTM A335 Gr.P6 | ASTM A335 / ASME SA335 | 4-6% Chromium, 0.45-0.65% Molybdenum alloy. Good oxidation and corrosion resistance at medium-high temperatures. | Up to 650°C (1200°F) |
ASTM A335 Gr.P9 | ASTM A335 / ASME SA335 | 9% Chromium, 1% Molybdenum. Superior oxidation resistance and strength. | Up to 700°C (1290°F) |
ASTM A335 Gr.P91 | ASTM A335 / ASME SA335 | 9% Chromium, 1% Molybdenum with Vanadium and Niobium. High creep rupture strength. | Up to 700°C (1290°F) |
DIN 17175 St 35.8 | DIN 17175 | German standard for seamless tubes of heat-resistant steels. | Up to 450°C (840°F) |
EN 10216-2 P235GH | EN 10216-2 | European standard for non-alloy steel tubes for pressure purposes. | Up to 300°C (570°F) |
Global Standards & Quality Assurance
BENKOO METAL carbon steel pipes are manufactured and certified to comply with the world's most recognized standards.
Comprehensive Standards Coverage
Region/System | Standard Number | Title / Description |
American (ASTM/ASME) | ASTM A106 / ASME SA106 | Seamless Carbon Steel Pipe for High-Temperature Service |
| ASTM A53 / ASME SA53 | Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless |
| ASTM A333 / ASME SA333 | Seamless and Welded Steel Pipe for Low-Temperature Service |
| ASTM A335 / ASME SA335 | Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service |
| ASTM A213 / ASME SA213 | Seamless Ferritic and Austenitic Alloy-Steel Boiler Tubes |
European (EN/DIN) | EN 10216-1 | Seamless steel tubes for pressure purposes – Part 1: Non-alloy steel tubes with specified room temperature properties |
| EN 10216-2 | Seamless steel tubes for pressure purposes – Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties |
| DIN 1626 | Seamless circular steel tubes for structural steel purposes – Technical delivery conditions |
| DIN 17175 | Seamless tubes of heat-resistant steels – Technical delivery conditions |
Japanese (JIS) | JIS G3454 | Carbon steel pipes for pressure service |
| JIS G3455 | Carbon steel pipes for high temperature service |
| JIS G3456 | Carbon steel pipes for low temperature service |
| JIS G3461 | Boiler and heat exchanger carbon steel tubes |
International | ISO 3183 | Petroleum and natural gas industries – Steel pipe for pipeline transportation systems |
| API 5L | Specification for Line Pipe |
| ASME B36.10M | Welded and Seamless Wrought Steel Pipe (Dimensional Standard) |
Rigorous Quality Control at BENKOO METAL
Every pipe undergoes comprehensive testing:
Hydrostatic Testing: 100% tested per applicable standard requirements
Non-Destructive Testing: Ultrasonic (UT) or Eddy Current testing as specified
Mechanical Testing: Tensile, yield strength, elongation, bend tests
Chemical Analysis: Full compositional verification
Dimensional Inspection: OD, wall thickness, length, straightness
Visual Inspection: Surface quality and defect check
Certification: EN 10204 3.1/3.2 Material Test Certificates provided
Application Spotlight: Where Our Pipes Excel
Industry | Typical Applications | Recommended BENKOO METAL Grades |
Oil & Gas | Gathering lines, transmission pipelines, refinery process piping, well casing, structural supports | API 5L Gr.B, ASTM A106 Gr.B, ASTM A53 Gr.B |
Power Generation | Boiler tubes, steam lines, feedwater piping, heat exchangers, condenser tubes | ASTM A106 Gr.B, ASTM A335 (P11, P22, P91), ASTM A213 |
Construction | Structural columns, scaffolding, piling, mechanical supports, architectural elements | ASTM A53 Gr.B, DIN 1626 St 37/52, EN 10210 S355J2H |
Chemical Processing | Process piping (non-corrosive), utility lines, vent systems, equipment supports | ASTM A106 Gr.B, ASTM A53 Gr.B, ASTM A333 (low temp) |
Shipbuilding | Marine piping systems, structural components, machinery foundations | ASTM A53 Gr.B, ASTM A106 Gr.B, DIN 1626 |
Automotive & Machinery | Hydraulic cylinders, machine frames, conveyor components, transport equipment | ASTM A53 Gr.B, DIN 1626, EN 10216-1 |
Special Focus: High-Temperature Applications
For applications involving elevated temperatures, BENKOO METAL offers specialized alloy steel grades:
ASTM A335 Gr.P6: Excellent choice for medium-high temperature service with good oxidation resistance
ASTM A335 Gr.P91: The premium choice for ultra-supercritical power plants
All P-grade alloys: Ideal for refinery furnaces, power plant boilers, and high-temperature process piping
Why choose our high-temperature pipes?
Superior creep resistance
Excellent oxidation resistance
Maintain strength at elevated temperatures
Cost-effective alternative to stainless steels in certain applications
The BENKOO METAL Advantage
When you choose BENKOO METAL, you get more than just pipes – you get a reliable partner committed to your success.
Wide Size Range: From 6mm to 508mm OD, wall thickness up to 120mm
Complete Certification: Full traceability with mill test certificates
Technical Expertise: Our engineers help select the right grade for your application
Global Logistics: Efficient shipping to any destination worldwide
Competitive Pricing: High-quality products at market-competitive prices
Custom Solutions: Tailored cutting, beveling, threading, and other services
Quality Guarantee: Every pipe meets or exceeds specified standards
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