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Help CenterCarbon Steel Pipe Supplier – Seamless & Welded OD 5mm – 256mm | WT 1mm – 25mm | Multiple Standards For Fluid Transport, Structure, Boiler, Oil & Gas
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Carbon Steel Pipe Supplier From China– Seamless & Welded OD 5-256mm | WT 0.8-25mm | Multiple StandardsNegotiableMOQ: 1 Metric Ton
Carbon Steel Pipe – Seamless & Welded
OD 5mm – 256mm | WT 1mm – 25mm | Multiple Standards
For Fluid Transport, Structure, Boiler, Oil & Gas
Product Overview
Our carbon steel pipe is manufactured in both seamless and welded (ERW) constructions, covering outer diameters from 5mm to 256mm and wall thicknesses from 0.8mm to 25mm. These pipes are suitable for a wide range of applications including fluid transport, structural frames, boiler systems, oil and gas pipelines, and general engineering.
Key Features:
Wide size range – OD 5mm to 256mm – one-stop sourcing
Seamless or welded – Choose based on pressure requirements
Multiple standards – ASTM, API, EN, DIN, GB
Good weldability – Low carbon content
100% hydrostatic tested – Guaranteed integrity
EN 10204 Type 3.1 MTC with full traceability
✅ Seamless or ERW welded – Both available
✅ Heat treated – Normalized, as-rolled, or stress relieved
✅ 100% hydrostatic tested – Per standard requirements
✅ EN 10204 Type 3.1 MTC provided with heat number
✅ Factory direct | Global shipping
Key Specifications
| Parameter | Details |
|---|---|
| OD Range | 5mm – 256mm (0.197″ – 10.079″) |
| WT Range | 0.8mm – 25mm |
| Length | 4m – 12m (fixed or random) |
| Manufacturing | Seamless (hot rolled/cold drawn) or Welded (ERW) |
| Surface Finish | Black / Bare / Oiled / Painted / Galvanized |
| End Finish | Plain / Beveled / Threaded |
| Delivery Condition | As-rolled / Normalized / Stress relieved / Cold drawn |
Available Grades & Standards
| Standard | Grade | Type | Application |
|---|---|---|---|
| ASTM A106 | Gr.B, Gr.C | Seamless | High temperature service |
| ASTM A53 | Gr.B | Seamless / Welded | General pressure piping |
| API 5L | Gr.B, X42, X52, X60, X65, X70 | Seamless / Welded | Oil & gas pipelines |
| EN 10216-1 | P195, P235, P265 | Seamless | Pressure purposes (room temp) |
| EN 10216-2 | P235GH, P265GH, 16Mo3, 13CrMo4-5 | Seamless | Pressure purposes (elevated temp) |
| GB/T 8163 | 10#, 20#, Q345 | Seamless | Fluid transport |
| GB/T 5310 | 20G, 15CrMoG, 12Cr1MoVG | Seamless | High pressure boiler |
| GB/T 3087 | 10#, 20# | Seamless | Low & medium pressure boiler |
Chemical Composition (Typical – Grade 20# / A106 Gr.B)
| Element | C | Si | Mn | P max | S max |
|---|---|---|---|---|---|
| Requirement | 0.17-0.23 | 0.17-0.37 | 0.35-0.65 | 0.035 | 0.035 |
💡 Low carbon content ensures excellent weldability and formability for general applications.
Mechanical Properties (Typical – Grade 20# / A106 Gr.B)
| Property | Value |
|---|---|
| Tensile Strength | 410 – 550 MPa |
| Yield Strength | ≥245 MPa |
| Elongation | ≥20% |
| Hardness | ≤150 HB |
Grade Selection Guide
| Application | Recommended Grade | Standard | Type |
|---|---|---|---|
| General fluid transport | 20#, A106 Gr.B | GB/T 8163, ASTM A106 | Seamless |
| High pressure boiler | 20G, A192 | GB/T 5310, ASTM A192 | Seamless |
| Oil & gas pipeline | X52, X65 | API 5L | Seamless / Welded |
| Structural support | Q345, S355J2H | GB/T 8162, EN 10210 | Seamless / Welded |
| Hydraulic cylinder | E355, ST52 | EN 10305, DIN 2391 | Cold drawn seamless |
| Low pressure water/gas | Gr.B | ASTM A53 | ERW welded |
Available Sizes – Carbon Steel Pipe
| OD (mm) | WT Range (mm) | Typical Standard | Application |
|---|---|---|---|
| 5 – 20 | 0.8 – 2.5 | GB/T 8163 | Instrumentation, small bore |
| 20 – 50 | 1.5 – 5.0 | ASTM A106, GB/T 8163 | General fluid lines |
| 50 – 100 | 2.0 – 8.0 | API 5L, GB/T 5310 | Gathering lines, boiler tubes |
| 100 – 200 | 3.0 – 15.0 | API 5L, ASTM A106 | Transmission lines, steam pipes |
| 200 – 256 | 4.0 – 25.0 | API 5L, EN 10216 | Large diameter pipelines |
💡 Most popular sizes: 60.3mm, 76mm, 88.9mm, 114.3mm, 168.3mm, 219.1mm OD
Applications – Carbon Steel Pipe
| Industry | Application | Recommended Grade |
|---|---|---|
| Oil & Gas | Gathering, transmission, distribution | API 5L X42-X70 |
| Power Generation | Boiler tubes, steam lines | A106 Gr.B, 20G, 20# |
| Petrochemical | Process piping, heat exchangers | A106 Gr.B, P235GH |
| Construction | Structural frames, scaffolding | Q345, S355J2H |
| Water Treatment | Water supply, sewage | A53 Gr.B, 20# |
| Hydraulic Systems | Cylinder barrels, hydraulic lines | E355, ST52 |
| General Engineering | Machinery parts, supports | 20#, Q235B |
Quality Assurance & Testing
| Test | Method | Coverage |
|---|---|---|
| Hydrostatic Test | Water pressure | 100% |
| Ultrasonic Testing (UT) | Non-destructive | By agreement |
| Eddy Current (ET) | Non-destructive | By agreement |
| Tensile Test | EN ISO 6892-1 | Per lot |
| Flattening Test | Ductility | Per lot |
| Flaring Test | Tube end expansion | Per lot |
| Dimensional Inspection | Micrometer | 100% |
| Visual Examination | Direct | 100% |
Mill Test Certificate
EN 10204 Type 3.1 MTC – Standard
EN 10204 Type 3.2 – Available upon request (third-party: SGS, BV, TUV)
Traceability: Full traceability from melt to finished pipe
Processing Services
| Service | Description |
|---|---|
| Cutting | Precision cutting to exact length |
| Beveling | For welding preparation (30°-37.5°) |
| Threading | NPT, BSP, or custom threads |
| Bending | Cold or hot bending |
| Surface coating | Oiling, painting, galvanized, 3LPE, FBE |
| Heat treatment | Normalizing, annealing, stress relieving |
Packaging & Shipping
| Item | Details |
|---|---|
| Packaging | Hexagonal bundles or steel crates |
| Protection | Anti-rust oil + plastic end caps |
| Marking | Stencil/spray with Grade, size, heat number, standard |
| Lead time | 7-15 days (stock), 20-30 days (custom) |
| Port | Tianjin / Shanghai / Guangzhou |
Why Choose Our Carbon Steel Pipe?
| Advantage | Description |
|---|---|
| Wide size range | OD 5-256mm – one-stop sourcing |
| Seamless or welded | Both options available |
| Multiple standards | ASTM, API, EN, DIN, GB – all in one place |
| 100% tested | Hydrostatic + NDT per standard |
| Full traceability | EN 10204 3.1 MTC with heat number |
| Factory direct | Competitive pricing |
| Global export | Shipped to over 30 countries |
Contact for Quote
Please provide the following details:
Grade : _______
Standard : ASTM / API / EN / GB / Other _______
Type : Seamless / Welded (ERW)
OD (mm) : _______
WT (mm) : _______
Length (m) : _______
Quantity : _______ (pieces / meters / tons)
Application : _______
Inspection : Standard / Third-party (SGS/BV/TUV)
📧 Email: yjhtrade@gmail.com
📞 WhatsApp: +86 15106174543
🌐 Website: /
Reply within 24 hours.
FAQ – Carbon Steel Pipe
Q1: What is the difference between seamless and welded carbon steel pipe?
A: Seamless – no weld seam, higher pressure rating, higher cost. Welded (ERW) – has a longitudinal weld seam, lower cost, suitable for general applications.
Q2: What is the most common grade for general fluid transport?
A: 20# (GB/T 8163) or ASTM A106 Gr.B – most economical for general applications.
Q3: What is the maximum size available?
A: 256mm OD standard. Larger sizes available upon request.
Q4: Can carbon steel pipe be used for high pressure applications?
A: Yes – seamless grades like A106 Gr.B, API 5L X65, and 20G are suitable for high pressure service.
Q5: Is carbon steel pipe weldable?
A: Yes – excellent weldability. Lower carbon content ensures good weld quality.
Q6: Do you provide third-party inspection?
A: Yes. SGS, BV, TUV, or any customer-specified agency.
Q7: Do you offer free samples?
A: 30cm sample available for common sizes. Shipping fee applies.
Related Products
Seamless Steel Pipe – High pressure applications
ERW Steel Pipe – Cost-effective general purpose
Precision Steel Tube – Hydraulic cylinder applications
Alloy Steel Pipe – High temperature service
Tags: Carbon Steel Pipe Seamless Steel Pipe ERW Steel Pipe ASTM A106 API 5L GB/T 8163 20# Steel Pipe Steel Tube
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Steel Pipe Supplier – Seamless & Welded Carbon Steel & Alloy Steel – OD 5mm – 256mm For Oil & Gas, Power Generation, Construction, Hydraulic, BoilerNegotiableMOQ: 1 Metric Ton
