Seamless Pressure Pipe
Carbon steel seamless pressure pipes to ASTM A106 / A53 / EN 10216 for high-temperature and high-pressure service. Pierced from solid billet — no weld seam — for refineries, power plants, and process piping worldwide.
ASTM A106 Gr.A/B/C
ASTM A53 Type S
EN 10216-1/-2
SCH 5S–XXS
Seamless Pressure Pipe
Seamless pressure pipe is designed to carry fluids under high temperature and pressure in refineries, petrochemical plants, power stations, and boiler systems. CREATEEL supplies seamless carbon steel pressure pipe to ASTM A106 Gr.A/B/C and ASTM A53 Type S, together with EN 10216-1/-2 equivalents — all pierced from solid round billets with a uniform, weld-free structure. Suitable for ASME B31.1 power piping and B31.3 process piping designs, every order ships with EN 10204 3.1 mill test certificates.
- OD Range: 10.2mm – 720mm (1/4″ – 36″)
- Wall Thickness: 1.65mm – 60mm (SCH 5S – XXS)
- Grade: ASTM A106 Gr.A/B/C, A53 Gr.B, P235GH, P265GH, 20#
- Length: SRL 3–7m, DRL 6–18m, custom cut lengths
- Standard: ASTM A106, ASTM A53, EN 10216-1/-2, GB/T 8163, JIS G3454
Technical Specifications
Standards
Seamless carbon steel pressure pipe standards and common grades supplied by CREATEEL.
| Standard | Available Steel Grades | Description |
|---|---|---|
| ASTM A106 | Gr.A, Gr.B, Gr.C | Standard specification for seamless carbon steel pipe for high-temperature service |
| ASTM A53 | Gr.A, Gr.B (Type S, seamless) | Standard specification for black and hot-dipped galvanized steel pipe |
| EN 10216-1 | P235TR1, P235TR2, P265TR1 | European standard for seamless steel tubes for pressure purposes at room temperature |
| EN 10216-2 | P235GH, P265GH | European standard for seamless steel tubes with specified elevated temperature properties |
| GB/T 8163 | 10#, 20#, Q345 | Chinese national standard for seamless steel pipes for fluid transport service |
| JIS G3454 | STPG370, STPG410 | Japanese standard for carbon steel pipes for pressure service |
Seamless Pressure Pipe Dimensions (OD × Wall Thickness, NPS)
Wall thickness in mm per ASME B36.10M, for A106 Gr.B / EN 10216 seamless pressure pipe. – = not a standard schedule for that size. OD up to 720 mm on request.
| DN | NPS (in) | OD (mm) | SCH10 | SCH20 | STD | SCH40 | XS | SCH80 | SCH160 |
|---|---|---|---|---|---|---|---|---|---|
| 15 | 1/2 | 21.3 | 1.65 | – | 2.77 | 2.77 | 3.73 | 3.73 | 4.78 |
| 20 | 3/4 | 26.7 | 2.11 | – | 2.87 | 2.87 | 3.91 | 3.91 | 5.56 |
| 25 | 1 | 33.4 | 2.77 | – | 3.38 | 3.38 | 4.55 | 4.55 | 6.35 |
| 32 | 1-1/4 | 42.2 | 2.77 | – | 3.56 | 3.56 | 4.85 | 4.85 | 6.35 |
| 40 | 1-1/2 | 48.3 | 2.77 | – | 3.68 | 3.68 | 5.08 | 5.08 | 7.14 |
| 50 | 2 | 60.3 | 2.77 | – | 3.91 | 3.91 | 5.54 | 5.54 | 8.74 |
| 65 | 2-1/2 | 73.0 | 3.05 | – | 5.16 | 5.16 | 7.01 | 7.01 | 9.53 |
| 80 | 3 | 88.9 | 3.05 | – | 5.49 | 5.49 | 7.62 | 7.62 | 11.13 |
| 100 | 4 | 114.3 | 3.05 | – | 6.02 | 6.02 | 8.56 | 8.56 | 13.49 |
| 125 | 5 | 141.3 | 3.4 | – | 6.55 | 6.55 | 9.53 | 9.53 | 15.88 |
| 150 | 6 | 168.3 | 3.4 | – | 7.11 | 7.11 | 10.97 | 10.97 | 18.26 |
| 200 | 8 | 219.1 | 3.76 | 6.35 | 8.18 | 8.18 | 12.7 | 18.26 | 23.01 |
| 250 | 10 | 273.0 | 4.19 | 6.35 | 9.27 | 15.09 | 12.7 | 20.62 | 28.26 |
| 300 | 12 | 323.9 | 4.57 | 6.35 | 9.53 | 14.27 | 12.7 | 21.44 | 33.32 |
| 350 | 14 | 355.6 | 4.78 | 7.92 | 9.53 | – | 12.7 | 23.83 | – |
| 400 | 16 | 406.4 | 4.78 | 7.92 | 9.53 | – | 12.7 | 21.44 | – |
| 450 | 18 | 457.0 | 4.78 | 7.92 | 9.53 | – | 12.7 | 23.83 | – |
| 500 | 20 | 508.0 | 4.78 | 7.92 | 9.53 | – | 12.7 | 20.62 | – |
| 600 | 24 | 610.0 | – | – | 9.53 | – | 12.7 | 17.02 | – |
Chemical Composition (%)
Ladle analysis per heat. Full mill test certificate with heat traceability provided.
| Grade | C | Mn | Si | P | S |
|---|---|---|---|---|---|
| ASTM A106 Gr.A | ≤0.25 | 0.27–0.93 | ≥0.10 | ≤0.035 | ≤0.035 |
| ASTM A106 Gr.B | ≤0.30 | 0.29–1.06 | ≥0.10 | ≤0.035 | ≤0.035 |
| ASTM A106 Gr.C | ≤0.35 | 0.29–1.06 | ≥0.10 | ≤0.035 | ≤0.035 |
| ASTM A53 Gr.B | ≤0.30 | ≤1.20 | — | ≤0.05 | ≤0.045 |
| 20# (GB/T 699) | 0.17–0.23 | 0.35–0.65 | 0.17–0.37 | ≤0.035 | ≤0.035 |
Mechanical Properties
Minimum values at room temperature, as per the referenced standards. Values may vary with wall thickness and heat treatment condition.
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| ASTM A106 Gr.A | ≥330 | ≥205 | ≥35 |
| ASTM A106 Gr.B | ≥415 | ≥240 | ≥30 |
| ASTM A106 Gr.C | ≥485 | ≥275 | ≥20 |
| ASTM A53 Gr.B | ≥415 | ≥240 | ≥25 |
| P235GH (EN 10216-2) | 360–480 | 235–265 | ≥24 |
Testing & Certification
Quality assurance applied to every seamless pressure pipe order.
Hydrostatic Test
Every length pressure-tested per the applicable standard section or purchaser requirement.
Ultrasonic Examination
100% ultrasonic testing of body and ends; eddy current testing for small-diameter sizes.
Impact Testing
Charpy V-notch impact tests available on request for low-temperature service requirements.
Certification
EN 10204 3.1 mill test certificate standard with full heat traceability; 3.2 third-party inspection (SGS / BV / TÜV) on request.
Heat Treatment
Hot-rolled (as-rolled) as standard; normalizing or isothermal annealing on request; cold-drawn pipes always heat-treated per ASTM A106.
Marking & Packing
Standard stencilling per specification; bundled with steel straps, end protectors, wrapped for sea freight.
Manufacturing Process
Our seamless steel pipes are manufactured through a rigorously controlled 12-step hot rolling process — from billet heating to final inspection — ensuring uniform mechanical properties, precise dimensions, and defect-free surfaces.
Billet Inspection & Cutting
Continuous-cast round billets are ultrasonically tested for internal defects, then cut to required lengths by abrasive sawing or shearing.
Rotary Hearth Heating
Billets are heated uniformly to 1200–1280°C in a rotary hearth furnace to achieve optimal plasticity for piercing while preventing overheating or decarburization.
Mannesmann Piercing
The heated billet is pierced over a pointed mandrel between two skewed rolls to form a hollow shell (mother tube), typically achieving a 3–4:1 elongation ratio.
Mandrel Mill Rolling
The hollow shell is rolled over a retained mandrel through a 5–8 stand continuous mandrel mill to reduce wall thickness and achieve uniform OD/WT dimensions.
Mandrel Extraction & Reheating
The mandrel is stripped from the shell; the shell is then reheated to ~950°C in an induction furnace before entering the stretch-reducing mill.
Stretch Reducing / Sizing
The pipe passes through 20–24 stands of stretch-reducing mill to achieve the final OD with tight tolerance (±0.5% OD) and uniform wall thickness, without an internal mandrel.
Cooling Bed Cooling
Pipes are transferred to a walking-beam cooling bed for slow, uniform air cooling to prevent bending and residual stress buildup.
Hot/Cold Straightening
Pipes are straightened by multi-roll cross-roll straighteners (6-roll or 10-roll) to achieve straightness ≤1 mm/m and eliminate ovality.
Cutting & End Facing
Pipes are cut to commercial lengths (5.8m/6m/11.8m/random) and both ends are faced and beveled (30°+5°) for welding, with burrs removed.
NDT & Hydrostatic Testing
100% ultrasonic testing for wall thickness and laminations, eddy current testing for surface cracks, and hydrostatic pressure testing to API/GB standards.
Surface Inspection & Marking
Visual and dimensional inspection of OD, WT, length, and surface quality; stenciling grade, heat number, OD×WT, standard, and manufacturer mark.
Final Packaging & Shipping
Pipes are bundled with steel strips, end-protected with plastic caps or bevel protectors, slung with lifting tags, and loaded for shipment with mill test certificates.
Applications
Where seamless pressure pipe delivers proven performance across industries worldwide.
Refinery Process Piping
ASME B31.3 process lines carrying hydrocarbons, hydrogen, and steam at elevated temperature and pressure throughout the refinery.
✓ ASTM A106 Gr.B / Gr.C
Power Plant Piping
Main steam, feedwater, and blowdown piping designed to ASME B31.1 where a homogeneous weld-free wall is critical for safety.
✓ ASME SA106 / B31.1
Boiler External Piping
High-energy piping in boiler external lines and headers, supplied heat-treated with impact testing available on request.
✓ EN 10216-2 P235GH
Petrochemical Units
Reformer, heat exchanger interconnect, and hot-oil circuit piping requiring tight chemistry control and consistent high-temperature strength.
✓ 100% UT + hydro tested
Hydraulic & Instrumentation
Small-bore high-pressure tubing for hydraulic power units and instrument impulse lines, with smooth bore and tight tolerance cold-drawn options.
✓ Cold-drawn available
Structural Thick-Wall
Heavy machinery, crane booms, and load-bearing members where thick-wall welded tube is insufficient and forgings are unnecessary.
✓ Up to XXS wall
Frequently Asked Questions
What is seamless pressure pipe?＋
Pipe pierced from a solid round billet — no weld seam — designed to carry fluids under high temperature and pressure per ASTM A106, ASTM A53, and EN 10216. Used in refineries, power plants, and process piping.
What is the difference between ASTM A106 and A53?＋
A53 covers both welded and seamless pipe for ordinary service; A106 is seamless-only and intended for high-temperature service with stricter chemistry and testing. Most refinery and power piping specs call for ASTM A106 Gr.B.
Which grade should I choose?＋
Gr.B is the industry workhorse for most pressure service. Gr.A offers better cold bending and forming; Gr.C provides higher strength for higher design pressures.
What heat treatment condition do you supply?＋
Hot-rolled (as-rolled) as standard. Normalizing or isothermal annealing available on request. Cold-drawn pipes are always heat-treated in accordance with ASTM A106.
What test certificates are included?＋
EN 10204 3.1 mill test certificate with full heat traceability as standard. 3.2 certification with third-party inspection (SGS / BV / TÜV) available on request.
What is the MOQ and lead time?＋
5–10 tons per size depending on specification. Stock sizes ship within 7 days; produced sizes in 4–8 weeks. Contact us for a firm quotation.
Ready to Order Seamless Pressure Pipes?
Get competitive pricing on ASTM A106 / A53 seamless pressure pipes. Mill test certificates included — third-party inspection welcome.
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