Seamless Carbon Steel Pipe - High-Pressure Industrial Grade

Kuaima Steel Co., Ltd.

Verified Custom manufacturer 7yrs

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Technical Specifications of Seamless Carbon Steel Pipe

Property	Parameter	Description
Product Name	Seamless Carbon Steel Pipe	Hot-rolled or cold-drawn carbon steel pipe without weld seam
Material Grade	ASTM A106 Gr.B / ASTM A53 Gr.B / API 5L Gr.B	International grade equivalents
Standard Compliance	ASTM A106, ASTM A53, API 5L, ASME SA106, DIN 17175	Meets major international standards
Manufacturing Process	Hot-rolled / Cold-drawn	Seamless pipe forming methods
Carbon (C)	≤0.30%	Primary strengthening element
Manganese (Mn)	0.29–1.06%	Improves hardenability and tensile strength
Phosphorus (P)	≤0.035%	Controlled for improved ductility
Sulfur (S)	≤0.035%	Low sulfur ensures good weldability
Silicon (Si)	≥0.10%	Acts as deoxidizer and strengthener
Tensile Strength	≥415 MPa	Minimum value per ASTM A106 Gr.B
Yield Strength	≥240 MPa	Minimum value per ASTM A106 Gr.B
Elongation	≥30%	Ductility in 50mm gauge length
OD Range	6mm – 914mm (1/8'' – 36'')	Available outer diameter options
Wall Thickness	1mm – 120mm (SCH 10 – SCH XXS)	Standard and custom wall thickness
Length	5.8m – 12m or custom	Random, fixed, or cut-to-length available
Surface Treatment	Black painted, oiled, varnished, galvanized	Multiple anti-corrosion options
Application	Oil & gas, power plants, boilers, structural, mechanical	Suitable for high-temperature and high-pressure service
Certification	EN 10204 3.1, ISO 9001, API 5L, PED 2014/68/EU	Quality certifications provided
Packaging	Bundled with steel strips, plastic caps on ends	Standard seaworthy export packaging
MOQ	5 tons	Minimum order quantity

Seamless Carbon Steel Pipe - High-Pressure Industrial Grade

Seamless carbon steel pipe is a critical tubular product manufactured without welded seams, delivering superior pressure containment and mechanical integrity for demanding industrial service. Produced through hot rolling or cold drawing processes per ASTM A106/A53 specifications, this pipe serves as the preferred choice for oil and gas transmission, power generation, and high-temperature process piping where weld-seam failures are unacceptable. Our mill-direct supply ensures factory-competitive pricing with full traceability for global procurement teams and project contractors.

What Is Seamless Carbon Steel Pipe?

Seamless carbon steel pipe is a hollow steel product formed from a solid round billet that is heated and pierced over a mandrel to create a tube without any longitudinal or spiral weld joint. This manufacturing method produces a homogeneous grain structure throughout the pipe wall, resulting in superior strength uniformity and enhanced resistance to internal pressure compared to welded alternatives.

Seamless carbon steel pipe supplier

Seamless Carbon Steel Pipe Technical Specifications

Our seamless carbon steel pipes comply with ASTM A106 Grade B and ASTM A53 Grade B standards. Key parameters include a minimum tensile strength of 415 MPa and minimum yield strength of 240 MPa per ASTM A106/A106M-18. Carbon content is controlled at 0.30% maximum, with manganese ranging from 0.29% to 1.06%. Available outside diameters span from 21.3 mm (1/2") to 610 mm (24"), with wall thicknesses from Schedule 20 through Schedule XXS. Pipe lengths are supplied in single random (5–7 m) or double random (9–13 m) as required.

Property	ASTM A106 Gr.B	ASTM A53 Gr.B
Tensile Strength (min)	415 MPa	415 MPa
Yield Strength (min)	240 MPa	240 MPa
Carbon (max)	0.30%	0.30%
Service Temperature	Up to 425°C	Up to 340°C

Key Applications of Seamless Carbon Steel Pipe

Oil and gas drilling, transmission, and refinery process piping
Boiler tubes and superheater lines in thermal power plants per ASME B31.1
High-pressure hydraulic systems and mechanical structural components
Chemical processing and petrochemical plant piping networks
Water treatment and fire protection systems requiring robust pressure ratings

Why Choose Our Seamless Carbon Steel Pipe

Every pipe ships with EN 10204 Type 3.1 Mill Test Certificates documenting chemical composition and mechanical test results. Our production facilities maintain ISO 9001:2015 certification, and products undergo 100% non-destructive testing including hydrostatic testing per ASTM A530 and ultrasonic examination per ASTM E213. For applications requiring enhanced corrosion protection, consider our anti-corrosion coated pipe or alloy steel seamless pipe options.

Frequently Asked Questions

What is the minimum order quantity (MOQ)?

Our standard MOQ is 1 metric ton per size and specification. For project-based orders requiring multiple dimensions, we accommodate mixed containers with a combined minimum of 5 metric tons.

Do you provide material test certificates?

Yes. Every shipment includes EN 10204 Type 3.1 Mill Test Certificates covering chemical analysis, mechanical properties, hydrostatic test results, and NDE reports as applicable.

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What is the typical delivery time?

Stock items in common sizes ship within 7–10 business days. Custom-manufactured seamless carbon steel pipe with specific wall thicknesses or non-standard lengths typically requires 25–35 days from order confirmation.

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Can you cut to custom sizes?

Absolutely. We offer precision cutting to fixed lengths with tolerances of ±5 mm, beveled ends per ASME B16.25, and custom marking per client specifications at no additional lead time for stocked inventory.

Get a Competitive Quote for Seamless Carbon Steel Pipe

Ready to source premium-grade seamless carbon steel pipe for your next project? Contact our technical sales team with your required specifications—including size, schedule, grade, quantity, and delivery destination—and receive a detailed quotation within 24 hours. We support FOB, CFR, and CIF terms to major international ports worldwide.

Ratings & Reviews

5.0

Very satisfied

Based on 8 reviews for verified purchases

Supplier service

5.0

On-time shipment

5.0

Supplier service

5.0

Chris Martin

Canada

verified purchases

2025-09-18

Acceptable Seamless Pipe Quality — Dimensional Issue Resolved
Ordered 5 tons of ASTM A106 Gr.B seamless pipe, 4-inch Schedule 120, for a high-pressure chemical processing line in Alberta. Chemical and mechanical properties on the MTCs were compliant. However, wall thickness measurements on 4 pipe lengths fell slightly below the Schedule 120 nominal — outside our acceptance tolerance. Raised the issue with the sales team and received a replacement shipment for the affected pieces within 14 days at no additional cost. Resolution was handled professionally. Overall quality control on dimensional inspection needs tightening, but the after-sales response was satisfactory.

Wei Chen

Singapore

verified purchases

2025-10-05

Solid Seamless Pipe Supply with Competitive FOB Pricing
Procured 22 tons of seamless carbon steel pipe across multiple schedules — Sch 40 and Sch 80 — in 2-inch through 6-inch OD range for redistribution to Southeast Asian EPC contractors. ASTM A106 Gr.B MTCs were complete and passed our in-house document review. FOB pricing was competitive when benchmarked against three other mill-direct suppliers we regularly work with. Minor point: heat number marking on some pipe lengths was faint and required re-marking before client delivery. Supplier acknowledged the feedback. Documentation and material quality are the main reasons we will continue sourcing from this supplier.

William Taylor

Australia

verified purchases

2025-10-27

Good Value Seamless Carbon Steel Pipe for Petrochemical Piping
Sourced 6 tons of seamless carbon steel pipe, 5-inch Schedule 80, ASTM A106 Gr.B for a petrochemical plant piping network in Western Australia. Material quality and MTCs were fully compliant — tensile and yield values confirmed, NDE clear. Delivery took 13 business days rather than the 10-day estimate for stock items, which caused a minor scheduling adjustment on site. Supplier proactively communicated the delay 3 days in advance, which was appreciated. Overall value for the certified material grade remains strong and we would order again with a buffer in the project schedule.

Carlos Silva

Brazil

verified purchases

2025-11-13

Reliable A53 Gr.B Seamless Pipe for Water Treatment Infrastructure
Ordered 10 tons of ASTM A53 Grade B seamless pipe, 3-inch and 4-inch diameters, Schedule 40, for a municipal water treatment plant expansion. Pipe surfaces were clean with no visible laminations or seams. MTCs confirmed carbon at 0.26% and tensile strength at 422 MPa. Custom cutting to fixed 6-meter lengths was completed accurately. CFR Santos port delivery was completed in 31 days from order confirmation, within the 25–35 day window for custom-cut stock. Pricing was approximately 8% lower than our previous local distributor for equivalent certified material.

Ahmed Al-Hassan

UAE

verified purchases

2025-12-05

Premium Seamless Pipe Delivered On Time for Offshore Gas Project
Placed a mixed-container order totaling 18 tons covering three sizes — 3-inch Sch 40, 6-inch Sch 80, and 8-inch Sch 40 — all ASTM A106 Gr.B for an offshore gas transmission project in the Arabian Gulf. All three sizes were confirmed in stock and shipped within 8 business days on CIF terms to Jebel Ali. MTCs included hydrostatic pressure test results and NDE reports as required by our project specification. Project QA team reviewed the documentation and approved without any NCR. Will be issuing an RFQ for the next project phase covering approximately 35 tons.

Hans Mueller

Germany

verified purchases

2025-12-26

Outstanding Seamless Carbon Steel Pipe for High-Pressure Hydraulic System
Purchased 8 tons of seamless pipe, 2-inch OD, Schedule XXS, ASTM A106 Gr.B for a high-pressure hydraulic manifold assembly. Pipe ends were bevel-cut per ASME B16.25 with ±3 mm tolerance — tighter than the ±5 mm quoted. Chemical composition on MTCs showed manganese at 0.88%, consistent across all heat numbers in the batch. ISO 9001:2015 certification documentation was provided alongside shipment. Compared pricing from four suppliers before placing this order; FOB price was the most competitive while documentation quality was on par with European mills.

James Wilson

United Kingdom

verified purchases

2026-01-02

Superior Seamless Pipe Quality for Power Station Boiler Lines
Sourced 12 tons of seamless carbon steel pipe in 4-inch Schedule 160 for superheater replacement at a thermal power station operating under ASME B31.1. EN 10204 Type 3.1 MTCs were fully traceable and showed yield strength of 262 MPa. Ultrasonic examination reports confirmed zero defect indications across the batch. Previously used two European mills — this supplier matched quality at a noticeably more competitive CIF price. Technical sales team responded to our dimensional queries within the same business day.

Michael Johnson

United States

verified purchases

2026-01-17

Excellent A106 Gr.B Seamless Pipe for Refinery Expansion
Ordered 28 tons of ASTM A106 Grade B seamless carbon steel pipe, 6-inch OD, Schedule 80, in double random lengths for our refinery process piping upgrade. Mill Test Certificates confirmed carbon content at 0.28% and tensile strength at 438 MPa — both well within spec. Hydrostatic test reports were included without request. Delivery completed in 9 business days, ahead of the 10-day commitment. This is our second order this quarter and we are already planning a third for the next phase.