Description
Direct Mill Supply, Zero Broker Markup — XJY Structure produces 20# and 45# seamless carbon steel pipe on our own rolling lines, cutting out trading layers and keeping full material traceability from billet to finished pipe.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | 20# 45# Seamless Carbon Steel Pipe |
| Product Type | Seamless Steel Pipe |
| Steel Grade | 20#, 45#, ASTM A106 Grade A/B |
| Standard | ASTM A106, API 5CT, API 5L, JIS, BS, DIN |
| Section Shape | Round |
| Outer Diameter | 10–609 mm |
| Wall Thickness | 1.65–59.54 mm |
| Technique | Hot Rolled / Cold Rolled / Cold Drawn |
| Surface Treatment | Hot Rolled, Oiled / Non-oiled |
| Tolerance | ±5%, ±1% |
| Ends | Plain / Beveled (per standard) |
| Delivery Time | 8–14 days |
| Invoicing | By Theoretical Weight |
| Packing | Standard Export Seaworthy Package |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Oil & Gas | Downhole tubing, flow lines, gathering pipelines per API 5CT and API 5L |
| Power & Energy | High-pressure steam headers, boiler tubes, superheater elements per ASTM A106 |
| Chemical Processing | Reactor feed lines, heat exchanger tubes, fertilizer plant piping |
| Machinery & Equipment | Hydraulic cylinder barrels, pump shafts, rotating drill components |
| Infrastructure & EPC | Structural columns, pile casings, piperack supports in industrial plants |
What Negative Tolerance Really Costs on a Boiler Tube Order
Theoretical weight invoicing hides real wall loss when tolerance runs wide.
Procurement teams ordering ASTM A106 seamless carbon steel pipe from overseas often discover the gap between invoice weight and actual received tonnage only after third-party inspection at destination. A batch that looks competitive on price per ton can silently deliver thinner walls — pushing material below the minimum required by design codes. I once watched an entire container of 20# thick-wall pipe get rejected at复检 because the actual wall fell outside the ±5% band; the supplier had leaned into negative tolerance to shave cost. [NEED_CITE: ASTM A106 dimensional tolerance requirements for seamless pipe]
Matching Wall Thickness to Pressure and Temperature Demands
The 1.65–59.54 mm wall range across OD 10–609 mm lets engineers specify ASTM A106 seamless carbon steel pipe for everything from instrument lines to high-pressure boiler headers. Hot-rolled 20# pipe handles moderate-temperature fluid transport, while cold-drawn 45# delivers tighter dimensional control for hydraulic cylinders and machined components where surface finish and concentricity matter. Beveled ends per standard support field welding on pipeline and structural jobs, while plain ends suit threaded connections in oil country applications.
Engineering Compliance Across International Standards
ASTM A106 governs high-temperature service in North American boiler and pressure vessel codes, while API 5L and API 5CT cover onshore transmission and oilfield tubular requirements. [NEED_CITE: ASTM A106 vs API 5L material equivalence for seamless carbon steel] European projects referencing EN standards require full chemical and mechanical documentation traceable to heat number. Our mill test certificates cover both 20# and 45# grades with complete composition data, and third-party inspection through SGS, BV, or TÜV is available before shipment. For EPC contractors, having API certification on file clears customs faster in Middle East and Southeast Asian ports.
Steel Grade Selection: 20# vs 45# and the Carbon Content Trade-off
The 20# grade contains approximately 0.20% carbon, offering good weldability and formability for boiler tubes and fluid lines where the primary demand is pressure containment rather than structural strength. The 45# grade steps up to roughly 0.45% carbon, delivering higher tensile strength and hardness — making it the preferred choice for machined parts, hydraulic piston rods, and drill components that need surface hardness after heat treatment. Both grades run through the same hot-rolling or cold-drawing processes, but cold-drawn 45# pipe holds tighter tolerance (±1% available) compared to hot-rolled 20# at standard ±5%.
Oiled surface treatment prevents flash rust during ocean transit without interfering with downstream welding or coating, while non-oiled finish suits applications where the pipe goes directly into a painted or galvanized system. [NEED_CITE: carbon content effects on weldability in seamless steel pipe]
The Hidden Cost of Unverified Mill Certificates
Buying ASTM A106 seamless carbon steel pipe without traceable heat numbers or independent verification creates risk across the entire project chain. Material that fails chemical composition checks at destination triggers full container rejection — not partial claims. Welding procedures qualified on one grade cannot be transferred to another without requalification, delaying field construction. Dimensional non-conformance on wall thickness forces design recalculation or outright replacement, blowing project schedules. [NEED_CITE: material traceability requirements in ASME pressure vessel codes]
Why Project Teams Source ASTM A106 Seamless Carbon Steel Pipe From Our Mill
XJY Structure operates its own steel production facility with dedicated rolling lines, meaning every pipe we ship carries full traceability back to the original billet heat. We stock over 2,800 specifications across seamless and welded ranges, so 20# and 45# pipe in both hot-rolled and cold-drawn condition ships from our warehouse without waiting for third-party mill allocation. Our in-house quality lab issues EN 10204 3.1/3.2 mill test certificates with every shipment, and we coordinate SGS or BV inspection on site before container sealing. For heavy-wall pipe in the 40–59 mm range, we prepare custom loading plans that distribute weight across container axles and prevent shifting during ocean transit.
Documentation & Compliance
- Mill test certificate documenting 20# and 45# chemical composition including carbon, manganese, silicon, sulfur, and phosphorus content per ASTM A106
- API 5CT / API 5L certification for oil country tubular goods with full heat number traceability
- ISO 9001 quality management certificate covering seamless pipe production and inspection processes
- SGS / BV / TÜV third-party inspection report available upon request for dimensional verification and visual examination
- Material traceability report linking each pipe to billet heat number, rolling date, and test results
- Export customs documentation including packing list, bill of lading, and certificate of origin for destination clearance
Packaging, Loading & Delivery
- Hot-rolled 20# and 45# seamless pipe bundled with steel strips and edge protectors, oiled surface preserved with waterproof wrapping for ocean transit
- Cold-drawn pipe in ±1% tolerance packed individually with anti-rust paper to maintain surface finish and dimensional accuracy
- Heavy-wall pipe above 40 mm loaded with custom cradle supports inside 20ft or 40ft containers to prevent axle overload and shifting
- Beveled-end pipe for API applications fitted with plastic end caps to protect weld preparation geometry during handling
- Heat number and steel grade stenciled on each pipe bundle for on-site identification and traceability verification
- FOB Jinan/Qingdao, CIF destination port, or DDP site delivery with full export documentation and container tracking
Getting Your ASTM A106 Seamless Carbon Steel Pipe Quote Moving
Share your project drawings or pipe schedule with required steel grade (20# or 45#), outer diameter, wall thickness, length, and applicable standard. We return a detailed quotation within 24 hours including material cost, fabrication if needed, coating, packing, and freight options — along with a sample mill test certificate format for your engineer’s review.
Start Your ASTM A106 Pipe Inquiry Today
Send your specifications and destination port to receive pricing, mill test certificate samples, and production lead time confirmation.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjystructure.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
Frequently Asked Questions
Q: What is the difference between 20# and 45# seamless carbon steel pipe for my application?
A: The 20# grade with lower carbon content offers better weldability and is suited for boiler tubes, fluid transport, and pressure containment. The 45# grade provides higher strength and hardness, making it ideal for machined components, hydraulic cylinders, and parts requiring heat treatment. Both grades are available in hot-rolled and cold-drawn conditions across the full OD and wall thickness range.
Q: Can you provide ASTM A106 pipe with API 5L or API 5CT certification for oil and gas projects?
A: Yes, our seamless carbon steel pipe production holds API 5CT and API 5L certification for oil country tubular goods. We supply 20# and 45# grades with full mill test certificates and heat number traceability, meeting the chemical and mechanical requirements for both ASTM A106 high-temperature service and API pipeline applications.
Q: What is your tolerance policy on wall thickness, and how does theoretical weight invoicing work?
A: We offer standard ±5% tolerance on hot-rolled pipe and tighter ±1% tolerance on cold-drawn pipe. Invoicing is by theoretical weight calculated from nominal dimensions per standard formulas. We provide actual measured wall thickness data in our mill test certificates so you can verify compliance before shipment and avoid surprises at destination inspection.
Q: Do you arrange third-party inspection before shipment?
A: Yes, we coordinate SGS, BV, or TÜV inspection at our facility before container loading. The inspection covers dimensional verification, visual examination, surface quality, and witness of any required testing. Inspection reports are included in the shipping documentation package for your records and customs clearance.
Q: What export packing do you use for heavy-wall seamless pipe?
A: Heavy-wall pipe above 40 mm is bundled with steel strips, fitted with edge protectors, and loaded with custom cradle supports inside containers to distribute weight and prevent shifting. Oiled surfaces receive waterproof wrapping, and beveled ends are protected with plastic caps. We prepare detailed loading plans for each container to ensure safe ocean transit.
