Seamless Steel Pipe
Seamless steel pipe is formed from a solid billet without a weld seam, eliminating the risk of seam-related failure in high-pressure, high-temperature or corrosive service. Jialu Metal stocks seamless pipe across pressure, boiler, structural, line-pipe and oilfield families on one list, so a project requiring A106 headers, A335 P22 superheater tubes, API 5L X60 line pipe and API 5CT casing does not need to be split a
- No weld seam or heat-affected zone means no preferred failure path along the pipe length
- Pressure, boiler, low-temperature, line-pipe and oilfield grades available on one stock list and one contract
- ASTM, API, DIN and EN designations supplied against a single enquiry, enabling mixed-standard projects on one order
- Round, square and rectangle sections available, keeping structural and process scope with one supplier
Mill certificates issued against the ordered grade and standard. Third-party inspection available on request.
What This Material Is For
Seamless steel pipe is formed from a solid billet without a weld seam, eliminating the risk of seam-related failure in high-pressure, high-temperature or corrosive service. Jialu Metal stocks seamless pipe across pressure, boiler, structural, line-pipe and oilfield families on one list, so a project requiring A106 headers, A335 P22 superheater tubes, API 5L X60 line pipe and API 5CT casing does not need to be split across multiple mills, inspection dates or shipments. Round, square and rectangular sections are available from the same order.
Why Buyers Choose It
- No weld seam or heat-affected zone means no preferred failure path along the pipe length
- Pressure, boiler, low-temperature, line-pipe and oilfield grades available on one stock list and one contract
- ASTM, API, DIN and EN designations supplied against a single enquiry, enabling mixed-standard projects on one order
- Round, square and rectangle sections available, keeping structural and process scope with one supplier
- Third-party inspection can be arranged before shipment, reducing post-arrival delays
Where It Is Used
- Refinery and petrochemical process piping using A106 Grade B and A335 P11 or P22
- Boiler and superheater circuits with A179, A192, A210 A1/C and A213 T5 through T22 tubes
- Onshore transmission line pipe in API 5L PSL1 and PSL2, grades B through X70
- Oil country tubular strings in API 5CT J55, N80, L80, P110 and M65
- Cryogenic and low-temperature service piping in A333 Grade 6
- Machined hydraulic cylinders and structural members from A519 4130 and 4140
Who It Is For
- EPC contractors sourcing mixed-standard pipe scope for a single plant or pipeline package
- Boiler and pressure vessel fabricators needing tube grades matched to a code stamp
- Oilfield distributors stocking casing and tubing against API 5CT
- Machine shops sourcing 4130 and 4140 tube for cylinders and rolled components
Problems It Solves
- Splitting one pipe scope across multiple mills, which multiplies inspection visits and shipment dates
- Weld-seam objections from third-party inspectors on high-pressure and sour-service lines
- Mixed ASTM, API, DIN and EN callouts on one drawing set that no single domestic stockist covers
- Late grade substitution when one mill cannot roll a size within the project window
Technical Features
- Hot-pierced and cold-drawn production routes, selected by wall thickness and surface requirement
- Grade coverage spans carbon, alloy, stainless and duplex families including A312 TP304, TP304L, TP316, TP316L and A789
- Chromium-molybdenum grades A213 T5 through T22 and TP347H available for elevated-temperature service
- DIN 17175 and EN 10216-2 boiler grades ST35, ST45, ST52 and 13CrMo44 supplied to European callouts
- Precision tube to DIN 2391 and EN 10305-1 in St35, St45 and St52 for hydraulic applications
Grades Standards And Size Range
Values below come from the published product data. Anything not listed is confirmed per enquiry.
| ASTM pressure and boiler grades | A53 A/B, A106 A/B, A179, A192, A210 A1/C |
|---|---|
| ASTM alloy tube grades | A213 T5, T11, T12, T22, TP347H |
| Stainless and duplex grades | A312 TP304, TP304L, TP316, TP316L, A789 |
| Low temperature grade | A333 Gr.6 |
| Chrome-moly pipe grades | A335 P9, P11, P22 |
| Alloy structural grades | A519 4130, 4140 |
| API 5CT grades | J55, K55, N80, L80, C90, C95, T95, P110, M65 |
| API 5L grades | PSL1 and PSL2 in A, B, X42, X46, X52, X56, X60, X65, X70 |
| DIN / EN boiler grades | DIN 17175 / EN 10216-2: ST35, ST45, ST52, 13CrMo44 |
| DIN / EN precision tube | DIN 2391 / EN 10305-1: St35, St45, St52 |
| DIN / EN structural tube | DIN 1629 / EN 10216-1: St37, St45, St52 |
| Sections | Round, square and rectangle |
| Outside diameter and wall range | TBC |
Materials
- Carbon steel for general pressure and structural duty in the A53 and A106 families
- Chromium-molybdenum alloy steel for creep resistance above ambient service temperature
- Austenitic stainless steel TP304, TP304L, TP316 and TP316L where corrosion drives the choice
- Duplex stainless to A789 where chloride environments defeat austenitic grades
- Alloy structural steel 4130 and 4140 where the tube will be machined or heat treated
Manufacturing Route
Quality Control
- Chemical composition and mechanical property checks against the ordered specification
- In-house laboratory holding CNAS certification carries out the routine testing
- Third-party inspection can be booked before shipment on buyer request
- Mill certificates issued against the grade and standard stated on the purchase order
Customisation Options
- Grade and standard selected per line item, so one order can mix ASTM, API, DIN and EN callouts
- Cut lengths and section shape specified at order stage
- OEM service accepted
- Packing and marking arranged to suit the destination port and inspection regime
How It Compares With The Alternatives
| ERW welded pipe | Seamless costs more per tonne; ERW is the sensible choice for low-pressure water, structural and conveyance duty where no seam objection applies |
|---|---|
| Spiral SSAW pipe | Spiral wins on large diameters and price; seamless wins on smaller diameters and wherever the code rules out a helical seam |
| Stainless seamless pipe | Carbon seamless is far cheaper but needs coating or lining in corrosive service, where TP316L pays for itself over the asset life |
Buying Guide
- Start from the code the project is stamped to, then pick the grade family before the size
- For elevated temperature service confirm whether the creep allowance drives you to P11, P22 or a T-grade tube
- For sour or chloride service state the environment in the enquiry so duplex or TP316L can be quoted alongside carbon
- Send the size table with the enquiry, because grade availability varies by outside diameter and wall thickness
- Book third-party inspection at order stage rather than after production, so the schedule absorbs it
Questions About Seamless Steel Pipe
Which seamless standards can you supply against?
ASTM A53, A106, A179, A192, A210, A213, A312, A333, A335, A519 and A789, API 5L and API 5CT, plus DIN 17175, DIN 2391, DIN 1629 and their EN 10216 and EN 10305 equivalents.
Can one order mix grades and standards?
Yes. Mixed-standard scope on one purchase order is the normal case here, which is why buyers consolidate pipe, plate and coil with us rather than splitting across mills.
Do you supply square and rectangular sections?
Yes. Round, square and rectangle sections are all available.
What certification backs the material?
The company holds ISO 9001, API Q1, PED, CE and API 5L, 5CT and 5DP, with an in-house CNAS-certified laboratory. Mill certificates are issued against the ordered specification.
Can we appoint our own inspector?
Yes. Third-party inspection is available on request and is best booked at order stage so the production schedule allows for it.
What payment terms and currencies do you accept?
L/C, T/T, PayPal and credit card, in USD, CAD, AUD, SGD, EUR or RMB.
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