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Review seamless, ERW, LSAW, welded pipe, and fittings for lines, mechanical service, and structural packages. Confirm standard (ASTM/API/EN), grade, OD, wall thickness, end finish, length, NDT, and packing before quotation. Tsingshan Steel aligns MTC, heat marks, and third-party inspection scope with the export route.
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Common grades
Common standards
Recommended for RFQ
Core products with complete specs — start here for quotation.
Buying notes
Confirm these points before inquiry so the quotation can be practical and specific.
- State seamless vs welded/ERW and the governing standard.
- Provide OD, WT, length, and end type (PE/BE/threaded if any).
- List required tests: hydro, eddy current, UT, or project NDT.
- Confirm quantity, delivery schedule, and destination port.
- Request MTC 3.1 and marking rules matching the PO.
Showing 15 of 15 products
Grades, standards, applications
Grades, standards, applications
Common grades
State seamless vs ERW/LSAW, PSL level for line pipe, and OD × wall before quotation.
- Pipe Carbon Steel
- Structural Carbon Steel
- Alloy Steel
- 200 Series Stainless
- 300 Series Stainless
Common standards
- DIN 1629
- EN 10210
- EN 10204
- ASTM A500
- EN 10219
- PROJECT STRUCTURAL PRACTICE
- API 5L
- ASTM A519
- SAE 4130 PRACTICE AS CONTRACTED
- AISI 4130
- ASTM A214
- ASTM A53
Typical applications
- Process and utility piping
- Oil and gas line pipe packages
- Structural and mechanical tubing
- Boiler and heat-service tubes where specified
- Export EPC bulk pipe lists
Size & dimension range
- State OD × wall thickness and length (SRL/DRL/fixed).
- Process: seamless, ERW, or LSAW as required.
- Confirm end finish and surface (black, painted, galvanized).
- For line pipe: PSL/grade plus export bundle packing.
Category FAQ
Category FAQ
When should I choose seamless over ERW?
Choose seamless when pressure, temperature, or the project specification requires it. ERW can be practical for structural and lower-duty lines when the standard and tests are met.
What belongs in a pipe RFQ?
Form, standard, grade, OD, WT, length, ends, quantity, tests, coating if any, packing, and port.
Can fittings ship with pipe in one lot?
Yes when line items and marks stay separate. List fittings by type, size, and standard to keep MTC mapping clean.
Do you support API line pipe grades?
API references can be reviewed against available supply routes. Send the exact grade, PSL, OD, WT, and test scope for a practical check.
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