Marine & offshore · Factory certificates
Lloyd’s Register Works Approval for Seamless Stainless Steel Pipes and Tubes
Lloyd’s Register (LR) Works Approval LR25338152WA approves Zhejiang Xintongda’s Songyang works for cold-drawn seamless pipes and tubes in austenitic and duplex stainless steels. The scope covers solution heat-treated material up to 323.9 mm outside diameter and 12.70 mm wall thickness. Read the scope below, then download the two-page certificate.
Download LR Certificate LR25338152WA
Approved Materials, Manufacturing Process and Size Limits
Page 2 carries the approval particulars. The additional remarks then state the process, the material categories and the ceiling in one sentence:
“Approval for cold drawn seamless pipes and tubes in austenitic stainless steel and duplex stainless steel (Maximum diameter 323.9mm, maximum wall thickness 12.7mm) in solution heat treatment condition.”
| Material category | Product form | Delivery condition | Maximum OD | Maximum wall |
|---|---|---|---|---|
| Austenitic stainless steel | Seamless pipe and tube, cold drawn | Solution heat treated | 323.9 mm | 12.70 mm |
| Duplex stainless steel | Seamless pipe and tube, cold drawn | Solution heat treated | 323.9 mm | 12.70 mm |
Both categories carry the same wall limit and the same delivery condition, and the diameter ceiling applies to the approval as a whole rather than to one category.
The approval covers pipe and tube, which matters where a project needs both — heat-exchanger tube to ASTM A213 or A789 alongside pipe to A312 or A790, for example. One works approval then covers both product forms, subject to the same category and size limits.
Manufacturer and Export Contact
Manufacturer · Zhejiang Xintongda Special Steel Manufacturing Co., Ltd. (浙江鑫通达特钢制造有限公司), No. 209 Ruiyang Avenue, Xiping Street, Songyang County, Lishui, Zhejiang 323400, China. The certificate names this company and this address, so the approval attaches to material produced there.
Export supplier · Wenzhou Xinzhe Tech Co., Ltd. (温州信哲科技有限公司) handles overseas enquiries, quotations, documentation and shipment coordination with the factory.
What LR Works Approval Means for Buyers
Lloyd’s Register is one of the classification societies that set and apply the rules for ships and offshore units, and a member of IACS. It assesses material manufacturers against its Rules for the Manufacture, Testing and Certification of Materials and the supporting procedures for each product type.
A Works Approval settles four points at once, and these are the four a buyer checks during supplier qualification: the named manufacturing site, the product form approved there, the material categories covered, and the size ceiling.
It does not certify individual shipments. The certificate is issued subject to compliance with those Rules, and provides that Lloyd’s Register may cancel or withdraw it if a change affects its validity. Inspection, test witnessing and certification for a specific order are therefore agreed against that order — ideally before production is scheduled.
Grade, Specification and Order Requirements
The Grades column on page 2 reads “austenitic stainless” and “duplex stainless”. No ASTM designation, UNS number or standard edition appears anywhere on the certificate. Page 1 points the same way: the details of “the processes and grades to which this approval applies are given on subsequent pages”, and those details stop at material category.
An enquiry for TP316L to ASTM A312 or 2205 to ASTM A790 is therefore confirmed on three points, not one: the works is approved for the material category, the grade and edition meet the named standard, and the OD × wall combination sits inside 323.9 × 12.70 mm. The certificate answers the first point only.
Before quoting. Check both dimensional limits, the manufacturing route (cold drawn seamless) and the delivery condition (solution heat treated). Welded pipe, welded tube and fittings fall outside the scope described in LR25338152WA and would need separate confirmation from Lloyd’s Register.
Download and Verify LR Certificate LR25338152WA
Download LR Certificate LR25338152WA
Certificate number, dates and limits on this page are those printed on the supplied certificate, which carries form reference LM01 2.0: issued 31 October 2025, expiring 30 October 2028. Check the current status in LR’s approval listings using the certificate number or the manufacturer’s full name before an order is placed.
Frequently Asked Questions
What size limits does LR25338152WA specify?
The certificate lists a maximum outside diameter of 323.9 mm and a maximum wall thickness of 12.70 mm for cold-drawn seamless austenitic and duplex stainless steel pipes and tubes in the solution heat-treated condition.
Does LR25338152WA list 316L or duplex 2205 by grade?
No. Page 2 lists austenitic stainless steel and duplex stainless steel by material category, without ASTM designations or UNS numbers. A grade-specific enquiry is confirmed against the order and the applicable Lloyd’s Register rules, using the exact grade, specification and dimensions.
Does the approval cover both pipe and tube?
Yes. The certificate type is Pipes and Tubes and the additional remarks refer to cold-drawn seamless pipes and tubes, so both product forms fall inside the approval, subject to the same material categories and the same 323.9 mm by 12.70 mm limits.
What documentation do I need for a shipment?
A Works Approval records the manufacturing site and its approved scope; it is not a certificate for a shipment. State your inspection, witnessing and certification requirements when requesting a quotation so the documentation route can be agreed before production.
How can I check that the certificate is still valid?
Look up certificate number LR25338152WA or the manufacturer’s full name in Lloyd’s Register’s approval listings. The certificate shows an issue date of 31 October 2025 and an expiry date of 30 October 2028, and provides that Lloyd’s Register must be notified of any change affecting its validity.
Who manufactures the pipe and who handles export orders?
Zhejiang Xintongda Special Steel Manufacturing Co., Ltd. manufactures the pipe and tube at No. 209 Ruiyang Avenue, Songyang County, Lishui, Zhejiang. Wenzhou Xinzhe Tech Co., Ltd. handles overseas enquiries, quotations and supply coordination.
Request an LR Scope Review
Send your project requirements to Wenzhou Xinzhe for a scope review and export quotation. We check the grade, standard and size against this approval and flag anything that needs confirming with Lloyd’s Register.
- Material specification and edition
- Material grade or UNS designation
- Outside diameter × wall thickness
- Quantity and delivery condition
- Intended service and class requirements
- Inspection, witnessing and certification documents required
Wenzhou Xinzhe coordinates the scope and documentation review with the Songyang factory.
Page reviewed 8 November 2026 against Lloyd’s Register certificate LR25338152WA, form LM01 2.0.
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