HS Code 730531
6-digit classification for Longitudinally Welded, with duty lookup and 1688 checks before payment
Official description: Other tubes and pipes (for example, welded, riveted or similarly closed), having circular crosssections, the external diameter of which exceeds 406,4 mm, of iron or steel : Other, welded : Longitudinally welded
Also searched as: large diameter longitudinal welded pipe, large OD welded pipe, LSAW large pipe
Classification
How 730531 breaks down
Articles of iron or steel
Other tubes and pipes (for example, welded, riveted or similarly closed), having circular crosssections, the external diameter of which exceeds 406,4 mm, of iron or steel
Longitudinally welded
Short answer
What HS code 730531 means before paying a 1688 supplier
HS code 730531 is the 6-digit HS 2022 starting point for longitudinally welded; often searched as large diameter longitudinal welded pipe, large OD welded pipe, LSAW large pipe. Before using it in a landed-cost estimate, confirm the product material, function, destination market, and the official tariff source. Treat any 1688 supplier code as a clue, not the final import classification.
Use
Start with this 6-digit HS code and compare the product's material, function, and use.
Verify
Check the destination market's official HTS, TARIC, commodity-code, duty, VAT, or GST source.
Decide
If classification, documents, or restricted-product risk is unclear, submit the product for a written check.
Covered products
What products fall under HS code 730531?
Buyers sourcing longitudinally welded from 1688 commonly describe it in these ways. If your product matches, 730531 is likely the right 6-digit starting point — confirm material and intended use against the official tariff.
US import duty · China origin
US import duty for HS 730531
Published USITC HTS rates for longitudinally welded (730531), aggregated at the 6-digit level. A research estimate — the final rate depends on your full 8-10 digit HTS line.
Base MFN rate
0%
Average across 3 US national tariff lines under 730531.
Section 301 (China)
+25%
Covered lines under this code carry a Section 301 China surcharge.
Effective China-origin
≈25%
Base rate with applicable 301 surcharges — before MPF/HMF and any trade-action changes.
Source: USITC HTS (base MFN) + Section 301 overlay · data as of 2026-07-05 · rates change with trade actions — always confirm your full 10-digit line on hts.usitc.gov before pricing a product. Other markets (EU/UK/CA/AU/SG) below.
Import duty by market
Where to check the import duty for HS 730531
The 6-digit code is universal, but duty, VAT and GST are set by the destination country and depend on the full national tariff line with China as the country of origin. Start from the official source for your market.
United States
USITC / CBP · Harmonized Tariff Schedule (HTS)
European Union
TARIC · Access2Markets
United Kingdom
HMRC · UK Integrated Online Tariff
Canada
CBSA · Canadian Customs Tariff
Australia
ABF · Australian customs tariff
Singapore
Singapore Customs · Singapore Trade Classification (HS)
Compare China-origin duty evidence across supported markets
Use the HS & import duty checker to estimate duty + VAT/GST for 730531 by destination before you pay a 1688 supplier.
Heading 7305
Other HS codes under 7305
Subheadings in the same 4-digit heading — "Other tubes and pipes (for example, welded, riveted or similarly closed), having circular crosssections, the external diameter of which exceeds 406,4 mm, of iron or steel". If 730531 is not an exact match, one of these may classify your product more precisely.
Questions
HS code 730531: common questions
What is the US import duty for HS code 730531 from China?
As published in the USITC HTS (data as of 2026-07-05), the base MFN rate for 730531 averages about 0%, and Section 301 China surcharges apply on covered lines (up to +25%), bringing the effective China-origin rate to roughly 25% (averaged across 3 national tariff lines). This is a research estimate — the final rate depends on your full 8-10 digit HTS line; verify on hts.usitc.gov.
What is HS code 730531?
HS code 730531 is the World Customs Organization 6-digit HS 2022 subheading for "Other tubes and pipes (for example, welded, riveted or similarly closed), having circular crosssections, the external diameter of which exceeds 406,4 mm, of iron or steel : Other, welded : Longitudinally welded". The first two digits (73) are the chapter — Articles of iron or steel — and digits 3-4 (7305) are the heading. Countries add further digits (8-10) for their national tariff line.
What products fall under HS 730531?
Common products classified under 730531 include large diameter longitudinal welded pipe, large OD welded pipe, LSAW large pipe and similar items matching longitudinally welded. The correct code still depends on the product's material, function and intended use.
How do I find the import duty for HS code 730531?
Duty is set by the destination country, not by the 6-digit HS code alone. Start from the official tariff of your market — USITC HTS (US), TARIC / Access2Markets (EU), GOV.UK Trade Tariff (UK), CBSA (Canada), ABF (Australia) or Singapore Customs — and look up the full national code with China as the country of origin.
Is HS code 730531 the same in every country?
The first 6 digits (730531) are the same worldwide under the WCO Harmonized System. Beyond that, each country extends the code (HTS in the US, TARIC in the EU, etc.) and sets its own duty and tax rates.
Can I trust the HS code a 1688 supplier gives me?
Treat a supplier-provided code as a clue, not a final classification. It can be incomplete, China-export-specific, or mismatched to your destination's rules. Verify against the official tariff and your product's actual material and use.
Is HSN code 730531 the same as HS code 730531?
Yes at the 6-digit level. India's HSN (Harmonized System of Nomenclature) uses the same WCO base, so HSN 730531 covers the same "longitudinally welded" scope; India then extends it to 8 digits for GST and customs. Check the Indian Customs tariff (CBIC) for the full national line.
Chapter 73
Explore Articles of iron or steel
Sourcing longitudinally welded from 1688?
Get a written pre-payment check — classification clues, China-origin landed cost, and supplier risk — before you commit. 5,754 HS codes covered.