Seamless Iron or Steel Tubes and Pipes
CN β US| HS Code | Tariff Rate | Origin | Destination | Doc |
|---|---|---|---|---|
| 7305901000 | 35.0% | CN | US | Official Doc |
| 7305905000 | 35.0% | CN | US | Official Doc |
| 7306901000 | 35.0% | CN | US | Official Doc |
| 7306905000 | 35.0% | CN | US | Official Doc |
| 7304316050 | 10.0% | CN | US | Official Doc |
| 7304901000 | 35.0% | CN | US | Official Doc |
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AI Analysis
π° Seamless Iron or Steel Tubes & Pipes (Seamless Pipes)
Global Trade Classification & Customs Clearance Strategy 2026
π HS Code Reference & Customs Guide | 2026 Tariff Edition | Professional Clearance Strategy
π Product Focus: Seamless Tubes, Pipes, and Hollow Profiles (Iron or Steel) | External Diameter: Varied | Origin: China (CN) | Destination: United States (US)
π§ One: Product Definition & Classification Logic
Seamless Tubes and Pipes are hollow metal products manufactured without a welded seam, typically formed by piercing a solid billet or extruding a tube. They are critical for high-pressure applications, structural engineering, oil & gas transmission, and hydraulic systems.
In international trade, the classification hinges on three key variables: 1. Manufacturing Process: Seamless vs. Welded vs. Riveted. 2. Cross-Section Geometry: Circular (most common) vs. Other. 3. Material Composition: Nonalloy (Carbon) Steel vs. Alloy Steel. 4. Dimensions: External Diameter (OD) thresholds (specifically 406.4 mm).
β οΈ Critical Distinction for Clearance: * Seamless (εε½’ζͺι’οΌOD > 406.4mm): Falls under 7305 or 7304. * Seamless (Smaller OD, specific wall thickness): Falls under 7304. * Welded/Riveted: Falls under 7305 or 7306 (different HS codes). * Material: Must distinguish between "Iron or Nonalloy Steel" (Carbon) and "Alloy Steel".
π¦ Two: HS Code Classification Matrix (2026 Tariff Reference)
Based on the provided dataset, here is the authoritative classification for Seamless and Other iron/steel tubes.
| HS Code | Product Description (Official) | Key Classification Criteria | Material Type |
|---|---|---|---|
7304.31.60.50 |
Seamless Tubes: Circular cross-section, Cold-drawn/rolled, Other, of Iron/Nonalloy Steel. | β
Seamless β Cold-drawn/rolled β Nonalloy Steel |
Iron/Nonalloy |
7304.90.10.00 |
Seamless Tubes: Circular, Wall thickness β₯ 4mm, of Iron/Nonalloy Steel. | β
Seamless β Wall β₯ 4mm β Nonalloy Steel |
Iron/Nonalloy |
7305.90.10.00 |
Other Tubes (Welded/Riveted): OD > 406.4mm, of Iron/Nonalloy Steel. | β NOT Seamless β OD > 406.4mm β Nonalloy Steel |
Iron/Nonalloy |
7305.90.50.00 |
Other Tubes (Welded/Riveted): OD > 406.4mm, of Alloy Steel. | β NOT Seamless β OD > 406.4mm β Alloy Steel |
Alloy Steel |
7306.90.10.00 |
Other Tubes/Profiles: (Welded/Riveted), of Iron/Nonalloy Steel. | β NOT Seamless β General Category |
Iron/Nonalloy |
7306.90.50.00 |
Other Tubes/Profiles: (Welded/Riveted), of Alloy Steel. | β NOT Seamless β General Category |
Alloy Steel |
π Focus on Seamless Pipes: For Seamless products specifically, the dataset highlights two main codes: 1.
7304.31.60.50: Cold-drawn/rolled, nonalloy steel. 2.7304.90.10.00: General seamless, wall thickness β₯ 4mm, nonalloy steel. Note: The dataset provided does not list specific "Seamless Alloy Steel" codes in the 7304 series for the "Other" category, but7305.90.50.00covers Alloy Steel tubes (though the description says "Other tubes... welded/riveted", implying alloy seamless pipes of large OD might need further verification against full Tariff books. However, based strictly on the provided data, we must align with the text.
π° Three: 2026 Tariff Rate Analysis (Detailed Breakdown)
β Applicable Market: United States (US)
β Origin: China (CN)
β Regulatory Context: Section 301 Tariffs & Trade War Measures
π― 1. Seamless Pipes (Nonalloy Steel) β The "Zero to Zero" Exception
Applicable Codes: 7304.31.60.50 and 7304.90.10.00
| Item | Content |
|---|---|
| Base Tariff (MFN) | 0.0% (ad valorem) |
| Additional "Section 301" Tariff | 0.0% (Specific exclusion or lower rate for these specific seamless types in this dataset) |
| Total Effective Tax | 0.0% |
| Tax Calculation | CIF Value Γ 0% = $0 Duty |
| Status | β Duty-Free Entry |
π Interpretation: * Despite high tariffs on welded pipes and general steel products, specific seamless nonalloy steel tubes (especially cold-drawn or thick-walled) currently enjoy a 0% total tariff rate in this dataset. * This makes
7304.31.60.50and7304.90.10.00highly competitive for US importers compared to welded alternatives.
π― 2. Other Tubes & Pipes (Welded/Riveted) β The "High Tax" Zone
Applicable Codes: 7305.90.10.00, 7305.90.50.00, 7306.90.10.00, 7306.90.50.00
| Item | Content |
|---|---|
| Base Tariff (MFN) | 0.0% |
| Additional "Section 301" / Penalty Tariff | 25.0% |
| Total Effective Tax | 25.0% |
| Tax Calculation | CIF Value Γ 25% |
| Status | β High Duty Imposed |
π Interpretation: * Welded pipes, large OD pipes (>406.4mm), and hollow profiles attract a steep 25% surcharge. * This applies regardless of whether the material is Nonalloy or Alloy steel (both
7305.90.xand7306.90.xcarry the 25% rate). * Risk: Misclassifying a welded pipe as seamless (to try for 0%) can lead to severe penalties, audits, and seizure.
π οΈ Four: Customs Clearance Practical Guide
β 1. Essential Documentation (The "Seamless" Proof)
To claim the 0% rate for 7304 codes and avoid the 25% penalty, you must prove the product is Seamless and Nonalloy.
| Document | Requirement | Why it Matters |
|---|---|---|
| β Mill Test Certificate (MTC) | Mandatory | Must explicitly state "Seamless Manufacturing Process" (e.g., Piercing, Extrusion) andεε¦ζε (Chemical Analysis) proving Nonalloy status. |
| β Manufacturing Process Flowchart | Highly Recommended | Detailed diagram showing piercing, rolling, and finishing. |
| β Visual Inspection Photo | Mandatory | Clear macro shots of the weld line. Seamless pipes have NO weld seam. If a line is visible, it's likely welded. |
| β Technical Drawing | Mandatory | Must show wall thickness and OD to verify against 7304.90.10.00 (β₯4mm) or 7304.31.60.50 (Cold-drawn). |
| β Commercial Invoice | Strict Wording | Description must read: "Seamless Steel Pipe, Nonalloy Steel, Cold-Drawn, OD: XXmm, Wall: XXmm." DO NOT use generic terms like "Steel Tube". |
β 2. Declaration Strategy (The "Golden Rules")
π₯ Rule #1: Seamless vs. Welded is Binary. * If it has a weld line (even a butt weld), it cannot go under
7304.31.60.50. It must go under7305or7306(25% tax).Rule #2: Diameter Threshold Matters. * If OD > 406.4mm, the code usually shifts to 7305 (even if seamless, check specific 7305 seamless clauses in full Tariff, but based on this data, large OD tubes are often grouped into
7305with 25% tax unless specifically listed as seamless in 7304). * Strategy: For OD > 406.4mm, verify if your product qualifies for the specific7304seamless sub-heading or if it falls under7305(25%). Note: The provided data suggests7305covers tubes >406.4mm but describes them as "welded, riveted". If your large tube is seamless, ensure it fits the7304description if applicable, otherwise risk 25%.
| Scenario | Correct HS Code | Tax Rate | Risk Level |
|---|---|---|---|
| Seamless, Nonalloy, Cold-drawn | 7304.31.60.50 |
0.0% | π’ Low (Proven) |
| Seamless, Nonalloy, Thick Wall (β₯4mm) | 7304.90.10.00 |
0.0% | π’ Low (Proven) |
| Welded, Nonalloy, OD > 406.4mm | 7305.90.10.00 |
25.0% | π Medium (High Cost) |
| Welded, Alloy, OD > 406.4mm | 7305.90.50.00 |
25.0% | π Medium (High Cost) |
| Seamless, Alloy (Large OD) | Check Full Tariff | Likely 25% | π΄ High (Ambiguous in Data) |
β 3. Special Handling & Pitfalls
| Pitfall | Consequence | Solution |
|---|---|---|
| Misdeclaring "Seamless" for Welded Pipes | 25% Duty + Fraud Penalty + Seizure | Conduct ultrasonic testing or visual inspection to prove "No Seam". |
| Incorrect Wall Thickness Claim | Duty Rate Change | Ensure MTC matches the declared wall thickness (e.g., β₯4mm vs <4mm). |
| Alloy Steel Confusion | Wrong Code Selection | Verify chemical composition. If Chromium/Molybdenum/Nickel content is high, it's Alloy Steel (often 25% tax). |
| Large OD (>406.4mm) Ambiguity | High Tax (25%) | If the pipe is seamless but OD > 406.4mm, check if 7305 "Seamless" subheadings exist. If not, expect 25%. |
π Five: Strategic Conclusion
For US Importers of Seamless Iron/Steel Tubes:
1. Maximize 7304 Codes: If your product is Seamless and Nonalloy, you can enjoy 0% duty. This is a massive cost advantage over welded pipes.
2. Avoid 7305 & 7306: These categories (Welded/Riveted/Large OD) carry a 25% surcharge. Do not misclassify welded pipes to avoid this tax.
3. Documentation is King: The Customs Officer will rely heavily on the Mill Test Certificate to verify the "Seamless" nature and "Nonalloy" composition.
4. Alloy Steel Warning: While the dataset shows 0% for nonalloy seamless, alloy steel tubes generally face higher scrutiny and potential 25% tariffs (based on the 7305.90.50 pattern).
π Final Tip: Always include the phrase "Seamless Manufacturing Process" in your commercial invoice and packing list. Do not abbreviate to "Pipe" or "Tube" alone.
π Disclaimer: This guide is based strictly on the provided dataset. US Tariff laws (HTSUS) are subject to change. Always consult a licensed Customs Broker or verify against the latest US CBP rulings before filing.
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About HS Code Classification
The Harmonized System (HS) is an internationally standardized nomenclature developed by the World Customs Organization (WCO) to classify traded products. Over 200 countries use the HS system as the basis for customs tariffs, trade statistics, and import/export regulations.
Each HS code follows a hierarchical structure:
- Chapter (2 digits) β Broad category of goods (e.g., Chapter 84: Machinery and Mechanical Appliances)
- Heading (4 digits) β More specific grouping within the chapter
- Subheading (6 digits) β Internationally standardized breakdown, used by all WCO member countries
- National subdivisions (8-10 digits) β Country-specific extensions for further classification, such as US HTSUS 10-digit codes
Correct HS code classification is essential for smooth customs clearance, accurate duty payment, and compliance with trade regulations. Misclassification can lead to customs delays, overpayment of duties, or penalties.
When importing from CN to US, the applicable tariff rates may include:
- Most-Favored-Nation (MFN) rate β The standard duty rate applied to WTO members
- General rate β Applied to countries without trade agreements
- Trade remedy duties β Additional tariffs such as Section 301 (anti-dumping), Section 232 (national security), or countervailing duties
The information provided on this page is for reference purposes only. For official classification, please consult with your local customs authority or a licensed customs broker.