China took more than 80% of seaborne Iranian oil last year, according to analytics firm Kpler — a dependence Washington moved to exploit on Friday when the US Treasury blacklisted Hengli Petrochemical (Dalian) Refinery and roughly 40 shipping firms. The Treasury said the designations aim to cut off 'hundreds of millions of dollars' Tehran receives from crude sales; China’s embassy in Washington protested, and the steps add pressure on small private 'teapot' refiners already squeezed by high feedstock costs and thin margins.

What the US announced

The Treasury named Hengli Petrochemical (Dalian) Refinery as a sanctions target and said roughly 40 shipping companies and vessels tied to Iran’s so-called shadow fleet were also being designated. The Treasury said the refinery is one of Tehran’s most valued customers and that its purchases helped generate "hundreds of millions of dollars" for Iran’s military, according to Treasury statements.

US sanctions typically freeze any assets in the United States and bar Americans from dealing with designated entities. Officials said they will press on with measures aimed at the network of intermediaries and buyers that move Iranian crude into international markets.

Why teapot refineries matter

  • Teapot refiners are small, privately owned plants that boost China’s fuel supply by buying discounted Iranian and Russian crude; they are nicknamed for their squat, kettle-like shapes and cluster in Shandong province.
  • The model lets state-owned majors avoid politically risky trades while independents absorb price and logistics risks.
  • Teapots account for about a quarter of China’s refinery capacity, run on narrow or sometimes negative margins, and have faced weak domestic demand, according to Treasury and industry reports.
  • Beijing recently granted independent refiners import quotas totalling about 55 million tonnes of crude and has asked the sector to keep output near two-year average run rates to ensure domestic fuel supplies.
  • Traders and industry data cited in coverage put average losses for teapots at nearly $21 per barrel in late March, reflecting pressure from expensive feedstock.

How the measures intersect with wider pressure on Iran

The sanctions come amid heightened tension in the Gulf and are part of a broader US push to constrict Iran’s oil trade. Analysts and industry data show China takes the bulk of Iran’s seaborne exports; analytics firm Kpler reported that in the previous year China purchased more than 80% of shipped Iranian oil. That dependence helps explain why Washington has focused on buyers and the vessels that carry Iran’s crude.

The Treasury previously sanctioned several teapots in 2025 — including Hebei Xinhai Chemical Group, Shandong Shouguang Luqing Petrochemical and Shandong Shengxing Chemical — measures that created hurdles for some independents trying to secure crude and sell products under different names.

Market effects and refinery behaviour

  • Oil markets have been volatile since the outbreak of conflict in the Middle East: prices briefly spiked when strikes threatened shipping and production, then eased after a two-week ceasefire announcement and assurances over tanker movements through the Strait of Hormuz.
  • Brent and WTI both fell below $100 per barrel in the days after the truce was reported, changing the calculus for teapot buyers.

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The Treasury said it will continue to target the network of vessels, intermediaries and buyers Iran relies on to move its oil to global markets.

This article was created with AI assistance.