US Sanctions on Hengli Refinery Tighten Pressure on Iranian Crude Flows to China

Hengli Petrochemical

US sanctions on Hengli refinery mark a renewed escalation in Washington’s effort to restrict Iranian crude flows into China. The US Treasury Department sanctioned Chinese independent refiner Hengli Petrochemical, accusing it of importing Iranian crude in violation of US sanctions.

US sanctions on Hengli refinery affect one of China’s largest independent refiners, with capacity of around 400,000 b/d. Hengli has relied heavily on Iranian and Russian crude, while also holding a term supply contract with Saudi Aramco.

US sanctions on Hengli refinery could therefore reshape its crude slate more directly than earlier measures. The sanctions may block future access to Saudi crude, limiting Hengli’s flexibility at a time when Iranian forward cargo availability is already tightening.

The action also comes as the US continues its naval blockade of Iranian trade and the Strait of Hormuz remains largely closed to navigation. This raises the pressure on crude logistics, shadow fleet operations and Chinese refinery procurement.

Hengli Sanctions Target China’s Independent Refining System

The Office of Foreign Assets Control issued a wind-down license allowing Hengli’s counterparties to end business with the refinery by 24 May. This gives suppliers, banks, traders and shipping partners a short window to reduce exposure.

The practical impact could be wider than the direct US designation. Sanctions can affect financing, insurance, shipping, letters of credit, crude supply contracts and trading relationships.

Hengli is particularly exposed because it sits between sanctioned crude flows and more conventional supply channels. The company has relied mostly on Iranian and Russian crude, but it also has access to Saudi term supply.

Losing access to Saudi crude would reduce feedstock optionality. It would also make Hengli more dependent on discounted, politically risky barrels or alternative spot procurement.

The sanctions follow earlier US actions against Chinese independent refiners, ports and terminals in 2025. Those measures failed to stop Iranian crude exports to China, but they increased compliance risk across the trade.

Washington paused new sanctions after October as US-China diplomatic talks resumed. The latest action signals that energy sanctions are again moving ahead despite planned high-level talks between the US and China.

The timing is sensitive. President Donald Trump is scheduled to visit Beijing next month after delaying an earlier trip because of the US-Israel war against Iran.

Shadow Fleet Logistics Face Renewed Pressure

Iranian crude still reaches China through a complex network of intermediaries, shadow fleet tankers and ship-to-ship transfers near Malaysia and Indonesia. These routes obscure origin and help cargoes reach independent refiners.

The US blockade has already reduced offers of Iranian forward cargoes to Chinese buyers. This is important because Chinese refiners depend on predictable discounted flows to maintain margins.

China’s imports from Malaysia and Indonesia reached a record 2.54mn b/d last month. These origins are often used as reported loading points for Iranian crude delivered through transhipment networks.

Floating storage trends also suggest logistics stress. Iranian crude floating storage off China has risen to nearly 20mn bl, while floating storage off Malaysia has fallen sharply from early-year levels.

This may limit future arrivals if fewer cargoes are available for onward delivery. It also suggests that some barrels are waiting near China because discharge, documentation or refinery acceptance has become more complicated.

OFAC also sanctioned 19 shadow fleet vessels accused of moving Iranian crude, LPG and petroleum products to the UAE, Bangladesh and China. This was the second vessel-focused sanctions wave under Operation Economic Fury.

The vessel sanctions matter because shadow fleet capacity is now a strategic part of sanctioned oil trade. If Washington continues to target tankers, freight availability, insurance risk and ship-to-ship transfer costs could rise.

For Chinese refiners, the sanctions increase procurement uncertainty. Iranian crude may remain available, but the cost of handling it could increase through higher freight, longer waiting times and greater compliance risk.

For the broader oil market, the impact depends on whether sanctions reduce actual flows or simply push them through more opaque channels. The US tried similar measures before, but Chinese demand for discounted crude has proven resilient.

Still, the current environment is more fragile. The Strait of Hormuz disruption, higher geopolitical risk and tighter enforcement against tankers make the logistics chain more vulnerable than usual.

The Metalnomist Commentary

The US is targeting the weakest link in Iranian crude flows to China: not demand, but logistics, financing and refinery access. Hengli’s case shows that sanctions are moving from broad pressure toward specific chokepoints in crude procurement and shadow fleet infrastructure.