China's tungsten curbs squeeze drill bits for AI chip substrates
TL;DR
- China limited tungsten exports to 15 licensed firms in 2026-2027, giving Beijing direct leverage over both drill-bit carbide and WF6 etch-gas supply in a single policy move.
- WF6 prices surged from 950,000 yuan per tonne in early 2026 to 2.5 million yuan per tonne by June, a roughly 160% increase in under six months.
- Advanced AI chip nodes require up to 140 tungsten-dependent etch steps versus 20 for 65nm processes, meaning each node transition amplifies the exposure.
China's tungsten exports to Japan fell to zero from February through April 2026, according to Nikkei Asia. The casualty is a part most readers have never heard of: tungsten carbide micro drill bits, the needle-fine tools that bore holes in printed circuit boards and the substrates underneath AI chips.
The Nikkei writes that "China's export controls on critical metals have disrupted supplies of micro drill bits, little-known but critical components in the AI chip supply chain, in the latest example of how geopolitical tensions are rippling through the global tech industry." Taiwan's Topoint is one of the main manufacturers of the bits. China controls roughly 80% of global tungsten supply.
The price response has been severe. Mitsubishi Materials revised cemented carbide quotes to more than triple previous levels for orders received from June onward. Sumitomo Electric has raised tool-product prices by up to 60% and is hunting U.S. sourcing to cover the roughly 30% of its historical raw tungsten supply that came from China.
"Procurement from China has completely stopped," Sumitomo Electric President Osamu Inoue said.
The workaround runs through Vietnam. Mitsubishi Materials is tapping Vietnamese tungsten as a China alternative, while Sumitomo is developing low-tungsten tools to lower the dependence altogether.
What others are reporting
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DigitalToday Read →
Quantifies WF6 price escalation and ties it directly to HBM output risk; documents CSIC capacity expansion and the 7nm etch-step multiplier effect.
The supply disruption shows that the bottleneck in the AI semiconductor race is shifting from production facilities to materials.
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Discovery Alert Read →
Maps the full transmission pathway from Chinese policy through Japanese WF6 producers to Samsung and DB HiTek; documents Japan's 50% April import collapse and named production suspension notices.
Tungsten powder, the raw mineral input refined into the gas, accounts for more than 60% of WF6 production costs.
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Crypto Briefing Read →
Documents two major Japanese producer shutdowns as concrete supply-failure evidence and projects the structural deficit extending through 2028.
China controls roughly 80% of the world's tungsten supply. Starting in 2025, China imposed export restrictions that limited the number of firms permitted to ship tungsten abroad.
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Main St Press Read →
Frames the crisis as a deliberate policy choice over demand-driven scarcity; documents an Ontario tungsten carbide facility shutdown as a concrete Western industrial casualty.
The squeeze also hit artificial intelligence chip supply chains that rely on tungsten materials and compounds at several steps.
Originally reported by asia.nikkei.com
Read the original article →Original headline: China's export curbs on tungsten squeeze micro drill bits used to make AI chip substrates