(Bloomberg) -- One pillar of this year’s blistering commodities rally -- Chinese demand -- may be teetering.Beijing aced its economic recovery from the pandemic largely via an expansion in credit and a state-aided construction boom that sucked in raw materials from across the planet. Already the world’s biggest consumer, China spent $150 billion on crude oil, iron ore and copper ore alone in the first four months of 2021. Resurgent demand and rising prices mean that’s $36 billion more than the same period last year.With global commodities rising to record highs, Chinese government officials are trying to temper prices and reduce some of the speculative froth that’s driven markets. Wary of inflating asset bubbles, the People’s Bank of China has also been restricting the flow of money to the economy since last year, albeit gradually to avoid derailing growth. At the same time, funding for infrastructure projects has shown signs of slowing.Economic data for April suggest that both China’s economic expansion and its credit impulse -- new credit as a percentage of GDP -- may already have crested, putting the rally on a precarious footing. The most obvious impact of China’s deleveraging would fall on those metals keyed to real estate and infrastructure spending, from copper and aluminum, to steel and its main ingredient, iron ore.“Credit is a major driver for commodity prices, and we reckon prices peak when credit peaks,” said Alison Li, co-head of base metals research at Mysteel in Shanghai. “That refers to global credit, but Chinese credit accounts for a big part of it, especially when it comes to infrastructure and property investment.”But the impact of China’s credit pullback could ripple far and wide, threatening the rally in global oil prices and even China’s crop markets. And while tighter money supply hasn’t stopped many metals hitting eye-popping levels in recent weeks, some, like copper, are already seeing consumers shying away from higher prices.“The slowdown in credit will have a negative impact on China’s demand for commodities,” said Hao Zhou, senior emerging markets economist at Commerzbank AG. “So far, property and infrastructure investments haven’t shown an obvious deceleration. But they are likely to trend lower in the second half of this year.”A lag between the withdrawal of credit and stimulus from the economy and its impact on China’s raw material purchases may mean that markets haven’t yet peaked. However, its companies may eventually soften imports due to tighter credit conditions, which means the direction of the global commodity market will hinge on how much the recovery in economies including the U.S. and Europe can continue to drive prices higher.Some sectors have seen policy push an expansion in capacity, such as Beijing’s move to grow the country’s crude oil refining and copper smelting industries. Purchases of the materials needed for production in those sectors may continue to see gains although at a slower pace.One example of slowing purchases is likely to be in refined copper, said Mysteel’s Li. The premium paid for the metal at the port of Yangshan has already hit a four-year low in a sign of waning demand, and imports are likely to fall this year, she said.At the same time, the rally in copper prices probably still has a few months to run, according to a recent note from Citigroup Inc., citing the lag between peak credit and peak demand. From around $10,000 a ton now, the bank expects copper to reach $12,200 by September.It’s a dynamic that’s also playing out in ferrous metals markets.“We’re still at an early phase of tightening in terms of money reaching projects,” said Tomas Gutierrez, an analyst at Kallanish Commodities Ltd. “Iron ore demand reacts with a lag of several months to tightening. Steel demand is still around record highs on the back of the economic recovery and ongoing investments, but is likely to pull back slightly by the end of the year.”For agriculture, credit tightening may only affect China’s soaring crop imports around the margins, said Ma Wenfeng, an analyst at Beijing Orient Agribusiness Consultant Co. Less cash in the system could soften domestic prices by curbing speculation, which may in turn reduce the small proportion of imports handled by private firms, he said.The wider trend is for China’s state-owned giants to keep importing grains to cover the nation’s domestic shortfall, to replenish state reserves and to meet trade deal obligations with the U.S.No DisasterMore broadly, Beijing’s policy tightening doesn’t spell disaster for commodities bulls. For one, the authorities are unlikely to accelerate deleveraging from this point, according the latest comments from the State Council, China’s cabinet.“Internal guidance from our macro department is that the country won’t tighten credit too much -- they just won’t loosen further,” said Harry Jiang, head of trading and research at Yonggang Resouces, a commodity trader in Shanghai. “We don’t have many concerns over credit tightening.”And in any case, raw materials markets are no longer almost entirely in thrall to Chinese demand.“In the past, the inflection point of industrial metal prices often coincides with that of China’s credit cycle,” said Larry Hu, chief China economist at Macquarie Group Ltd. “But that doesn’t mean it will be like that this time too, because the U.S. has unleashed much larger stimulus than China, and its demand is very strong.”Hu also pointed to caution among China’s leaders, who probably don’t want to risk choking off their much-admired recovery by sharp swings in policy.“I expect China’s property investment will slow down, but not by too much,” he said. “Infrastructure investment hasn’t changed too much in the past few years, and won’t this year either.”Additionally, China has been pumping up consumer spending as a lever for growth, and isn’t as reliant on infrastructure and property investment as it used to be, said Bruce Pang, head of macro and strategy research at China Renaissance Securities Hong Kong. The disruption to global commodities supply because of the pandemic is also a new factor that can support prices, he said.Other policy priorities, such as cutting steel production to make inroads on China’s climate pledges, or boosting the supply of energy products, whether domestically or via purchases from overseas, are other complicating factors when it comes to assessing import demand and prices for specific commodities, according to analysts.More stories like this are available on bloomberg.comSubscribe now to stay ahead with the most trusted business news source.©2021 Bloomberg L.P.