HONG KONG--Africa's biggest bank has joined China's largest securities firm in suing to get control of stocks of metals in Chinese warehouses that lenders believe may have been fraudulently used as collateral for loans.

The latest suit, by Standard Bank Group Ltd., Africa's largest lender by assets, shows the global dimensions of a suspected lending fraud at Qingdao port on China's eastern seaboard. It follows a lawsuit filed this week by Citic Resources Holdings Ltd., whose parent company is Citic Group, one of China's largest state-owned companies and a big financial concern.

Lenders are increasingly frustrated that they can't get access to warehouses at the port that are at the center of the suspected fraud.

Banks have lent hundreds of millions of dollars to Chinese commodities traders in recent years, using metals such as copper, iron ore and aluminum as collateral. These lenders are worried that in some cases, the same collateral has been promised for loans multiple times.

Standard Bank said its exposure to possibly missing aluminum at Qingdao is $170 million, and that it is moving to secure an additional $40 million also held in Shandong province. That adds to $250 million in exposure disclosed by Standard Chartered PLC, and about $50 million disclosed by Citic Resources to push the tally of exposure above $500 million.

Industry executives believe Chinese banks could be on the hook for more if loans backed by metals stored at the port of Qingdao go bad. Estimates of the losses they could face run into the billions of dollars.

"These legal proceedings are part of a process undertaken by the group to take all available steps to protect its position in respect of these stocks," Standard Bank said in a statement. "The group's gross exposure in respect of this aluminum is equivalent to US$170 million."

The action in Shandong province is being taken by Standard Bank PLC, the London-based unit of Standard Bank Group, which is also starting legal proceedings to secure an additional $40 million of aluminum stocks at other warehouses in Shandong.

The lender declined to say whom its legal proceedings in China were targeting. Qingdao Port International Ltd. which operates the port, on June 6 said Chinese authorities were conducting a probe into metals stored there. Chinese authorities haven't publicly commented on the probe.

A spokesman for the port authority said it hadn't received any notice of a lawsuit, and that it is cooperating with the local public-security bureau as it investigates.

Standard Bank has close ties to China. It is 20% owned by Industrial & Commercial Bank of China Ltd., China's largest bank by assets. In January, ICBC said it would buy a controlling stake in the business that filed the suit, Standard Bank Group Ltd.'s U.K. commodities and foreign-exchange-trading business. That deal has yet to close.

"China remains a key market for Standard Bank and it will continue to provide commodity financing. Standard Bank is committed to this business and to its clients in this sector," the bank said in a release.

Western banks have been shut out of warehouses in both Qingdao and Penglai, a second port, also in Shandong province, where concern about fraud has also arisen.

The estimates of exposures cover all of the warehouses at Qingdao port, but so far the probe has focused on Dagang, a smaller unit at the port. The worry for bankers is that the potential fraud may be found to be more widespread at Qingdao, or elsewhere, according to banking executives familiar with the matter.

Other foreign banks that have exposure to Qingdao are the Netherlands' ABN Amro Bank NV, France's BNP Paribas SA and Natixis, and Citigroup Inc. in the U.S., people familiar with the matter have said.

BNP, Citigroup, Natixis and Standard Chartered declined to comment. ABN Amro didn't respond to a request for comment.

The lawsuit is the second to be announced in recent days. Citic Resources has entered a claim against the warehouse operator at Qingdao port, the mining and trading company said in a filing released Tuesday. It didn't identify the warehouse operator.

Their claim, filed in Qingdao Maritime Court, requires the operator to confirm Citic Resources' ownership of the $50 million in aluminum it had stored at Qingdao port and either deliver those metals to Citic Resources or compensate the company for them, the filing said.

Write to Enda Curran at enda.curran@wsj.com

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