Car, train and aircraft makers are investigating whether they have used
any sub-standard materials made by Kobe Steel.
The metals were delivered to hundreds of companies including car
manufacturers, aeroplane firms and the space industry.
The checks come after Japan's third largest steelmaker admitted
falsifying quality data, possibly for as long as a decade.
General Motors,Boeing and Toyota are among the firms checking their
models.
An internal investigation at Kobe Steel found 70 cases of data tampering
at its Kobelco Research unit.
Shares in Kobe Steel fell by nearly 40% in two days, wiping more than
$1.5bn (£1.1bn) off its market value after the firm admitted fabricating data
about the strength and durability of products it delivered to more than 200
companies.
The metal scandal broke after Kobe Steel, one of the key Asian metal
producers, said its staff had given false strength and durability ratings.
Kobe Steel spokesman Gary Tsuchida told the BBC the firm regrets the
falsification of data.
"There were tens of employees involved. It seems in some cases
quality control was undertaken by veteran employees who had lots of experience,
highly trusted within the organisation, and somehow these discrepancies slipped
by them."
Widening crisis
In Japan and abroad, manufacturers that have used Kobe Steel materials
have been racing to check that the safety of their own products has not been
compromised.
Central Japan Railway said some Kobe Steel parts for its bullet trains
did not meet Japanese industrial standards, but there were no safety issues.
Hitachi said its new trains in Britain used Kobe Steel but had all passed
rigorous tests.
US plane manufacturer Boeing also said it had not found any safety
issues. But Mazda said it was still investigating after it used Kobe aluminium
in some car bonnets.
And Honda said that aluminium produced by Kobe Steel had been used in
doors and bonnets of some of its cars.
The crisis at Kobe Steel is the latest in a string of recent scandals at
major Japanese companies.
They include cases of falsified data at Nissan Motor and Mitsubishi
Motors, while air bag maker Takata filed for bankruptcy in June over faulty
airbags which were blamed for several deaths and many injuries.
Toshiba is still working to recover from an accounting scandal that began
in 2015.
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