Not just Steel. China is the cheapest manufacturer of solar equipment in the world, panels specifically. These are not being dumped, they are being sold at near cost which is lower than anywhere else in the world.
Regardless of WTO rules and regulations, solar manufacturers in the US and the EU went to the courts to try and block China from selling their goods in these countries. In the EU they were successful and a 50% tariff was levied on Chinese solar products.
in 2015 this led to
The biggest Chinese solar manufacturer, Suntech, went bankrupt partly as a result of global protection against cheap solar panels that China was able to “dump” on the world market.
Oh there was a claim of "dumping" but it was not true. They were just so efficient and had most of the raw materials available to produce them with cheap Chinese labour that the cost of manufacture was below that of anyone else in the world. Had they been selling below cost, they would have gone under long before as they would not have been able to service their expansion loans.
This is pure protectionism and if the EU can do this to the point of bankrupting Chinese companies, then the UK can do it too.
Steel and solar panels are not the only goods this has been done for and they won't be the last. Steel is a different issue. China produced the steel for expected orders then the world market shrank. So they sold it for a loss. Better than holding it for too long and going bust. Western companies do it too. But, again, when it comes down to pressure groups and politicians, the WTO rules take a battering.
The EU has a significant trade imbalance with the UK. Just as China does with the EU. If the EU don't like our "protectionism", they can lump it. Just as we tell China. "Look at the rest of the trade and accept".