How do you get steel outside Earth?

I'm looking for a more economical and efficient method of making steel for my project Death Star Unlimited, a mega infrastructure orbiting Mars with a mass of 500,000,000 metric ton give or take 1%. Is there any good way to make steel in space within a time frame of a decade at most given immediate future tech? I will accept alternative to steel as long as it has similar or better properties and value for money. Currently my team is salvaging from the man-made debris encircling Earth but my engineer told me this is slow and the amount of steel recycled won't be promising.

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How do you get steel outside Earth?

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