soft steel

noun

Origin of soft steel

First recorded in 1865–70

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

soft steel and cast iron will have the appearance of an ash-gray tint; tempered steels will be black; and pudp.
Practical Mechanics for Boys | J. S. Zerbe
When the letters are to be engraved in steel, blocks or "blanks" are cut from soft steel and finished to the proper size.
The Building of a Book | Various
I imagine one would use a soft steel or ivory slip rubbed over with fine diamond dust and oil by means of an agate.
On Laboratory Arts | Richard Threlfall
It has the effect of forming a very hard and durable skin on the surface of soft steel, leaving the inside unaffected.
Oxy-Acetylene Welding and Cutting | Harold P. Manly
The original die is engraved on a block of soft steel of very fine and even quality.
Canada: Its Postage Stamps and Postal Stationery | Clifton Armstrong Howes

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