Steel is an alloy of iron and carbon. Coking coal is a source of carbon in the smelting process.

钢是铁与碳的合金，焦煤便是熔炼过程中碳的来源。

youdao

Top low carbon alloy steel as gear material, adapting automatic carburizing and quenching heat treatment.

齿轮材料选用高级低碳合金钢，使用自动化高温渗碳淬火处理。

youdao

Applicable to high tensile strength metal grinding, such as general carbon steel, alloy steel, malleable iron hard bronze.

适用于中高抗张强度金属材料的磨削，如一般碳素钢，合金钢，可锻铸铁，硬青铜等。

youdao

Some kind of organic metallic alloy stronger than titanium or carbon steel, harder than diamonds.

NPR: Summary Judgment: 'Fantastic Four,' 'Dark Water'

In the materials group, Reliance Steel, one of the largest U.S. metals service centers, distributes a line of more than 100, 000 metal products, including carbon, alloy, stainless and specialty steel, aluminum, brass as well as copper products.

FORBES: Market's January Advance Bodes Well For Financial, Tech And Materials Stocks - And Obama

They are toughened with diamond-like carbon from the semiconductor industry and this is bonded on to the steel with niobium, a rare tin alloy normally used in superconducting magnets.

ECONOMIST: Skinned alive