鋼坯是煉鋼爐煉成的鋼水經過鑄造后得到的產品。鋼坯從制造工藝上主要可分為兩種：模鑄坯和連鑄坯，模鑄工藝已基本淘汰。

從外形上主要分為兩種：

板坯：截面寬、高的比值較大，主要用來軋制板材。

方坯：截面寬、高相等，或差別不大，主要用來軋制型鋼、線材。

鋼坯本來就是鋼材，通過加工以后可以用做機械零件，鍛件，加工各種鋼材，型鋼Q345B槽鋼，線材就是鋼坯的作用。

鋼坯是指用于生產鋼材的半成品，一般不能直接供社會使用。 鋼坯與鋼材是有嚴格劃分標準的，不能以是不是企業最終產品來確定，而要按全社會統一的標準來執行。通常情況下，鋼坯與鋼材是比較容易區分的，但對于某些鋼坯，與鋼材具有同樣規格和同樣用途的（如軋制管坯），可通過是否供其他行業使用、是否經過鋼材加工工藝過程、是否經過成品軋機加工來區分。

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The billet is a product obtained by casting molten steel obtained by a steelmaking furnace. Steel billets can be mainly divided into two types from the manufacturing process: die casting blanks and continuous casting billets, and the die casting process has been basically eliminated.

There are two main types in appearance:

Slab: The ratio of the width to the section is large, and it is mainly used for rolling sheets.

Billet: The section is wide and high, or the difference is not large. It is mainly used for rolling steel and wire.

The steel billet is originally steel. After processing, it can be used as mechanical parts, forgings, processing various steels, steel Q345B channel steel, and wire is the role of steel billets.

Steel billet refers to the semi-finished product used to produce steel, which is generally not directly available for social use. Billet and steel are strictly divided and cannot be determined by the final product of the enterprise, but by the unified standards of the whole society. In general, billets and steels are relatively easy to distinguish, but for some billets, the same specifications and the same use as steel (such as rolled billet) can be used for other industries, whether it is through the steel processing process. Whether it is processed by the finished rolling mill to distinguish.