Construction steel refers to a kind of steel which is specially used in the construction industry and participates in the construction. In the construction industry, steel bar, steel pipe and other construction steel are the most common. Steel bar is an indispensable framework for the construction of concrete, and steel pipe is an important role in the construction of scaffolding and other worker operating sites. Construction steel products in the market are also classified into grades and varieties, today we will mainly introduce the classification of construction steel grades according to processing methods.

　　按加工办法对钢筋停止等级划分，则可分为热轧钢筋、热处置钢筋、冷拉钢筋、冷拔低碳钢丝和钢绞线管五个品种。

　　According to the processing method, the steel bar stopping grade can be divided into five varieties: hot-rolled steel bar, heat treatment steel bar, cold-drawn steel bar, cold-drawn low carbon steel wire and stranded steel pipe.

　　热轧钢筋是经过热轧处置后自然冷却的一种钢筋，由低碳钢和普通合金钢构成，且处于高温状态下扎支撑，是钢筋混凝土和预应力混泥土构造的主要的配筋，同时也是土木建筑工程中常用的废品钢筋。

　　Hot-rolled steel bar is a kind of steel bar which is naturally cooled after hot-rolling disposal. It is composed of low carbon steel and common alloy steel, and is tied and supported at high temperature. It is the most important reinforcement for reinforced concrete and prestressing concrete structure, and is also the most commonly used waste steel bar in civil engineering.

　　热轧的带筋钢筋经淬火和高温回火调质处置而成的就是热处置钢筋；冷拉钢筋则是在常温状态下对钢筋停止一定的拉伸而成的；经过拔制产生冷加工硬化的低碳钢丝就是冷拔低碳钢丝。而钢绞线管则是多根钢丝绞合而成的钢丝制品。

　　Hot-rolled steel bars are treated by quenching and tempering at high temperature to form heat-treated steel bars; cold-drawn steel bars are made by stopping certain stretching at room temperature; cold-drawn low-carbon steel wires are cold-drawn low-carbon steel wires that produce cold-worked hardening after drawing. The stranded pipe is a steel wire product which is made up of several steel wires.

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