鍍鋅方管，顧名思義，就是表面鍍有鋅的方形管材。方管，是方形管材的一種稱呼，也就是邊長相等的的鋼管。是帶鋼經(jīng)過工藝處理卷制而成。一般是把帶鋼經(jīng)過拆包，平整，卷曲，焊接形成圓管，再由圓管軋制成方形管然后剪切成需要長度。一般是50根每包。

Galvanized square pipe, as its name implies, is a square pipe with galvanized surface. Square pipe is a form of address for square pipe, that is, steel pipe with equal side length. The strip is coiled by process treatment. Generally, strip steel is unpacked, flattened, coiled, welded to form a circular pipe, then rolled into a square pipe from the circular pipe and cut into the required length. Usually 50 pieces per bag. 

方管有無縫和焊縫之分。

There are seamless and welded square pipes.

無縫方管是一種具有中空截面，周邊沒有接縫的長條鋼材。鋼管具有中空截面，大量用作輸送流體的管道，如輸送石油、天然氣、煤氣、水及某些固體物料的管道等。鋼管與圓鋼等實心鋼材相比，在抗彎抗扭強度相同時，重量較輕，是一種經(jīng)濟截面鋼材，廣泛用于制造結構件和機械零件，如石油鉆桿、汽車傳動軸、自行車架以及建筑施工中用的鋼腳手架等。用鋼管制造環(huán)形零件，可提高材料利用率，簡化制造工序，節(jié)約材料和加工工時，如滾動軸承套圈、千斤頂套等，目前已廣泛用鋼管來制造。鋼管還是各種常規(guī)武器不可缺少的材料，槍管、炮筒等都要鋼管來制造。鋼管按橫截面積形狀的不同可分為圓管和異型管。由于在周長相等的條件下，圓面積最大，用圓形管可以輸送更多的流體。此外，圓環(huán)截面在承受內(nèi)部或外部徑向壓力時，受力較均勻，因此，絕大多數(shù)鋼管是圓管。但是，圓管也有一定的局限性，如在受平面彎曲的條件下，圓管就不如方、矩形管抗彎強度大，一些農(nóng)機具骨架、鋼木家具等就常用方、矩形管。

Seamless square pipe is a kind of long steel with hollow section and no joint around it. Steel pipe has hollow section, which is widely used as pipeline for conveying fluids, such as oil, natural gas, gas, water and some solid materials. Compared with solid steels such as round steel, steel pipe has lighter weight when its bending and torsion strength is the same. It is an economic section steel. It is widely used in manufacturing structural and mechanical parts, such as oil drill pipe, automobile transmission shaft, bicycle frame and steel scaffolding used in construction. Manufacturing ring parts with steel pipes can improve material utilization, simplify manufacturing process, save material and processing time, such as rolling bearing rings, Jack sleeves and so on. At present, steel pipes have been widely used in manufacturing. Steel pipe is also an indispensable material for all kinds of conventional weapons. Tubes, barrels, etc. are made of steel pipe. Pipe can be divided into circular pipe and special-shaped pipe according to the shape of cross-section area. Because the circular area is the largest under the condition of equal circumference, more fluid can be transported by the circular pipe. In addition, when the ring section is subjected to internal or external radial pressure, the force is more uniform, so the vast majority of steel tubes are circular tubes. However, the circular pipe also has some limitations. For example, under the condition of plane bending, the circular pipe is not as strong as square and rectangular pipe. Some agricultural machinery skeleton, steel and wood furniture are commonly used square and rectangular pipe.

焊縫是用一對滾盤電極代替點焊的圓柱形電極，與工件作相對運動，從而產(chǎn)生一個個熔核相互搭疊的密封焊縫的焊接方法。

The welding seam is a kind of welding method that uses a pair of disc electrodes instead of spot welding cylindrical electrodes to move relative to the workpiece, thus producing a sealed weld with overlapping nuggets.

方管的性能指標

Performance Index of Square Tube

塑性：是指金屬材料在載荷作用下，產(chǎn)生塑性變形（永久變形）而不破壞的能力。

Plasticity: refers to the ability of metal materials to produce plastic deformation (permanent deformation) without destroying under load.

硬度：是衡量金屬材料軟硬程度的指針。常用的方法有布氏硬度（HB）、洛氏硬度（HRA、HRB、HRC）和維氏硬度（HV）等方法。

Hardness: It is a pointer to measure the degree of hardness and softness of metal materials. Common methods include Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC) and Vickers hardness (HV).

疲勞度：機器零件在循環(huán)載荷下工作的，在這種條件下零件會產(chǎn)生疲勞。

Fatigue: Machine parts work under cyclic loads, under which conditions parts will produce fatigue.

沖擊韌性：以很大速度作用于機件上的載荷稱為沖擊載荷，金屬在沖擊載荷作用下抵抗破壞的能力叫做沖擊韌性。

Impact toughness: The load acting on the machine parts at a great speed is called impact load, and the ability of metal to resist damage under impact load is called impact toughness.

強度：強度是指金屬材料在靜荷作用下抵抗破壞（過量塑性變形或斷裂）的性能。

Strength: Strength refers to the resistance of metal materials to failure (excessive plastic deformation or fracture) under static load.