焊接方管加工過(guò)程中有很多過(guò)程，每一個(gè)細(xì)節(jié)都是我們需要注意的，大家可以了解一下有關(guān)于高頻焊接方管在加工過(guò)程中熱處理如下：

There are many processes in the processing of welded square tubes, and every detail we need to pay attention to. You can learn about the heat treatment of high-frequency welded square tubes during the processing as follows:

無(wú)錫方管在應(yīng)用之前是需要經(jīng)過(guò)各個(gè)流程的加工的，方管的熱處理是焊接鋼管加工中很重要的一個(gè)環(huán)節(jié)。熱加工首先是將金屬材料放在一定的介質(zhì)內(nèi)加熱、保溫、冷卻，通過(guò)改變材料表面或內(nèi)部的金相組織結(jié)構(gòu)，來(lái)控制其金屬性能的一種金屬熱加工工藝。結(jié)構(gòu)高頻焊管工件在加熱和冷卻過(guò)程中，由于表層和心部的冷卻速度和時(shí)間的不一致，形成溫差，就會(huì)導(dǎo)致體積膨脹和收縮不均而產(chǎn)生應(yīng)力，即熱應(yīng)力。

Before application, Wuxi square pipes need to go through various processes of processing, and the heat treatment of square pipes is a very important link in the processing of welded steel pipes. Hot working is a metal hot working process that first heats, insulates, and cools metal materials in a certain medium, and controls their metal properties by changing the surface or internal microstructure of the material. During the heating and cooling process of structural high-frequency welded pipe workpieces, due to the inconsistent cooling speed and time between the surface and core, a temperature difference is formed, which can lead to uneven volume expansion and contraction, resulting in stress, namely thermal stress.

在熱應(yīng)力的作用下，由于表層開始溫度低于心部,收縮也大于心部而使心部受拉，當(dāng)冷卻結(jié)束時(shí)，由于心部冷卻體積收縮不能自由進(jìn)行而使表層受壓心部受拉。即在熱應(yīng)力的作用下使工件表層受壓而心部受拉。

Under the action of thermal stress, due to the initial temperature of the surface being lower than the center and the shrinkage being greater than the center, the center is subjected to tension. When the cooling is completed, the surface is compressed and the center is subjected to tension due to the inability of the volume contraction of the core to cool freely. Under the action of thermal stress, the surface of the workpiece is compressed while the center is pulled.

這種現(xiàn)象受到冷卻速度，材料成分和熱處理工藝等因素的影響。 當(dāng)冷卻速度愈快，含碳量和合金成分愈高，冷卻過(guò)程中在熱應(yīng)力作用下產(chǎn)生的不均勻塑性變形愈大，形成的殘余應(yīng)力就愈大。另一方面鋼在熱處理過(guò)程中由于組織的變化即奧氏體向馬氏體轉(zhuǎn)變時(shí)，因比容的增大會(huì)伴隨工件體積的膨脹，工件各部位先后相變，造成體積長(zhǎng)大不一致而產(chǎn)生組織應(yīng)力。

This phenomenon is influenced by factors such as cooling rate, material composition, and heat treatment process. The faster the cooling rate, the higher the carbon content and alloy composition, and the greater the uneven plastic deformation generated under thermal stress during the cooling process, resulting in greater residual stress. On the other hand, during the heat treatment process of steel, due to the change in microstructure, i.e. the transformation from austenite to martensite, the increase in specific volume will be accompanied by the expansion of the workpiece volume, and various parts of the workpiece will undergo phase transformation, resulting in inconsistent volume growth and generating structural stress.

組織應(yīng)力變化的結(jié)果是表層受拉應(yīng)力，心部受壓應(yīng)力，恰好與熱應(yīng)力相反。組織應(yīng)力的大小與工件在馬氏體相變區(qū)的冷卻速度，形狀，材料的化學(xué)成分等因素有關(guān)。

The result of changes in organizational stress is tensile stress on the surface and compressive stress on the core, which is exactly the opposite of thermal stress. The magnitude of organizational stress is related to factors such as the cooling rate, shape, and chemical composition of the material in the martensitic transformation zone of the workpiece.