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直縫鋼管退火是把鋼管加熱到一定溫度并在此溫度下保溫，然后緩慢冷卻到室溫。退火有完全退火、球化退火、去應力退火等幾種。
The annealing of a straight steel pipe is to heat the steel pipe to a certain temperature and keep it warm at this temperature, and then slowly cool it to room temperature. There are several kinds of annealing, spheroidizing annealing, stress annealing and so on.
1、將鋼管加熱到預定溫度，保溫一段時間，然后隨爐緩慢冷卻稱為完全退火。目的是降低鋼的硬度，消除鋼中不均勻組織和內應力。
1, the steel pipe is heated to the predetermined temperature, heat preservation for a period of time, and then slow cooling with the furnace is called complete annealing. The purpose is to reduce the hardness of the steel and eliminate the uneven microstructure and internal stress in the steel.
2、把鋼管加熱到750度，保溫一段時間，緩慢冷卻至500度下，最后在空氣中冷卻叫球化退火。目的是降低鋼的硬度，改善切削性能，主要用于高碳鋼。
2, the steel pipe is heated to 750 degrees, heat preservation for a period of time, slowly cooling to 500 degrees, and finally cooling in the air and called spheroidizing annealing. The purpose is to reduce the hardness of the steel and improve the cutting performance, which is mainly used in high carbon steel.
3、去鋼管應力退火又叫低溫退火，把鋼加熱到500～600度，保溫一段時間，隨爐緩冷到300度以下，再室溫冷卻。退火過程中組織不發生變化，主要消除金屬的內應力。
3, to the steel tube stress annealing also called low temperature annealing, the steel heating to 500~600 degrees, heat preservation for a period of time, with the furnace cold to less than 300 degrees, and then cooling at room temperature. The microstructure does not change during the annealing process, which mainly eliminates the internal stress of the metal.
4、正火將鋼管加熱到臨界溫度以上30-50℃,保溫適當時間后，在靜止的空氣中冷卻的熱處理工藝稱為正火。正火的主要目的是細化組織，改善鋼的性能，獲得接近平衡狀態的組織。
4, normalizing the steel tube to the critical temperature above 30-50 degrees C, after the proper time of heat preservation, the heat treatment process of cooling in the static air is called normalizing. The main purpose of the normalizing is to refine the tissue, improve the performance of the steel, and obtain an organization near the equilibrium state.
5、淬火將鋼管加熱到臨界點以上某一溫度,保持一定的時間，然后以適當速度在水中冷卻以獲得馬氏體或貝氏體組織的熱處理工藝稱為淬火。
5, quenching and heating the steel pipe to a certain temperature above the critical point for a certain time, then cooling it in water at appropriate speed to obtain martensitic or bainitic microstructure heat treatment process is called quenching.
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