straight seam steel pipe deformation

There are four ways to handle the straight seam steel pipe in the preheat deformation.


First, reasonable raw material selection. For precision mould, you should select high quality micro deformation of steel material. The serious die steel with carbide segregation should do tempering heat treatment reasonably. For the larger or unable casting die steel, the solution is carried out the double quenching heat treatment. It is essential to choose rational heating temperature and control the heating speed. The precision mold can adopt slow heating, preheating and other balanced heating approaches to reduce the straight seam steel pipe deformation during the treatment.

Second, correct heat treatment operation and reasonable tempering heat treatment are also useful ways to reduce precision straight seam pipe deformation. For the precision mold deformation, the reason is often messy. But we only need to grasp the rules of deformation and analyze the attack cause. Then we can adopt abnormal methods to avoid mold deformation. As a result, it will reduce and control the straight seam steel pipe deformation.

Third, the straight seam welded steel pipe mold should do heat treatment in advance so as to eliminate the remaining stress of the attack in machining process. Condition permitting, we had better choose vacuum heat quenching and cryogenic treatment after quenching. In order to guarantee the mold hardness, we try our best to select pre-cooling, decentralized cooling quenching or warm quenching process.

In the end, The mould planning should be reasonable, the thickness is not too intervallic and the shape is also symmetry. The steel pipe deformation should master the deformation rules and reserve working allowance. Sophisticated messy mold can be used in combination planning. For some precision messy mold can adopt pre-heat treatment, aging heat treatment, quenched and tempered nitriding heat treatment as to control the accuracy of the mold. During the repair of mold sand holes, pores, wear and other defects, the choice of cold welding is very important, because it can avoid the repair process deformation of the attack.