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12Cr1MoVG高压合金管热变形应用

网址:www.buxiugangw.cn  2019-04-27  作者:admin    阅读:

由于变形温度高,12Cr1MoVG高压合金管的变形抗力小,塑性好,有利于加工成形,生产效率高,所以热变形是12Cr1MoVG高压合金管塑性加工的主要方法,经常采用的热变形方法有轧制、锻造和挤压等。12Cr1MoVG高压合金管的热变形通常都限制在加工过程的初期,这时,坯料尺寸大,对12Cr1MoVG高压合金管尺寸精度的要求也较宽。很多产品因随后还要进行冷变形,工件表面质量和尺寸精度会得到进一步的改善。对于铸锭进行初期的热变形,在总变形量达到75%以上时,因热变形作用而引起的再结晶,能完全消除原始的铸态组织,形成均匀而细小的晶粒,使12Cr1MoVG高压合金管的塑性得到提高,有利于后继的热变形或冷变形。12Cr1MoVG高压合金管中所含杂质,尤其是有害的硬脆非金属夹杂物,经过多次热变形而细化,并且分布更均匀。再者,压应力在多数热变形中占优势,它可使锭坯中的小裂纹、气泡或疏松等得到焊合,使变形后的材料变得更为坚实。
Because of high deformation temperature, small deformation resistance and good plasticity of 12Cr1MoVG high-pressure alloy pipe, which is beneficial to processing and forming and high production efficiency, hot deformation is the main method of plastic processing of 12Cr1MoVG high-pressure alloy pipe. The hot deformation methods often used include rolling, forging and extrusion. The thermal deformation of 12Cr1MoVG high-pressure alloy tube is usually limited to the initial stage of processing. At this time, the size of billet is large, and the requirement for the dimensional accuracy of 12Cr1MoVG www.yanglaoyua.cnwww.shiguanyin.cnwww.luomazhu.net.cn www.xingtaibanjia.com.cnhigh-pressure www.zhangjiakoubanjia.cnwww.foxiangdiaoke.cnalloy tube is wide. Many products will be further improved in surface quality and dimensional accuracy due to subsequent cold deformation. For the initial thermal deformation of ingot, the recrystallization caused by thermal deformation can completely eliminate the original as-cast structure and form uniform and fine grains when the total deformation reaches 75%, which can improve the plasticity of 12Cr1MoVG high-pressure alloy tube and facilitate subsequent thermal or cold deformation. The impurities in 12Cr1MoVG high pressure alloy tubes, especially the harmful hard and brittle non-metallic inclusions, are refined and distributed more evenly after repeated hot deformation. Furthermore, compressive stress is dominant in most thermal deformation, which can weld small cracks, bubbles or looseness in the billet and make the deformed material more solid.

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