不锈钢复合管的轧制耐腐蚀性 |
添加时间:2018/12/15 14:06:47 浏览次数: |
不锈钢是建筑用金属材料中强度最高的材料。不锈钢复合管由不锈钢和碳素结构钢两种金属材料采用无损压力同步复合成的新材料,兼具不锈钢抗腐蚀耐磨和卓越美丽的外表,以及碳素钢良好的抗弯强度及抗冲击性。不锈钢的压力加工特性为: 奥氏体钢的轧制特点。钢的导热性低,1Cr18Ni9Ti的导热系数仅为低碳钢的27%,随着温度的升高,这种差别逐渐减少。此类钢无组织应力产生。 Stainless steel is the highest strength material of metal materials for construction. Stainless steel clad pipe is a new material made of stainless steel and carbon structural steel, which is made of non-destructive pressure synchronous composite material. It has both corrosion resistance and wear resistance of stainless steel and excellent beautiful appearance, as well as good flexural strength and impact resistance of carbon steel. Pressure processing characteristics of stainless steel are: rolling characteristics of austenitic steel. The thermal conductivity of steel is low, and the thermal conductivity of 1Cr18Ni9Ti is only 27% of that of low carbon steel. With the increase of temperature, the difference decreases gradually. No structural stress occurs in this kind of steel. 不锈钢是建筑用金属材料中强度最高的材料。不锈钢复合管由不锈钢和碳素结构钢两种金属材料采用无损压力同步复合成的新材料,兼具不锈钢抗腐蚀耐磨和卓越美丽的外表,以及碳素钢良好的抗弯强度及抗冲击性。不锈钢的压力加工特性为: 奥氏体钢的轧制特点。钢的导热性低,1Cr18Ni9Ti的导热系数仅为低碳钢的27%,随着温度的升高,这种差别逐渐减少。此类钢无组织应力产生。 Stainless steel is the highest strength material of metal materials for construction. Stainless steel clad pipe is a new material made of stainless steel and carbon structural steel, which is made of non-destructive pressure synchronous composite material. It has both corrosion resistance and wear resistance of stainless steel and excellent beautiful appearance, as well as good flexural strength and impact resistance of carbon steel. Pressure processing characteristics of stainless steel are: rolling characteristics of austenitic steel. The thermal conductivity of steel is low, and the thermal conductivity of 1Cr18Ni9Ti is only 27% of that of low carbon steel. With the increase of temperature, the difference decreases gradually. No structural stress occurs in this kind of steel. 在900-1250℃,这类钢有良好的塑性。随着温度下降,变形抗力急剧增高,终轧温度不应低于850℃。在型钢轧制中,这类钢的宽展系数几乎是碳钢的1.5倍,又因为其变形抗力大,所以要采用小压下量和万能孔型。 奥氏体钢的调质处理。奥氏体不锈钢经冷加工后达到的各种强度是根据调质来分类的,而调质的种类则是根据所规定的抗拉强度或屈服强度的最小值,或者二者的最小值来区分的。调质的范围从软化退火型或退火加调质轧制型到高张力型 马氏体钢的轧制特点。钢的导热性较差,导热系数稍高于1Cr18Ni9Ti,而且有较大的组织应力和热应力。 This kind of steel has good plasticity at 900-1250 C. As the temperature decreases, the deformation resistance increases sharply, and the final rolling temperature should not be lower than 850 C. In section steel rolling, the width coefficient of this kind of steel is almost 1.5 times that of carbon steel, and because of its large deformation resistance, small reduction and universal pass should be adopted. Tempering treatment of austenitic steel. The strength of austenitic stainless steel after cold working is classified according to quenching and tempering, and the types of quenching and tempering are classified according to the minimum value of the specified tensile strength or yield strength, or the minimum value of both. The range of quenching and tempering ranges from softening annealing or annealing plus quenching rolling to rolling characteristics of high tension martensitic steel. The thermal conductivity of steel is poor, its thermal conductivity is slightly higher than that of 1Cr18Ni9Ti, and it also has larger structural stress and thermal stress. 钢坯要预热到550℃,在800℃以下要缓慢加热,最高加热温度不应超过1250℃。马氏体不锈钢对热应力很敏感,所以冷却速度要很缓慢。3Cr13、4Cr13要在850℃以上开始缓冷,直至低于150℃,否则,容易出现裂纹。在清理表面缺陷前,还应进行软化退火,以免产生研磨裂纹。轧制时变形抗力较大,4Cr13的变形抗力为低碳钢的1.6倍,所以不宜采用大压下量轧制。又因该类钢在900-1200℃有较好的塑性,所以终轧温度应在900℃以上。 The billet should be preheated to 550 and slowly heated below 800 C. The maximum heating temperature should not exceed 1250 C. Martensitic stainless steel is sensitive to thermal stress, so the cooling rate is very slow. 3Cr13 and 4Cr13 should be slowly cooled above 850 C until they are below 150 C. Otherwise, cracks will occur easily. Before cleaning surface defects, softening annealing should be carried out to avoid abrasive cracks. The deformation resistance of 4Cr13 is 1.6 times higher than that of low carbon steel, so it is not suitable to use large reduction rolling. Because the steel has good plasticity at 900 - 1200 C, the final rolling temperature should be above 900 C. |
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