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劣质钢管容易出现哪些现象?

添加时间:2019-08-19      发布人:http://www.jzqgc.com

  钢管(钢管生产技术的发展开始于自行车制造业的兴起,发展,石油在19世纪早期,在两次世界大战期间船舶、锅炉、飞机制造、二战后火电锅炉制造、化工、石油和天然气钻探和交通运输的发展,有效地推动钢管行业发展的品种、产量和质量。
  The development of steel pipe production technology began with the rise and development of bicycle manufacturing industry. In the early nineteenth century, petroleum industry effectively promoted the development of varieties and production of steel pipe industry through the development of ships, boilers, aircraft manufacturing, post-World War II thermal power boiler manufacturing, chemical industry, oil and gas drilling and transportation. Quantity and quality.
  钢管不仅用于输送流体和粉状固体、交换热能、制造机械零件和容器,而且是一种经济适用的钢材。采用钢管制造结构网架、支柱和机械支架,可减轻重量,节约金属20 ~ 40%,可实现工厂机械化施工。利用钢管制造公路桥梁,不仅可以节约钢材,简化施工,而且大大减少了保护层面积,节约了投资和维护成本。
  Steel pipe is not only used for conveying fluids and powder solids, exchanging heat energy, manufacturing mechanical parts and containers, but also an economical and applicable steel. The steel pipe is used to manufacture the structure net frame, pillar and mechanical support, which can reduce the weight and save 20 - 40% of the metal, thus realizing the mechanized construction of the factory. Making highway bridges with steel pipes can not only save steel and simplify construction, but also greatly reduce the area of protection layer and save investment and maintenance costs.
  1. 假钢管容易折叠。
  1. False steel pipe is easy to fold.
  折叠是在钢管表面形成的各种折线。这种缺陷往往贯穿整个产品的纵向。折叠的原因是由于假冒伪劣厂家追求率,压下量大,生产出的耳朵,下次滚压上生产的折叠,折叠后的产品弯曲后会开裂,钢材的强度下降。
  Folding is a variety of folding lines formed on the surface of steel pipe. This kind of defect often runs through the longitudinal of the whole product. The reason for folding is that fake and inferior manufacturers pursue high efficiency, large reduction, the ears produced, folding on the next rolling, the folded products will crack after bending, and the strength of steel decreases.
  2. 假钢管的外表往往有麻子。
  2. The appearance of false steel pipe is often pockmarked.
  麻点表面是轧辊沟槽磨损严重引起的钢表面不规则的不均匀缺陷。由于劣质钢管生产企业为了追求利润,经常出现轧制坡口轧制超标的情况。
  The pitted surface is an irregular and uneven defect on the surface of steel caused by serious groove wear of rolls. In order to pursue profits, the production enterprises of inferior steel tubes often have the situation that the groove rolling exceeds the standard.
  3.假钢管表面容易产生疤痕。
  3. The surface of false steel pipe is prone to scar.
  有两个原因:(1)。劣质钢管材料不均匀,杂质较多。(2).伪劣材料生产厂家生产的导卫设备简单,容易粘钢,这些杂质咬人轧辊后容易产生疤痕。
  There are two reasons: (1). The material of inferior steel pipe is not uniform and there are many impurities. (2) The guide equipment produced by the manufacturers of fake and inferior materials is simple and easy to stick to steel. These impurities bite the roll and easily cause scars.
  4. 假材料表面容易产生裂纹,其原因是其坯料是土坯、土坯气孔、土坯在冷却时产生的过大
  4. Cracks are easy to occur on the surface of false material because the billet is too large when the billet is cooled.
济南钢筋批发
  在加工过程中产生热应力,产生裂纹,轧制后产生裂纹。
  Thermal stress and cracks occur during the process of processing, and cracks occur after rolling.
  5. 假钢管容易划伤,原因是假钢管厂家设备简单,容易产生毛刺,划伤钢材表面。深度划伤会降低钢的强度。
  5. False steel pipe is easy to scratch, because the fake steel pipe manufacturer has simple equipment, easy to produce burrs, scratch the steel surface. Deep scratches reduce the strength of steel.
  6. 假钢管无金属光泽,呈淡红色或类似生铁的颜色,原因有两点二,其坯料为土坯。2、劣质材料轧制温度不达标,其钢材温度是目测的,所以不能按照奥氏体区规定轧制,钢材的性能自然不能达到标准。
  6. Pseudo-steel pipe has no metallic luster and is light red or similar to pig iron. There are two reasons for this. Its blank is adobe. 2. The rolling temperature of inferior materials is not up to the standard, and the temperature of steel is visually measured, so it can not be rolled in accordance with the provisions of austenite zone, so the properties of steel can not meet the standard naturally.
  7. 假的单杠钢管是薄和低,经常出现填不满的现象,原因是制造商为了达到大负公差,成品前几个压力体积偏大,小铁,洞填不满。
  7. The fake horizontal bar steel pipe is thin and low, and it is often unsatisfactory to fill. The reason is that in order to achieve large negative tolerance, the manufacturer has large pressure volume in the first few parts of the finished product, small iron and hole filling are unsatisfactory.
  8. 假的部分钢管椭圆,原因是厂家为了节省材料,成品卷第二卷之前压力很大,这种钢筋的强度大大降低,而且也不符合钢筋尺寸标准。
  8. False part of steel tube ellipse, because the manufacturer in order to save material, finished volume before the second volume of the pressure is very high, the strength of this steel bar is greatly reduced, but also does not meet the steel bar size standards.
  9. 钢的成分是均匀的,冷剪机的吨位高,切割头的端面光滑整洁,伪劣材料由于材料质量差,切削头的端面经常有肉的现象,也就是说,不均匀,没有金属光泽。而且由于劣质材料厂家产品割头少,头尾会出现大耳子。
  9. The composition of high-quality steel is uniform, the tonnage of cold shear is high, the end face of cutting head is smooth and tidy, and the fake and inferior materials often have meat on the end face of cutting head because of poor material quality, that is to say, it is not uniform and has no metallic luster. And because the products of inferior material manufacturers cut little, big ears will appear at the head and tail.
  10. 假钢管材料含有大量杂质,钢的密度小,尺寸超差严重,所以在没有游标卡尺的情况下,可以称重检查。钢筋20,例如,大负公差标准规定的5%,规模9米的单一的理论重量是120公斤,应该是小的重量:120 X (l - 5%) = 114公斤,114公斤称出的重量比小单,是伪劣钢铁,原因是它是负公差超过5%。一般来说,积分比例量的效果较好,主要考虑累积误差问题和概率论。
  10. Pseudo-steel pipe material contains a lot of impurities, the density of steel is small, and the dimension of the steel is excessive, so in the absence of vernier calipers, it can be weighed and checked. Reinforcement 20, for example, 5% of the national standard for maximum negative tolerance and 120 kg of single theoretical weight of 9 meters should be the smallest weight: 120 X (l - 5%) = 114 kg. The weight of 114 kg is smaller than that of single steel, which is fake and inferior because it has a negative tolerance of more than 5%. Generally speaking, the effect of integral proportion is better, mainly considering the cumulative error problem and probability theory.
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