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球墨铸铁井盖与普通灰口铸铁井盖有哪些区别?

来源:http://www.kpp647.com添加时间:2020-05-05 15:47:58

1、 球墨铸铁强度高、韧性好,因此球墨铸井盖比同类型灰口铸铁井盖轻30%左右。球墨铸铁牌号采用QT500-7,铁水出炉温度不低于1456℃,在球化处理时增配稀土硅铁镁合金和选用含硫量低的焦碳,球化级别达三级以上。球墨铸铁试件的力学性能如下: 抗拉强度:500N/MM 2 延伸率:7%

1. Nodular cast iron has high strength and good toughness, so it is about 30% lighter than the same type of gray cast iron. QT500-7 is adopted for nodular cast iron, and the temperature of molten iron is not lower than 1456 ℃. Rare earth ferrosilicon magnesium alloy and coke with low sulfur content are added during nodularization treatment, and the level of nodularization is above grade III. The mechanical properties of ductile iron are as follows: tensile strength: 500N / mm2, elongation: 7%

2、 灰铁的石墨是平扁片状的,球铁的石墨是圆球状的。敲击球墨铸铁如发出近似敲击碳钢的声音,说明球墨铸铁球化不错。而灰铁敲击声音听起来,很闷。

2. Graphite of gray iron is flat and flat, graphite of nodular iron is round and spherical. If the percussion of nodular cast iron makes a sound similar to that of carbon steel, it indicates that nodularization of nodular cast iron is good. And the sound of gray iron knocking is very dull.

3、 关于球化率问题,可以这么说,同样是球墨铸铁的产品,球化率不同,那质量也就不同,价格上也有很大区别。一般工厂已球化率达到85%为合格产品。球化率85%以下的是因为铸造的时候,没有球化好而造成铁水温度低,制造出来的产品承载压力达不到要求。

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3. As for the spheroidization rate, it can be said that the products of nodular cast iron with different spheroidization rate will have different quality and different prices. Generally, the qualified products are those with the spheroidization rate of 85%. The spheroidization rate is less than 85% because of the low temperature of molten iron caused by the lack of spheroidization during casting, and the bearing pressure of the products can not meet the requirements.

4、 从断口(不是经过机械加工的表面)的外观可以简单区别球铁和灰铁,用肉眼观察,灰铁断口的晶粒比较粗大,为灰白色,晶面有金属光泽。球铁的断口晶粒很细小,为黑灰色,如果球化好的话几乎没有金属光泽,如果有发白的光泽,一般情况是出现白口组织。

4. From the appearance of fracture (not machined surface), ductile iron and gray iron can be simply distinguished. Through visual inspection, the grains of fracture of gray iron are relatively coarse, gray white, and the crystal surface has metallic luster. The fracture grain of nodular iron is very small, which is black gray. If it is spheroidized well, it has almost no metallic luster. If it has white luster, it usually has white mouth structure.

5、 从冶炼方法来说,球铁是在冶炼时在灰铁中加孕育剂与球化剂使石墨由分散的团絮状变成球状,以减小对铁素体的割裂,增大强度,提高性能来达到的.

5。 In terms of smelting method, nodular iron is achieved by adding inoculant and nodulizer to gray iron to make graphite change from dispersed flocculent to globular, so as to reduce the cleavage of ferrite, increase strength and improve performance

6、 而灰铁井盖则是不添加任何辅助原料,将生铁直接冶炼成铁水,然后浇筑成井盖。但是球墨铸铁井盖则是要添加球化剂、稀土镁等其他金属合金而成的,浇筑前向铁水中加入一定量的球化剂进行球化处理,并加入少量的孕育剂以促进石墨化,在浇注后直接获得具有球状石墨结晶的铸铁,所以现在市场上和有关部门要求用球墨铸铁井盖。那是因为球墨铸铁井盖,在承载能力上远远超过了灰铁井盖。

6。 The gray iron well cover is to smelt pig iron directly into molten iron without adding any auxiliary materials, and then pour it into the well cover。 But nodular cast iron manhole cover is made by adding nodular agent, rare earth magnesium and other metal alloys。 Before pouring, a certain amount of nodular agent is added to the molten iron for nodular treatment, and a small amount of inoculant is added to promote graphitization。 After pouring, the cast iron with nodular graphite crystals is directly obtained。 Therefore, the market and relevant departments require the use of nodular cast iron manhole cover。 That's because ductile iron manhole covers far exceed gray iron manhole covers in bearing capacity。

关于山东球墨铸铁井盖http://www.kpp647.com就先介绍到这里了,相信大家在实际的工作中会用到相关知识,如果您有这方面的需要,欢迎前来选购。

About Shandong nodular cast iron manhole cover http://www.kpp647.com introduced here first, I believe you will use the relevant knowledge in the actual work, if you have this need, welcome to purchase.



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