Steel and iron have long been confused by many people, and accordingly cast steel and cast iron have been confused for a long time.In fact, whether it is steel and iron, or cast steel and cast iron, there is a difference between different materials, both in manufacture and in nature. Cast steel and cast iron are both common valve materials, so how exactly to distinguish it?Today TWT,a leading gate valve factory from China would like to take buyers focus on cast iron and cast steel.
The essential difference between cast iron and cast steel is that the chemical composition is different, in engineering, it is generally believed that the carbon content is higher than 2% for iron, below this value for steel. Because of the different compositions, so the organisational properties are not the same, in general, the cast steel plasticity and toughness is better, as shown by the elongation, section shrinkage and impact toughness is good, the mechanical properties of cast iron is shown as hard and brittle.
So what is the difference between cast steel and cast iron when used in the manufacture of gate valves? If you are interested, follow TWT,China to take a look.
Difference between cast iron and cast steel in performance
Cast steel and cast iron are very similar in appearance, but there is a clear difference in performance:
- The cast steel has high strength, wear resistance, corrosion resistance, stable performance and so on, suitable for the manufacture of high-quality, high-performance, high-security requirements of the parts and machine parts.
- The cast iron’shardness, toughness, strength and impact resistance is poor, but the physical properties are stable, and has good wear resistance and good friction properties, so cast iron is used in some requirements for strength is not particularly high, but need to have pressure, wear, corrosion-resistant parts.China cast iron gate valve are widely used in areas requiring high wear, pressure, corrosion and friction resistance,such as pping for media such as gas, liquid petroleum gas, air, water, oil, low corrosive liquids, etc.
Distinguish between cast iron and cast steel in real life:
Cast steel is bright cast iron is dark and grey, cast iron inside the grey iron and ductile iron and different, ductile iron is brighter than grey iron.
Cast steel is very dense and generally invisible to the naked eye particles. Grey iron and ductile iron can be seen particles, grey iron particles larger.
Cast steel parts collision is “just”, and cast iron parts sound is not the same.
- Gas cutting.
Cast steel surface roughness, risers, sprues are large, must be cut to remove. Ductile cast iron gas cutting is not constant.
Cast steel toughness close to steel plate, ductile iron toughness is slightly inferior, thin-walled parts can reach 20-30 degrees of bending, grey mouth without toughness.
These same paths apply to distinguishing cast steel gate valves from cast iron gate valves, especially the more aesthetically pleasing appearance of cast steel produced by China cast steel gate valve supplier like TWT.
Main types of cast iron/steel gate valves
Besides material,types of gate valve are worthy considering while selcting gate valves.Here TWT,China provide a brief,and we will give further information in other articles.
Rising stem gate valve is a common type of valve with a simple structure and easy and reliable operation. Rising stem refers to the position where the valve’s operating lever can be directly seen and touched.Rising stem gate valves are characterised by easy observation of the operating lever, easy operation and easy maintenance.
Non-rising stem gate valve is also a common type of valve, compared to the open stem gate valve, its operating rod is hidden inside the valve is not easy to observe. The operating rod is not exposed and is not easily damaged or contaminated, and the operating rod handle does not cause traffic safety hazards.