The Difference Between High Manganese Steel and Stainless Steel

The difference between high manganese steel and stainless steel


Compared with 304 stainless steel, high manganese steel increases the manganese content and reduces nickel, and with weaker corrosion resistance. Meanwhile, the appearance glossiness of high manganese steel is not as bright as 304 stainless steel. However, high manganese steel is still widely used in many fields because of its advantages of low cost.


High manganese steel is not suitable for use in chemical environments such as acids and alkalis. Nevertheless, It is ideal for the manufacture of tableware, indoor water storage equipment, and engineering non-critical structural parts. 304 stainless steel is of course better in many aspects. But high manganese steel still has  advantages, as long as it is produced by a regular manufacturer.

At present, the national standards do not clearly define the grade of stainless steel materials for containers or tools for food. This means that electric kettles made of non-304 stainless steel are not substandard products.


Food-grade stainless steel refers to the stainless steel material that complies with the “National Standard of the People’s Republic of China/Sanitary Standard for Stainless Steel Tableware Containers” GB 9684-88, and its lead and chromium content is much lower than that of ordinary stainless steel.

All kinds of food storage containers and food processing machinery should use austenitic stainless steel (1Cr18Ni9Ti, 0Cr19Ni9, 1Cr18Ni9). And all kinds of tableware should use martensitic stainless steel (0Cr13, 1Cr13, 2Cr13, 3Cr13) should be selected.

How to improve the quality of large steel castings

The use of large steel castings is relatively common, such as mechanical equipment parts and precision steel castings on automobiles, which have relatively high quality requirements for products. In order to ensure the quality of these products, large steel castings manufacturers should control from a relatively basic process:

  1. According to the drawings provided, we should select the appropriate casting equipment. This basically guarantees the product quality of the steel castings. In the process of producing, solve the problems effectively, so as not to cause bigger losses.


  1. We should repair the surface in the first place if the product is defective in the process.



And then, what are the precautions in the process of producing large steel castings?

  1. Precautions for heat treatment of large steel castings

The strength level of large steel castings is close to the forged steel, with poor plasticity and resistance, uneven and not dense inside, large internal chemical composition error, poor thermal conductivity and messy structure. Therefore, it is necessary to pay special attention to eliminate internal stress and prevent cracking during heat treatment, but not necessary to take the harm of hydrogen into account. When formulating the heat treatment process, you can refer to the TTT curve, CCT curve and hardenability curve of the same steel grade. Meanwhile it is necessary to pay attention to the influence of uneven chemical composition, coarse grains and other casting defects.


  1. Partial heating phenomenon of large steel castings

There are many factors for partial heating phenomenon of large steel castings, mainly the following three types: 1) System overload, which is mainly manifested in excessive pressure or speed. 2) Oil outlet pipe is too thin, which leads to high oil flow rate and generates a lot of heat. 3) Poor cleanliness of the oil, which leads to increased internal wear, reduced volumetric efficiency, and oil leakage and throttling from the internal gap to generate heat.


  1. The reason of infiltration during the processing of large steel castings

Infiltration is actually a method of porosity treatment, especially micropores which can not be seen with naked eye. The appearance of micropores will cause leakage of the sealing medium, and increase the wear of the machining tool. Besides, micropores will also increase the cost, so that the quality of the product cannot be guaranteed. In the application process of the product, it will lose its function.

  1. Causes of subcutaneous pores in large steel castings

The generation of subcutaneous pores is a comprehensive reaction of improper operation of various links and procedures in the casting process. The reasons for the formation are complex and there are many influencing factors. We should pay attention to every operator and process involved.


In the casting process, the structure of large steel castings needs to be repaired for the parts after molding. There are many ways to repair the mold. 


  1. After the parts are moulded, there will be some places that are soft and not tight. Use a knife to loosen and use a tool to cram.
  2. The damaged part of the intersection of the two walls can be glued with sand with a knife, wiped to the gap and then smoothed.
  3. Large pieces of sand can be repainted with muddy water to re-patch.
  4. If there is a groove in large area, you can dig out the part first, and then repair it.

How To Avoid Poor Quality Steel Casting During Heat Treatment?

The strength level of large steel castings is close to forged steel, but with poor plasticity and resistance. At the same time, large steel castings also have problems such as uneven and not dense inside, large internal chemical composition error, poor thermal conductivity and messy structure.

Therefore, it is necessary to pay special attention to eliminate internal stress and prevent cracking during heat treatment. However, there is no need to take the harm of hydrogen into account. When formulating the heat treatment process, you can refer to the TTT, CCT and hardenability curve of same steel grade. Meanwhile, we should also take the influence of uneven chemical composition, coarse grains and other casting defects into account.

Precautions for the heat treatment of large steel castings


  1. Suitable temperature adjustment.

Due to large volume and tonnage, large steel castings simply form large internal and external temperature differences and stress during heat treatment. Therefore, we should pay attention to its heating and cooling rate. This can largely reduce the temperature difference and stress of steel castings.

  1. To ensure excellent circulation of the furnace gas.

When installing the furnace, the casting should be placed on the horn of appropriate height. The placement of the horn should ensure excellent circulation of the furnace gas and prevent the deformation of the casting. For important large castings, a sketch of the furnace installation should be made to specify the technical requirements, and indicate the orientation of the thermocouple when drawing an external thermocouple.

  1.  It is necessary to stress relief after heat treatment.

Large-scale castings (except high-manganese steel) should relief stress after heat treatment, welding repair, correction, machining, and cutting riser waiting.

  1. After heat treatment, too many cuts are not allowed.

Yide casting has rich experience in heat treatment of casting, with 27 years’ experience. If you have any problem with iron casting, brass casting, or steel casting, or you are looking for an experienced casting manufacturer in China, please don’t hesitate to contact us for more details.

How To Detect The Large Gray Iron Castings?

The detection method of large gray iron castings

Quenching, the detection method of large gray iron castings, is generally divided into three stages: vapor, boiling and convective heat transfer.

When the hot gray iron casting is put into the quenching medium, the medium around the casting is immediately heated to the boiling point and vaporized. Thus forms a superheated steam film on the surface of the castings to separate the casting from the quenching medium.

Due to the poor thermal conductivity of the steam film, the casting surrounded mainly depends on radiation and steam conduction. At this point, the casting cools slowly until the steam film ruptures and disappears, entering into the boiling stage.

Due to the presence of carbon nanotube particles, the oil-based carbon nanotube fluid breaks the formed bubbles, reduces the time of vapor stage, and enables different parts of the grey iron cast to enter into the boiling stage almost simultaneously with a high cooling rate. In the low-temperature stage of the cooling process, the cooling rate is relatively low. This greatly reduces the transformation stress of the martensite structure and the quenching cracking and distortion rate of the workpiece.



For the reasons mentioned above, the hardness of the sample in the oil-carbon nanofluid is significantly greater than that in 30# engine oil.

The failure modes of the cavity surface layer are mainly thermal fatigue cracks. The working characteristics of the low-pressure casting mold are affected by thermocycling. After each liquid metal is formed, the mold cavity is cooled by water, steam, air and other media. The working state of the mold cavity is repeated heating and cooling. As a result, the surface metal of the mold cavity undergoes repeated thermal expansion and contraction. That is, repeating tensile and compressive stress, resulting in cracks on the surface of the mold cavity.

Therefore, hot die steel needs high thermal fatigue resistance. The main factors affecting the thermal fatigue resistance of steel are as below:

1. Thermal conductivity of steel

The high thermal conductivity of steel can reduce the heating of the metal on the surface of the mold. Thereby it can reduce the tendency of steel to thermal fatigue. It is generally believed that the thermal conductivity of steel is related to the carbon content. The higher the carbon content, the lower the thermal conductivity. Therefore, it is not appropriate to use high carbon steel for hot die steel. Generally, we chose medium carbon steel (Wc=0.3%~0.6%) in production. If the carbon content is too low, the hardness and strength of the steel will decrease.


2. The critical point of steel

The higher the critical point (Ac1) of steel, the lower the tendency of steel to thermal fatigue. Generally by adding alloying elements such as Cr, W, Si, etc. to increase the critical point of steel.


The test result is invalid for the following causes:

1. Improper installing of the sample on the test machine, or improper operation of the test machine.

2. The surface of the sample has casting defects or improper processing of the sample (such as transition fillet, surface roughness and unsatisfactory size, etc.).

3. the tensile sample breaks outside the gauge distance.

4. obvious casting defects on the tensile sample port.

In the above cases, we should re-sample on the same test block or from the same batch of poured test blocks and test again.


If you want to know more about grey iron casting, you are welcome to visit our Yide Casting factory – JM casting.

If you are looking for an excellent grey iron casting for automobile engine cylinders iron cast, gears gray iron cast, speed grey iron cast wheels, casting gray iron brake discs and iron cast grey casting drums, and grey cast iron large machine tool bases, forklift casting, pipe grey iron parts, manhole over grey cast iron, Yide casting is a good choice for your casting parts manufacturing, please feel free to contact us for more details.

What Is The Cooling Process of Stainless Steel Castings ?

Stainless steel castings are one of the products produced by Yide Casting all year-round. Yide Casting have been manufacturing all type of steel casting items in 27 years. For example, double burner stainless steel, cast steel river, cast steel swivel, stainless steel grill grates, cast steel plate, etc.

The knowledge about stainless steel castings is also our concern. We all know that in the completion of the casting, cooling is also a step that cannot be underestimated.

Here’s a brief introduction of the cooling process of stainless steel castings:

The temperature will change after pouring the liquid metal into the casting mold.

After the liquid metal is injected into the mold, the heat exchange follows. The continuous decreasing temperature of the liquid metal and the increasing temperature of the mold indicate it.

There is an intermediate layer between the mold and casting.

The heat transfer system during the cooling and solidification process contains the casting mold and the forming metal. However, practice has proved that the inner surface temperature of the  mold is different from the surface of the casting. That means there is an intermediate layer between the mold and casting.

The heat transfer system of the casting during the cooling and solidification process is unstable .

The formation of the intermediate layer owing to the shrinkage of the metal in all directions and the expansion of the mold after heating. May it’s because of the paint layer on the surface of the mold, or an intermediate layer that has both gaps and paint.

Therefore, the heat transfer system of the casting during the cooling and solidification process is unstable. And the system is composed of casting, intermediate layer and mold.



The intermediate layer is the key to control the heat exchange.

Both the cross-section of casting and mold are metal. So when the cooling of the casting and the heating of the mold is not very intense, the cross-section has similar temperature distribution rules or thermal resistance. Thus the intermediate layer between the casting and the mold has an important effect on the entire heat transfer system.

In the casting-intermediate-mold system, most of the temperature drops on the intermediate layer. This is the case when the surface of the metal coats with thick paint.

The characteristic of this type of heat transfer is that the temperature difference between the cross-section of casting and mold is smaller than that of the intermediate layer.

Therefore, it can be assumed that the temperature on the cross-section of casting and mold is actually evenly distributed. And the heat transfer process mainly depends on the thermophysical properties of the coating layer. This means the thermal resistance of the intermediate layer is the key to control the heat exchange.

Leading Steel Casting Supplier In China

At the end of the article,  I want to recommend Yide Casting manufacturer – with JM casting factory, covering an area of 20000 sqm, over 200 employees. JM casting is famous of quality and word of mouth, without promotions and marketing ways. Thus if you are looking for a casting factory, please don’t hesitate to contact us for more details.


How to Manufacture Quality Cast Steel

How to Manufacture Quality Cast Steel

As we all know, the price of the steel cast is higher than the iron casting. But why?

If cast iron vs stainless steel, the mechanical properties of stainless steel casting are higher than that of cast iron, but its casting performance is worse than that of cast iron. However, the manufacturing of cast steel is more difficult than cast iron, thus its cost is higher.

Stainless steel casting belongs to investment casting or precision casting, with a relatively high melting point, and the molten steel is easily oxidized, due to poor fluidity of molten steel and large shrinkage rate. From a practical perspective, stainless steel casting is suitable for casting of various types and alloys.

I will show you how to produce quality cast steel as follows.

1. Poor liquidity of the molten steel.

Firstly, due to the poor liquidity of the molten steel, the wall thickness of the steel castings should not be less than 8 mm, in order to prevent the cold shut and misrun.

2. Simple structure requirement.

The structure of pouring system strives to be simple, and the sectional dimension is larger than that of cast iron.

3. The requirement of Suitable Casting Temperature.

We should adopt dry casting or hot casting, and the casting temperature should be at 1520-1600 ℃.

The fluidity can be improved since the casting temperature is high with a large superheat, thus the liquid stays for a long time.

However, if the pouring temperature is too high, it will cause defects such as coarse grains, hot cracks, pores and sand burning. Therefore, the casting temperature of small, thin-walled and complex casting should be at the melting point +150 ℃; and of large, thick-walled casting +100 ℃.



We must take these measures to prevent the occurrence of shrinkage holes and cracks in stainless steel castings.

1. Making the wall thickness uniform, and avoid sharp and right-angle structures.

2. Adding sawdust to sand mold, and coke to the sand core.

3. Adopting hollow sand core and oil sand core to change the deformability and permeability of the sand mold and core.


Yide Casting is a leading casting foundry in China, with 27 years’ casting experience, provides casting & machining service for our casting customer. Here, we have a steel casting foundry partner, which we have cooperated for many years. Yide casting machines casting products, such as reel steel cast, cast steel plate, 6 inch steel caster wheels, burner stainless steel etc. If you are looking forward to a professional casting manufacturer, please don’t hesitate to contact us, and welcome to visit our JM casting factory in China.