What is the material of zg25 and what is the specific material of ZG35

ZG25 is a cast steel material, which refers to the steel used to make steel castings. When the strength requirements of the casting are high and the cast iron cannot meet the requirements, cast steel should be used. However, the fluidity of molten steel in cast steel is not as good as that of cast iron, so the thickness of the cast structure should not be too small, and the shape should not be too complex.

Controlling the silicon content at the upper limit improves the fluidity of the molten steel. According to the variety and use, cast steel can be divided into cast steel for general engineering, cast steel for welded structure, stainless steel cast steel, and heat-resistant steel cast.

Cast steel can be divided into cast alloy steel and cast carbon steel according to its chemical composition, and can also be divided into cast tool steel, cast special steel, cast and cast alloy steel for engineering and structure according to its use characteristics.

High manganese steel, alternative materials CR15MO3, CR15MOCU, CR28MO, low carbon martensitic steel,Duplex steel(m+f), bainite steel, etc.

It is usually carried out with a high-temperature trolley type electric furnace. Cracking in heat treatment is caused by excessive heating in the low temperature stage. Therefore, the correct operation is below 350, the heating rate < 80 h, below 750, < 100 h, and there are different periods of heat preservation.

At 750 hours, the casting is in a plastic state, and it can be heated up quickly.

to 1050 hours according to the thickness of the casting to determine the holding time (usually 1 hour 25mm); Then quickly rise to about 1100 and keep it warm for half an hour. The casting must be put into the water as soon as possible after it is baked, and the time from the furnace to the water should not exceed 45 seconds, and the winter time should be shorter.

Chemical Composition:

High manganese steel is divided into 5 grades according to the national standard, and the main difference is the carbon content, and its range is. High impact and low carbon content. The manganese content is between, generally not less than 13%. There is no national standard for ultra-high manganese steel, but the manganese content should be greater than 18%.

The level of silicon content has a great impact on the impact toughness, so the lower limit should be taken and not greater than that. Low phosphorus and low sulfur are the most basic requirements, because the high manganese content naturally plays a role in desulfurization, so phosphorus reduction is the most important, try to make phosphorus lower. Chromium is to improve the wear resistance, generally around the right.

The above content reference: Encyclopedia - high manganese steel.

The standard way to write No. 25 cast steel should be ZG25.

1. Cast steel is a general term for iron-based alloys used in the production of castings that do not undergo eutectic transformation during the solidification process. A type of cast alloy. Cast steel is divided into three categories: cast carbon steel, cast low alloy steel and cast special steel.

2. The mechanical properties of steel castings are not much different in all directions, which is superior to forged steel parts. Designers must consider the properties of materials in three directions when designing some high-tech products, which highlights the advantages of castings. Regardless of weight, volume, and quantity at one time, steel castings are easy to make complex shapes and non-stress-concentrated parts.

Manganese silicon steel. The commonly used manganese silicon steel grades in China include ZG30MNSI, ZG35MNSI, ZG35SIMNN, ZG50SIMNN, ZG20MNSI, etc., which can be used as train side frames, pillows, gears, wheels, etc. In order to reduce the tempering brittleness of manganese steel, molybdenum is often added.

ZG20MNMO and ZG50MNMO are commonly used in China.

Diversified manganese alloy cast steel China has ZG35SIMNMO, ZG35SIMNOV, ZG42MNMOV, etc., these steels can be used as excavator parts, components, large gears, crane sleeves, etc.

Adding a small amount of chromium to manganese-silicon steel (can improve hardenability, strength and wear resistance, and can make castings that are subject to impact and wear, such as gears, liners, etc.) The commonly used grades in China are ZG30CRMNSI and ZG35CRMNSI. However, this type of steel is prone to deformation and cracking when cast and heat treated.

ZG25i is a cast steel;

1. Its chemical composition is as follows: carbon content, manganese percent, sulfur percent, phosphorus percent, nickel percent, royal molybdenum percent, copper percent, and the rest are iron;

2. Cast steel is a kind of cast ferroalloy, which is a general term for iron-based alloys used to produce castings that do not undergo eutectic transformation during the solidification process. Cast steel is divided into three categories: cast carbon steel, cast low alloy steel and cast blind branch special steel;

3. The advantages of cast steel are greater design flexibility, the strongest flexibility and variability in metallurgical manufacturing, improved overall structural strength and a wide range of weight changes.

G35 is a commonly used cast steel material, which belongs to the Zhongshenchang refers to carbon steel. Its chemical composition is: carbon, tung silicon, manganese, phosphorus, sulfur, chromium, copper, nickel, molybdenum.

ZG35 material has high strength and wear resistance, and is suitable for manufacturing some parts that require high strength and wear resistance, such as machine tool bed, machine tool foot, gear, etc.

Medium carbon cast steel, ZG35 is the old standard before, equivalent to the current ZG270--500. Its carbon content is between, the new standard is not marked by carbon content, but by mechanical properties as the grade, 270 is the yield strength, 500 is the tensile strength, and the carbon content is not indicated.

The mechanical properties of ZG35 are slightly lower than those of structural steel or high-quality steel with the same carbon content, because it has a wide range of P and S content requirements.

ZG20SIMN is a low alloy cast steel:

ZG20SIMN cast steel has good casting properties and welding properties. It is generally used to cast large-section thick-walled heavy-duty castings, such as hydraulic press columns, working cylinders, hydro turbine runners, blades, power station spindles, flanges, sitting rings, etc., all high-toughness and easy-to-weld steel castings can be applied. The tensile fracture of the sample after positive tempering treatment often presents a stone-like fracture with low plastic toughness, which can be solved by changing to ferrotitanium deoxidation after the furnace as long as the quality of the charge is strictly controlled.

ZG20SIMN as-cast structure is pearlite and ferrite, which is easy to appear after normalizing, when the casting is seriously sticky, in order to facilitate sand removal, it can be annealed at a high temperature (1100) first.

Chemical composition: c ( carbon ) 0 12 ～ 0 . 22;

si ( silicon )0 60 ～ 0 . 80 ;

mn ( manganese )1 00 ～ 1 . 30;

p ( P ), s ( Sulfur ) 0 035;

Ni ( Nickel ) 0 40.

ZG logo cast steel meaning, 20 logo carbon content in about 20 ten-thousandths, Si and MN are alloying elements, this is a high-quality alloy steel, used for parts, as for the performance, because it is a casting, it is also related to the quality of casting, due to the addition of SI and MN elements, so it should be about the same performance as 20 steel, it should be better. It's best to check the materials manual.

Cast steel See GB T11352

Z (cast) G (steel) 250 (yield strength MPa)-485 (tensile strength MPa) can be used for valves, couplings, flywheels, etc., weldments in general.