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Generally, my country's national standards also stipulate that high manganese steel castings must be treated with water toughness not less than 1040℃, and the chemical composition is a mandatory item(aluminum oxide blast media suppliers turkey). In addition, the manufacturer can choose metallographic inspection and mechanical properties according to the detection ability or negotiate with the buyer(aluminium oxide suppliers). 

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For castings with thick wall and complex structure, low carbon content shall be selected, and w (c) shall be controlled between 0.9% ~ 1.1%(aluminum oxide blast media suppliers turkey). One of the inspection and the bending inspection is a mandatory inspection item for the product acceptance(glass bead abrasive). The metallographic inspection of high manganese steel castings refers to the national standard for metallographic casting of high manganese steel (GB/T 13925-1992).

The chemical composition of high manganese steel as a wear-resistant material is roughly: w(C)=0.9 %~1.5%, w(Mn)-10%~15%, w(Si)=0.3%~1.0%, w(S)≤0.05%, w(P)≤0.10%(aluminium oxide grit suppliers). When the carbon content is high, the solid solution temperature must be increased or the solid solution time must be extended, but it will lead to the grain growth(aluminum oxide blast media suppliers turkey). When the carbon content is low, it enters zone II and martensite appears. 

On the contrary(silicon carbide abrasive grit), the structure of high manganese steel in use is austenite, which has good toughness and work hardening ability(aluminum oxide blast media suppliers turkey). The standard specifies the chemical composition of high manganese steel castings and the minimum temperature (1000°C) for toughening treatment, and does not specify mechanical properties(steel shot abrasive). High manganese steel has a higher carbon content, and w(C) varies in the range of 0.9% to 1.5%.

The artificial aging treatment of ultra-high manganese steel (or high manganese steel) after solid solution can make the carbides be dispersed and distributed on the austenite matrix in the form of fine particles(abrasive blasting grit), and increase the wear resistance of these steels under grinding conditions(aluminum oxide blast media suppliers turkey). The main content of the American ASTM austenitic high manganese steel casting standard (ASTMA128/A128M-1993) is shown in Table 2-3.

In addition to the detailed introduction of manganese steel(brown aluminum oxide blast media), we will also introduce multi-element low-alloy wear-resistant steel, medium-chromium alloy all-attached grinding steel, high-chromium alloy wear-resistant steel and high-alloy heat-resistant wear-resistant steel(aluminum oxide blast media suppliers turkey). High manganese steel castings working under strong impact conditions also require higher manganese content, which is determined by the stress conditions of materials.

Different structures can be formed in the steel with different carbon and manganese contents(aluminum oxide suppliers usa). The figure shows the effect of structure after solution treatment(aluminum oxide blast media suppliers turkey). When the carbon content is high, it enters into zone III, and the as-cast carbides cannot be completely eliminated after solution treatment, and the steel will become brittle(aluminium oxide abrasive powder). With the deepening of research work, its chemical composition gradually stabilized.

Therefore, in the as-cast state, the strength and hardness of steel increase with the increase of carbon content, but the toughness and plasticity decrease with the increase of carbon content, especially when w(C) reaches more than 1.3%, the toughness and plasticity approach zero(aluminium oxide blasting media). The effect of carbon on the mechanical properties of high manganese steel as-cast and after solution treatment is shown in the table(aluminum oxide blast media suppliers turkey).

This is because when w(C) increases to more than 1.3%, continuous network carbides appear in the as-cast structure, causing the grain boundaries to be surrounded by brittle phases(aluminium oxide suppliers south africa), which greatly weakens the strength of the intergranular, thereby reducing the toughness and plasticity of the steel(aluminum oxide blast media suppliers turkey). In terms of mechanical properties, it shows that the strength increases and the plasticity and toughness decreases.

The performance of the solution treated steel has been greatly improved(70 grit aluminum oxide blast media). The austenite structure is obtained by water drop at 1050 ℃, which makes the strength of the steel, Plasticity and toughness have been improved, especially toughness(aluminum oxide blast media suppliers turkey). The solution treatment is to dissolve and homogenize carbides in austenite(garnet blasting media). It can enrich in the compressive stress zone around the dislocation and form a Coriolis gas mass.

Because manganese is an overheating sensitive element, the grain is easier to grow than other alloy steels at high temperature, and the coarse grain will inevitably lead to the reduction of toughness(aluminum oxide blast media canada). The interaction between carbon atoms and dislocations hinders the movement of dislocations(aluminum oxide blast media suppliers turkey). It is applicable to the working conditions of large impact, high stress and hard materials, such as crusher wear parts, railway turnout, etc.

This high-carbon martensite is a hard brittle phase, making the steel brittle(aluminum oxide blast media suppliers turkey). Carbon is dissolved in austenite as a solute atom, and the atomic radius of carbon is less than that of iron and manganese(white corundum abrasive), Therefore, the solid solution of carbon is not displacement solid solution, but interstitial solid solution(black silicon carbide). The main content of my country's national standard for high manganese steel castings (GB/T5680-1998) is shown in the table.

High manganese steel castings working under strong impact load usually require w (c) to be controlled within 1.25%, and individual working conditions require w (c) to be controlled within 0.9% ~ 1.5%(refractory materials). By properly reducing the carbon content, a single austenite structure can be obtained after solution treatment, so that the steel has good plasticity and toughness and is easy to work hardening(aluminum oxide blast media suppliers turkey).

Carbon has three main functions in high manganese steel(120 grit aluminum oxide): first, carbon is a strong expanding austenite element, and high carbon content is to obtain a single austenite structure after solution treatment(aluminum oxide blast media suppliers turkey); Second, carbon belongs to interstitial solid solution element, which causes character distortion and round solution strengthening effect is very obvious(aluminium oxide for blasting); Third, improve the wear resistance of steel. 

When the carbon content of high manganese steel castings is high, the casting fluidity is good, but the requirements for its heat treatment process are high(silicon carbide powder). Most of manganese in steel is dissolved in austenite, forming displacement solid solution and a small amount of (FeMn); C-type carbide(aluminum oxide blast media suppliers turkey). Generally speaking, as the carbon content increases, the abrasion resistance increases. Zone I is a single austenite structure.

Increase the water toughening treatment temperature and prolong the holding time, so that the carbides can be fully dissolved and uniformly solid dissolved(100 grit aluminum oxide blast media). In the production process of high manganese steel castings, the wall thickness and structural complexity of castings should also be considered(white corundum sand). Manganese can expand the phase zone in steel and is the main element to stabilize austenite(aluminum oxide blast media suppliers turkey). 

Both manganese and carbon can improve the stability of austenite, promote the steel to obtain austenite structure and improve the toughness of the steel(black corundum). When the carbon content in steel is constant, the microstructure of steel changes from pearlite martensite austenite with the increase of manganese content(aluminum oxide blast media suppliers turkey). When high manganese steel was first developed successfully, its composition changed in a wide range.