Our high-manganese steel forging materials including forging high-manganese steel (referred to as D.Mn13) and high-manganese steel forged alloy (commonly known as high manganese steel) into two categories.
High-manganese steel is applied over a hundred years of history of anti-wear steel, although the study of modern anti-wear metal fruitful, new anti-wear materials have emerged, in many applications, high-manganese steel is still can not be replaced by the other materials . Currently in the world of high manganese steel casting products accounted for 20% to 30% of the steel products.
Due to the limitations of casting process of casting high-manganese steel, the impact of the loose tissue, shrinkage, coarse grains and other casting defects are difficult to avoid, forming larger performance difference in different parts. There is a high manganese steel castings national standards GB/T5680-1998 in China. In the early 1990s, the high manganese steel pins have been applied in the locomotive vehicles by relevant sectors of Ministry of Railways, but by its impact on the limitations of the casting process, it can not meet application requirements because of mechanical properties of fluctuations in larger range, and lower average.
In 1997, we applied in Zhengzhou Railway Bureau, the “high-manganese steel forging electric locomotive pins, sets, boards’’ the research projects, through technical research and a lot of tests, and overcome some difficult to avoid casting defects, successfully developed the high manganese steel forging material. Its mechanical properties are greatly improved over the casting, it shows that the high manganese steel forging material with the overall performance in high wear resistance, high strength, high toughness High-manganese steel forging mechanical properties of materials are shown in Table I:
Tensile strength(σb); Yield strength(σs); Elongation(δ5);
≥880Mpa ≥350Mpa ≥40%
Reduction of(Ψ); Impact toughness(Aku);
≥35% ≥275 J/cm2
In 2002, my company in order to meet the mining machinery, engineering machinery, construction departments of railway successfully develop a high-manganese steel alloy forging, its mechanical properties is much larger than the high manganese steel forging, particularly prominent improvement in the impact toughness and wear resistance aspects. Properties of materials of forged alloy high-manganese steel mechanical shown in Table II below:
Tensile strength(σb); Yield strength(σs); Elongation(δ5);
≥1150Mpa ≥850Mpa ≥25%
Reduction of(Ψ); Impact toughness(Aku)
≥30% ≥175 J/cm2
Characteristics of high manganese steel forging products 22.1 high security Common parts made of metal materials in the moment often encountered strong force and pressure, is prone to stress concentration and fatigue damage and plowing wear and tear, resulting in surface cracks and the extension and expansion of a threat to the safety of equipment. High-manganese steel forging material with high strength, toughness, and elongation rate of 40% to 60%, tensile strength and yield strength ratio (yield ratio) is greater than 2, it can quickly create a high impact automatic transfer of stress, not prone to crack or spread, can effectively prevent part damage.
2.2 The high wear resistance High manganese in the larger impact load or contact stress, the hardening of its surface rapidly produce and have high density of dislocations and deformation twins have been generated, resulting in high wear-resistant surface layer, while still maintaining the inner good toughness. External shocks, the greater the load, the higher the wear resistance of its own surface, the surface hardened layer is worn, the outer load generated under the new work-hardening layer.
2.3 high-intensityProperties of materials of high-manganese steel mechanical in the present steel is very prominent, and its only drawback is the low yield strength after heat treatment, as shown in Table I above, which limits the application of high-manganese steel, while forging high-manganese steel alloy completely solved the problem, as noted in Table 2. For example, mining equipment used in the current pick, whether it is domestic and imported products, mostly for double-metal materials, complex process, difficult to control brazing quality, in use, the head cutter tooth wear too quickly lead alloy head and body tooth loss or poor performance in bending the body by the strong effect of bending or breaking. Use of high manganese steel forging manufacturing with overall style, with good toughness, wear resistance and impact resistance, wear and tear on the surface after the wear-resistant layers within the immediate new features, teeth in the work process synchronize the body and head wear and tear, to the best match, to avoid the traditional cut-off gear alloy head, body bent or broken tooth phenomenon.
2.4 self-lubricating At present, the use of high-manganese steel parts of the main applications of its outstanding wear resistance, and it has self-lubricating properties with less attention. In the use of high manganese steel material of the connecting pin sets do not add oil, particularly suitable for use in fill oil under difficult working conditions. For example, the key components of railway locomotive traction device sets is used by common alloy steel, Under the condition of the frequent shock in the operation, heavy loads, environmental conditions and difficult oil charge, it is easily often adhesive wear and strain, and it can not repair without disassembly, only by using cutting and other destructive means to break down, resulting in unsafe driving and wasting a lot of manpower and resources. Key components of the traction device made of high-manganese steel forging units, the problem is resolved and reduced operating costs.
2.5 The capability of be machined and welded The high wear resistance of high-manganese steel cutting it become a problem, once considered "non-processing of materials", heat eutectic carbide precipitation and the emergence of high-manganese steel material became "non-welded material." With the high-manganese steel forging material, its loose organization, shrinkage, coarse grains and other casting defects has been effectively controlled, as well as cutting tool materials, technology and advances in welding technology and materials continue to improve, so that high-manganese steel cutting machining and welding problems gradually resolved.
Compared high manganese steel forging produced by company and casting high-manganese steel products, its tensile strength, elongation, impact toughness and wear resistance are greatly improved, and the internal organization of the microscopic defects decrease and the density increase. High-manganese steel forging materials working under severe working, such as shock, frequent vibration, poor lubrication and deadly wear, it has shown its incomparable superiority of other materials, widely used in railway, mining, engineering machinery, electric power, metallurgy and other industrial and mining enterprises. Products based on high manganese steel materials in the field, adhere to the "generation of production, generation of research and development and idea generation" of technology development ideas, back from research institutions, universities and military enterprises rely on increasing self-development investment, establishment of an independent knowledge property rights system. With the expanding scale of production and to high-quality staff, high quality products and scientific management formed a special company based on the superior "good faith, the pursuit of innovation, customer satisfaction" business philosophy. It is widely accepted by the majority of users of all ages for its reliable quality and good after-sales service.