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Production of Open Die Forging Auto Parts Forging Parts Used in Mining and Construction Machinery

Defect analysis of Open Die Forging Auto Parts Forging Parts Used in Mining and Construction Machinery
(1) Oxidation
The phenomenon in which the metal billet reacts with the oxidizing gas in the furnace to form oxides when heated is called oxidation. The production of oxide scale not only causes metal burning loss, but also reduces the surface quality and dimensional accuracy of forgings. When the oxide scale is pressed into the forging to a depth exceeding the machining allowance, the forging can be scrapped.
(2) Decarbonization
The phenomenon that the carbon on the surface of the metal billet reacts with oxygen and other media during heating, resulting in the reduction of carbon elements on the surface is called decarburization. Decarburization will reduce the hardness of the surface layer and reduce the wear resistance. If the thickness of the decarburized layer is less than the machining allowance, it will not cause harm to the forging; otherwise, it will affect the quality of the forging. Decarburization can be slowed down by rapid heating, applying protective paint on the surface of the billet, and heating in a neutral or reducing medium.
(3) Overheating
The phenomenon of coarse grains of metal billets caused by too high heating temperature or too long holding time at high temperature is called overheating. Overheating will reduce the plasticity of the blank and the mechanical properties of the forging. To this end, the heating temperature should be strictly controlled, and the holding time in the high temperature stage should be shortened as much as possible to prevent overheating.
(4) Overburning
The heating temperature of the metal billet exceeds the initial forging temperature too much, and the phenomenon of oxidation and melting of the grain boundary is called overburning. After over-burning, the strength of the material is seriously reduced, and the plasticity is very poor. Once forged, it will be broken into waste and cannot be saved. Therefore, it is necessary to strictly implement the correct operating practices.
(5) Crack
When heating large forgings, if the charging temperature is too high or the heating speed is too fast, the temperature difference between the core and the surface of the forging will be too large, resulting in excessive internal stress and cracks. Therefore, when heating large forgings, to prevent the furnace temperature from being too high and the heating speed being too fast, heat protection measures should generally be adopted.

Our workshop covers over 8000㎡, which include electric furnaces, die forgings machines, CNC machining center, heat treatment and all kinds of testing equipment. With these advanced facilities & instruments, we are able to supply the high quality castings and forgings to our customers, and make products meeting comprehensive inspection requirements on chemical composition, mechanical properties, non-destructive testing and high precise dimensional inspections.

Welcome to the Kingrail website. We're glad you stopped by and trust you will have a happy tour.

Kingrail is an international company offers diversified range of high-tech products and services and operates globally.

Core business is identified with three divisions:

1. High-end railway components – wheels, axles and wheelsets for high-speed applications, locomotives, passenger trains, trams and underground trains., rail road cars, light rail, street car, ballast vehicles, etc

2. Railway track materials: Tie plates, fishplates, clips, screw spikes, steel rails, etc

3. Forging and casting to drawings, for various applications such as power generation, oil and gas, offshore platforms, cement works, industrial plants, iron and steel production plants or shipbuilding.

Whether you need components or integrated systems, global tracking technology or performance analytics,Kingrail is always here at service for you!

Since 2002, we've been committed to having the world's highest standards in railroad wheel sets. But we don't set the standards; our customers do.

The hard and smart-working employees of Kingrail are dedicated to putting customers first. Over 200,000 squares of manufacturing space. We're armed with modern equipment, progressive production methods, and the confidence that comes with years of experience. We can take on any job. No matter what it is.

With roots deeply embedded in the railroad industry, we've grown to be a world-class supplier of customer satisfaction. From your first contact with us to the delivery of the product, we strive to make it easy for you. Kingrail staff are happy and pride working here because they love and happy for the job, care and happy for all the job they do.

So feel free to put us to the test – with something easy, or better yet, with something impossible. We're ready to show you what we can do.

Maanshan Kingrail Technology Co.,Ltd. is pleased to introduce ourselves as one of the leading manufacturer, stockist and supplies of Railcar spares and Railway Track Materials, Railway equipment, forging and casting metal products!

Equipped with forging lines:3T electro-hydraulic Hammer,2500T Hot Die press,1600T Hot Die press,400T Double plate Friction press,300T Double plate Friction press, Kingrail also equipped with fully machining and inspection equipment, Main machining equipments:CNC Lathes,Painting line,Continuous Heat-treatment Line,well type Furnace,Cutting machine,Robots, Main testing equipments;OES Metals Analyzer,CMM,Universal hydrankic testing machine.

Invest about 8% of the sales volume to be the R&D expenses, Kingrail introduce the world's leading technology combined with international high-tech talent to ensure the stable development of the company,and maintain long-term competitive advantage.

Kingrail have exported products over 50 countries such as US, Canda, UK, South Africa, Kenya, India, etc. Competitve quality and service are spoken highly by worldwide customers!

Kingrail made strict rules on all products, customer service is customer core value! 

Our vision:

* To be best supplier with world-Leading Capacities!

* 100% customer satisfication!

We are not the best now, but we strive to be better and better!