Cranes usually short link chain (lifting chain) shape. It measures: d represents the diameter or size round iron; l represents the length of the inside of the section or call long; b represents the inside width. Material is generally made of steel material. When specifying the strength properties of steel using only these two materials, in addition to the combination of ingredients chemically related to external lifting chain where the best, but also with mechanical treatment and heat treatment related. By the numerous trials, we learned that with the molten steel made chain, when the diameter until 30cm, the chain of fine equal to the creator of the steel-making. Such as the chain diameter and then increase, it is to use more steel, as the result of steel to high temperature, while the expansion nor sensitive. Chain disadvantages. In terms of the chain of wire rope lifting chain when the material, it has the following disadvantages: overload and blow sensitivity greater elasticity is very small, while the situation is the sudden rupture produced. Since the chain friction phase of the Festival and the Festival office, a strong pattern. Due to the weight of the chain itself is very large lifting chain size, it can have a great inertia force, so when the speed winch mechanism is large, quite inappropriate. Application load and test load, the load can be divided into the following types. 1. Apply the load (or allowable load): this load of chain can often afford those. 2. Test load: this load of the whole chain during the test must bear the load. 3. The rupture load: Each chain shall be taken as a rupture test three sections, three-section test chain must be able to withstand the load. Tensile strength material we used a great relationship, but the minimum should be 35 kg / cm. In cross-section welding, usually 25-30% lower than the strength of the other throughout. High-intensity ring chain always wanted to understand the international standards of the chain of production, then the next we take a look at the different standards in different requirements for the chain of bars. (1) international standard specifications small ISO610-1990 chain, 30mm or larger size of the chain is not included in the standard. These large-sized chain of production has been widely used in the international arena and lifting chain, their production and acceptance is based on German DIN22252-2001 standards. Lifting chains (2) provides for international standards ISO610-1990 D grade chain (minimum breaking stress IO00MPa), Germany DIN22252-2001 standard no. (3) German standard DIN22252-2o01 for steel chains have specific provisions on the chain of plastic toughness Is0610-1990 index requirements above international standards. A variety of international standards for the chain, there are many different requirements, we will talk later described. Lifting chain price _ Chen of lifting chain (Online) _ lifting chain sling from Hebei chen Manufacturing Limited. Hebei chen sling Manufacturing Co., Ltd. (www.qzhon.com) Hebei Baoding, forestry machinery leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Chen led force in a sling with the staff warmly welcome all inquiries negotiations to create chen sling a better future.