At present, there are many die steel manufacturers in China, such as Dongte, Wu Shang, Great Wall, Wuyang, Taigang and Daye. Medium-sized forging plant in domestic forging industry, with both smelting and forging capabilities; Thirdly, some small forging industries in Hubei, Zhejiang, Jiangsu and other places have the ability to directly use die steel waste for smelting and forging in the production of intermediate frequency furnaces. High quality is some imported die steel. In East China and South China, there are several foreign brand agencies. Therefore, in view of the current production and sales situation of die steel in the market, buyers need to directly contact a first-class agent or a designated seller to buy it according to the technical requirements and die design requirements of their own products, from imported materials to domestic materials through proper channels. Moreover, you can directly find out whether it is a real product online and evaluate the characteristics of the product before using it. The die material is Jinhua Zhou die steel.
2. What is the standard for purchasing die steel?
At present, there are many domestic brands and international brands in the die steel market in China, which basically focus on several standards:
① Domestic die steel: GB/T1299—2000;
② Korean die steel: KSD 3753-1984;
③ Taiwan Province die steel: CNS2964—1992;
④ Japanese die steel: JISG 4401—2000;
⑤ American die steel: ASTM A686-1999;
⑥ German die steel: DIN
⑦ British die steel: BS 4659—1989;
(8) French die steel: NFA 35-590 (1992);
Pet-name ruby Russian die steel: ггoct 5950；;
Attending Swedish die steel: SS;
⑾ Italian die steel: UNL 2955-82.
3 What problems should be paid attention to when purchasing die steel?
The selection of die steel should be based on the production conditions and working environment of the die, combined with the basic performance related factors of die steel, which requires the die steel to be economical and reasonable and advanced in technology.
Therefore, we should pay attention to the following issues when purchasing:
Basic purchasing principles
Meet the requirements of working conditions
Wear resistance; Strong toughness; Fatigue fracture performance? (In the process of working, under the long-term action of cyclic stress, fatigue fracture often occurs. Its forms include low energy multiple impact fatigue fracture, tensile fatigue fracture, contact fatigue fracture and bending fatigue fracture. The fatigue fracture performance of die mainly depends on its strength, toughness, hardness and the content of inclusions in the material); High temperature performance (? When the working temperature of the die is higher than AG, the hardness and strength will decrease, leading to premature wear or plastic deformation of the die and failure. Therefore, the die material should have high tempering stability to ensure that the die has high hardness and strength at working temperature. ); Anti-cold fatigue? (Some molds are in the state of repeated heating and cooling during the working process, which makes the surface of the cavity under tension and pressure change stress, causing surface cracking and peeling, increasing friction, hindering plastic deformation and reducing dimensional accuracy, thus leading to mold failure. Cold and hot fatigue is one of the main failure forms of hot working dies, and this kind of dies should have high cold and hot fatigue resistance. ); Corrosion resistance? Some molds, such as plastic molds, have chlorine, fluorine and other elements in the plastic when they work. When heated, they decompose and separate out strong corrosive gases such as HCl and HF, which corrode the surface of mold cavity, increase its surface roughness and aggravate wear failure. )
Meet the requirements of process performance.
Mold manufacturing generally goes through several processes such as forging, cutting and heat treatment. In order to ensure the manufacturing quality of the mold and reduce the production cost, its material should have good ductility, machinability, hardening capacity, hardenability and grindability; It should also be less sensitive to oxidation and decarbonization, and have a tendency to crack due to quenching deformation.
Meet economic requirements
Reasonable cost performance, we must consider the principle of economy, as far as possible to reduce manufacturing costs. Therefore, under the premise of satisfying the service performance, materials with lower prices should be preferred, carbon steel can be used instead of alloy steel, and domestic materials can be used without imported materials. ? In addition, the production and supply of the market should also be considered when selecting materials, and the steel grades selected should be as few and concentrated as possible. In addition, the source of procurement needs to be considered.
Die steel can be divided into plastic die steel, cold-working die steel and hot-working die steel. Hot-working die steels include H 13, cold-working die steels Cr 12mov, Cr 12, SKD 1 1, D2, DC53, etc.
Actual manufacturing requirements at the time of procurement
(1) Bearing capacity and impact resistance;
(2) the working temperature of the mold;
③ Corrosion resistance;
④ the size of the mould;
⑤ Complexity of mold shape
⑥ Different parts of the mould have different use positions;
⑦ Number of processed products;
(eight) materials for processing products;
Pet-name ruby mold design requirements;
Attending the performance requirements of each working procedure and process in the mold manufacturing process.