Heat treatment—Tempering

Tempering is a heat treatment process that improves the mechanical properties (typically ductility and hardness) and relieves internal stresses of a steel. Tempering is usually performed after hardening, to reduce some of the excess hardness, and is done by heating the metal to some temperature below the critical point for a certain period of time, then allowing it to cool in still air. The exact temperature determines the amount of hardness removed, and depends on both the specific composition of the alloy and on the desired properties in the finished product. What are the Benefits of Tempering?1). It changes the physical properties of the material that help in other manufacturing steps like cold forging, welding, and machining.2). Tempering helps to relieve stress making the metal easier to weld or machine.3). Increases strength while making the material more flexible and ductile. Guokun Casting, of Baoding Hebei is an ISO 9001-2008 registered iron and steel foundry & supplier of high quality carbon steel, alloy steel, stainless steel, wear resistant steel castings, gray iron casting, ductile iron casting, protype castings and machhined castings used in Power, Mining, Transporation, Agricultural, Automobile, bus and truck parts, valves, oil & Gas steel castings, Pipe Fittings and Gear Industry. With a montly capacity of 10,000kgs and with more than 15 years of experience ensure the short delivery and the highest valued iron & steel casting parts.

Heat treatment—Annealing

Heat treatment—Annealing Annealing is a metal heat treatment process, which means slowly heating the metal to a certain temperature, holding it for a sufficient time, and then cooling it at an appropriate speed.The purpose is as follows:Reduce hardness and improve machinability;Reduce residual stress, stabilize size;Reduce deformation and crack tendency;Refine the grain, adjust the structure and eliminate the structural defects. To be precise, annealing is a heat treatment process for materials, including metallic materials and non-metallic materials. Baoding Guokun Machinery and Baoding Guokun Export and Import Trading Co., Ltd is the professional alloy casting foundry and trader of investment casting, water glass casting, silica sol casting and precision casting parts in low volume or large volume. If you have similar inquiry, please feel free to contact to get a competitive prices.

The Benefits of Heat Treatment

Heat tretament means that materials are heated, insulated and cooled in solid state to obtain the expeceted structure and mechanical properties.Heat treating can soften metal, to improve formability. It can make parts harder, to improve strength. Heat treating can improve wear resistance by hardening the material. Metals (including steel, titanium, inconel, and some copper alloys) can be hardened either on the surface (case hardening) or all the way through (through hardening), to make the material stronger, tougher, more durable and more resistant to wear. If any comments, please contact to talk about the heat treatment process.

Furan resin sand casting process

Why is the hard permeability of phenolurea resin self-hardening resin better than furan self-hardening resin sand? Because the curing process of phenol urea resin is a polymerization reaction, no small molecule water is produced during the curing process, and there is no problem of inconsistent curing speed inside and outside due to different volatilization speeds of moisture inside and outside the type.The curing process of furan self-hardening resin is In the polycondensation reaction, water is generated during the reaction.Because the evaporation rate of the water inside and outside the core is different, the curing speed of the inside and outside of the core is different, so its hardness and permeability are poor.This is also the reason why the curing speed of furan self-hardening resin sand is greatly affected by the relative humidity of the air. Precoated sand casting process is close to investment casting, suitable for small and medium metal casting parts, iron casting, steel casting, aluminum casting. Compared with other two sand casting methods, green sand molding process and resin sand molding process, the precoated sand castng is the most precision casting process with more casting accuracy and better surface finish. Please mail your inquiry to or

EN-GJL-150 or EN 1691 GG 15 grey cast iron

EN-GJL-150 or EN 1691 GG 15 grey cast ironEN-GJL-150 is one of grey cast iron in European standard EN 1561, it is also named as gray cast iron GG15 in standard DIN 1691 by Germany and Austria. The Grade is equivalent with grey iron GB/T 9439-1988 HT150, ASTM A 48, class 20, JIS G5501 FC15, NFA32-101 Ft.15D, BS1452 Gr.150, ISO/R185 Gr.15 in China and other countries. The chemical composition of GG15 gray cast iron is not standard. Baoding Guokun, the professional China casting foundry can adjust the chemical composition according to the production conditions, as long as we coouold meet the mechanical properties. EN 1691 GG 15 Mechanical properties:Tensile Strength: 150 Mpa minHardness: 150~200 Casting process for Gray iron GG15:Shell mold castingSand castingPrecoated sand castingGreen sand casting If you need custom grey iron castings for railway & train, auto parts, valve & piping, mining, heavy engineering, industrial engineering, engineering & construction, please contact to get the competitive prices.