ZG230-450 carbon steel castings

Metal: GB/T11352-2009 Carbon Steel Casting ZG230-450, old Chinese grade ZG25

Similar casting metal: ASTM A27 450-240, BS3100 AM2, DIN 1681 GS-45, JIS 5101 SC450

Process: Lost wax casting, investment casting

Heat treatment: Normalized or Annealing at 890-910 °C ; Tempering at 620-680 °C

Steel Castings Tags: Mild steel castings

Description

Baoding Guokun, with 25 years casting experience, can produce various mild steel investment casting for various industries. Lost wax investment casting process can produce complex parts that are near-net shape. The mild steel lost-wax casting parts manufactured by Baoding Guokun is with complex shapes, tight and accurate tolerances that have a standard of ISO 8062 CT9-10, fine surface finish 6.3-12.5 μm Ra, minimal machining to reduce time and cost and cost-effective. The low carbon steel lost wax investment casting parts produced by Guokun, usually service different industries, such as railroad casting, pump casting, valve casting, heavy truck casting parts, mining casting, power generation equipment parts, etc.

What’s mild steel?

Mild steel, also know as low carbon steel, has a carbon content of less than to 0.25%. And the carbon structural steel castings have good properties for various machining, forging and welding process. The annealed microstructure of low carbon steel consists of ferrite and a small amount of pearlite, with lower tensile strength, softness and hardness, and better plasticity and toughness. Most low carbon steel are used for engineering structural components without heat treatment. But Baoding Guokun can produce the wear resistant mechanical parts in mild steel with carburizing or other heat treatments.

GB/T 11352: Carbon steel castings for general engineering purpose. This standard was formulated on the basis of revision of international standards ISO 3755:1991 ” Cast Carbon Steels for General Engineering Purposes” and ISO 4990:2003 ” Steel Castings-General technical delivery requirements, MOD”. Baoding Guokun listed the chemical composition and mechanical properties of ZG200-400, ZG230-450, ZG270-500, ZG310-570, ZG340-640 as follows:

chemical composition and mechanical properties of GB/T 11352-2009

Baoding Guokun Investment casting process steps for mild steel casting parts or low carbon steel casting components:

No.	Steps	Details
1	Patterns Makings	Creating a wax mold of the desired stainless steel pump impellers, and then adding sprues to the wax model to create a tree-like structure.
2	Shell Building	Coating the wax pattern with a layer of fire-resistant paint, and then to be sprinkled with sand, so after a period of hardening, the surface will form a layer of fire-resistant thin shell.
3	Dewaxing	Removing the wax, the shell is placed into an oven, melting the wax so that it can run out of the shell.
4	Pouring	Pouring the molten carbon steel into the shell, and waiting for solidification under room temperature.
5	Post treatment	After cooling, knock the shell and cut the sprue gate by grinding machinery to achieve net shape impeller castings. Then shot blasting to move mill scales to assure the smooth casting surface.
6	Machining	CNC Machining