Carbon Steel Castings

What is carbon steel casting?

Carbon steel castings (also known as carbon steel precision castings) are metal castings mainly composed of iron and carbon elements. Carbon steel is one of the main materials in the current cast steel industry. It has the advantages of low cost, high wear resistance, easy preparation, and can be heat treated to improve its strength, ductility and workability.

Classification of carbon steel

Mild Steel (<0.20%C):

It is also called mild steel due to its low strength, low hardness and softness.

Medium Carbon Steel (0.20 to 0.50% C):

It is the most widely used material at medium strength levels for a variety of applications. In addition to being used as a building material, it is also widely used in the manufacture of various mechanical parts.

High carbon steel (> 0.50% C):

After proper heat treatment or cold drawing hardening, high carbon steel has the advantages of high strength, high hardness, high elasticity and not easy to deform.

Advantages of carbon steel castings

Compared to other steels, carbon steel is used in the largest amount and is easily obtained by casting.

Carbon steel can achieve higher hardness and better wear resistance after heat treatment.

The hardness in the annealed state is very moderate and it has good machinability.

Raw materials for carbon steel are very common, readily available, and relatively inexpensive to produce.

Carbon Steel Casting Process

There are currently two processes for carbon steel castings: water glass investment casting or silica sol investment casting

Casting of water glass: adding water glass to the molding material (usually called silica sand) in a certain proportion, making it into "water glass sand" by stirring, rolling and mixing, then blowing it into the mold and filled with carbon dioxide gas, carbon dioxide and water sandbox. It undergoes a chemical reaction to form silica gel, which hardens the water glass sand, and is completed through the process of lifting, closing the box and pouring.

Silica Sol Investment Casting: This is a lost wax casting method. First, a mold is made according to the shape of the silica sol casting, and the wax mold is placed in a solution made of silica sol and quartz sand. There will be a layer of material on the wax mold, which will then solidify. After repeated soaking and curing, a mold shell is basically formed. Finally, it is dewaxed and cast.

Application of carbon steel castings

General mechanical parts: gears, connecting rods, engine covers, etc. Common hardware tools: wrenches, bucket teeth

Carbon Steel Casting Samples


What’s The Difference Between Carbon Steel And Cast Iron?

Carbon steel is an iron – carbon alloy with a carbon content of 0.0218% to 2.11%. Cast iron generally has a carbon content of 2.5% to 3.5%. Carbon steel castings has relatively good strength and toughness and is used to manufacture various mechanical parts and metal products. The properties of cast iron are lower than steel, especially the tensile strength and plasticity are low, and it cannot be forged, but its hardness and compressive strength are better.

Mild steel casting in carbon steel products

Mild steel refers to steel with 0.15 to 0.25 percent carbon and not many additional alloying components. Mild steel products are essential. More than half of the common carbon steel products are mild steel casting. Like some mild steel casting samples shown above, Dawang provides you with various mild steel products. Regarding mild steel cost, we will provide you with a satisfactory price. For more information, please consult our mild steel cost service.

What Are The Defects Of Carbon Steel Castings?

Carbon steel casting generally has the following defects:

1. Gas Porosity

The reason for the pores is that there is too much water in the molding material or a lot of gas – producing substances; the air permeability of molding sand and core sand is poor; the pouring speed is too fast.

2. Trachoma

The causes of blisters include insufficient molding sand strength; insufficient molding sand compactness; and too fast pouring speed.

3. Shrinkage

The cause of shrinkage cavity is poor feeding of the casting during solidification.

4. Sticky sand

The cause of sticky sand is the poor fire resistance of the molding sand or the high pouring temperature.

5. Cracks

The causes of the cracks are the large difference in the wall thickness of the castings; the improper setting of the gating system; the new difference between the sand mold and the core.

How To Distinguish Carbon Steel Casting Grades?

Carbon steel casting grades are divided into three subgroups according to the carbon content of the metal: Low carbon steel castings/Mild steels (up to 0.3% carbon), Medium carbon steel castings(0.3–0.6% carbon), and High carbon steel castings (more than 0.6% carbon).

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