Graphite Recarburizer Recarburizing Agent Carburetant Used for Casting: Grade, Form and Application Selection Guide

What Is a Graphite Recarburizer Recarburizing Agent Carburetant Used for Casting?

A recarburizer — also called a carburetant or recarburizing agent — is added to molten iron or steel to restore or raise the carbon content that is lost during the melting process. Carbon raisers fall into several broad categories: calcined petroleum coke (CPC), graphite petroleum coke (GPC), calcined anthracite coal (CAC), and natural graphite. Because natural graphite carries a higher price premium, it is generally not the first choice for volume steelmaking or casting; graphite petroleum coke, calcined petroleum coke, and calcined anthracite coal are more commonly selected for current steelmaking and casting processes.

Shijiazhuang nalai biotechnology Co., Ltd supplies a graphite recarburizer recarburizing agent carburetant used for casting under model designation Carburetant, with a headline fixed carbon specification of 98.5% minimum, low sulfur, and low ash (Ash 0.5% max), available in particle sizes from 0 to 40 mm. Multiple confirmed grades allow buyers to match the exact chemistry their process requires.

Grade Selection: Matching Fixed Carbon to Your Process

Fixed carbon (FC) content is the primary grade selector. Higher FC grades deliver a more predictable carbon yield and lower impurity pick-up. The following grade specifications are drawn from the confirmed product data provided by Shijiazhuang nalai biotechnology Co., Ltd.

FC-99: Fixed Carbon ≥ 99.0% | Ash ≤ 0.4% | Volatile ≤ 0.6% | Sulfur ≤ 0.4% | Moisture ≤ 1.0%

FC-97: Fixed Carbon ≥ 97.0% | Ash ≤ 1.8% | Volatile ≤ 1.2% | Sulfur ≤ 0.5% | Moisture ≤ 1.0%

FC-95: Fixed Carbon ≥ 95.0% | Ash ≤ 4.0% | Volatile ≤ 1.2% | Sulfur ≤ 0.2% | Moisture ≤ 1.0%

FC-93: Fixed Carbon ≥ 93.0% | Ash ≤ 6.0% | Volatile ≤ 1.5% | Sulfur ≤ 0.3% | Moisture ≤ 1.0%

FC-90: Fixed Carbon ≥ 90.0% | Ash ≤ 9.0% | Volatile ≤ 1.5% | Sulfur ≤ 0.3% | Moisture ≤ 1.0%

FC-85: Fixed Carbon ≥ 85.0% | Ash ≤ 13.0% | Volatile ≤ 2.0% | Sulfur ≤ 0.5% | Moisture ≤ 1.0%

Choosing Among the Grades

FC-99 and FC-97 are the highest-purity tiers. Their low ash and sulfur ceilings make them well suited for applications where melt cleanliness and precise carbon control are critical — for example, ductile iron or premium gray iron castings where sulfur pick-up would adversely affect microstructure.

FC-95 and FC-93 cover a cost-effective middle range. FC-95 carries a notably tight sulfur ceiling of 0.2%, making it relevant when sulfur is a more demanding constraint than ash. FC-93 tolerates slightly more ash but still limits sulfur to 0.3%.

FC-90 and FC-85 suit general-purpose steelmaking and gray iron applications where a wider ash tolerance is acceptable. Calcined anthracite coal typically falls in this range, with carbon content between 90% and 93% and sulfur between 0.3% and 0.5%.

Note: Price and delivery terms are not committed in this article. Contact Shijiazhuang nalai biotechnology Co., Ltd directly for commercial terms.

Particle Size and Physical Form

The confirmed specification covers particle sizes from 0 to 40 mm, with several sub-ranges.

• 0–1 mm: Natural size distribution; fast dissolution rate; suited to surface or supplemental additions.
• >1 mm to 4 mm: Particle size content at or above 90% in specified range.
• 4–10 mm: Particle size content at or above 90%; preferred for charge addition.
• >10 mm: Available for applications requiring coarser feed.

Particle size affects dissolution rate, absorption efficiency, and whether the material is suited for surface addition versus charge addition.

Fine grades (0–1 mm) dissolve faster but are more prone to oxidation loss if added in large quantities to the surface of molten iron. Coarser grades (4–10 mm and above) are best loaded with the scrap charge at the start of the melt, limiting oxidation exposure during the heat.

Furnace Type and Addition Method

Most graphite recarburizers are suited for electric furnace melting; a smaller number of recarburizers with a particularly fast absorption rate are used in cupola furnaces.

Electric Arc Furnace and Induction Furnace

For electric furnace smelting, the recommended approach is to load the carburetant together with the scrap charge at the start of the heat. Small supplemental additions can be made to the surface of molten iron after melt-down, but large surface additions should be avoided: excess surface addition can cause oxidation of the carbon and result in insufficient carbon content in the final casting.

Cupola Furnace

Only recarburizers confirmed as having a particularly fast absorption rate are indicated for cupola use. Buyers operating cupola furnaces should verify that the specific grade and particle size they select is suitable for cupola practice before committing to volume orders.

Application Fields

According to the confirmed product description, the graphite recarburizer recarburizing agent carburetant used for casting is applicable across the following sectors:

1. Steel Foundry — carburant, graphite electrode supplement, refractory material contexts.
2. Industrial and Friction Applications — brake pads, seal rings, friction plates, heat exchangers, lubricity applications.
3. Battery Production — alkaline battery cathode and lithium-ion battery cathode applications.
4. Metallurgy — casting for glass production, graphite crucibles, anodes for aluminium and titanium smelting industries.
5. Other Uses — glass sheet, pencil lead, clay bricks, conductive coatings.

For procurement teams focused on casting, the steel foundry and metallurgy categories above represent the primary use cases. Grades with tighter sulfur control — FC-95 at ≤ 0.2% S and FC-99 at ≤ 0.4% S — are particularly relevant where metallurgical quality requirements are stringent.

Packaging Information

Standard packaging is 25 kg or 50 kg per bag, with custom packaging available according to customer requirements. Trademark: NALAI. Origin: China. Stated production capacity: 2,000 tons per month.

Selection Checklist

When specifying a graphite recarburizer recarburizing agent carburetant used for casting, address the following factors before placing an order:

• Fixed Carbon Grade: Select from FC-85 to FC-99 based on casting quality tier and carbon yield target.
• Sulfur Tolerance: Choose FC-95 (S ≤ 0.2%) or FC-99 (S ≤ 0.4%) for the tightest sulfur control; FC-85 and FC-97 permit sulfur up to 0.5%.
• Ash Tolerance: FC-99 caps ash at 0.4%; FC-85 allows up to 13.0%. Select accordingly based on your process sensitivity to slag-forming constituents.
• Volatile Content: Relevant for induction furnace practice; lower volatile grades reduce gas evolution during melting.
• Particle Size: Use 0–1 mm for fast dissolution and surface addition; use 4–10 mm for charge addition in electric arc or induction furnaces.
• Furnace Compatibility: Confirm fast-absorption grade for cupola use; standard grades target electric furnace or induction furnace melting.
• Packaging Format: 25 kg or 50 kg bags; custom options available on request.

About Shijiazhuang nalai biotechnology Co., Ltd

Shijiazhuang nalai biotechnology Co., Ltd is a manufacturer specializing in graphite products, including graphite blocks, plates, rods, tubes, molds, crucibles, graphite paper, sealing products, graphite felt, carbon vanes, petroleum coke, and carburizing agents. The company combines production and export operations and offers customized product services. It supplies international customers across Europe, North America, South America, South Africa, the Middle East, and Southeast Asia.