Synthetic Graphite for Exothermic Welding Molds

SHJ synthetic graphite production refers to isostatic graphite, extruded graphite, die-molded graphite, and vibration graphite.

Synthetic graphite block’s Excellent Thermal Conductivity, High Temperature Resistance, High Melting Point, and Low Reactivity with Molten Metals Make it Widely Used in Exothermic Welding Moulds.

Synthetic Graphite Used To Process Exothermic Welding Molds

Exothermic welding, also referred to as aluminothermic welding, welds metal by utilizing the heat produced from the exothermic reaction between metal oxides and aluminum.

The thermal shock resistance of graphite material is crucial since the temperature within the inner cavity of the graphite mold swiftly rises to over 2,000 degrees Celsius during the aluminum thermal reaction.

Specialty graphite find widespread use in producing exothermic welding molds due to their outstanding thermal conductivity, high-temperature resistance, high melting point, and low reactivity with molten metal.

During the exothermic welding process, a chemical reaction occurs between the welding powder and the metal being welded, resulting in substantial heat generation. Graphite Block‘s exceptionally high thermal conductivity enables rapid heat transfer, swiftly heating the mold and melting the powder and metal. The molten metal then fills the mold cavity and solidifies, creating a robust joint.

graphite mold for exothermic welding

Specialty Graphite has a low coefficient of thermal expansion, which means that they do not expand or contract significantly at high temperatures. This property helps these materials maintain their shape and size during the welding process. Graphite materials are easy to work with and can be machined into molds of various shapes and sizes, which makes them ideal for exothermic welding.

SHJ graphite blocks with low thermal expansion coefficient and high thermal shock resistance. By using SHJ fine particle or medium particle graphite material to process the exothermal welding mold, the service life of the mold can be significantly improved.

As a synthetic graphite manufacturer, our technical department has compiled a reference database combining self-test data from independent laboratories and accumulated user feedback data. According to our experience and the specific industry needs of our customers, we will choose cost-effective raw materials to provide better service to our customers.

Medium Grain Graphite

Regular Size(Mm):

Block: 500 x 500 x (1800/1850),650 x (500/600) x (1800/1850/2200),800 x 500 x 1850,950 x 500 x 1850,1100 x 400 x 2200,1250 x 450 x 2200

Rods: Dia 400mm, Dia 440mm, Dia 500mm and Dia 600mm, length 1800~2100mm

Rounds Dia 700mm, Dia 800mm, Dia 900mm, Dia 1000mm, Dia 1100mm …….. D 2100mm, length 350mm

vibration graphite block

Grade		MV-12	MV-13	MV-20	ME-11
Type of Forming	Unit	Vibro-molded	Vibro-molded	Vibro-molded	Extruded
Bulk Density	g/cm3	1.72	1.73	1.65	1.73
Specific Resistance	μΩ.m	9	8.5	11	8
Compressive Strength	MPa	30	35	28	37
Flexural Strength	MPa	13	15	9	18
C.T.E. (RT-600°C)	10-6/℃	3.2	3.3	N/A	2.4
Thermal Conductivity	W/(m.k)	100	130	N/A	N/A
Ash Content	%	0.2	0.12	0.25	0.2
Maximum Grain Size	mm	0.8	0.8	2	0.8

Fine Grain Graphite

Grade	Bulk Density	Specific Resistance	Flexural Strength	Compressive Strength	Ash (Normal Grade)	Ash (Purified)	Grain Size	Regular size
Grade	g/cm³	μΩ.m	MPa	MPa	ppm	ppm	μm	mm
FM-12	1.76	9~10	40	65	500	50	13-15	550410250610510250910310310
FM-13	1.86	9~10	45	85	500	50	13-15	550410250610510250910310310
FM-22	1.81	9~13	38	75	1000	N/A	25	260250170
IS-14	1.86	11~12	65	135	500	50	5	1200×640×2701600×670×300
IS-41	1.78	15	65	130	200	N/A	10	620520260900570260
IS-42	1.78	14	55	110	200	N/A	13-15	510310250620520250740740230

*The above are representative characteristic values, not guaranteed values. Other products with different characteristics and dimensions are available for selection.