aboutWhat is an atmosphere gas furnace?

Oxidation and decarburization occur during heat treatment in the air, so additional processing may be required. To avoid this, gastight atmosphere gas furnaces are often used to perform heat treatment by filling the atmosphere with gas, depending on the application, to prevent post-processing and reduce oxidation and decarburization of the products. The range of gases used can be from inert gases (Nitrogen, Argon) to hydrogen and AX gas, depending on the properties of the products and the purpose of heat treatment.
Sun Furnace Co., Ltd. a manufacturer of gastight atmosphere gas furnaces, can provide custom-made furnaces to meet customer requirements.



High gas tightness shall be achieved through a self-developed seal structure.

The specially designed structure prevents air infiltration into the furnace and gas extrusion from it. This seal structure can also handle special atmospheric gases.

a self-developed seal structure

Cost reduction can be achieved by reusing exhaust gas energy for preheating.

The atmosphere gas used in the furnace can be used to preheat the product, avoiding waste of heat. This results in energy savings through preheating of the product from room temperature.

Cost reduction

Total support including after sales follow-up

Sun Furnace Co., Ltd. can offer total support for design, manufacturing, installation and maintenance. Sun Furnace Co., Ltd. also select high-quality equipment such as heaters and thermocouples that can be used for a long time.


specificationSpecification of atmosphere gas furnace

Atmosphere Gas
Nitrogen / Hydrogen / Oxygen / Argon / Methanol cracking gas / Ammonia gas / Carbon monoxide / Carbon dioxide / AX gas / DX gas / RX gas
Purpose of heat treatment
Reduction / Oxidation / Vacuum displacement / Carburizing / Nitriding / Baking / Sintering / Degreasing / Normalizing
Treated Products
Steel / Non-ferrous metals / Glass / Brazing material
Transfer Method for Products
Batch type / Pit type / Bell type / Vertical type / Rotary retort type / Walking beam type / Snake chain type / Pusher type / Mesh belt type
Type of furnace
Reduction furnace / Carburizing furnace / Nitriding furnace / Carburizing-nitriding furnace / Non-oxidizing furnace / Brazing furnace

We welcome all inquiries and would be happy to hear from you about any other matters. Please don’t hesitate to contact us.

Sun Furnace Co.,Ltd., an industrial furnace manufacturer,
solves the problems of atmosphere gas furnace.

exampleExamples of Familiar products made
by atmosphere gas furnace

Parts for engine
Parts for engine
Maker pipe for catheter
Maker pipe for catheter
Glass for indicator tube
Glass for indicator tube
Parts for drivetrain
Parts for car air conditioner
Magnetic material
Parts for brake
Precision tube for conducting tester
Drive parts
Grindstone for electrical parts
Heat pipe for CPU

caseDelivery Examples

Sun Furnace Co., Ltd. can offer the optimum atmosphere gas furnace, including auxiliary equipment depending on the processing volume, products size, application, pre- and post-process, etc.


Batch type Reducing furnace

Effective length
Atmosphere Gas
Purpose of heat treatment
Products to be treated
Non-ferrous metal

Batch type Reducing furnace


Vertical type Reduction brazing furnace

Effective length
Atmosphere Gas
N2 / H2
Purpose of heat treatment
Products to be treated
Stainless steel

Vertical type Reduction brazing furnace


Bell type Nitriding furnace

Effective length
Atmosphere Gas
N2 / Ammonia gas
Purpose of heat treatment
Products to be treated
Stainless steel


Pit type Drip-injection carburizing furnace

Effective length
Atmosphere Gas
N2 / Methanol decomposition gas
Purpose of heat treatment
Products to be treated

Pit type Drip-injection carburizing furnace


Walking Beam type Encapsulation furnace

Effective length
Atmosphere Gas
Purpose of heat treatment
Products to be treated

Walking Beam type Encapsulation furnace

Other delivery cases
Batch type Atmosphere gas carburizing furnace
Rotary retort type Nitriding furnace
Roller hearth type Softening annealing furnace

problemWe have solved challenges like these:

We use a furnace that generates CO gas, which can pose risks during maintenance.
We need to replace the mixing fan shaft frequently due to wear, which causes gas leakage.
There is limited contact between the powder and reaction gas, resulting in longer processing times.

Case studies on issue resolution at unpublished sites
are also available for viewing.

introduction resultsHas been introduced to numerous customers.

For many years, we have been in business with a variety of industries, including the automotive, steel, and chemical industries. Our clientele spans from large corporations representing Japan to small and medium-sized enterprises located throughout Hokkaido in the north and Kyushu in the south.

  • IHI Machinery and Furnace Co., Ltd.
  • IWAKI DIECAST Co.,Ltd. Corporation.
  • Air Water East Japan Inc.
  • Air Water West Japan Inc.
  • Air Water NV Inc.
  • Air Water Plant & Engineering, Inc.
  • EPSON ATMIX Corporation
  • O-oka Corporation
  • CASTEM Co.,Ltd.
  • Nuclear Fuel Industries, Ltd.
  • Kobe Steel, Ltd.
  • Komatsu Ltd.
  • Sanken Sangyo Co., Ltd.
  • JFE Steel Corporation
  • JFE Chemical Corporation
  • JFE Pipe Fitting Mfg. Co., Ltd.
  • Shin-Etsu Chemical Co., Ltd.
  • Sumitomo Metal Mining Co., Ltd.
  • Sumitomo Electric Industries, Ltd.
  • Sumitomo Wiring Systems, Ltd.
  • Sumitomo Precision Products Co., Ltd.
  • Sumitomo Electric Sintered Alloy, Ltd.
  • Sumitomo Electric Fine Polymer, Inc.

  • Chuen Netsushori Giken Co.,Ltd.
  • DISCO Corporation
  • Tokyo Gas Engineering Solutions Corporation
  • TRIS Inc.
  • NAS Stainless Steel Strip MFG. Co., Ltd.
  • JGC Catalysts and Chemicals Ltd.
  • Powrex Corporation
  • Proterial, Ltd.
  • Honda Motor Co., Ltd.
  • Mitsui E&S Shipbuilding Co., Ltd.
  • MESCO, Inc.
  • Mitsubishi Electric Corporation
  • Enerdel,Inc.(USA)

reasonThe reasons why Sun Furnace Co., Ltd. is chosen.

Sun Furnace is a specialist manufacturer of industrial furnaces, having produced over 1,500 units since its inception. Our motto “tsuyomi” (strength and beauty) represents our commitment to prioritizing our customers’ needs above all else. With our unwavering dedication to craftsmanship, we strive to exceed our customers’ expectations and provide them with a sense of joy and excitement. Our wholehearted approach to craftsmanship enables us to deliver industrial furnaces that provide our customers with a sense of joy and excitement that exceeds their expectations.

Creating Together

Creating Together

For more than 40 years since its founding, Sun Furnace Co., Ltd. has not only realized “what we want to do,” but has also continuously considered “how we can make it better.”

Speedy Response and Reasonable Prices

Speedy Response and Reasonable Prices

Our experts in each field, such as sheet metal, casing fabrication, and refractories, utilize their wealth of experience and knowledge in their work.

Commitment to Manufacturing

Commitment to Manufacturing

Sun Furnace Co., Ltd. can design furnaces that meet US aerospace standards. The skilled people at Sun Furnace Co., Ltd. will not tolerate even the slightest errors, even if they are only a matter of millimeters.

flowFlow until the introduction

  1. Inquiry

    Please feel free to contact Sun Furnace Co., Ltd. for inquiries regarding furnaces, efficiency of the product handling system, and technical consultations.

  2. Confirmation of Requirements and Quotation Preparation

    Sun Furnace Co., Ltd. will submit a quotation in accordance with the customer’s requirements. The company may also accept tests using customer-supplied test samples, depending on the requirements. Sun Furnace Co., Ltd. may also provide a rough estimate at the consultation level, even if the requirements are not yet finalized.

  3. Detailed Discussion and Job Contract

    Sun Furnace Co., Ltd. will make a custom proposal based on the requirements, such as how to realize energy savings or improve the efficiency of pre- and post-processes with an automatic handling system.

  4. Manufacturing and Pre-Inspection

    Engineers from Sun Furnace Co., Ltd. will be on site to monitor the progress of the fabrication. The company will confirm all performance through inspections with the customer and in-house test runs before shipment.

  5. Delivery, Installation, and Test Run

    Sun Furnace Co., Ltd. will deliver the furnace to the customer site, assemble it, and conduct a trial run to check its operation.

  6. Follow-up after Service

    The engineers involved in the manufacturing of the furnace equipment will provide ongoing support for maintenance and servicing after installation at the customer’s site. Feel free to consult Sun Furnace Co., Ltd. about improvements, pre- and post-transfer processes, etc.

Q&AFrequently Asked Question

What is the difference from other furnace companies?
We can manufacture custom-made furnaces that are highly durable and easy to maintain. We are also good at automatic transportation considering the combination of pre- and post-processes, equipment, and transportation conditions. In addition, we have received high praise for the fact that our engineers consistently accompany you from ordering to delivery and maintenance.
The customer is considering a prototype test, but the test conditions have not been finalized by the customers.
We will listen to your requirements and respond if our equipment is suitable. Our motto is “together” and we always start by understanding the customer’s needs. Don’t hesitate to contact us for any consultation, including exams.Consultation for exams
Can Sun Furnace Co.,Ltd replace the parts such as heaters, muffle, and drive equipment in our existing equipment?
We believe that a long-term relationship with a customer begins after the equipment is delivered. We will help you with parts replacement, replacement work, maintenance, etc. due to aging deterioration. Also, if you have any problems with your equipment, please feel free to contact us.
The customer’s existing equipment is too old and the customer has no documentation on it.
Can Sun Furnace Co.Ltd. manufacture a similar furnace, without documentation ?
We will listen to the material to be processed, the temperature range to be used, the type of gas used for heat treatment, etc., and propose a new furnace that meets the customer’s needs.

If you need an atmosphere gas furnace,
please feel free to consult with us.