Thermal Treatments
What Is Thermal Treatment?
Thermal treatment is the process of heating and cooling metal in its solid state under specific conditions to alter its mechanical properties. While the chemical composition remains unchanged, the result is a hardened surface with a ductile core—ideal for durability and performance.
Why Is Thermal Treatment Important?
Many metal products require thermal treatment before use. These include bolts, bushings, and automotive steel components with simple geometries. The process enhances production efficiency and significantly improves product quality.
Our Infrastructure
We operate state-of-the-art furnaces with electronically controlled endothermic atmospheres (oxidation-free). Our systems include carbon percentage monitoring via oxygen sensors and time-controlled processes. Every step is tracked through computer systems, and process behavior graphs can be printed upon request.
Types of Thermal Treatments We Offer
Neutral Hardening
In neutral hardening, we use a nitrogen-rich atmosphere with small amounts of hydrocarbons—such as LP or natural gas (we use endothermic atmosphere). Once the part reaches austenitization, it is quenched in a severe medium like water, oil, or brine (we use oil). The hardening level depends on the carbon content and the transformation from austenite to martensite. The atmosphere must protect the surface from oxidation and prevent decarburization (carbon loss).
Carburizing
Carburizing is one of the oldest methods for surface hardening steel parts. The metal is exposed to a carbon-rich atmosphere, promoting absorption and diffusion of carbon into the surface. This process creates a hard outer layer while maintaining a softer core—ideal for wear resistance. The endothermic atmosphere protects the steel from oxidation and supplies sufficient carbon for surface enrichment. Once the desired carbon penetration is achieved, the part is quenched or normalized.
Carbonitriding
Carbonitriding is a gaseous surface-hardening process where steel is heated in an atmosphere that allows simultaneous absorption of carbon and nitrogen, forming an extremely hard surface layer. The atmosphere includes a carrier gas enriched with natural gas, methane, or propane (carbon source), and ammonia (nitrogen source). The diffusion occurs between 815°C and 870°C, followed by oil quenching to reduce distortion and cracking risk. Typical layer thickness ranges from 0.15 to 0.40 mm, achieved in ½ to 3 hours at 815°C.
Annealing
Annealing reduces internal stresses and softens steel for machining. The process involves heating the steel above its critical temperature (depending on the type) and allowing it to cool slowly in a closed furnace or insulated medium like ash, lime, or asbestos. Slow, uniform heating is essential, so we use furnaces with precise temperature control. If exact temperature measurement isn’t possible, we estimate based on material coloration during heating.
Why Choose Us?
With years of experience in the industrial manufacturing sector, we understand the unique challenges faced by our clients. Our commitment to quality, innovation, and customer satisfaction sets us apart in the fastener industry.
We continuously invest in research and development to enhance our product offerings and ensure that we remain at the forefront of technology and manufacturing processes. Our goal is to provide reliable solutions that help our clients succeed in their respective markets.
Frequently Asked Questions
What types of fasteners do you offer?
We offer a wide range of fasteners including nuts, bolts, washers, and specialty components designed for various industrial applications. Our products meet stringent quality standards and are suitable for both domestic and international markets.
How can I place an order?
To place an order, you can contact our sales team directly through the contact form on our website or call us at our customer support number. We will guide you through the ordering process and provide you with a quote based on your requirements.
What are your quality assurance practices?
We adhere to strict quality assurance practices to ensure that all our products meet industry standards and customer expectations.
Do you offer international shipping?
Yes, we offer international shipping options to cater to our global clientele. Please contact us for specific shipping details and rates based on your location.
What is your return policy?
Our return policy allows for returns within 30 days of purchase, provided the items are in their original condition. For more details, please refer to our return policy page or contact our customer support team for assistance.