Tempering Furnace

Therm process Engineering Pvt. Ltd. designs and manufactures tempering furnaces for hardened steel components and bars. Tempering reheats hardened steel to a controlled temperature below the critical range. This reduces brittleness and internal stress and sets the final balance of hardness and toughness. Therm process supplies batch tempering capability through its hardening and tempering (universal) and bright annealing furnaces. It also supplies continuous tempering through electrically heated roller hearth furnaces, with a reference unit running at 650-800°C and 750 kg/hr. Share your part or bar details for a recommendation.

What Is a Tempering Furnace?

A tempering furnace heats previously hardened steel to a sub-critical temperature, holds it for a set time, and allows it to cool. After quenching, steel has a hard but brittle martensitic structure with high residual stress. Tempering relieves that stress and trades a small amount of hardness for a large gain in toughness.

The tempering temperature is the main control lever. Lower temperatures keep more hardness, while higher temperatures give more toughness and ductility. Small deviations change the final properties, so tempering furnaces must hold temperature accurately and uniformly across the whole load.

Tempering can be done in batch furnaces for mixed components, or in continuous furnaces such as roller hearth lines for high volumes of bars or tubes, where every piece gets the same cycle.

Therm process Tempering Furnaces

Therm process offers tempering capability in three forms:

Continuous roller hearth tempering furnace. This is an electrically heated line for bars. The reference installation tempers martensitic stainless steel and low alloy steel bars of about 5-25 mm diameter and 4-5 m length. It runs at 750 kg/hr and an operating temperature of 650-800°C.

Hardening and tempering (universal) furnaces. These batch furnaces are used across engineering industries and for forging heat treatment. They are custom designed to the customer's components and specification.

Bright annealing furnaces. These are also commonly used for tempering automobile parts where a clean surface finish is needed. They are available electrically heated, LDO fired or gas fired, from 300 kg to 3 tons per charge.

Therm process selects the configuration according to part geometry, volume and surface finish requirement

Technical Specifications

Key Features

• Batch and continuous options under one supplier.
• Electric continuous tempering for close temperature control.
• Clean-finish tempering option via bright annealing furnaces.
• Custom-designed chambers for components and forgings.
• Uniform heating for consistent hardness across the load.

How Tempering Works

• Loading Hardened parts are loaded in batches, or bars are fed onto the roller table.
• Heating The load is brought to tempering temperature at a controlled rate.
• Soaking It is held for the time required by grade and section.
• Cooling It cools in air or as specified.
• Testing Hardness is checked to confirm the target range.

Applications

• Tempering after hardening of engineering components.
• Continuous tempering of stainless and alloy steel bars.
• Tempering of automobile parts with a clean finish.
• Tempering of forgings after quench.
• Stress relieving at sub-critical temperature.

Industries Served

• Bright bar and bar processing
• Automotive components
• Forging
• General engineering and heat treatment shops

Benefits

• Predictable final properties through accurate temperature control.
• Reduced cracking risk in service.
• High throughput with continuous lines.
• Clean parts with bright tempering options.

Custom Tempering Furnace Solutions

Share the following:

• Material and hardness target
• Part or bar dimensions
• Throughput (kg/hr or batch weight)
• Tempering temperature and time
• Surface finish requirement
• Heating preference
• Batch or continuous operation

Why Choose Thermprocess?

• Since 1997, Mumbai.
• Continuous and batch tempering experience.
• Complete heat treatment range for hardening, annealing and tempering.
• ISO 9001 & ISO 14001 certified, as stated by the company.

Related Therm process Products

• Hardening Furnace
• Roller Hearth Furnace
• Bright Annealing Furnace
• Bogie Hearth Furnace
• Box / Muffle Furnace

Frequently Asked Questions