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Machines & equipment for sale

What is Tempering?

TemperingMetal

Tempering is a heat treatment process that consists of reheating hardened steel to a temperature below the lower critical temperature in order to decrease its hardness, improve its toughness, and remove internal stresses caused by the rapid cooling of steel. 

When is Tempering Used?

Tempering is used and necessary throughout many applications, and understanding when to use each method is important to guarantee desirable results for the metal.

  • When carbon steel is heated and then quenched rapidly, it becomes hard and brittle and tempering helps to restore its ductility. 
  • During the process of welding, metals end up having localized zones that are hardened because of the heat generated during the welding process- this can result in stress and hydrogen cracking. Tempering reduces the hardness and relieves the stress removing the unwanted mechanical properties.
  • Processes like rolling, drilling, punching, and bending lead to hardened materials with residual stress, tempering helps to alleviate this hardness.

Behind the Process of Tempering

  1. Iron-based alloy such as steel is subjected to extreme heat
  2. Steel is rapidly cooled- this process is called quenching
  3. After cooling, metal is very hard, lacking ductility *tempering is required
  4. Cooled metal is slowly re-heated at a constant temperature to achieve a balance of ductility and hardness required for the application needed

*For best results, it is best to carry out the tempering process immediately after the steel has been quench-hardened. This helps to avoid brittleness caused by quenching.

Benefits of Tempering

One of the most common benefits of tempering is to improve its toughness and hardness, but this process has many more advantages:

  • Tempering changes the physical properties of the material that help in other manufacturing steps like cold forging, welding and machining.
  • Tempering makes the metal easier to weld or machine by relieving stress
  • Increases strength while making the material more ductile and flexible
  • Overcome brittleness and increase toughness
  • Can increase magnetic and electrical properties of metals

3 Types of Tempering Process

Low Temperature: 100-200°C, internal stresses decrease brittleness and hardness is reduced.

Medium Temperature: 200-500°C, the hardness is decreased and there is an increase in toughness and ductility.

High Temperature: 500-700°C, hardness decreases and material becomes more machinable.

Common Application of Tempered Steel

  • Constructing buildings and bridges
  • Making gears
  • Liners for chutes, dump trucks and trailers
  • Building durable storage tanks
  • Deflector plates

Tempering Ovens for Sale/Tempering Furnaces for Sale

Riley Surface World has a range of ovens and furnaces that are suitable for tempering steel right across the temperature range. Within our catalogue of industrial ovens (up to heart... 650°C) and industrial furnaces (650°C +) should be a heat treatment solution. Alternatively, for smaller parts and components, try our Lab/Bench Top Ovens or Bench Top Furnaces.

Brand New
Custom Built Oven for Tier 1 Automotive Manufacturer
More Images Available

SNOL Custom Build Furnaces & Ovens

Custom built ovens and furnaces to meet your project requirements and standards.

Stock No
NEW079
Category
Industrial Ovens
Model
SNOL
Condition
Brand New
Availability:
Available subject to build time
Price [?]
Please call on +44 (0) 1922 45 8000
Special Offer
Almor Group E700 Electric Oven
More Images Available

Almor Group E700 Very Heavy Duty Electric High Temperature Air Circulated Heat Treatment Oven

Almor 48kW, 700°C, Industrial air circulated treatments oven. Vertical powered lifting door and twin internal air recirculation fans. Fitted with 2 Eurotherm controllers, one for temperature control and the other for overtemperature safety. Ideal for a range of applications, generally for treatments that require high temperature air circulation.

Stock No
OB2296
Category
Industrial Ovens
Model
Almor Group E700/12.12.12
Year of Manufacture
2008
Internal Size (WxDxH mm) [?]
1300 x 1450 x 1250
Max Temp
700°C
Other Info
Vertical Powered Uprising Door
Condition
From a working environment, Good Condition, Current Model
Refurbished Price [?]
£ 19,500 (+ VAT)
Special Price (refurbished) [?]
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Special Price (sold as seen) [?]
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Special offer ends
29 February 2024 15:00 GMT while stocks last
Special Offer
Airflow High Temperature, Large Capacity, Top Hat / Bell Oven
Video Available

Airflow Group High Temperature, Large Capacity, Top Hat / Bell Oven.

A high temperature 425°C gas fired Airflow oven with a unique lift off operation to give maximum possible access for loading and unloading. We can now offer a modification to this oven to fit double swing open doors to give access to the oven chamber without the need to lift the oven off the floor.

Stock No
OZ2110
Category
Industrial Ovens
Model
Airflow Group Top Hat/Bell Heat Treatment Oven
Year of Manufacture
2013
Internal Size (WxDxH mm) [?]
3020 x 2950 x 1830
Max Temp
425°C @ 4000Kgs load mass
Other Info
500 kw Comtherm Burner
Condition
From a working environment, Good Condition
Refurbished Price [?]
£ 21,750 (+ VAT)
Special Price (refurbished) [?]
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Special Price (sold as seen) [?]
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Special offer ends
29 February 2024 15:00 GMT while stocks last
Special Offer
Wellman Very Heavy Duty Electric Tempering Oven / Furnace
Video Available

Wellman Very Heavy Duty Electric Tempering Oven / Furnace

Wellman Electric Tempering Furnace with work envelope of 865 x 915 x 1525 mm approx. with a maximum temperature of 750°C degrees capable of tempering 1000 kgs. of material.

Stock No
OZ2131
Category
Industrial Ovens
Model
Wellman Front Loading Tempering Oven
Year of Manufacture
Rebricked
Internal Size (WxDxH mm) [?]
850 x 1350 x 830
Max Temp
750°C
Other Info
Load up to 1000 kg
Condition
From a working environment, Good Condition, Seen powered at RSW
Refurbished Price [?]
£ 12,750 (+ VAT)
Special Price (refurbished) [?]
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Special Price (sold as seen) [?]
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Special offer ends
29 February 2024 15:00 GMT while stocks last
Sold Subject to Contract
Wellman Electric Tempering Furnace
Video Available

Wellman Electric Tempering Furnace

Wellman Electric Heat Treatment Oven / Furnace with work envelope of 865 x 915 x 1525 mm approx. with a maximum temperature of 750°C degrees capable of loads 1000 kg's of material.

Stock No
OZ2133
Category
Industrial Ovens
Model
Wellman High temperature Industrial oven / Furnace
Year of Manufacture
Relined
Internal Size (WxDxH mm) [?]
865 x 915 x 1000
Max Temp
750°C
Other Info
Nominal load 1000 kg, Roller hearth bed.
Condition
Good Condition, Seen powered at RSW