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11 Carburising

Carburising and carbonitriding are surface hardening treatments that enhance the hardness of low carbon/low alloy steels by diffusing carbon and nitrogen, respectively. These processes utilize computer-controlled sealed-quench furnaces to ensure precise control over variables, resulting in minimal distortion and optimal mechanical properties. Commonly processed materials include various carbon steels, with turnaround times typically around three days for standard work.

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16 views1 page

11 Carburising

Carburising and carbonitriding are surface hardening treatments that enhance the hardness of low carbon/low alloy steels by diffusing carbon and nitrogen, respectively. These processes utilize computer-controlled sealed-quench furnaces to ensure precise control over variables, resulting in minimal distortion and optimal mechanical properties. Commonly processed materials include various carbon steels, with turnaround times typically around three days for standard work.

Uploaded by

Sunil Saini
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© © All Rights Reserved
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Carburising & Carbonitrding HTL Fact Sheet 11

Carburising is a surface hardening treatment in which carbon is diffused into the surface of a low carbon/low alloy steel. After
quenching the result is a part with high hardness on the surface, but with a softer, tough core underneath. Carbonitrding
is a very similar process but as well as diffusing carbon into the steel an addition of nitrogen is made at the same time.
Carbonitrding is generally used instead of Carburising for steels that have lower hardenability such as plain carbon steels and
mild steel.
Heat Treatments Carburises and Carbonitrides by the gaseous method using computer controlled sealed-quench furnaces.
Tight control of carbon concentration, diffusion rates, temperature and quench variables are required to process a component
with minimum distortion and achieve optimum mechanical properties. The controlled atmosphere sealed-quench furnace is a
well proven and respected method of producing high quality carburising.

Characteristics of Carburising and Carbonitrding


• Wide range of case depths possible. (0.1-2.5mm)
• Combination of wear resistance and ductility.
• Enhanced fatigue properties from high residual
compressive stresses.
• Ability to mask off areas that need to be left soft.
• No intergranular oxidation that is common with
Fluidised Bed and Pack Carburising processes.

Sealed Quench Furnace

Commonly Processed Materials


1020, 1040, Carbon Hollow Bar, E110, EN36A, EN39B, Mild Steel

Maximum Sizes

620 mm width x 950 mm length x 470 mm height

1,000 kg maximum load


Small gears jigged for Carbonitriding

Turnaround Times
Allow 3 days for general work. Extraordinarily large pieces or deep case depths may take longer. A faster turnaround can
be organised for urgent work.

116-118 Stoddard Road, Mt Roskill, PO Box 57025, Owairaka, Auckland 1041, New Zealand
Enquiries: Ph: +64 9 621 0020, Fax: +64 9 621 0019, Email: info@heat-treat.co.nz Web: www.heat-treat.co.nz

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