• img1
  • img2
  • img3

+86-510-83233269

maojing@wuxiacp.com

Product Categories

Contact Us

Add: No.8 Huicheng Avenue, Xizhang Village, Qianqiao Town, Wuxi City, Jiangsu, China

Contact: Daisy Mao

Tel: +86-510-83233269

Fax: +86-510-83233699

E-mail: maojing@wuxiacp.com

The purpose of heat treating carbon steel
Wuxi Qianqiao Strip Steel Co.,Ltd | Updated: Aug 14, 2017

The purpose of heat treating carbon steel is to change the mechanical properties of steel, usually ductility, hardness, yield strength, or impact resistance. Note that the electrical and thermal conductivity are only slightly altered. As with most strengthening techniques for steel, Young's modulus (elasticity) is unaffected. All treatments of steel trade ductility for increased strength and vice versa. Iron has a higher solubility for carbon in the austenite phase; therefore all heat treatments, except spheroidizing and process annealing, start by heating the steel to a temperature at which the austenitic phase can exist. The steel is then quenched (heat drawn out) at a moderate to low rate allowing carbon to diffuse out of the austenite forming iron-carbide (cementite) to precipitate leaving ferrite, or at a high rate, trapping the carbon within the iron thus forming martensite. The rate at which the steel is cooled through the eutectoid temperature (about 727°C) affects the rate at which carbon diffuses out of austenite and forms cementite. Generally speaking, cooling swiftly will leave iron carbide finely dispersed and produce a fine grained pearlite and cooling slowly will give a coarser pearlite. Cooling a hypoeutectoid steel (less than 0.77 wt% C) results in a lamellar-pearlitic structure of iron carbide layers with α-ferrite (nearly pure iron) between. If it is hypereutectoid steel (more than 0.77 wt% C) then the structure is full pearlite with small grains (larger than the pearlite lamella) of cementite formed on the grain boundaries. A eutectoid steel (0.77% carbon) will have a pearlite structure throughout the grains with no cementite at the boundaries.

Contact Us
Wuxi Qianqiao Strip Steel Co.,Ltd

Address: No.8 Huicheng Avenue, Xizhang Village, Qianqiao Town, Wuxi City, Jiangsu, China

Tel: +86-510-83233269

Fax: +86-510-83233699

E-mail: maojing@wuxiacp.com

Copyright © Wuxi Qianqiao Strip Steel Co.,Ltd All Rights Reserved.
foottop