Some Information of Heating Treatment Steel Strip

Steel strips in heating treatment mostly are narrow strips (from 10mm to 650mm).

Four methods can be used in this technology.

1.Quenching. Qquenching is the rapid cooling of a workpiece to obtain certain material properties. It prevents low-temperature processes, such as phase transformations, from occurring by only providing a narrow window of time in which the reaction is both thermodynamically favorable and kinetically accessible. For instance, it can reduce crystallinity and thereby increase toughness of both alloys and plastics (produced through polymerization).

2.Hardening. Hardening is a metallurgical and metalworking process used to increase the hardness of a metal. The hardness of a metal is directly proportional to the uniaxial yield stress at the location of the imposed strain. A harder metal will have a higher resistance to plastic deformation than a less hard metal.

3.Tempering. Tempering is a heat treatment technique for metals, alloys and glass. In steels, tempering is done to "toughen" the metal by transforming brittle martensite or bainite into a combination of ferrite and cementite or sometimes Tempered martensite. Precipitation hardening alloys, like many grades of aluminum and superalloys, are tempered to precipitate intermetallic particles which strengthen the metal. Tempering is accomplished by a controlled reheating of the work piece to a temperature below its lower critical temperature.

4.Annealing.In metallurgy and materials science, is a heat treatment wherein a material is altered, causing changes in its properties such as strength and hardness. It is a process that produces conditions by heating to above the recrystallization temperature, maintaining a suitable temperature, and then cooling. Annealing is used to induce ductility, soften material, relieve internal stresses, refine the structure by making it homogeneous, and improve cold working properties.
In the cases of copper, steel, silver, and brass, this process is performed by substantially heating the material (generally until glowing) for a while and allowing it to cool. Unlike ferrous metals-which must be cooled slowly to anneal-copper, silver and brass can be cooled slowly in air or quickly by quenching in water. In this fashion the metal is softened and prepared for further work such as shaping, stamping, or forming.

Those heating treatment change many features of the strips,but in manufacturing we are care about the hardness values more. Different treatment different hardness,in our experience.

Annealed : hardness blew to 240HV

Hardened and tempered: more the 30HRC, up to 60HRC (difficulty for the traditional facility ).

For the steel strip have to statement: cold rolled steel strip and hot rolled steel strip.

Cold rolled steel strip hardness from 20HRC to 30HRC (carbon steel).

Some parameters for the usual material.

1.Grades:

a.High carbon steel strip CK50,CK60,CK70,CK67,CK75 etc

b.Alloy steel strip 50CrV4,60Si2Mn

c.Stainless steel strip AISI 420,430,410,409

2.Hardness max to 55HRC

3.Annealed, cold rolled, hardened and tempered

4.Thickness from 0.15 to 2.5mm ,width from 8.0 to 650mm

5.Price USD 800-1500 per ton

Steel strips can be widely used to manufacturing of tools, trowel,putty knife, spring in roller shutter system, wood bandsaw blade, wood circal saw, metal show accessories (steel toe cap, steel shank, etc), metal clips, stamping accessories, etc.

I am Peter Yang from the manufacturer of steel strip, hope to communicate with the people in this zone, my email

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