a8 unit weight steel plate

a8 unit weight steel plate

a8 unit weight steel plate

Supply of a8 unit weight steel plate

		Sheet	Plate	Flat	Diameter

Applications of a8 unit weight steel plate

  A popular grade for toolmakers, a8 unit weight steel plate is used in a wide variety of tool making applications. Typical applications include blanking dies and punches for sheet in stainless steel, brass, copper, zinc and hard abrasive materials generally. Other application include deep drawing dies, cupping dies, forming dies, sheet metal forming rolls, shear blades for strip and sheet including flying shears, circular cutters for cold rolled strip, trimmer dies, thread rolling dies, cold extrusion dies, broaches, plug gauges, ring gauges, special taps, straybolt taps, brick and tile mould liners, master hobs for cold hobbing plastic moulds and cut moulds for plastics.

Forging of a8 unit weight steel plate

Heat the a8 unit weight steel plate tool steel slowly and uniformly to 700°C then more rapidly to 900-1040°C. After forging cool down slowly.

When tools made from a8 unit weight steel plate tool steel are heavily machined, ground or otherwise subjected to cold work, the relief of internal strains is advisable before hardening to minimise the possibility of distortion. Stress relieving should be done after rough machining. To stress relieve, heat the component to 600-650°C. Soak well and cool in the furnace or in air. The tools may then be finish machined before hardening.

Hardening of a8 unit weight steel plate

Martempering  of a8 unit weight steel plate

Martempering is an alternative hardening procedure which may be used when suitable salt bath equipment is available. By this method internal strain, distortion and risk of quench cracking are reduced to the minimum. Pre-heat dry at 300-400°C. Pre-heat in salt at 800-850°C holding in the salt for ten minutes per inch of ruling section. Raise to the hardening temperature of 950-980°C holding in the salt for ten minutes per inch of ruling section. Marquench in salt at 230-250°C holding in the bath for five minutes 25mm of ruling section. Cool in still air. Tempering will be necessary. 
 

Tempering of a8 unit weight steel plate

Double tempering is recommended. Tempering of a8 unit weight steel plate should be done with the least possible delay after hardening, preferably when the tools are still hand warm. Select a suitable tempering temperature, bearing in mind the service requirements. Heat slowly and uniformly. When the a8 unit weight steel plate component has reached the desired temperature, soak for at least one hour per 25mm of section. The second tempering should be a repetition of the first. 

Heat treatment of a8 unit weight steel plate

Final Grinding of a8 unit weight steel plate

Select the correct grade of wheel in consultation with the grinding wheel manufacturer. Ensure the grinding wheel is in good condition by means of a suitable dressing tool. Wet grinding is a preferable option using a copious supply of coolant. If dry grinding is resorted to then use a very soft wheel.

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