Plate Finishes

Stainless steel plates usually are produced by hot rolling from slabs, which have been directly cast or rolled from ingots; some plates may be produced by direct rolling from the ingot. Plates are generally produced in the annealed condition and are either blast cleaned or pickled. When blast cleaned, the plates are subjected to further cleaning in appropriate acids to remove possible iron contamination. Stainless steel plate can be produced in the conditions and surface finishes shown in

Table 5.

Table 5 Conditions and surface finishes for stainless steel plate

Condition and finish

Description and remarks

Hot rolled

Scale not removed; not heat treated; plate not recommended for final use in this condition(a)

Hot or cold rolled, annealed or heat treated

Scale not removed; use of plate in this condition generally confined to heat-

resisting applications; scale impairs corrosion resistance.

Hot or cold rolled, annealed or heat treated, blast cleaned or pickled

Condition and finish commonly preferred for corrosion-resisting and most heat-resisting applications

Hot or cold rolled, annealed, descaled, and temper passed

Smoother finish for specialized applications

Hot rolled, annealed, descaled, cold rolled, annealed, descaled, optionally temper passed

Smooth finish with greater freedom from surface imperfections than any of the above

Hot or cold rolled, annealed or heat treated, surface cleaned and polished

Polished finishes similar to the polished finishes on sheet

Source: Ref 2

Source: Ref 2

(a) Surface inspection is not practicable for plate that has not been pickled or otherwise descaled.

Table 5 indicates that polished finishes similar to those for sheet are available for plate. Technically speaking, there is no No. 4 finish for plate, nor is there a No. 8 finish. However, arrangements can be made either with a mill or an independent polisher to grind and polish plate in the same manner as sheet. This work should be specified on the basis of submitted samples.

Plate commonly is conditioned by localized grinding to remove surface imperfections on either or both surfaces; ground areas are well flared and the thickness is not reduced below the allowable tolerance in any of these areas.

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