Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/12—All metal or with adjacent metals
  • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
  • Y10T428/12771—Transition metal-base component
  • Y10T428/12861—Group VIII or IB metal-base component
  • Y10T428/12951—Fe-base component
  • Y10T428/12972—Containing 0.01-1.7% carbon [i.e., steel]
  • Y10T428/12979—Containing more than 10% nonferrous elements [e.g., high alloy, stainless]
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/12—All metal or with adjacent metals
  • Y10T428/12993—Surface feature [e.g., rough, mirror]

Definitions

• the invention relates to the use of a chromium-containing alloy for press tools, in particular press plates.
• Press tools in particular press plates, either have a work surface polished to a high gloss if the pressed object e.g. Furniture plate or the like itself should have a smooth surface, or are itself structured so that the pressed material then has this structured surface.
• the pressing tools with a polished, flat surface it is necessary on the one hand, as for the pressing tools with a polished, flat surface, to first of all create a surface that is as smooth as possible and has only a small roughness, which can then be applied using methods known per se, e.g. is processed electrochemically or purely chemically or the like.
• Chromium steels with a content between 11 and 17.5% have proven to be a material for high-gloss polished press plates. proven. However, if chrome steels of this type were surface-treated according to a conventional method, for example etched, then these showed significant structural defects.
• the object of the present invention is to be seen in creating chromium-containing steel alloys which allow uniform structuring and at the same time have a long service life due to their chemical composition.
• the chromium-containing alloy according to the invention for pressing tools, in particular pressing plates, essentially consists in that it has a content in% by weight.
• the chromium equivalent% chromium +% molybdenum + 1.5% silicon + 0.5% niobium ⁇ 17.2 and the nickel equivalent% nickel + 0.5% manganese + 30 % Carbon + 20% nitrogen is > 4.65, the ratio of chromium equivalent to nickel equivalent being ⁇ 3.0 and the ferrite content being ⁇ 5%.
• a temperable, chromium-containing alloy which has a uniform removal after tempering, has a content in% by weight.
• a hardenable chromium-containing alloy which also has a uniform removal, has a content in% by weight
• the roughness according to DIN 4768 is only a measure of the large surface texture, but is not a criterion for local unevenness, as e.g. arise during etching.
• An etching sheet according to Example 1 was placed in an etching container in which there was an aqueous 76.5% ortho-phosphoric acid with 7.4% chromium oxide solution.
• a platinum electrode was also arranged in the etching container, the sheet to be etched being connected as the anode and the platinum mesh as the cathode.
• the current density was set to 1 ampere / cm 2 , the temperature was 25 ° C.
• the etched sheet was removed from the solution, washed with distilled water and dried with hot air. The roughness was only 0.3 to 0.4 / ⁇ m. There was a very uneven removal with an island-like structure.
• a press plate in the dimensions and surface properties according to Example 1 and tempered according to Example 1 was etched according to Example 4, whereby a completely uniform removal was achieved, the surface was matt. No uneven structures could be detected even in oblique light.
• a sheet according to Example 1 of composition E shown in Table 1 (heat treatment: solution annealing at 150 ° C followed by Wasserab Bitcoin and curing at 480 0 C for 2 hours and subsequent air cooling) was dissolved in 15% nitric acid, 3% fluorine-hydrogen acid having , etched at 50 ° C for 100 min. There was an uneven removal with a stripe-like structure, which was clearly recognizable, especially in the slanted direction.
• the roughness according to DIN 4768 RC was 5 - 6 ⁇ m.
• a sheet of chemical composition J according to Table 1 with the dimensions 300 ⁇ 200 ⁇ 2 mm was etched in the device according to Example 1 with the etching solution according to Example 7 at a temperature of 50 ° C. for 100 minutes.
• the roughness corresponded to the sheet of Example 6, but there was even removal even when viewed at an incline.
• a sheet measuring 300 x 200 x 2 mm of composition G according to Table 1 was electrochemically etched in accordance with Example 4.
• the roughness before the etching was 0.5 to 0.8, however, after the etching 0.15 to 0.3 pm.
• the removal was uneven and had a stripe structure, which was particularly evident in the case of oblique lighting.
• Example 8 The procedure of Example 8 was followed with a sheet metal plate which had dimensions and heat treatment analogous to those of Example 8 and had a composition according to Alloy H. It could remove evenly were observed, the surface being matt-glossy and having a roughness of between 0.15 and 0.3 ⁇ m, irregular structures, in particular deeper spots or the like, not being detectable even in oblique lighting.
• An alloy of composition G which had a heat treatment according to Example 6, was electrochemically etched in the device according to Example 7 in 5% hydrochloric acid at 25 ° C. with a current density of 1 ampere / cm 2 .
• the roughness of the sheet was 0.4 to 0.8 ⁇ m after the etching, whereby a completely uneven removal had taken place and the surface had a streaky and pitted appearance, which was clearly and clearly visible, especially under oblique lighting.
• Example 10 The procedure was analogous to Example 10, the composition of the alloy according to Example H in Table 1. A completely uniform removal could be observed, the surface being matt gray and the roughness being 0.4 to 0.8 ⁇ m after the etching treatment. No uneven structuring was observed even under oblique lighting.
• a sheet having a heat treatment according to Example 6 was etched according to Example 1, the roughness being 0.5 to 0.8 ⁇ m before the etching and 0.4 to 0.8 ⁇ m after the etching. However, after etching, the surface was completely uneven and streaky in structure, with local depressions appearing.
• Example 12 The procedure was analogous to Example 12, the composition of the sheet being selected in accordance with Alloy J of Table 1.
• the roughness after the etching was 0.4 to 0.8 ⁇ m. A completely uniform erosion occurred and no uneven structuring could be detected even with oblique lighting.
• Table 1 shows the chemical composition of stainless, martensitic chrome steels (A to D) and of stainless, hardenable chrome steels (E to J) with different ferrite contents. In the case of etching tests under the test conditions listed in Table 2, the removal is only uniform if the ferrite content does not exceed 5%.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• ing And Chemical Polishing (AREA)
• Laminated Bodies (AREA)
• Manufacture And Refinement Of Metals (AREA)

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Citations (2)

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• 1983
  • 1983-06-28 AT AT0235983A patent/AT377785B/de not_active IP Right Cessation
• 1984
  • 1984-06-08 US US06/618,938 patent/US4564566A/en not_active Expired - Lifetime
  • 1984-06-20 EP EP84890115A patent/EP0136997B1/fr not_active Expired
  • 1984-06-20 DE DE8484890115T patent/DE3462927D1/de not_active Expired
  • 1984-06-27 JP JP59131223A patent/JPH0672283B2/ja not_active Expired - Lifetime

Patent Citations (2)

Non-Patent Citations (1)

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