FIELD: metallurgy.
SUBSTANCE: steel article are preheated in air and held at 350°C to 400°C, nitride hardening in atmosphere of ammonia and exogas, oxidising and cooling. Saturation is carried out in atmosphere of ammonia and exogas at volume ratio of 1:1 to 1:4 at 570°C to 630°C with subsequent cooling in exogas or oil. Then, polishing is performed to final size of the article and oxidising in air at 300°C to 400°C for 1-6 hours while cooling is carried out in air.
EFFECT: higher rust resistance, reduces deformation, higher precision.
6 tbl, 6 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF THERMOCHEMICAL TREATMENT OF PARTS | 1996 |
|
RU2124068C1 |
| METHOD FOR THERMO-CHEMICAL PROCESSING OF STEEL DETAILS | 1990 |
|
SU1780340A1 |
| METHOD FOR SHORT-TIME GAS NITRATION OF STEEL ARTICLES | 1990 |
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RU2007496C1 |
| METHOD OF SHORT-TIME GAS NITRIDING OF STEEL PRODUCTS | 1997 |
|
RU2134731C1 |
| METHOD AND AUTOMATIC LINE FOR CHEMICAL-THERMAL TREATMENT OF STEEL PARTS | 0 |
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| METHOD FOR ION NITRIDING OF PRODUCTS MADE OF CONSTRUCTION ALLOY STEELS | 2020 |
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| METHOD OF THE HIGH-TEMPERATURE NITRATION OF THE DETAILS MADE OUT OF THE CORROSION-RESISTANT NICKEL-CHROMIUM STEELS | 2004 |
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| METHOD FOR SURFACE TREATMENT OF STEEL AND CAST IRON PARTS (VERSIONS) | 2001 |
|
RU2186149C1 |
| METHOD OF STEEL PARTS MANUFACTURE | 2000 |
|
RU2194794C2 |
| METHOD FOR CHEMICAL/THERMAL TREATMENT OF ARTICLES OF POWDER MATERIALS | 1986 |
|
RU1410560C |
