FIELD: metallurgy.
SUBSTANCE: invention relates to the field of metallurgy, namely to the production of casting corrosion-resistant welded cryogenic steels, which do not require heat treatment after welding; it can be used in power engineering in the manufacture of complex-profiled casting-welded structures of liquid rocket engines (hereinafter – LRE) with cryogenic fuel components, operating in aggressive media at temperatures from 77 to 293 K. In an induction crucible furnace, steel is melted, containing components at the following ratio, wt.%: carbon up to 0.03, nitrogen 0.03-0.08, chromium 10.5-13.0, nickel 7.5-9.0, molybdenum 0.8-1.5, cobalt 3.0-4.5, vanadium 0.1-0.3, manganese 0.3-0.7, silicon 0.3-0.6, cerium 0.005-0.1, lanthanum 0.005-0.08, calcium 0.001-0.03, tungsten up to 0.2, niobium up to 0.2, titanium up to 0.08, iron is the rest. During steel melting, according to a magnetic sample, a phase composition is adjusted until obtaining at least 95% of martensite in cast metal, the rest is residual austenite. Then, heat treatment is carried out according to a mode of heat stabilization of secondary austenite, including calcination from 1040-1060°C, heating and isothermal exposure at 560-580°C, repeated calcination from 740-760°C, cold treatment at -70°C, and aging at 500°C.
EFFECT: strength characteristics and operational reliability of high-loaded welded structures of cryogenic equipment, used without heat treatment after welding, are increased.
2 cl, 2 tbl
Title | Year | Author | Number |
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CORROSION-RESISTANT CASTING STEEL | 0 |
|
SU901336A1 |
HEAT TREATMENT METHOD OF CORROSION-RESISTANT MARTENSITE-AGING STEELS | 2013 |
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RU2532785C1 |
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RU2493286C2 |
METHOD FOR HEAT TREATING STAINLESS STEEL | 0 |
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SU1014934A1 |
CORROSION RESISTANT-CAST STEEL | 1998 |
|
RU2169788C2 |
SOFTENING HEAT TREATMENT METHOD OF PRODUCTS MADE FROM AUSTENITIC-MARTENSITIC STEEL OF 07X16H6 GRADE | 2012 |
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RU2499842C1 |
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Authors
Dates
2022-08-23—Published
2020-09-04—Filed