FIELD: metallurgy.
SUBSTANCE: invention relates to composition of heat-resistant chromium martensite steel used for making elements, including boilers, pipes for steam pipelines in power plants. Steel contains, wt.%: carbon 0.09-0.13, silicon - not over 0.1, manganese 0.3-0.4, chromium 8.5-9.5, nickel not over 0.2, tungsten 1.5-2.0, molybdenum 0.4-0.6, cobalt 2.5-3.5, vanadium 0.15-0.2, niobium 0.04-0.06, tantalum 0.08-0.1, nitrogen - less than 0.005, boron 0.01-0.013, sulfur - not over 0.006, phosphorus not over 0.01, copper not over 0.1, aluminium not over 0.01, iron - the rest.
EFFECT: this steel has high durable strength values.
3 cl, 3 tbl
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Authors
Dates
2016-09-27—Published
2014-11-28—Filed