# US 2019/0169721 A1 · Martensitic steel with delayed z-phase formation, and component > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0169721 A1 - Document ID: US20190169721A1 - Status: Published application - Kind: A1 - Application number: 16/092,456 - Filed: 2017-04-12 - Published: 2019-06-06 - Earliest claimed: 2016-04-15 - Assignees: Siemens Aktiengesellschaft - Applicants: Siemens Aktiengesellschaft - Inventors: Torsten-Ulf Kern; Axel Bublitz; Karsten Kolk; Torsten Neddemeyer - Web page: https://patentgrep.com/patent/US20190169721A1 ## CPC - C22C 38/54: with boron - C22C 38/001: {containing N} - C22C 38/02: containing silicon - C22C 38/04: containing manganese - C22C 38/40: with nickel - C22C 38/44: with molybdenum or tungsten - C22C 38/46: with vanadium - C22C 38/48: with niobium or tantalum - C22C 38/52: with cobalt - F01D 25/005: {Selecting particular materials} - C21D 6/002: {containing Cr (C21D6/004 takes precedence)} - F22B 37/04: and characterised by material, e.g. use of special steel alloy - C22C: ALLOYS (treatment of alloys C21D, C22F) - F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D) - C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B) - F22B: METHODS OF STEAM GENERATION; STEAM BOILERS ## Abstract An iron-based steel comprising at least (in wt. %): carbon (C): 0.01%-0.10%; silicon (Si): 0.02%-0.7%; manganese (Mn): 0.3%-1.0%; chromium (Cr): 8.0%-10%; molybdenum (Mo): 0.1%-1.8%; cobalt (Co): 0.8%-2.0%; nickel (Ni): 0.008% -0.20%; boron (B): 0.004% -0.01%; nitrogen (N): 0.03% -0.06%; vanadium (V): 0.1% -0.3%, particularly 0.15% -0.022% of vanadium (V), more particularly 0.185% of vanadium (V); niobium (Nb): 0.01% -0.07%; optionally tungsten (W): 2.0% -2.8%, particularly 2.4% of tungsten; the remainder being iron (Fe); wherein said steel consists in particular of these elements. ## Claims ### Claim 1 An iron-based alloy comprising at least (in % by weight): Carbon (C): 0.01%-0.10%, Silicon (Si): 0.02%-0.7%, Manganese (Mn): 0.3%-1.0%, Chromium (Cr): 8.0%-10%, Molybdenum (Mo): 0.1%-1.8%, Cobalt (Co): 0.8%-2.0%, Nickel (Ni): 0.008%-0.20%, Boron (B): 0.004%-0.01%, Nitrogen (N): 0.03%-0.06%, Vanadium (V): 0.1%-0.3%, Niobium (Nb): 0.01%-0.07%, balance iron (Fe). ### Claim 2 (depends on 1) A component or powder comprising at least an alloy as claimed in claim 1. ### Claim 3 (depends on 1) The alloy or component as claimed in claim 1 consisting of iron, carbon, silicon, manganese, chromium, molybdenum, cobalt, nickel, boron, nitrogen, vanadium, and niobium. ### Claim 4 (depends on 1) The alloy or component as claimed in claim 1 which does not contain copper. ### Claim 5 (depends on 1) The alloy or component as claimed in claim 1 which does not contain titanium. ### Claim 6 (depends on 1) The alloy or component as claimed in claim 1 which does not contain aluminum. ### Claim 7 (depends on 1) The alloy or component as claimed in claim 1 containing tungsten. ### Claim 8 (depends on 1) The alloy or component as claimed in claim 1 containing 0.01%-0.05% of carbon. ### Claim 9 (depends on 1) The alloy or component as claimed in claim 1 containing 0.3%-0.4% of silicon. ### Claim 10 (depends on 1) The alloy or component as claimed in claim 1 containing 0.4%-0.6% of manganese. ### Claim 11 (depends on 1) The alloy or component as claimed in claim 1 containing 8.6%-9.6% of chromium. ### Claim 12 (depends on 1) The alloy or component as claimed in claim 1 containing 0.1%-0.2% of molybdenum (Mo). ### Claim 13 (depends on 1) The alloy or component as claimed in claim 1 containing 1.6%-2.0% of cobalt. ### Claim 14 (depends on 1) The alloy or component as claimed claim 1 containing 0.005%-0.015% of nickel. ### Claim 15 (depends on 1) The alloy or component as claimed in claim 1 containing 0.004%-0.008% of boron. ### Claim 16 (depends on 1) The alloy or component as claimed in claim 1 containing 0.03%-0.07% of niobium. ### Claim 17 (depends on 1) The alloy or component as claimed in claim 1 containing 0.06%-0.1% of carbon. ### Claim 18 (depends on 1) The alloy or component as claimed in claim 1 containing 0.04%-0.06% of silicon. ### Claim 19 (depends on 1) The alloy or component as claimed in claim 1 containing 0.7%-0.9% of manganese. ### Claim 20 (depends on 1) The alloy or component as claimed in claim 1 containing 1.4%-1.6% of molybdenum. ### Claim 21 (depends on 1) The alloy or component as claimed in claim 1 containing 0.85%-1.1% of cobalt. ### Claim 22 (depends on 1) The alloy or component as claimed in claim 1 containing 0.1%-0.2% of nickel. ### Claim 23 (depends on 1) The alloy or component as claimed in claim 1 containing 0.007%-0.01% of boron. ### Claim 24 (depends on 1) The alloy or component as claimed in claim 1 containing 0.015%-0.025% of niobium. ### Claim 25 (depends on 1) The alloy or component as claimed in claim 1 which does not contain tungsten. ### Claim 26 (depends on 7) The alloy or component as claimed in claim 7 containing 2.0%-2.8% tungsten.