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
  • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
  • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
  • B23K35/24—Selection of soldering or welding materials proper
  • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550°C
  • B23K35/3053—Fe as the principal constituent
  • B23K35/3066—Fe as the principal constituent with Ni as next major constituent
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
  • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
  • B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
  • B23K35/0261—Rods, electrodes or wires
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
  • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
  • B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
  • B23K35/0261—Rods, electrodes or wires
  • B23K35/0266—Rods, electrodes or wires flux-cored
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
  • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
  • B23K35/24—Selection of soldering or welding materials proper
  • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550°C
  • B23K35/3053—Fe as the principal constituent
  • B23K35/3073—Fe as the principal constituent with Mn as next major constituent
• • 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
• • 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
  • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
• • 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
  • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
• • 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
  • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
• • 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
  • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
• • 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
  • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
• • 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
  • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
• • 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
  • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
• • 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
  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
• • 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
  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
• • 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
  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
• • 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
  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
• • 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
  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
• • 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
  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
• • 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
  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
• • 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
  • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur

Definitions

• This disclosure relates to steel materials, solid wires, and steel sheaths.
• Patent Document 1 describes a welding wire for obtaining a welding material with a Ni content of about 70%, which has a Ni content of 35 to 70%, contains TiO 2 , SiO 2 and ZrO 2 in a total amount of 4.0 mass% or more relative to the total mass of the wire in the flux, and further contains Mn oxides in an amount of 0.6 to 1.2 mass% calculated as MnO 2 , and when the contents of TiO 2 , SiO 2 , ZrO 2 and MnO 2 (converted amounts) are [TiO 2 ], [SiO 2 ], [ZrO 2 ] and [MnO 2 ], respectively, the ratio [TiO 2 ]/[ZrO 2 ] is 2.3 to 3.3, the ratio [SiO 2 ]/[ZrO 2 ] is 0.9 to 1.5, and ([TiO 2 ]+[SiO 2 ]+[ZrO 2 ])/[MnO 2 ] is 5-13.
• a flux-cored wire having
• Patent Document 2 discloses a "gas metal arc welding solid wire having a composition containing, by mass%, C: 0.2 to 0.8%, Si: 0.15 to 0.90%, Mn: 17.0 to 28.0%, P: 0.03% or less, S: 0.03% or less, Ni: 0.01 to 10.00%, Cr: 0.4 to 4.0%, Mo: 0.01 to 3.50%, B: less than 0.0010%, N: 0.12% or less, V: 0.04% or less, Ti: 0.04% or less, Nb: 0.04% or less, Cu: 1.0% or less, Al: 0.1% or less, Ca: 0.01% or less, REM: 0.02% or less, with the balance being Fe and unavoidable impurities.”
• Patent Document 3 discloses a consumable wire containing, "expressed as a percentage by total weight of the wire, 0.01-0.05% carbon (C), 0.1-1% silicon (Si), 5-9% manganese (Mn), 19-22% chromium (Cr), 15-18%
• Patent document 6 states, "The alloy contains, by weight, C: 0.03% or less, Si: 0.1-1.0%, Mn: 5-20%, Cr: 12-20%, Ni: 5-12%, Cu: 0.02-5.0%, N: 0.1-0.3%, Mo: 0.5-5.0%, W: 0.5-5.0%, Zr: 0.02-0.5%, Ti: 0.02-0.5%, Nb: 0.04-1.0%, V: 0.
• Patent document 7 states, "A wire for use in MIG/arc welding of austenitic stainless steel in a pure inert gas shielded atmosphere, comprising C: 0.02-0.07 wt%, Si: 0.10-0.70 wt%, Mn: 6.0-10.0 wt%, Ni: 15.0-20.0 wt%, Cr: 15.0-20.0 wt%, Mo: 2.0-4.0 wt%, rare earth elements: 0.03-0.30 wt%, P: 0.015 wt% or less, S: 0.005 wt%
• Patent Document 1 JP 2008-246507 A
• Patent Document 2 WO 2020/039643 A
• Patent Document 3 JP 2018-126789 A
• Patent Document 4 JP 2013-103232 A
• Patent Document 5 JP 10-166179 A
• Patent Document 6 JP 7-314178 A
• Patent Document 7 JP 62-197294 A
• the objective of this disclosure is to provide a steel material that is inexpensive and has excellent workability in hot working, and also to provide a solid wire and steel sheath that are highly stable as welding materials.
• the means for solving the problems include the following aspects. ⁇ 1> Chemical composition is expressed as mass% relative to the total mass of the steel material, C: 0 to 0.650%, Si: 0.03 to 0.50%, Mn: 5 to 30%, P: 0 to 0.050%, S: 0 to 0.050%, Cu: 0 to 5.0%, Ni: 5 to 30%, Cr: 0 to 10%, Mo: 0 to 10%, Nb: 0 to 1.00%, V: 0 to 1.00%, Co: 0 to 1.0%, W: 0 to 10%, Pb: 0 to 1.00%, Sn: 0 to 1.00%, Al: 0 to 0.10%, Ti: 0 to 0.10%, B: 0 to 0.100%, N: 0 to 0.500%, O: 0.001 to 0.010%, and the balance: Fe and impurities; A steel material, which satisfies the following formula (a), the following formula (b), and the following formula (c-1), where the amount of nickel in the steel material is [
• the chemical composition is expressed as mass% based on the total mass of the solid wire, C: 0 to 0.650%, Si: 0.03 to 0.50%, Mn: 5 to 30%, P: 0 to 0.050%, S: 0 to 0.050%, Cu: 0 to 5.0%, Ni: 5 to 30%, Cr: 0 to 10%, Mo: 0 to 10%, Nb: 0 to 1.00%, V: 0 to 1.00%, Co: 0 to 1.0%, W: 0 to 10%, Pb: 0 to 1.00%, Sn: 0 to 1.00%, Al: 0 to 0.10%, Ti: 0 to 0.10%, B: 0 to 0.100%, N: 0 to 0.500%, O: 0.001 to 0.010%, and the balance: Fe and impurities;
• the chemical composition is expressed as a mass% relative to the total mass of the steel shell, C: 0 to 0.650%, Si: 0.03 to 0.50%, Mn: 5 to 30%, P: 0 to 0.050%, S: 0 to 0.050%, Cu: 0 to 5.0%, Ni: 5 to 30%, Cr: 0 to 10%, Mo: 0 to 10%, Nb: 0 to 1.00%, V: 0 to 1.00%, Co: 0 to 1.0%, W: 0 to 10%, Pb: 0 to 1.00%, Sn: 0 to 1.00%, Al: 0 to 0.10%, Ti: 0 to 0.10%, B: 0 to 0.100%, N: 0 to 0.500%, O: 0.001 to 0.010%, and the balance: Fe and im
• This disclosure makes it possible to provide a steel material that is inexpensive and has excellent workability in hot working, as well as a solid wire and steel sheath that are highly stable as welding materials.
• the steel material according to the present disclosure has a specific chemical composition. Due to the above-mentioned configuration, the steel material according to the present disclosure is inexpensive and has excellent workability in hot working. The steel material according to the present disclosure was discovered based on the following findings.
• Steel materials that are used as materials for welding materials such as welding wires are required to have improved properties in the weld metal after welding.
• the weld metal contained in liquid hydrogen tanks, liquid carbon dioxide tanks, LNG tanks, etc. is required to have toughness at extremely low temperatures.
• steel materials that contain a large amount of Ni for example, steel materials designed with a Ni content of 70%
• Mn which is an austenite stabilizing element like Ni. That is, by replacing a part of Ni with Mn to reduce the amount of Ni, the cost can be reduced.
• the inventors have investigated a technique for ensuring ease of workability in hot working in a high alloy steel material containing large amounts of elements such as Ni and Mn.
• a technique for ensuring ease of workability in hot working in a high alloy steel material containing large amounts of elements such as Ni and Mn found that by extremely increasing the austenite fraction in the structure of the steel material (preferably making it austenite single phase) in the working temperature range (for example, at temperatures of 800°C or higher), it is possible to ensure ease of workability in hot working (i.e., deformation characteristics at high temperatures).
• a chemical composition of the steel material for increasing the austenite fraction in the structure i.e., deformation characteristics at high temperatures.
• the steel material for welding materials according to the present disclosure has a specific chemical composition, and is therefore inexpensive and has excellent workability in hot working.
• welding materials e.g., solid wires, steel sheaths for flux-cored wires, etc.
• steel materials with poor workability may be unstable and fractured when local strain is applied to the welding materials during welding, which means that the welding materials are poor in stability.
• welding materials made of steel materials with poor workability may be poor in feeding stability to the welding point during welding, and may get stuck or break during feeding.
• the solid wire and steel sheath according to the present disclosure have high stability as welding materials, and the solid wire and the flux-cored wire with a steel sheath according to the present disclosure have excellent feed stability.
• the chemical composition of the steel material according to the present disclosure is as follows: C: 0 to 0.650%, Si: 0.03 to 0.50%, Mn: 5 to 30%, P: 0 to 0.050%, S: 0 to 0.050%, Cu: 0 to 5.0%, Ni: 5 to 30%, Cr: 0 to 10%, Mo: 0 to 10%, Nb: 0 to 1.00%, V: 0 to 1.00%, Co: 0 to 1.0%, W: 0 to 10%, Pb: 0 to 1.00%, Sn: 0 to 1.00%, Al: 0 to 0.10%, Ti: 0 to 0.10%, B: 0 to 0.100%, N: 0 to 0.500%, O: 0.001 to 0.010%, and the balance: Fe and impurities.
• C is an element that generates spatter during welding.
• C is also an interstitial solid solution strengthening element. If the C content of the steel is excessive, the steel becomes hard and the ease of processing decreases. Also, spatter increases. Therefore, the C content of the steel material is set to 0 to 0.650%. However, in order to reduce the C content of the steel material to 0%, the cost of decarbonization increases. In addition, there is a concern that the C content of the steel material will be insufficient, resulting in insufficient strength of the weld metal. Therefore, the lower limit of the C content of the steel material may be set to 0.010%, 0.020%, or 0.030%.
• the upper limit of the C content of the steel material is preferably 0.600%, 0.500%, 0.400%, 0.300%, 0.200%, less than 0.200%, 0.190%, 0.180%, 0.160%, 0.140%, 0.120%, or 0.100%.
• Silicon is a deoxidizing element. If the silicon content of the steel material is too low, the phosphorus content of the steel material increases. On the other hand, Si has a low solid solubility in the austenite phase, and the greater the Si content, the greater the amount of brittle phases such as intermetallic compounds and ⁇ ferrite that are generated at high temperatures, resulting in a deterioration in high-temperature ductility. Therefore, the Si content of the steel material is set to 0.03 to 0.50%.
• the lower limit of the Si content of the steel material is preferably 0.04%, 0.05%, 0.06%, more than 0.06%, or 0.07%.
• the upper limit of the Si content of the steel material is preferably less than 0.50%, 0.48%, 0.45%, 0.40%, 0.35%, 0.30%, or 0.20%.
• Mn is an element that causes an increase in the amount of fumes generated during welding. In order to reduce the amount of fumes generated, the lower the Mn content of the steel material, the more advantageous it is. On the other hand, Mn is an austenite stabilizing element. If the Mn content of a steel material is too low, the workability in hot working (i.e., deformation characteristics at high temperatures) decreases. In addition, austenitization in the weld metal becomes difficult, and low-temperature toughness deteriorates. Therefore, the Mn content of the steel material is set to 5 to 30%.
• the lower limit of the Mn content of the steel material is preferably more than 5%, 5.2%, 5.5%, 6%, more than 6%, 6.2%, 7%, more than 7%, 7.2%, 8%, 10%, more than 10.0%, or 10.2%.
• the upper limit of the Mn content of the steel material is preferably 28%, 26%, 24%, 22%, 20%, 18%, less than 15%, 14.8%, less than 12.3%, or 12.1%.
• the P content of the steel is preferably 0.040% or less, 0.030% or less, 0.020% or less, or 0.015% or less.
• the lower limit of the S content of the steel material is set to 0%.
• the S content of the steel material is preferably 0.0002% or more, and more preferably 0.0003% or more.
• the S content of the steel material is set to 0 to 0.050%.
• the S content of the steel material is preferably 0.040% or less, 0.030% or less, 0.020% or less, 0.015% or less, 0.010% or less, or 0.005% or less.
• Cu is a precipitation strengthening element and may be contained in the steel material to improve the strength of the weld metal.
• Cu is also an austenite stabilizing element and may be contained in the steel material to improve the low temperature toughness of the weld metal.
• the Cu content of the steel material is set to 0 to 5.0%.
• Cu may be contained as an impurity element, and the Cu content of the steel material may be 0.03% or more.
• the lower limit of the Cu content of the steel material is preferably 0.1%, 0.2%, or 0.3%.
• the upper limit of the Cu content of the steel material is preferably 4.5%, 4.0%, or 3.5%.
• Ni is an austenite stabilizing element. If the Ni content of the steel is too low, the workability in hot working (i.e., deformation characteristics at high temperatures) decreases. In addition, austenitization in the weld metal becomes difficult, and low-temperature toughness deteriorates. On the other hand, increasing the Ni content of the steel material increases the cost of the steel material. Therefore, the Ni content of the steel material is set to 5 to 30%.
• the lower limit of the Ni content of the steel material is preferably 5.5%, 6%, more than 6%, 6.2%, 8%, more than 8%, 8.2%, 10%, more than 10%, or 10.2%.
• the upper limit of the Ni content of the steel material is preferably 28%, 26%, 24%, 22%, or 20%.
• Cr is an austenite stabilizing element and may be contained in the steel material to facilitate workability in hot working and to improve the low-temperature toughness of the weld metal.
• Cr content of the steel material is excessive, a martensite structure is formed in the steel material, which reduces the ease of processing.
• the Cr content of the steel material is set to 0 to 10%.
• the lower limit of the Cr content of the steel material is preferably 0.01%, 0.02%, 0.1%, 0.5%, 1%, 2%, 3%, 4%, or 5%.
• the upper limit of the Cr content of the steel material is preferably 9%, 8%, less than 8%, 7.8%, 7%, less than 6%, or 5.8%.
• Mo is a precipitation strengthening element and may be contained in steel to improve the strength of the weld metal.
• Mo content of the steel is set to 0 to 10%.
• the lower limit of the Mo content in the steel material is preferably 0.02%, 0.1%, 0.5%, 1%, 1.5%, or 2%.
• the upper limit of the Mo content of the steel material is preferably 9%, 8%, or 7%.
• Nb is an element that forms carbides in the weld metal and increases the strength of the weld metal, and therefore may be contained in the steel material.
• the Nb content of the steel material is set to 0 to 1.00%.
• the lower limit of the Nb content of the steel material is preferably 0.003%, 0.01%, 0.02%, or 0.03%.
• the upper limit of the Nb content of the steel is preferably 0.80%, 0.60%, 0.40%, 0.20%, or 0.10%.
• V (V: 0 to 1.00%) V is an element that forms carbonitrides in the weld metal and increases the strength of the weld metal, and therefore may be contained in the steel material.
• the V content of the steel material is set to 0 to 1.00%.
• V may be contained as an impurity element, and the V content of the steel material may be 0.003% or more.
• the lower limit of the V content of the steel material is preferably 0.01%, 0.02%, or 0.03%.
• the upper limit of the V content of the steel material is preferably 0.80%, 0.60%, 0.40%, 0.20%, or 0.10%.
• Co (Co: 0 to 1.0%) Co is an element that increases the strength of the weld metal through solid solution strengthening, and therefore may be contained in the steel material.
• the Co content of the steel material is set to 0 to 1.0%.
• the lower limit of the Co content of the steel material is preferably 0.01%, 0.05%, 0.08%, or 0.1%.
• the upper limit of the Co content of the steel material is preferably 0.9%, 0.8%, 0.7%, or 0.6%.
• W is a solid solution strengthening element and may be added to improve strength.
• the W content of the steel material is set to 0 to 10%.
• the lower limit of the W content of the steel material is preferably 0.5%, 1%, 1.5%, or 2%.
• the upper limit of the W content of the steel is preferably 9%, 8%, 7%, or 6%.
• Pb 0 to 1.00%
• the base material for example, a steel plate
• the weld metal during welding
• the machinability of the weld metal and therefore may be contained in the steel material.
• the Pb content of the steel material is set to 0 to 1.00%.
• the lower limit of the Pb content of the steel material is preferably 0.002%, 0.01%, 0.02%, or 0.03%.
• the upper limit of the Pb content of the steel is preferably 0.90%, 0.80%, 0.70%, or 0.60%.
• Sn is an element that improves the corrosion resistance of the weld metal and may be contained in the steel material.
• the Sn content of the steel material is set to 0 to 1.00%.
• the lower limit of the Sn content of the steel material is preferably 0.002%, 0.01%, 0.02%, 0.03%, 0.04%, or 0.05%.
• the upper limit of the Sn content of the steel material is preferably 0.80%, 0.60%, 0.40%, 0.20%, or 0.10%.
• Al is a deoxidizing element and may be contained in the steel material in order to suppress welding defects and improve the cleanliness of the weld metal.
• the Al content of the steel material is excessive, coarse inclusions are generated in the steel material, which reduces the ease of workability.
• Al content of the steel material is set to 0 to 0.10%.
• the lower limit of the Al content of the steel material is preferably 0.001%, 0.01%, 0.02%, or 0.03%.
• the upper limit of the Al content of the steel material is preferably 0.09%, 0.08%, or 0.07%.
• Ti is a deoxidizing element and may be contained in the steel material in order to suppress welding defects and improve the cleanliness of the weld metal.
• the Ti content of the steel material is set to 0 to 0.10%.
• the lower limit of the Ti content of the steel material is preferably 0.002%, 0.01%, 0.015%, or 0.02%.
• the upper limit of the Ti content of the steel material is preferably 0.09%, 0.08%, 0.07%, 0.06%, or 0.05%.
• B is an austenite stabilizing element and an interstitial solid solution strengthening element, and may be contained in the steel material to facilitate workability in hot working and to improve the low temperature toughness and strength of the weld metal.
• B content of the steel material is set to 0 to 0.100%.
• the lower limit of the B content of the steel material is preferably 0.0002%, 0.0003%, 0.0005%, 0.0008%, or 0.001%.
• the upper limit of the B content of the steel material is preferably 0.080%, 0.060%, 0.040%, 0.020%, or 0.010%.
• N is an austenite stabilizing element and an interstitial solid solution strengthening element, and may be contained in the steel material to facilitate workability in hot working and to improve the low temperature toughness and strength of the weld metal.
• N content of the steel material is set to 0 to 0.500%.
• N may be contained as an impurity element, and the N content of the steel material may be 0.002% or more.
• the lower limit of the N content of the steel material is preferably 0.001%, 0.0015%, or 0.002%.
• the upper limit of the N content of the steel material is preferably 0.400%, 0.300%, 0.200%, 0.100%, 0.050%, or 0.015%.
• O (O: 0.001 to 0.010%) O is contained in steel as an impurity.
• the upper limit of the O content is set to 0.010% or less.
• the lower limit of the O content of the steel material is set to 0.001% or more.
• the lower limit of the O content of the steel material is preferably 0.0015% or 0.002%.
• the upper limit of the O content of the steel material is preferably 0.008%, 0.006%, or 0.004%.
• the remaining components in the chemical composition of the steel material are Fe and impurities.
• Impurities refer to components that are mixed in during the industrial production of steel due to raw materials such as ores or scrap, or due to various factors in the manufacturing process, and are acceptable within the range that does not adversely affect the properties of the steel.
• the steel material according to the present disclosure may further contain at least one element selected from the group consisting of Ca, REM, and Mg, in the following amounts, in place of the balance Fe.
• the lower limit of the Ca content of the steel material is preferably 0.0003% or 0.0008%.
• the upper limit of the Ca content of the steel material is preferably 0.008% or 0.006%.
• the lower limit of the REM content of the steel material is preferably 0.0003% or 0.0008%.
• the upper limit of the REM content of the steel material is preferably 0.008% or 0.006%.
• the lower limit of the Mg content of the steel material is preferably 0.0003% or 0.0008%.
• the upper limit of the Mg content of the steel material is preferably 0.008% or 0.006%.
• "REM" is a general term for 17 elements in total, including Sc, Y, and lanthanoids, and REM may include only one type or two or more types. When two or more types of REM are included, the content refers to the total content of REM.
• REM is generally contained in misch metal. Therefore, for example, REM may be contained in the form of misch metal so that the total content of REM falls within the above range.
• Mn, Ni, and Cr are austenite stabilizing elements that improve the workability in hot working (i.e., deformation characteristics at high temperatures) and improve the low-temperature toughness of the weld metal. From this viewpoint, when the amount of manganese in the steel is [Mn], the amount of nickel in the steel is [Ni], and the amount of chromium in the steel is [Cr], the steel satisfies the following formula (a).
• the total of the Mn content, Ni content and Cr content ([Ni] + [Mn] + [Cr]) in the steel material is set to 15% or more.
• the total of the Mn content, Ni content and Cr content ([Ni] + [Mn] + [Cr]) in the steel material is more preferably 18% or more, 20% or more, or 23% or more.
• the Mn content, Ni content, and Cr content in the steel material each satisfy the above-mentioned ranges, and that the total of the Mn content, Ni content, and Cr content ([Ni] + [Mn] + [Cr]) is 60% or less.
• the total of the Mn content, Ni content, and Cr content ([Ni] + [Mn] + [Cr]) in the steel material is more preferably 50% or less, 40% or less, or 35% or less.
• Mn and Ni are austenite stabilizing elements, which improve the workability in hot working (i.e., deformation characteristics at high temperatures) and also improve the low-temperature toughness of the weld metal.
• the steel material satisfies the following formula (b). [Ni]+[Mn] ⁇ 15 (b)
• the sum of the Mn content and the Ni content in the steel material ([Ni]+[Mn]) is set to 15% or more.
• the total of the Mn content and the Ni content ([Ni]+[Mn]) in the steel material is more preferably 18% or more, 20% or more, or 23% or more.
• the Mn content and Ni content each satisfy the above-mentioned ranges, and that the total of the Mn content and Ni content ([Ni] + [Mn]) is 60% or less.
• the total of the Mn content and Ni content ([Ni] + [Mn]) in the steel material is more preferably 50% or less, 40% or less, or 35% or less.
• Mn and Ni are austenite stabilizing elements, which improve the workability in hot working (i.e., deformation characteristics at high temperatures) and also improve the low-temperature toughness of the weld metal. Moreover, excessive increase in Mn causes an increase in the amount of fumes generated during welding. From these viewpoints, when the amount of nickel in the steel is [Ni] and the amount of manganese in the steel is [Mn], the steel satisfies the following formula (c-1).
• the mass ratio ([Ni]/[Mn]) of the Mn content to the Ni content in the steel material is set to 0.20 or more.
• the lower limit of the mass ratio ([Ni]/[Mn]) of the Mn content to the Ni content in the steel material is more preferably 0.30, 0.50, 0.60, 0.70, 0.80, or 1.00. It is more preferable to satisfy the following formula (c-2), and particularly preferable to satisfy the following formula (c-3).
• the upper limit of the mass ratio of the Mn content to the Ni content in the steel material is preferably 10.00, 8.00, or 5.00.
• the austenite fraction in the steel material is preferably 70% or more.
• the austenite fraction is more preferably 80% or more, or 90% or more, and may be 100%.
• the remainder of the structure is martensite.
• the austenite fraction can be controlled to 70% or more by satisfying the above-mentioned formula (a) ([Ni] + [Mn] + [Cr] ⁇ 15), formula (b) ([Ni] + [Mn] ⁇ 15), and formula (c-1) ([Ni]/[Mn] ⁇ 0.20).
• the austenite fraction in the structure of a steel material can be determined by the following method.
• a sample is taken from the steel material, and the bcc content (area%) is measured on the sample surface by a magnetic induction method using a FERITSCOPE (registered trademark) FMP30 (manufactured by Fisher Instruments Inc.) and a Fisher Instruments Inc. probe (FGAB 1.3-Fe) as the probe of the measuring device, and the arithmetic average value of the measured bcc content is calculated.
• the calculated value is regarded as the martensite volume fraction (%) in the structure.
• the austenite fraction (%) in the structure of the steel material is calculated by the following formula.
• Austenite fraction 100 - martensite volume fraction
• the steel material according to the present disclosure has excellent workability in hot working.
• the tensile strength at 800°C is preferably 300 MPa or less, more preferably 280 MPa or less, or 250 MPa or less.
• the lower limit of the tensile strength at 800° C. may be, for example, 100 MPa or more.
• the reduction in area at 800° C. is preferably 40% or more, more preferably 45% or more, or 50% or more.
• the upper limit of the reduction in area at 800° C. may be, for example, 100% or less.
• the tensile strength and reduction of area at 800°C are measured using a hot tensile testing machine. Small test pieces with a diameter of 10 mm and a parallel section length of 110 mm are taken from the steel material and heated to 1200°C at 20°C/sec and held for 10 minutes. The temperature is lowered to the specified temperature (800°C) at 5°C/sec and held for 30 seconds, after which the specimen is tensile broken at a strain rate of 20 mm/sec to determine the tensile strength and reduction of area. The width of the heating zone is 110 mm.
• the steel material according to the present disclosure is used as a raw material for welding materials, that is, the steel material is processed to produce welding materials (e.g., solid wire, flux-cored wire, etc.).
• welding materials e.g., solid wire, flux-cored wire, etc.
• the steel material according to the present disclosure may take the form of, for example, an ingot, a strip or a wire.
• the ingot is a material for hot rolling, while the wire and strip are intermediate materials between the ingot and the welding material.
• the diameter is preferably 1.0 to 10.0 mm, and more preferably 2.0 to 6.0 mm.
• the width is preferably 10 to 20 mm from the viewpoint of workability into welding materials (particularly the steel sheath of a flux-cored wire).
• the thickness of the strip steel is preferably, for example, 0.5 to 2.0 mm.
• the solid wire according to the present disclosure has the following chemical composition, expressed as mass % based on the total mass of the solid wire:
• the steel sheath for the flux-cored wire according to the present disclosure has the following chemical composition, expressed in mass % based on the total mass of the steel sheath:
• the solid wire according to the present disclosure satisfies the following formulas (a), (b), and (c-1), where the amount of nickel in the solid wire is [Ni], the amount of manganese in the solid wire is [Mn], and the amount of chromium in the solid wire is [Cr]:
• the steel sheath for the flux-cored wire according to the present disclosure satisfies the following formulas (a), (b), and (c-1), where the amount of nickel in the steel sheath is [Ni], the amount of manganese in the steel sheath is [Mn], and the amount of chromium in the steel sheath is [Cr]: [Ni] + [Mn] + [Cr] ⁇ 15 (a) [Ni] + [Mn] ⁇ 15 (b) [Ni] / [Mn] ⁇ 0.20 (c-1)
• the solid wire and steel sheath according to the present disclosure have high stability as welding materials.
• the solid wire and the flux-cored wire with a steel sheath according to the present disclosure have excellent feeding stability.
• the tensile strength and reduction of area of the steel materials of the invention and comparative examples were determined using a hot tensile tester. Small test pieces with a diameter of 10 mm and a parallel part length of 110 mm were taken from the steel materials, heated to 1200°C at 20°C/s, and held for 10 minutes. The temperature was lowered to 800°C at 5°C/s, held for 30 seconds, and then tensile fractured at a strain rate of 20 mm/s to determine the tensile strength and reduction of area. The width of the heating zone was 110 mm.
• tensile strength a value of 300 MPa or less was rated as "pass”, and a value of more than 300 MPa was rated as “fail”.
• aperture value a value of 40% or more was rated as "pass,” and a value below 40% was rated as "fail.”
• the steel material of the invention has excellent workability at high temperatures.
• the present embodiment includes the following aspects. ⁇ 1> Chemical composition is expressed as mass% relative to the total mass of the steel material, C: 0 to 0.650%, Si: 0.03 to 0.50%, Mn: 5 to 30%, P: 0 to 0.050%, S: 0 to 0.050%, Cu: 0 to 5.0%, Ni: 5 to 30%, Cr: 0 to 10%, Mo: 0 to 10%, Nb: 0 to 1.00%, V: 0 to 1.00%, Co: 0 to 1.0%, W: 0 to 10%, Pb: 0 to 1.00%, Sn: 0 to 1.00%, Al: 0 to 0.10%, Ti: 0 to 0.10%, B: 0 to 0.100%, N: 0 to 0.500%, O: 0.001 to 0.010%, and the balance: Fe and impurities; A steel material, which satisfies the following formula (a), the following formula (b), and the following formula (c-1), where the amount of nickel in the steel material is [Ni],
• the chemical composition is expressed as mass% based on the total mass of the solid wire, C: 0 to 0.650%, Si: 0.03 to 0.50%, Mn: 5 to 30%, P: 0 to 0.050%, S: 0 to 0.050%, Cu: 0 to 5.0%, Ni: 5 to 30%, Cr: 0 to 10%, Mo: 0 to 10%, Nb: 0 to 1.00%, V: 0 to 1.00%, Co: 0 to 1.0%, W: 0 to 10%, Pb: 0 to 1.00%, Sn: 0 to 1.00%, Al: 0 to 0.10%, Ti: 0 to 0.10%, B: 0 to 0.100%, N: 0 to 0.500%, O: 0.001 to 0.010%, and the balance: Fe and impurities;
• the chemical composition is expressed as a mass% relative to the total mass of the steel shell, C: 0 to 0.650%, Si: 0.03 to 0.50%, Mn: 5 to 30%, P: 0 to 0.050%, S: 0 to 0.050%, Cu: 0 to 5.0%, Ni: 5 to 30%, Cr: 0 to 10%, Mo: 0 to 10%, Nb: 0 to 1.00%, V: 0 to 1.00%, Co: 0 to 1.0%, W: 0 to 10%, Pb: 0 to 1.00%, Sn: 0 to 1.00%, Al: 0 to 0.10%, Ti: 0 to 0.10%, B: 0 to 0.100%, N: 0 to 0.500%, O: 0.001 to 0.010%, and the balance: Fe and im

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Heat Treatment Of Steel (AREA)
• Arc Welding In General (AREA)
• Heat Treatment Of Strip Materials And Filament Materials (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=91196109

Family Applications (1)

Country Status (6)

Citations (14)

Family Cites Families (4)

• 2023
  • 2023-11-21 EP EP23894600.8A patent/EP4624090A4/en active Pending
  • 2023-11-21 JP JP2024560168A patent/JPWO2024111595A1/ja active Pending
  • 2023-11-21 KR KR1020257018770A patent/KR20250100740A/ko active Pending
  • 2023-11-21 WO PCT/JP2023/041863 patent/WO2024111595A1/ja not_active Ceased
  • 2023-11-21 CN CN202380080890.9A patent/CN120265421A/zh active Pending
  • 2023-11-22 TW TW112145140A patent/TW202432855A/zh unknown

Patent Citations (15)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events