US3865581A - Heat resistant alloy having excellent hot workabilities - Google Patents

Heat resistant alloy having excellent hot workabilities Download PDF

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Publication number
US3865581A
US3865581A US326459A US32645973A US3865581A US 3865581 A US3865581 A US 3865581A US 326459 A US326459 A US 326459A US 32645973 A US32645973 A US 32645973A US 3865581 A US3865581 A US 3865581A
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heat resistant
hot
resistant alloy
present
workabilities
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Shozo Sekino
Mizuo Sakakihara
Shoji Murota
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Nippon Steel Corp
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Nippon Steel Corp
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    • 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
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/058—Alloys based on nickel or cobalt based on nickel with chromium without Mo and W
    • 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

Definitions

  • Heat resistant alloys are used for applications such as furnace parts,.burner nozzles, annealing boxes and protecting tubes for thermocuples and in recent years they have been widely used for components of atomic piles. These alloys are usually deformed at high temperatures (hot worked). Since the hot working is a working method which makes use of the character of the alloys that they soften at high temperatures, the hot working has an advantage that products of good dimentional accuracy can be easily obtained by small working power.
  • an austenite steel containing 7 to 20% of nickel and 14 to 25% of chromium can be mentioned.
  • this conventional heat resistant steel and the like contain Si and W so as to increase hardness and tensile strength as well as wear resistance at high temperatures, and there are very few heat resistant alloys having intentionally improved hot workabilities.
  • the present inventors have conducted various studies and experiments to overcome the defects and difficulties of the conventional alloys and have completed the present invention.
  • One of the objects of the present invention is to provide a heat resistant alloy having improved heat resistant properties, particularly hot workability.
  • Another object of the present invention is to provide a heat resistant alloy having excellent hot workability and an improved torsion property in a wide temperature range with addition of a small amount of selected alloying elements.
  • the attached drawing shows the synergistic effect of Zr and Ce in relation with the numbers of torsions.
  • the present invention is based on the discovery that when B, Zr, Ce, Mg and Be are selectively added in combination to a high-nickel and high-chromium austenite steel, the numbers of torsions can be increased in a wide range at high temperatures. The increase of the number of torsions represents improvement of the hot workability.
  • a heat resistant alloy having hot workability comprising 0.01 to 0.5% of C, 0.01 to 2.0% of Si, 0.01 to 3.0% of Mn, 22 to 80% of Ni and to 40% of Cr as basic components together with one or both of 0.0005 to 0.20% of B, and 0.001 to 6.0% of Zr and further one or more of 0.001 to 0.5% of Ce, 0.001 to 0.2% of Mg and 0.001 to 1.0% of Be, with the remainder being iron and unavoidable impurities,
  • a heat resistant alloy having excellent hot workability comprising 0.01 to 0.5% of C, 0.01 to 2.0% of Si, 0.01 to 3.0% of Mn, 22 to 80% of Ni, 10 to 40% of Cr as basic components, together with one or both of 0.0005 to 0.20% of B and 0.001 to 6.0% of Zr and further one or more of 0.001 to 0.5% of Ce, 0.001 to 0.2% of Mg and 0.001 to 1.0% of Be and still further one or more ofO.l to 10.0% of M0, 0.1 to 10.0% of W, 0.1 to 30.0% of Co, 0.05 to 10.0% of each of Ti, Nb, Ta, A1, V, Cu and Y (0.05 to 10.0% in total) with the remainder being iron and unavoidable impurities,
  • composition range of the present heat resistant alloy is: 0.01 to 0.45% of C, 0.01 to 0.15% of Si, 0.01 to 0.15% of Mn, 35 to of Ni, 10 to 25% of Cr, as basic components together with one or more of0.l to 10% ofMo, 0.1 to 10% ofCo, 0.1 to 10% of W, 0.001 to 0.03% of B, 0.01 to 1.0% of Zr, 0.01 to 0.1% of Ce, 0.001 to 0.01% of Mg, 0.001 to 0.1% of Be, 0.2 to 4.5% of Ti, 0.2 to 4.5% of Al, 0.05 to 0.1% of Y, 0.05 to 0.1% of Cu and still further one or more of Nb, V and Ta in an amount of 0.1 to 4.5 for each.
  • the hot workability depends on the ductility of grain boundaries, ductility of the matrix, non-metallic inclusions, precipitates and so on.
  • 35 to 65% of Ni and 15 to 35% of Cr are most desirable, and for the improvement of the ductility of grain boundaries, it is necessary to decrease the segregations and precipitates at grain boundaries.
  • Mn, Cu and Si segregate at grain boundaries and deteriorate workabilities of the alloy.
  • the grain boundary segregation of these elements is smallest when nickel is present 35 to 65% and chromium is present 10 to 25%. When the nickel content is less than 35% segregation of copper becomes large while the nickel content is more than 65% segregation of manganese and silicon becomes large.
  • Carbon is effective to improve tensile strength, heat resistant properties, such as, creep strength and creep rupture strength as required for a heat resistant alloy, and at least 0.01% of carbon is required for the above improvement.
  • This effect can be obtained when carbon is present together with carbide forming elements such as Mo, Ti and V and the carbides are present in a finely distributed state.
  • An excessive content of carbon forms too large carbides which kill the above effect.
  • the upper limit of the carbon content is defined at 0.5%. Silicon, when contained in an austenite alloy, remarkably reduces scaling at high temperature and improves tensile strength.
  • silicon is present in an amount of 0.01% or more, but an excessive silicon content precipitates the ferrite and the austenite becomes unstable, lowering the heat resistance properties and the hot workabilities.
  • a preferable range of the silicon content is not more 0.15%, but up to 2.0% of silicon is allowed to be present for obtaining the required strength.
  • manganese When manganese is contained in an amount 010,0 1% or more, it stabilizes the austenite and forms carbides to improve creep strength. Up to 3.0% of manganese may be contained for the above purpose. An excessive manganese content lowers the solubility of copper into the austenite and segregates Cu-riched phases of low melting point at the grain boundaries of the austenite, thus remarkably deteriotating hot workabilities and heat resistance properties. For this reason, a smaller amount of manganese is more desirable and a preferable range is 0.01 to 0.15%.
  • nickel and chromium are indispensable for improving heatresistant properties at high temperatures and producing the austenite matrix.
  • many heat resistant alloys have been developed from an austenite Ni 15Cr heat resistant steel.
  • these conventional alloys have not been improved intentionally so as to withstand severe hot workings.
  • the ranges of nickel and chromium contents in the present invention are defined so as to maintain heat resistant properties as required for an heat resistant alloy and to obtain excellent hot workabilities. Namely, 22 to 80% of Ni and 10 to 40% of Cr form a stabilized austenite to give excellent hot workabilities.
  • Heat resistant properties, particularly hot workabilities of the austenite produced by the above composition are already very excellent, but one or both of B and Zr and one or more of Ce, Mg and Be are contained in the present inventive alloys for giving hot workabilities enough to with-stand severe production conditions.
  • B When B is contained in an amount of 0.0005% or more in an austenite heat resistant alloy, creep strength is improved as well as hot workabilities at high temperatures, particularly in a temperature range of 1,100 to l,l50C are improved. But the content of B is beyond 0.2%, defects are formed and the above improvements are lowered. Thus the content of B is defined as 0.0005 to 0.2%, preferably 0.001 to 0.03%.
  • Zr When Zr is contained in an amount of 0.001% or more, heat resistant properties are improved as in case of B addition. Particularly when Zr is present at grain boundaries, it reacts with carbon to form MC carbides to improve intergranular ductility and improve hot workabilities below 1,100C. An excessive content of Zr forms large carbides and tends to kill the desirable effect of Zr addition. A Zr content of greater than 6.0% should be avoided. On the high-carbon side of the present invention, when Zr is contained in an amount of more than eight times the carbon content, the alloy shows tendencies toward embrittlement. Thus a preferable range of the Zr content is 0.01 to 1.0%.
  • Ce, Mg and Be prevent the effective elements such as Fe, Ni, and Mn from being sulfurated or oxidized during the steel making process and thus being partially wasted as impurities, and they are effective to clean the steel and decompose the sulfides remaining at the boundaries of solidifying grains and divide them into fine spheres, thus improving the hot workability above
  • the alloy having the chemical composition defined according to the present invention does not crack under severe hot working conditions.
  • Mo, W, Co, Ti, Nb, Ta, Al, V, Cu and Y may be added selectively to the alloy of the present invention.
  • These elements form carbides nitrides or intermetallic compounds and improve heat resistant properties.
  • Cu and Y, in particular, are effective to give the alloy corrosion resistance in addition.
  • the effects of these elements are observed when Mo, W and Co are present in an amount of 0.1% or more, and when Ti, Nb, Ta, A], V, Cu and Y are present in an amount of 0.05% (also 0.05% in total).
  • An excessive amount of these elements forms too large cabides, nitrides or intermetallic compounds and lowers hot workabilities.
  • the upper limits of these elements are defined as 10% for Mo and W, 30.0% for Co, 10% for Ti, Al, Nb, Ta, V, Cu and Y in single and in combination.
  • Cu causes segregation at grain boundaries together with Mn and Si and deteriorates workabilities.
  • the heat resistant alloy of the present invention can be produced by an ordinary production method which includes melting and refining in a converter or electric furnace, ingot-making, breakingdown, or continuous casting into slabs, hot rolling into wires or plates for commercial use.
  • the alloy of the present invention is produced by electro-slag refining, still further improved hot workabilities are obtained.
  • the hot rolled wires and plates may be subjected to temper treatments or cold rolling in combination with temper treatments for final use.
  • Table 1 shows chemical compositions of 15mm thick plates produced by melting in an electric furnace, ingot-making, breaking-down and hot rolling, and heat resistant properties including hot torsion numbers to show hot workability at 1,100C and creep rupture strength.
  • the alloys A, C, H and L are set forth as comparative to the present inventive alloys.
  • a heat resistant alloy having hot workability consisting essentially of 0.01 to 0.5% of C, 0.01 to 2.0% of Si, 0.01 to 3.0% of Mn, 22 to 80% of Ni and 10 to of Cr as basic components together with one or both of 0.0005 to 0.20% of B, and 0.001 to 6.0% of Zr and further one or more of 0.001 to 0.5% of Ce, 0.001 to 0.2% of Mg and 0.001 to 1.0% of Be, with the balance being iron and unavoidable impurities.
  • a heat resistant alloy having excellent hot workability consisting essentially of 0.01 to 0.5% of C, 0.01 to 2.0% of Si, 0.01 to 3.0% of Mn, 22 to 80% of Ni, 10 to 40% of Cr as basic components, together with one or both of 0.0005 to 0.20% of B and 0.001 to 6.0% of Zr and further one or more of 0.001 to 0.5% of Ce, 0.001 to 0.2% of Mg and 0.001 to 1.0% of Be and still 5 further one or more of 0.1 to 10.0% of M0, 0.1 to
  • a heat resistant alloy having excellent hot workability consisting essentially of 0.01 to 0.45% of C, 0.01 to 0.15% of Si, 0.01 to 0.15% of Mn, 35 to 65% of Ni, 10 to 25% of Cr, as basic components together with one or more of0.1 to 10% of M0, 0.1 to 10% of Co, 0.1 to 10% of W, 0.001 to 0.03% of B, 0.01 to 1.0% of Zr,

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Gas-Filled Discharge Tubes (AREA)
  • Cookers (AREA)
  • Heat Treatment Of Steel (AREA)
US326459A 1972-01-27 1973-01-24 Heat resistant alloy having excellent hot workabilities Expired - Lifetime US3865581A (en)

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JP947972A JPS5631345B2 (es) 1972-01-27 1972-01-27

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GB1424232A (en) 1976-02-11
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