US3708280A - High temperature low alloy steel - Google Patents

High temperature low alloy steel Download PDF

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Publication number
US3708280A
US3708280A US00083835A US3708280DA US3708280A US 3708280 A US3708280 A US 3708280A US 00083835 A US00083835 A US 00083835A US 3708280D A US3708280D A US 3708280DA US 3708280 A US3708280 A US 3708280A
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Prior art keywords
steel
solid solution
ferrite
high temperature
pearlite
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Expired - Lifetime
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US00083835A
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English (en)
Inventor
T Mimino
K Kinoshita
K Hattori
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JFE Engineering Corp
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Nippon Kokan Ltd
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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
    • C22C38/001—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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium

Definitions

  • ABSTRACT A high temperature low alloy steel having a chemical Foreign Apphcluo" Dita composition consisting essentially of between about Nov. l9, I969 Japan ..44/92413 (i) 025% C, -05 0.80% Si. (iii) 0.40 1.30% Mn, (iv) 0.30 0.20% Mo, (v) 0.002 0.015% 52 us. Cl. ..75/124, 75/126 (3, 75/126 E, N in solid solution, less than 0010% Sol. (vi 75 12 1.
  • the present invention relates to an inexpensive low alloy steel having high strength at temperatures within trolled by limiting SolAl to less than 0.010% in order to effect solid solution of N sufficiently.
  • 0.03 0.20% of Mo and 0.01 0.10% of V may be added as additive elements for the purpose of improving creep rupture a range of 450 500C. and has sufficient heat restrength.
  • the amount of such expensive elesistance and strength for use in petroleum refining ments as Mo and V is so small that the cost is also low. processes, boilers and general chemical industrial use.
  • Example 3 The conventional steal Carbon 0.15% Mo 0.50% M0 A D C D E F G steel steel steel 0.18 0.13 0.10 0.17 0.16 0.21 0. 0.17 0.11 0.00 0. 2a 0.20 0. is 0.20 0.34 0.24 0.21 0.22 0.07 1.10 0.86 0. 82 1.00 1.15 0. a0 0. 40 0. 40 0. 0. 0.23 0.13 0. a0 0. 42 0. 04 i. 0.00 0.11 0.10 0.12 0. 07 0.07 0.07 i. 0.12 0.03 0. 04 0. 0s 0. 0i 0. 04 i. t. t. 0.000 0.002 0.001 0.000 0.007 0.003 0.003 0. 003 0. 005 0.007 0.007 0.007 0. 00a 0. 007 0.007 0.007 0.007 0.000 0.000
  • an 0.15% Mo steel has properties between The alloy steel of the present invention is normalized those of an 0.5% Mo steel and carbon steel, such a steel 6! a t perature of 800 950C. and when the alloy is rarely used for various reasons. steel is used in a boiler tube with a small diameter the In designing apparatus as described above, design 30 cooling speed thereof being relatively fast, it shows a stress at various temperatures is determined as the composition of ferrite and pearlite or a composition lowe t v l among th f ll in values b d up n containing a small amount of bainite in pearlite.
  • the hardness is HV I67 l7l, which is relatively a.
  • Table 2 shows tensile strength at are 40 room temperature and high temperatures and Table 3 That is to Say (a) and (b) are the values of tens-e shows creep rupture strength at temperatures of 450 0 o I testing at high temperatures for a short period of time and 500 respectively and (c) and (:1) use the smallest value in creep and creep rupture tests as design stress.
  • TABLE 2 Carbon steel is not used for parts which require Room strength at a temperature of over 400 C. because of Temperame 400C 450C 500.cradical decrease in creep rupture strength and high The alloy t /mm it /mm Kg/mm Kg/mm oftlie A 52.5 53.l 48.0 42.6 temperature tensile strength.
  • the present invention aims to provide, a low cost, a low alloy steel with high design stress at temperatures TABLE 3 u o r of 450 500 C. by alloying carbon steel with seye ral 6O 450C. Wm 5mm.
  • the alloy steel of the present in- P C I35 invention D 27.5 18.3 vention consists essentially of 0.05 0.25% C and 0.05 E 303 202 0.80% Si in a killed steel. In this case, 0.002 0.015% G F 28.6 :27 24.3 .l of N dissolves in the alloy steel in the atmosphere.
  • the carbon eel 3.5 H present invention is characterized in that MN is conconventional L2 5.0
  • the alloy steel of the present invention has a much higher tensile strength than the conventional steel at temperatures of 400 to 500C. in every test piece.
  • the effect of N, in a state of solid solution in the present low alloy steel is limited by controlling the amount of Al to be used; the composite effect of N and solid solution and hardening by adding Mn and Cr in Examples l and 2 and the composite effect of Mn, N, solid solution and hardening by adding Mn in Example 3.
  • creep rupture strength of the alloy steel of the present invention is much higher than that of 0.l5% Mo steel or Carbon steel but slightly lower than that of 0.50% Mo steel.
  • the order of effective elements to be added in order to improve creep rupture strength for a long time is V Mo Cr, but when more than 0.1% of V is added, an extensive improvement of strength is not to be expected.
  • the most efficient amount of Mo addition from an economical point of view is within a range of 0.04 0.12%.
  • Cr scarcely contributes to the improvement of creep strength, but Cr addition can be increased because of low cost and in view of its effectiveness to prevent graphitization during the period of use at a high temperature.
  • the alloy steel of the present invention has a remarkably high tensile strength at high temperatures and creep rupture strength, so that it is able to improve design stress of high temperature and high pressure apparatus at low cost and can be used in a wide range of fields requiring high strength at high temperatures of up to the extent of 500C.
  • the alloy steel of the present invention is suitable for use in boilers, petroleum refining processes and as tube materials for heat exchangers and sheet materials for general chemical industries.
  • High temperature low alloy steel suitable for service at temperatures between 400 and 500C having a chemical composition consisting essentially of C 0.05 0.25% Si 0.05 0.80% n 0.40 l.30% Cr 0 0.10% M0 0.03 0.20% N 0.002 0.05%
  • the high temperature low alloy steel of claim 1 consisting of C 0.05 0.25% Si 0.05 0.80% Mn 0.40 1.30% Cr 0.20 0.70% Mo 0.03 0.20% N 0.002 0.05% in solid solution Sol. Al less than 0.0l0% Fe incidental impurities balance 4.
  • the steel of claim 3 which after being subjected to a normalizing heat treatment at a temperature of 800 950C retains said nitrogen in solid solution and has a microstructure of (i) ferrite and pearlite, or (ii) ferrite and pearlite containing a small amount of bainite.
  • the high temperature low alloy steel of claim I consisting of C 0.05 0.25% Si 0.05 0.80% Mn 0.40 l.30% Cr 0.20 0.70% M0 0.03 0.20% N 0.002 0.015% in solid solution Sol. Al less than 0.0l0% V 0.0l 0. l0% Fe incidental impurities balance 6.
  • the steel of claim 5 which after being subjected to a normalizing heat treatment at a temperature of 800C 950C retains said nitrogen in solid solution and has a microstructure of (i) ferrite and pearlite, or (ii) ferrite and pearlite containing a small amount of bainite.
  • the high temperature low alloy steel of claim 1 consisting of C 0.05 0.25% Si 0.05 0.80% Mn 0.40 l.30% M0 003 0.20% N 0.002 0.0 l 5% in solid solution Sol. Al less than 0.0l0% V 0.0l 0. l0% Fe incidental impurities balance 8.
  • the steel of claim 7 which after being subjected to a normalizing heat treatment at a temperature of 800C 950C retains said nitrogen in solid solution and has a microstructure of (i) ferrite and pearlite, or (ii) ferrite and pearlite containing a small amount of bainite.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
US00083835A 1969-11-19 1970-10-26 High temperature low alloy steel Expired - Lifetime US3708280A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44092413A JPS5121933B1 (de) 1969-11-19 1969-11-19

Publications (1)

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US3708280A true US3708280A (en) 1973-01-02

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US00083835A Expired - Lifetime US3708280A (en) 1969-11-19 1970-10-26 High temperature low alloy steel

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US (1) US3708280A (de)
JP (1) JPS5121933B1 (de)
CA (1) CA937783A (de)
DE (1) DE2056969A1 (de)
FR (1) FR2069680A5 (de)
GB (1) GB1291748A (de)
NL (1) NL7016793A (de)
ZA (1) ZA707387B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3897245A (en) * 1970-04-16 1975-07-29 Republic Steel Corp Low carbon steels having cold workability
US5362338A (en) * 1990-07-27 1994-11-08 Aichi Steel Works Ltd. Non-heat treating steel for hot forging
US5482675A (en) * 1994-08-18 1996-01-09 Amsted Industries Incorporated Cast steel composition for railway components
WO2006026983A1 (de) * 2004-09-09 2006-03-16 Salzgitter Flachstahl Gmbh Voll beruhigter, unlegierter oder niedriglegierter stranggussstahl und verfahren zu seiner herstellung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2418478A (en) * 2004-09-24 2006-03-29 Ti Group Automotive Sys Ltd A heat exchanger

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2121055A (en) * 1937-01-06 1938-06-21 Republic Steel Corp Corrosion resisting iron
US2480151A (en) * 1946-12-23 1949-08-30 Chapman Valve Mfg Co Metal alloy
US3251682A (en) * 1961-11-29 1966-05-17 Yawata Iron & Steel Co Low-alloy tough steel
US3291655A (en) * 1964-06-17 1966-12-13 Gen Electric Alloys
US3348981A (en) * 1964-02-21 1967-10-24 Yawata Iron & Steel Co High tension low temperature tough steel
US3472707A (en) * 1964-04-09 1969-10-14 British Iron Steel Research Alloy steels

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2121055A (en) * 1937-01-06 1938-06-21 Republic Steel Corp Corrosion resisting iron
US2480151A (en) * 1946-12-23 1949-08-30 Chapman Valve Mfg Co Metal alloy
US3251682A (en) * 1961-11-29 1966-05-17 Yawata Iron & Steel Co Low-alloy tough steel
US3348981A (en) * 1964-02-21 1967-10-24 Yawata Iron & Steel Co High tension low temperature tough steel
US3472707A (en) * 1964-04-09 1969-10-14 British Iron Steel Research Alloy steels
US3291655A (en) * 1964-06-17 1966-12-13 Gen Electric Alloys

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3897245A (en) * 1970-04-16 1975-07-29 Republic Steel Corp Low carbon steels having cold workability
US5362338A (en) * 1990-07-27 1994-11-08 Aichi Steel Works Ltd. Non-heat treating steel for hot forging
US5482675A (en) * 1994-08-18 1996-01-09 Amsted Industries Incorporated Cast steel composition for railway components
WO2006026983A1 (de) * 2004-09-09 2006-03-16 Salzgitter Flachstahl Gmbh Voll beruhigter, unlegierter oder niedriglegierter stranggussstahl und verfahren zu seiner herstellung

Also Published As

Publication number Publication date
FR2069680A5 (de) 1971-09-03
CA937783A (en) 1973-12-04
GB1291748A (en) 1972-10-04
DE2056969A1 (de) 1971-07-15
NL7016793A (de) 1971-05-24
ZA707387B (en) 1971-07-28
JPS5121933B1 (de) 1976-07-06

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