US3271138A - Atmospheric corrosion resistant notch ductile high tensile strength steel - Google Patents

Atmospheric corrosion resistant notch ductile high tensile strength steel Download PDF

Info

Publication number
US3271138A
US3271138A US179099A US17909962A US3271138A US 3271138 A US3271138 A US 3271138A US 179099 A US179099 A US 179099A US 17909962 A US17909962 A US 17909962A US 3271138 A US3271138 A US 3271138A
Authority
US
United States
Prior art keywords
tensile strength
atmospheric corrosion
high tensile
steel
corrosion resistant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US179099A
Inventor
Ohtake Tadashi
Muta Toru
Zaizen Takashi
Nishi Tadashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yawata Iron and Steel Co Ltd
Original Assignee
Yawata Iron and Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yawata Iron and Steel Co Ltd filed Critical Yawata Iron and Steel Co Ltd
Application granted granted Critical
Publication of US3271138A publication Critical patent/US3271138A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • C22C38/16—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
    • C22C38/12—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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium

Definitions

  • This invention relates to an atmospheric corrosion resistant notch ductile high tensile strength steel.
  • Nickel is generally in such small amount in natural resources and so costly that any atmospheric corrosion resistant high tensile strength steel which contains much nickel cannot help being costly.
  • the object of the present invention is to provide an atmospheric corrosion resistant high tensile strength steel which contains no nickel, has a tensile strength of 60 to 75 kg./mm. a yield strength of not less than 45 kg./mm. an elongation of not less than 15% with a test piece 25 mm. thick and of a guage length of 200 mm. as rolled, a low sensitivity to notch brittleness and an atmospheric corrosion resistance twice as high as ordinary carbon steel.
  • Said steel is a cheap low alloy atmospheric corrosion resistant notch ductile high tensile strength steel containing 0 to 0.20% carbon, 0.01 to 1.0% silicon, 0.2 to 2.00% manganese, 0 to 0.10% phosphorus, 0.20 to 0.60% copper, 0 to 1.0% chromium, 0.027 to 0.5% titanium and 0.05 to 0.5% niobium, the rest being iron and impurities, the above percentages being by weight based on the total weight of the steel.
  • the figure shows curves representing the results of exposure tests of mild steels and steels according to the present invention when carried out on the roof of a building wherein the weight loss due to corrosion is measured in g./d'm.
  • the respective component elements in the present invention are in the amounts as mentioned above are as follows: when carbon is more than 0.2%, the cold-workability and weldability will deteriorate, therefore, the upper limit is set at 0.2% and the lower limit at 0%, because, even with 0.09%, the expected mechanical properties will be obtained as shown in Table 1.
  • the content is m-ore than 0.2%, it will not be etfective. The content is less than 0.6%, because, when the copper content is greater, it will show an ageing eflect and will be likely to cause surface cracks when it is hot-rolled.
  • copper is also contained as an element for increasing atmospheric corrosion resistance.
  • Silicon is added for deoxidation and is contained within a range of 0.01 to 1.0% depending on the steel making process.
  • Manganese is for deoxidation and also increases the yield strength and tensile strength. with less than 0.2% manganese, these effects will not be apparent. Therefore, the lower limit is set at 0.2%.
  • the upper limit is set at 2.0%, because, above it, the coldworkability and weldability of the steel will be impaired. It is known that, when phosphorus coexists with copper, it will increase the atmospheric corrosion resistance. It will also increase the tensile strength. However, if too much phosphorus is added, the product will become brittle. Therefore, the upper limit is set at 0.10%.
  • the lower limit is set at 0%, because, even when the amount of phosphorus is 0.04%, the expected mechanical properties and atmospheric corrosion resistance will be obtained as shown in Table l by a proper combination of the component elements. Titanium will further improve the atmospheric corrosion resistance of a low copper steel.
  • A represents a mild steel in a composition range of 0.05% C, 0.01% Si, 0.38%, Mn, 0.31% P and 0.18% Cu.
  • B and C represent atmospheric corrosion resistant high tensile strength steels Nos. 4 and 1 in Table 1, respectively.
  • the conventional high tensile strength steel is a steel which has a yield strength of more than 33 kg./m'm. and .a tensile strength of more than 50 kg./mm. and is obtained by having a manganese content of more than 1.0%.
  • 'In the steel according to the present invention even if the manganese content is less than 2.00% and the carbon content is made as low as possible, a tensile strength of 60 to kg./rnm.
  • a yield strength of more than 45 kg./mm. and an elongation of more than 15% will be obtained owing to the effect by titanium.
  • the carbon content is less than 0.20% and the manganese content is less than 2.0%, the weldability is so high that the product can be welded without preheating.
  • the upper limit of the titanium content is set at 0.5%, because, even if more than that is added, the effect on the atmospheric corrosion resistance will be small and, further, the addition of too much titanium is not desirable to the mechanical properties.
  • the lower limit of the titanium content is 0.027% because, below said limit, the ettect of improving the atmospheric corrosion resistance will be small and any increase in strength will hardly be noticed.
  • Chromium is used to increase the yield strength and tensile strength and to improve the atmospheric corrosion resistance and is therefore added as required.
  • the upper limit of chromium is set at 1.0%, because, if more chromium than that is added, the workability and weldability is likely to be reduced.
  • a feature of the present invention is the addition of niobium.
  • niobium When niobium is added and the rolling conditions are properly selected, the resistance of this kind of atmospheric corrosion resistant high tensile strength steel to notch brittleness represented by the V notch Charpy impact value of the hot-rolled steel is further improved as shown in Table 2.
  • the lower limit With less than 0.05% niobium, the effect will not be obvious. Therefore, the lower limit is 0.05%.
  • the upper limit is 0.5%, because, even if more niobium is added, the effect of improviding the impact property will not be great.
  • the product of the present invention is to be used mostly as hot-rolled steel. As described above, its mechanical properties are higher than of any conventional high tensile strength steel. Specifically, while it has a high strength, its sensitivity to notch brittleness ice is lower. Its atmospheric corrosion resistance is also very much higher than of the ordinary carbon steel.
  • the yield strength designates the yield point which is observed in the tension test.
  • An atmospheric corrosion resistant notch ductile high tensile steel which has a tensile strength greater than kg./mm. consisting essentially of 0 to 0.20% carbon, 0.01 to 1.0% silicon, 1.05 to 1.61% manganese, 0 to 0.10% phosphorous, 0.20 to 0.60% copper, 0 to 1.0% chromium, 0.027 to 0.5% titanium, 0.05 to 0.5% niobium, and iron, said percentages being 'by Weight based on the total weight of the steel.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Description

Sept. 6, 1966 TADASH] OHTAKE ET AL. 3,271,138
ATMOSPHERIC CORROSION RESISTANT NOTCH DUCTILE HIGH TENSILE STRENGTH STEEL Filed March 12, 1962 Exposed period in years IN VEN TOR.
Tadashi Ohfake Toru Mu to By Takashi Zaizen Tadashi Ni 5 hi Z Mg ZJZY increasing resistance to atmospheric corrosion.
United States Patent 3,271,138 ATMOSPHERIC CORROSION RESISTANT NOTCH DUCTILE HIGH TENSILE STRENGTH STEETJ Tadashi Ohtake, Tobata, Toru Muta and Takashi Zarnen,
Yawata, and Tadashi Nishi, Wakamatsu, Japan, assignors to Yawata Iron & Steel (10., Ltd., Tokyo, Japan, a corporation of Japan Filed Mar. 12, 1962, Ser. No. 179,099 Claims priority, applizationgapan, Mar. 17, 1961,
lClaim. 61. 75-125 This invention relates to an atmospheric corrosion resistant notch ductile high tensile strength steel.
Nickel is generally in such small amount in natural resources and so costly that any atmospheric corrosion resistant high tensile strength steel which contains much nickel cannot help being costly.
The object of the present invention is to provide an atmospheric corrosion resistant high tensile strength steel which contains no nickel, has a tensile strength of 60 to 75 kg./mm. a yield strength of not less than 45 kg./mm. an elongation of not less than 15% with a test piece 25 mm. thick and of a guage length of 200 mm. as rolled, a low sensitivity to notch brittleness and an atmospheric corrosion resistance twice as high as ordinary carbon steel. Said steel is a cheap low alloy atmospheric corrosion resistant notch ductile high tensile strength steel containing 0 to 0.20% carbon, 0.01 to 1.0% silicon, 0.2 to 2.00% manganese, 0 to 0.10% phosphorus, 0.20 to 0.60% copper, 0 to 1.0% chromium, 0.027 to 0.5% titanium and 0.05 to 0.5% niobium, the rest being iron and impurities, the above percentages being by weight based on the total weight of the steel.
The figure shows curves representing the results of exposure tests of mild steels and steels according to the present invention when carried out on the roof of a building wherein the weight loss due to corrosion is measured in g./d'm.
The reason why the respective component elements in the present invention are in the amounts as mentioned above are as follows: when carbon is more than 0.2%, the cold-workability and weldability will deteriorate, therefore, the upper limit is set at 0.2% and the lower limit at 0%, because, even with 0.09%, the expected mechanical properties will be obtained as shown in Table 1. It is known that copper is an important element in However, unless the content is m-ore than 0.2%, it will not be etfective. The content is less than 0.6%, because, when the copper content is greater, it will show an ageing eflect and will be likely to cause surface cracks when it is hot-rolled. In the present invention copper is also contained as an element for increasing atmospheric corrosion resistance. Silicon is added for deoxidation and is contained within a range of 0.01 to 1.0% depending on the steel making process. Manganese is for deoxidation and also increases the yield strength and tensile strength. with less than 0.2% manganese, these effects will not be apparent. Therefore, the lower limit is set at 0.2%. The upper limit is set at 2.0%, because, above it, the coldworkability and weldability of the steel will be impaired. It is known that, when phosphorus coexists with copper, it will increase the atmospheric corrosion resistance. It will also increase the tensile strength. However, if too much phosphorus is added, the product will become brittle. Therefore, the upper limit is set at 0.10%. The lower limit is set at 0%, because, even when the amount of phosphorus is 0.04%, the expected mechanical properties and atmospheric corrosion resistance will be obtained as shown in Table l by a proper combination of the component elements. Titanium will further improve the atmospheric corrosion resistance of a low copper steel. In
Patented Sept. 6, 1966 the figure, A represents a mild steel in a composition range of 0.05% C, 0.01% Si, 0.38%, Mn, 0.31% P and 0.18% Cu. B and C represent atmospheric corrosion resistant high tensile strength steels Nos. 4 and 1 in Table 1, respectively. The conventional high tensile strength steel is a steel which has a yield strength of more than 33 kg./m'm. and .a tensile strength of more than 50 kg./mm. and is obtained by having a manganese content of more than 1.0%. 'In the steel according to the present invention, even if the manganese content is less than 2.00% and the carbon content is made as low as possible, a tensile strength of 60 to kg./rnm. a yield strength of more than 45 kg./mm. and an elongation of more than 15% will be obtained owing to the effect by titanium. When the carbon content is less than 0.20% and the manganese content is less than 2.0%, the weldability is so high that the product can be welded without preheating. The upper limit of the titanium content is set at 0.5%, because, even if more than that is added, the effect on the atmospheric corrosion resistance will be small and, further, the addition of too much titanium is not desirable to the mechanical properties. The lower limit of the titanium content is 0.027% because, below said limit, the ettect of improving the atmospheric corrosion resistance will be small and any increase in strength will hardly be noticed. Chromium is used to increase the yield strength and tensile strength and to improve the atmospheric corrosion resistance and is therefore added as required. The upper limit of chromium is set at 1.0%, because, if more chromium than that is added, the workability and weldability is likely to be reduced.
A feature of the present invention is the addition of niobium. When niobium is added and the rolling conditions are properly selected, the resistance of this kind of atmospheric corrosion resistant high tensile strength steel to notch brittleness represented by the V notch Charpy impact value of the hot-rolled steel is further improved as shown in Table 2. With less than 0.05% niobium, the effect will not be obvious. Therefore, the lower limit is 0.05%. The upper limit is 0.5%, because, even if more niobium is added, the effect of improviding the impact property will not be great.
The product of the present invention is to be used mostly as hot-rolled steel. As described above, its mechanical properties are higher than of any conventional high tensile strength steel. Specifically, while it has a high strength, its sensitivity to notch brittleness ice is lower. Its atmospheric corrosion resistance is also very much higher than of the ordinary carbon steel.
TABLE 1 No. C Si Mn P Cu Cr Ti Nb 0. 37 1. 48 0. 062 0. 33 0. 40 0. 10 0 15 0. 23 1. 09 0. 057 0. 40 0. l9 0. 07 0 19 0. 29 1. 50 0. 068 0. 29 0. 37 0. 08 0 28 0. l5 1. 27 0. 039 0. 34 0. 55 0. l3 0. 16 0. 42 l. 61 0. 041 0. 45 0. 43 0. l6 0. 23 0. 09 1. 25 0. 058 0. 33 0. 05 0. 08 0. 13 0. 31 1. 38 0. 070 0. 49 0. 31 0. 10 0. 09 0. l9 1. 05 0. 045 0. 36 0. 25 0. 05 0. 16
Elongation in V-notch Oharpy Yield strength Tensile strength percent (GL= impact value (at No in kg./mm. in kg./m1n. 200 mm.) 20 C.) in kg.-
142233 p.s.1. 1422.33 p.s.i. percent elonm./cm. 5,785
gation in 8 ft. lbs
inches 1A"- 52. 6 67. 1 18. 0 4. 9 2A 48. 2 62. 2 21. 0 7. 8 3A.-- 49. 8 62. 6 20. 0 6. 5 4A..- 53. 3 68. 5 18. 5 5. 7 5A 50. 8 66. 3 19. 5 6. 0 6A.-- 52. 4 70. 5 16. 5 3. 5 7A 51. 5 67. 8 l8. 5 5. 3 8A..- 52. 0 70. 8 l7. 0 4. 7
TABLE 2 No. C Si Mn P Cu Cr Ti Nb 1A 0. 12 0.37 1. 48 0.062 0.33 0.40 0. 10 0. 15 1B 0. 12 0. 35 1. 49 0. 065 0. 31 0. 41 0.09 0. 001 5A 0.09 0.42 1. 61 0. 041 0.45 0. 43 0. 16 0.23 513 0, 09 0.43 1. 57 0.043 0. 45 0.42 0. 13 0. 003 6A 0. 17 0. 09 1.25 0. 040 0.33 0. 05 0.08 0. 13 6B 0. 16 10 1. 31 0. 039 0.34 0. 05 0.07 0.003
Elongation in V-noteh Charpy Yield strength Tensile strength percent (GL: impact value (at No. in kglmmfl: in kg./1nm. 200 mm.)= 20 C.) in kg.-
142133 p.s.i. 1422.33 p.s.i. percent elonm./cm. 5,785
gation in 8 ft. lbs
inches 1A... 52.6 67.1 18.0 4. 9 1B 49.5 65.5 18.2 0.8 5A 50. 8 06. 3 19. 5 6. B 49.8 67.1 18.8 1. 2 6A 52. 4 70. 5 16. 5 3. 5 6B 48.8 68.3 17.8 0.7
The yield strength designates the yield point which is observed in the tension test.
What we claim is:
An atmospheric corrosion resistant notch ductile high tensile steel, which has a tensile strength greater than kg./mm. consisting essentially of 0 to 0.20% carbon, 0.01 to 1.0% silicon, 1.05 to 1.61% manganese, 0 to 0.10% phosphorous, 0.20 to 0.60% copper, 0 to 1.0% chromium, 0.027 to 0.5% titanium, 0.05 to 0.5% niobium, and iron, said percentages being 'by Weight based on the total weight of the steel.
References Cited by the Examiner UNITED STATES PATENTS 2,474,766 6/1949 Waggoner et al. 125 2,532,117 11/1950 Newell 75125 2,565,953 8/1951 De Gaspari et al. 75125 DAVID L. RECK, Primary Examiner.
RAY K. WINDHAM, Examiner.
A. M. SANTORO, P. WEINSTEIN,
Assistant Examiners.
US179099A 1961-03-17 1962-03-12 Atmospheric corrosion resistant notch ductile high tensile strength steel Expired - Lifetime US3271138A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP958561 1961-03-17

Publications (1)

Publication Number Publication Date
US3271138A true US3271138A (en) 1966-09-06

Family

ID=11724378

Family Applications (1)

Application Number Title Priority Date Filing Date
US179099A Expired - Lifetime US3271138A (en) 1961-03-17 1962-03-12 Atmospheric corrosion resistant notch ductile high tensile strength steel

Country Status (2)

Country Link
US (1) US3271138A (en)
GB (1) GB1000868A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3516865A (en) * 1967-08-30 1970-06-23 Gen Electric Electrochemical cell including iron-chromium alloy conductor connected to cathode
US3787201A (en) * 1967-09-18 1974-01-22 Nippon Steel Corp High tensile strength steel plate for cold-forming
US4256517A (en) * 1978-01-09 1981-03-17 Republic Steel Corporation Welded alloy casing
US4529454A (en) * 1981-02-27 1985-07-16 Hitachi Ltd Low C-Cr-Mo steel used under wet steam

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05239591A (en) * 1992-02-27 1993-09-17 Nkk Corp Steel excellent in wear resistance

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2474766A (en) * 1945-10-11 1949-06-28 Alvin G Waggoner Alloy steel
US2532117A (en) * 1946-09-17 1950-11-28 Babcock & Wilcox Tube Company Nickel steel alloys
US2565953A (en) * 1948-04-08 1951-08-28 Terni Ind Elettr Low alloy steel of high mechanical strength, little sensitive to quenching, weldable, etc.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2474766A (en) * 1945-10-11 1949-06-28 Alvin G Waggoner Alloy steel
US2532117A (en) * 1946-09-17 1950-11-28 Babcock & Wilcox Tube Company Nickel steel alloys
US2565953A (en) * 1948-04-08 1951-08-28 Terni Ind Elettr Low alloy steel of high mechanical strength, little sensitive to quenching, weldable, etc.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3516865A (en) * 1967-08-30 1970-06-23 Gen Electric Electrochemical cell including iron-chromium alloy conductor connected to cathode
US3787201A (en) * 1967-09-18 1974-01-22 Nippon Steel Corp High tensile strength steel plate for cold-forming
US4256517A (en) * 1978-01-09 1981-03-17 Republic Steel Corporation Welded alloy casing
US4529454A (en) * 1981-02-27 1985-07-16 Hitachi Ltd Low C-Cr-Mo steel used under wet steam
USRE33006E (en) * 1981-02-27 1989-08-01 Hitachi, Ltd. Feed-water heater comprising low C-Cr-Mo steel components used under wet steam

Also Published As

Publication number Publication date
GB1000868A (en) 1965-08-11

Similar Documents

Publication Publication Date Title
US2848323A (en) Ferritic steel for high temperature use
US6312532B1 (en) Ferritic-austenitic steel alloy
US4537644A (en) High-tension high-toughness steel having excellent resistance to delayed fracture and method for producing the same
US3574602A (en) High tension tough steel having excellent property resisting to delayed rupture
GB2071147A (en) Copper and nitrogen containing austenitic stainless steel
US4256486A (en) Martensitic stainless steel having excellent weldability and workability for structural use
US4892704A (en) Low Si high-temperature strength steel tube with improved ductility and toughness
US3532491A (en) Maraging steel suitable for heavy section applications
US3711340A (en) Corrosion-resistant high-strength low-alloy steels
US3271138A (en) Atmospheric corrosion resistant notch ductile high tensile strength steel
US3997372A (en) High strength low alloy steel
US3266876A (en) Ferrous weld deposit and structure
US2711959A (en) Welding steel for developing high surface hardness under impact
US3075839A (en) Nickel-free austenitic corrosion resistant steels
US3336168A (en) Weldable tough steel essentially composed of chromium and manganese and method of manufacturing the same
US4561890A (en) Two-phase stainless cast steel having high corrosion fatigue strength
US1990590A (en) Alloy steel
JPS61113749A (en) High corrosion resistance alloy for oil well
US3723196A (en) Age-hardening iron-base alloy with improved toughness
US3620717A (en) Weldable, ultrahigh tensile steel having an excellent toughness
US2978319A (en) High strength, low alloy steels
JPH07138708A (en) Austenitic steel good in high temperature strength and hot workability
GB2160221A (en) Two phase stainless steel having improved impact characteristic
US3533780A (en) High-strength austenitic stainless steel for a boiler
US3677744A (en) Age hardening stainless steel