Showing papers on "Weldability published in 1981"
Patent•
03 Aug 1981
TL;DR: In this paper, a high strength hot rolled steel sheet with excellent flash butt weldability, fatigue characteristic and formability, has a composite structure composed of polygonal ferrite and bainite and containing from 0.01 to 0.15% by weight of C. The steel sheet is suitable as a material for wheel rims or discs for automobiles.
Abstract: A high strength hot rolled steel sheet having excellent flash butt weldability, fatigue characteristic and formability, has a composite structure composed of polygonal ferrite and bainite and containing from 0.01 to 0.15% by weight of C, from 0.01 to 1.5% by weight of Si and from 0.3 to 2.0% by weight of Mn, the rest being Fe and impurities, the areal ratio of the bainite being from 3 to 60%. The steel sheet is suitable as a material for wheel rims or discs for automobiles.
28 citations
Patent•
11 Sep 1981
TL;DR: In this paper, an Ni-Zn alloy contg. 5W50% Zn is plated to 0.5W20μ thickness on the surface of the steel plate.
Abstract: PURPOSE: To improve corrosion resistance, formability and workability by plating an Ni-Zn alloy having a specific compsn. on the surface of a steel plate for vessels for gasoline, alcohols, etc. CONSTITUTION: A steel plate as vessels for gasoline mixed with various alcohols and alcohols is vulnerable to corrosion by moisure and impurities contained in alcohols. To prevent such corrosion, an Ni-Zn alloy contg. 5W50% Zn is plated to 0.5W20μ thickness on the surface of the steel plate. Or underlying plating of 1 or ≥2 kinds among Ni, Sn, Co is applied thereon at 0.03W1μ thickness prior to the plating of the Ni-Zn alloy. Or further, a film of chromate or phosphate base is applied on the Ni-Zn plating layer to seal the pinholes in the plating layer, whereby corrosion resistance as well as formability and weldability are improved. COPYRIGHT: (C)1983,JPO&Japio
26 citations
01 Nov 1981
TL;DR: In this article, the surface tension gradients on the weld pool were modelled to change fluid flow patterns in a weld pool and thereby the shape of the pool, and the proposed mechanism and the experimental evidence from which it was derived is presented.
Abstract: A number of studies have reported changes in the shape of GTA welds in stainless steels and other materials with variations in the concentration of one or more impurities in the base metal. Several mechanisms have been proposed by which the impurities could influence weld shape, including interaction with and consequent alteration of the arc, changes in the liquid-vapor or solid-liquid interfacial energy, and alteration of fluid flow patterns in the weld pool. Variable GTA weld penetration in stainless steels has been studied at our facility for a number of years. This research has led to a model in which it is proposed that minor elements change weld pool shape by altering surface tension gradients on the weld pool. Changing the surface tension gradients changes fluid flow patterns in the weld pool and thereby the shape of the pool. The proposed mechanism and the experimental evidence from which it was derived is presented. Available experimental evidence on the surface tension behavior of iron and steel melts is also summarized.
22 citations
Patent•
12 Feb 1981
TL;DR: In this paper, a slab of 0.02W0.60 Si, 1.0W2.5 Mn, 0.005W 0.10 Nb, ≥ 1 kinds of limited amts, ≤ 0.008 S and F out of the balance unavoidable impurities is heated to 1,180°C or below temp.
Abstract: PURPOSE: To obtain titled high-tensile steel permitting additional intensification by making the temp. for stopping of the accelerated cooling after heating-rolling under adequate conditions for steel of composition having adequate content of Nb lower than that in the prior art. CONSTITUTION: A slab of 0.02W0.15 C, by %, 0.03W0.60 Si, 1.0W2.5 Mn, 0.005W 0.060 solAl, 0.01W0.10 Nb, ≥1 kinds of limited amts. of Ti, Ni, Cu, Mo, V, Cr, B, Ca, REM and ≤0.008 S and F out of the balance unavoidable impurities is heated to 1,180°C or below temp. at which Nb solutionizes at ≥0.01. Thereafter, it is rolled to ≥ 50% cumulative draft in an austenite recrystallization temp., in succession to which it is rolled to ≥50% cumulative draft at Ar 3 WAr 3 +150°C. Thereafter, it is cooled immediately down to 450W300°C at 2W20°C/sec. cooling rates, after which it is air-cooled. With the accelerated cooling temp. in excess of the upper limit, the two phase structure of ferrite and bainite is formed, and the effect of increasing strength is not large. Below the lower limit, the amt. of martensite increases and this decreases the effect of tempering. COPYRIGHT: (C)1982,JPO&Japio
21 citations
Patent•
27 May 1981
TL;DR: In this article, a rail with a composition consisting of 0.60-0.85% C, 0.1- 0.4 deg.C by 1-4 deg C was hot-rolled, and after that, it was cooled by accelerating a cooling speed between 850-500 deg.
Abstract: PURPOSE:To obtain a rail which is resistant to a severe condition of a high speed operation under a high axial load, and also is satisfactory in weldability, by hot-rolling an Fe alloy containing C, Si, Mn and Cr, and to which Nb, etc. or Mo, etc. have been added as necessary, and after that, cooling it. CONSTITUTION:A rail having composition consisting of 0.60-0.85% C, 0.1-0.8% Si, 0.7-1.5%Mn, 0.2-0.8%Cr, and the balance Fe with inevitable impurities is hot-rolled, and after that, it is cooled by accelerating a cooling speed between 850-500 deg.C by 1-4 deg.C from an austenite area, by which it is possible to obtain a high-strength rail which scarcely generates abrasion and fatigue damage, and satisfactory in weldability. Said basic composition is capable of further containing >= 1 kind among 0.01-0.10%Nb, 0.01-0.10%V and 0.01-0.10%Ti, or >= 1 kind among 0.02-0.10%Mo, 0.02-0.5%Cu and 0.02-0.5%Ni.
17 citations
Patent•
04 Jun 1981
TL;DR: In this article, a surface treated steel plate for a welded can, which steel plate is improved in the antirusting property, and is excellent in the weldability and paintability, plating a steel plate with Ni, and heattreating it so that the Ni layer can be diffused and pentrated into the basis followed by Sn plating and reflowing treatment.
Abstract: PURPOSE: To obtain a surface treated steel plate for a welded can, which steel plate is improved in the antirusting property, and is excellent in the weldability and paintability, plating a steel plate with Ni, and heattreating it so that the Ni layer can be diffused and pentrated into the basis followed bySn plating and reflowing treatment. CONSTITUTION: Ni a plated in a thickness of 0.001W0.05μm on a steel plate, and then it is heat-treated under a reducing atmosphere at a heat cycle of 20sec. or more at about 550°C or more so that all or part of the Ni layer is diffused and penetrated into the base steel plate. Then Sn is plated in a thickness of 0.01W2μm followed by reflowing treatment. According to this method, even through the amount of deposited Sn is less, the surface treated steel plate for a welded can that is excellent in the antirusting properties, the weldability and the paintability is obtained. COPYRIGHT: (C)1982,JPO&Japio
15 citations
Journal Article•
14 citations
Patent•
21 Sep 1981
TL;DR: In this paper, a steel slab contg is heated and rolled at Ar3-Ar3+ 150 deg.C and immediately quenched to 2 deg.c/sec cooling rate.
Abstract: PURPOSE:To manufacture a high tensile steel with superior toughness at low temp. and superior weldability by heating and rolling a steel contg. adequate amounts of B and Ti under specified conditions and by carrying out accelerated cooling. CONSTITUTION:A steel slab contg. 0.02-0.12% C, 0.03-0.60% Si, 1.0-2.5% Mn, 0.005-0.01% sol.Al, 0.01-0.10% Nb, 0.0003-0.003% B, 0.005-0.08% Ti and =50% total draft. It is further rolled at Ar3-Ar3+ 150 deg.C and >=50% total draft and immediately quenched to =2 deg.C/sec cooling rate.
14 citations
Patent•
02 Jun 1981TL;DR: A hydrated chromium oxide-coated steel strip which has a satisfactory weldability and resistance to corrosion under a lacquer coating and which is useful for producing welded cans and other containers is presented in this paper.
Abstract: HYDRATED CHROMIUM OXIDE-COATED STEEL STRIP USEFUL FOR WELDED CANS AND OTHER CONTAINERS \ ABSTRACT OF THE DISCLOSURE A hydrated chromium oxide-coated steel strip which has a satisfactory weldability and resistance to corrosion under a lacquer coating and which is useful for producing welded cans and other containers, comprises a steel strip substrate, plated nickel base layers formed on the surfaces of the steel strip substrate and having a weight of 150 - 2500 mg per m2 of each surface of the substrate, hydrated chromium oxide-containing coating layers formed on the surfaces of the plated nickel base layers and having a weight of 2 - 20 mg, in terms of metallic chromium, per m2 of each surface of the substrate, and, optionally, plated tin intermediate layers formed between the plated nickel base layers and the chromate-containing coating layers and having a weight of 100 - 2000 mg per m2 of each surface of the substrate, the hydrated chromium oxide-containing coating layer optionally being composed of a metallic chromium underlayer in a weight of 10 mg or less per m2 of each surface of the steel strip substrate and a hydrated chromium oxide upper layer, the sum of the weights of the underlayer and the upper layer being 2-20 mg, in terms of metallic chromium, per m2 of each surface of the steel strip substrate.
14 citations
Patent•
15 Apr 1981
TL;DR: In this paper, the authors proposed a method to attain high corrosion resistance and the adhesiveness of a coated film by electroplating Zn, Ti, Sn and Cr to both surfaces of the steel plate and heating the plate to form the diffused phase of these metals then plating a Zn-Ni alloy to one surface thereof.
Abstract: PURPOSE: To attain high corrosion resistance and the adhesiveness of a coated film by electroplating Zn, Ti, Sn and Sr to both surfaces of the steel plate and heating the steel plate to form the diffused phase of these metals then plating a Zn-Ni alloy to one surface thereof. CONSTITUTION: One kind of metal selected from metals such as Zn, Ti, Sn and Cr or the alloys thereof is thinly electroplated on both the front and rear surfaces of the steel plate 1. The steel plate is heated in a non-oxidative atmosphere to form the diffused layer 2 of these metals into the steel. The Zn-Ni alloy plating layer 3 is formed by electroplating, etc., atop either one of the layer 2. The steel plate is thereby subjected to the rust preventive treatments different with the front and rear thereof. The paintability on the outside surface and the corrosion resistance after painting on a steel plate for automobiles, etc., in particular as well as the corrosion resistance on the inside surface of the steel plate are improved and the excellent weldability is also provided to the steel plate. COPYRIGHT: (C)1986,JPO&Japio
Patent•
25 Aug 1981
TL;DR: In this article, a nonrefined high tensile steel plate having excellent low temp. toughness was obtained by hot working a steel slab contained with presribed contents of C, Si, Mn, Nb, B, N, Ti, etc.
Abstract: PURPOSE:To obtain a nonrefined high tensile steel plate having excellent low temp. toughness such as characteristics for stopping propagation of brittle fracture and weldability by hot working a steel slab contained with presribed contents of C, Si, Mn, Nb, B, N, Ti, etc. under prescribed conditions. CONSTITUTION:The steel contg. 0.04-0.12% C, 0.05-0.3% Si, 1.2-2.5% Mn, 0.01-0.1% Nb, 0.0005-0.0003% B, =1 kind among =1 kind among =0.01% Nb is solubilized, the slab is rolled at >=(Ar3 point + 150 deg.C) temp. and >=50% cumulative draft. The rolled plate is rolled at Ar3 point-(Ar3 point + 150 deg.C) temp. and >=50% cumulative draft. The plate is also rolled at (Ar3 point - 80 deg.C)-Ar3 point temp. and >=10% cumulative draft, and is cooled with air.
Patent•
04 Mar 1981
TL;DR: In this paper, a high strength hot-rolled steel plate with superior formability was obtained by speeding up the C, Si and Mn contents of a hot rolled steel plate and the areal percentage of bainite in the structure composed of polygonal ferrite and bainites.
Abstract: PURPOSE: To obtain a high strength hot rolled steel plate with superior formability, eapecially stretch flanging property, resistance weldability and fatigue characteristics by spedifying the C, Si and Mn contents of a hot rolled steel plate and the areal percentage of bainite in the structure composed of polygonal ferrite and bainite CONSTITUTION: This steel plate contains 001W012% c, 01W16%Si and 07W 25%Mn and has a composite structure composed of polygonal ferrite and 5W 60% by area of bainite steel having said composition is hot rolled, cooled to 700W500°C at 5W35°C/sec average cooling rate, further cooled at 25W80°C/sec average cooling rate, and coiled at 575W250°C Thus, this steel can be manufactured C is added to enhance the strength and hardenability, yet excess C increases the didderence in hardness between the flash butt weld line and its vicinity Mn is added to compensate for a reduction in strength due to the lower C content and to obtain bainite, yet excess Mn makes the refining difficult and deteriorates the ductility Si is added to facilitate the formation of polygonal ferrite and to enhance the strength and ductility, yet excess Si causes embrittlement to the weld zone COPYRIGHT: (C)1982,JPO&Japio
Patent•
08 Dec 1981TL;DR: A chromium-plated steel strip has an excellent weldability and a satisfactory resistance to corrosion as discussed by the authors, consisting of a steel strip substrate, a base layer consisting of an amorphous metallic material, for example, Ni-P or Ni-B alloy, in an amount of 3 to 500 mg/m2.
Abstract: A chromium-plated steel strip having an excellent weldability and a satisfactory resistance to corrosion, comprises a steel strip substrate, a base layer consisting of an amorphous metallic material, for example, Ni-P or Ni-B alloy, in an amount of 3 to 500 mg/m2, an intermediate layer consisting of tin in an amount of 2.8 g/m2 or less, and a surface layer consisting of metallic chromium and hydrated chromium oxide in an amount of 5 to 150 mg/m2 and 3 to 30 mg/m2, respectively.
Patent•
11 Dec 1981
TL;DR: In this article, a steel slab consisting of 0.04-0.10% C, 0.05- 0.30% Si, 1.25-2.50% Mn and 0.100% Nb is formed in the hot-rolled steel plate.
Abstract: PURPOSE:To obtain a high tensile steel plate having excellent toughness and weldability by heating a steel slab of specific compsns. to form a solid solution of Nb in the compsn. and rolling the same under control of temp. and draft at specific values. CONSTITUTION:The steel slab consisting basically of 0.04-0.10% C, 0.05-0.30% Si, 1.25-2.50% Mn, 0.010-0.100% Nb, 0.0005-0.0030% B, =0.10 Cu, >=0.10% Ni (0.20-1.00% Cu+Ni) is rolled at >=(Ar3 point+150 deg.C) and >=50% cumulative draft. In succession, the slab is rolled at =50%. Further the slab is rolled in a temp. region of two phases according to need and is then air-cooled. Thus the structure consisting essentially of ferrite and fine bainite as well as island-like martensite is formed in the hot-rolled steel plate.
Patent•
23 May 1981
TL;DR: In this article, a steel contg. is melted and cast into ingot, which is then subjected to hot wire rod rolling, cold drawing, annealing, and cold drawing to manufacture filler metal 1.6mm in diameter.
Abstract: PURPOSE:To provide filler metal, which has excellent resistance to weld crack, for high-manganese, austenitic steel, by using high-manganess steel of specific composition, or by addition of specific quantities of B, N, or various alloy elements separately or in combination. CONSTITUTION:A steel contg. <0.8% C, <1.0% Si, 19-40% Mn, <0.04% P is melted and cast into ingot. The ingot is subjected to hot wire rod rolling, cold drawing, annealing, cold drawing to manufacture filler metal 1.6mm. in diameter. On in addition, one or more members among <10% Ni, <15% Cr, <3% Mo. <4% Co, <3% Cu, or <=2% one or more members among Nb, V, Ti, Zr, Al, or addition elements such as <0.02% B or <0.4% N, etc., are added to said components separately or in combination. Hereby, filler metal, excellent in weldability especially in resistance to weld crack, for high manganese, austenitic steel is manufactured.
Patent•
18 Aug 1981
TL;DR: In this paper, the content ranges of the basic components of a steel were specified, restricting the amount of B and reducing S. This steel plate is applied to a large-sized welded structure such as the branching part of a hydraulic iron pipe for a pumping-up electric power plant.
Abstract: PURPOSE: To obtain a thick high tensile steel plate with high strength and toughness by specifying the content ranges of the basic components of a steel, restricting the amount of B, and reducing the amount of S. CONSTITUTION: This thick high tensile steel plate consist of, by weight, 0.02W 0.20% C, 0.003W0.150% Si, 0.95W3.0% Mn, 0.0005W0.010%P, 0.0001W0.0030% S, 0.05W1.00% Cu, 1.8W4.5% Ni, 0.1W3.0% Cr, 0.05W0.75% Mo. 0.005W0.080% V, 0.01W0.10% sol. Al, 0.0005W0.0060% N, 0.0003W0.0030% O, 0.00015W0.00120% B and the balance essentially Fe or further contains 0.0005W0.0070% Ca while satisfying relations represented by equationsI, II. By said composition hardenability and weldability are ensured, and required high toughness and strength are obtd. This steel plate is applied to a large-sized welded structure such as the branching part of a hydraulic iron pipe for a pumping-up electric power plant. COPYRIGHT: (C)1983,JPO&Japio
Patent•
08 Jul 1981
TL;DR: In this paper, a surface treated steel plate which has corrosion resistance, paintability, and weldability is obtained by carrying out zinc hot dipping on one surface of a steel plate.
Abstract: PURPOSE:To obtain a surface treated steel plate which has corrosion resistance, paintability and weldability by carrying out zinc hot dipping on one surface of a steel plate which has metallic diffusion layers of Ni, Cr, Zn, Zn-Ni alloys, Sn-Ni alloys, etc. on both front and rear surfaces. CONSTITUTION:Electroplating of 1 kind out of about 0.5-20g/m Ni, Zn, Zn- Ni alloys, Sn-Ni alloys or about 0.05-2g/m Cr is carried out on both front and rear surfaces of a steel plate, and the steel plate is heated at about 400-800 deg.C in a non-oxidative atmosphere to allow the plating metal to penetrate and diffuse thoroughly into the steel. About 40-150g.m zinc hot dipping is carried out on one surface of such steel plate by a plating inhibitor method or the like. The resultant steel plate is well suited as a rust inhibitive steel plate for automobiles, wherein the zinc hot dipped side is appropriated for the inside surface of vehicle bodies and the diffusion treated side for the exterior surface. It is possible to improve paintability further by subjecting the zinc hot dipped layer to an alloying treatment.
Patent•
06 May 1981
TL;DR: In this paper, a very thin steel plate is tinned in 0.15W 1.12g/cm 2 amount of tin, and then it is immersed in a soln with chromic anhydride as a principal component and a fluorine compound as an assistant.
Abstract: PURPOSE: To enhance the resistance seam weldability and rust resistance of a very thinly thinned steel plate by depositing metallic chromium and chromium oxide hydrate on the surfaces of the steel plate in a prescribed thickness by electrolytic treatment in a prescribed chromic acid soln. CONSTITUTION: Both sides of a steel plate for surface treatment are tinned in 0.15W1.12g/cm 2 amount of tin. The tinned steel plate is immersed in a soln. contg. chromic anhydride as a principal component and a fluorine compound as an assistant, and it is subjected to elelectrolytic chromic acid treatment as a cathode to deposite 5W50mg/m 2 metallic chromium and 5W50mg/m 2 as chromium of chromium oxide hydrate on the plate surfaces. Thus, the resistance seam weldability and rust resistance are enhanced. COPYRIGHT: (C)1982,JPO&Japio
Patent•
03 Aug 1981
TL;DR: In this paper, a hot-rolled steel plate containing 0.12% C, 1.0-3.0% Mn and 0.5% Si and further contains 0.1% Nb as a precipitation hardening element, 0.02-0.2% V maintaining the hardness of the weld zone and 60% by area.
Abstract: PURPOSE:To provide a high-strength hot-rolled steel plate having superior flash butt weldability and cold workability and contg. a predetermined percentage of >=1 kind of C, Mn, si, Nb, V and Ti and/or Zr and bainite structure by a specified percentage by area or more. CONSTITUTION:The titled hot rolled steel plate contains 0.01-0.12% C, 1.0- 3.0% Mn and 0.01-1.5% Si and further contains 0.01-0.1% Nb as a precipitation hardening element, 0.02-0.2% V maintaining the hardness of the weld zone and =60% by area. By heat treating the above-mentioned steel in accordance with the composition, bainite structure is formed to obtain the steel plate having high flash butt weldability and cold workability required as properties of a material for a wheel rim, a disc, etc.
Patent•
05 Mar 1981
TL;DR: In this paper, the authors proposed a method to improve the weldability under the ultimate conditions of hydrogen-induced cracking resistance steels by selecting the proportion of the inert gas in a shielding gas and the Ti content in a welding wire.
Abstract: PURPOSE:To improve the weldability under the ultimate conditions of hydrogen- induced cracking resistance steels by selecting the proportion of the inert gas in a shielding gas and the Ti content in a welding wire. CONSTITUTION:At the time of subjecting the hydrogen-induced cracking resistance steel base materials of >=0.10 in the value of the parameter A shown by the formula contg. rare earth elements and Ca being hydrogen-induced cracking suppressing components to shielded gas welding at welding current 600-50A, the shielding gas comprising mixed gases of >=20vol% inert gas and CO2 is used. Further, the Ti content in the welding wire composition is increased or decreased from a reference content 0.03% according to the mode of globule migration. If at least one of the proper selections of these wire composition and shielding gas composition is adapted, the good beads having sufficient short-circuiting times are obtained. This method is adapted to circumferential welding etc. of pipes for transferring petroleum and natural gas drawn in areas of extreme cold weather or from deep sea bottoms.
TL;DR: Al-Mg-V alloy is a viable candidate structural material for NET/INTOR as discussed by the authors, which has been characterized by different tests and measurements: corrosion resistance in water at 120°C for up to 3000 hrs, physical sputtering and plasma disruption vaporization behaviour, mechanical properties (tensile tests and creep up to 1000 hrs).
Patent•
14 Sep 1981
TL;DR: In this article, a new precipitation hardened, high strength plate product has been developed that attains 80 ksi minimum strength together with excellent toughness, high formability and weldability without heat treatment or the need to cool at rates faster than air cooling.
Abstract: A new precipitation hardened, high strength plate product has been developed that attains 80 ksi minimum strength together with excellent toughness, high formability and weldability without heat treatment or the need to cool at rates faster than air cooling. The optimum mechanical properties are achieved by a critical balance of carbon in the range of from 0.20-0.26%, manganese in the range of from 1.0-1.7%, vanadium in the range of from 0.08-0.20%, and at least one of from 0.01 to 0.025 nitrogen and from 0.01 to 0.10 columbium, processing the steel to obtain interphase precipitation strengthening, and by a controlled rolling procedure in which there is no substantial rolling below the Ar 3 temperature.
Patent•
11 Dec 1981
TL;DR: In this article, a high Ni alloy is used as the material of the lining of an LNG storage house which is welded under very severe welding conditions, in order to perfectly prevent the occurrence of weld defects during welding, it is necessary to regulate not only the P, S and O contents but also the N content to said ranges.
Abstract: PURPOSE: To obtain a high Ni alloy with superior weldability and corrosion resistance by restricting the N content of a high-Ni iron alloy showing characteristics of "Invar " as well as the P, S and O contents to an extremely low level. CONSTITUTION: This high Ni alloy consists of 30W45% Ni, ≤0.4% Mn, ≤0.25% Si, ≤0.05% C, 0.2W0.4% Cr, (Cr-0.1)%≤Co≤Cr%, ≤0.005% P, ≤0.001% S, 0.003% O, ≤0.002% N and the balance essentially Fe. When this high Ni alloy is used as the material of the lining of an LNG storage house which is welded under very severe welding conditions, in order to perfectly prevent the occurrence of weld defects during welding, it is necessary to regulate not only the P, S and O contents but also the N content to said ranges. When the amounts of the elements exceed said ranges, the occurrence of cracks in the weld metal and at the zone affected by heating can not be prevented. The elements are required to satisfy said conditions at the same time. COPYRIGHT: (C)1983,JPO&Japio
Patent•
07 Oct 1981
TL;DR: In this article, a steel consisting of 0.03-0.20% C, 0.6-2.1% T.Al and balance Fe with inevitable impurities or further contg.
Abstract: PURPOSE:To obtain the titled steel equal or superior to a conventional steel in toughness and much superior to it in weldability even if cooled intensely after controlled rolling by specially combining the composition of a steel with the heating temp. of the slab, the slight controlled rolling and the cooling stopping temp. CONSTITUTION:A steel consisting of 0.03-0.20% C, 0.05-0.60% Si, 0.6-2.5% Mn, 0.005-0.1% T.Al and the balance Fe with inevitable impurities or further contg. one or more among =15 deg.C/ sec cooling rate, the accelerated cooling is stopped at 400-600 deg.C, and the steel is allowed to cool. The Ceq value is obtd. by the equation.
Patent•
24 Dec 1981TL;DR: A chromium-plated steel strip has an excellent weldability and a satisfactory resistance to corrosion as mentioned in this paper, which consists of a steel strip substrate, base layers consisting of an amorphous metallic material, for example, Ni-P or Ni-B alloy, and each having a weight of 3 to 500 mg/m2, intermediate layer consisting of tin and each weight of 2.8 g/m 2 or less.
Abstract: A chromium-plated steel strip having an excellent weldability and a satisfactory resistance to corrosion, comprises a steel strip substrate, base layers consisting of an amorphous metallic material, for example, Ni-P or Ni-B alloy, and each having a weight of 3 to 500 mg/m2, intermediate layers consisting of tin and each having a weight of 2.8 g/m2 or less, and surface layers consisting of metallic chromium and hydrated chromium oxide.
Patent•
25 Sep 1981
TL;DR: In this paper, the authors proposed to obtain a high strength Cr steel with superior weathering resistance and weldability by adding specified percentages of C, Si, Mn, Cr, Ni, Cu, N, O, Nb, V and Ti to Fe.
Abstract: PURPOSE: To obtain a high strength Cr steel with superior weathering resistance and weldability by adding specified percentages of C, Si, Mn, Cr, Ni, Cu, N, O, Nb, V and Ti to Fe. CONSTITUTION: A Cr steel consisting of, by weight, ≤0.08% C, ≤1.0% Si, ≤4.0% Mn, 10W13.5% Cr, <0.1% Ni, ≤1.0% Cu, ≤0.02% N, ≤0.007% O, one or more among 0.005W<0.05% Nb, 0.02W0.1% V and 0.005W0.05% Ti, and the balance Fe with inevitable impurities and having ≤10.5% Cr equiv. represented by the equation is prepared. The structure of the heat-affected zone becomes a single martensite phase and the toughness of the zone is enhanced. COPYRIGHT: (C)1983,JPO&Japio
Patent•
04 Nov 1981
TL;DR: In this article, a high-tough high tensile steel plate with excellent weldability and less separation is produced by rolling a steel ingot at high and middle temps after heat treatments.
Abstract: PURPOSE:To produce a high toughness high tensile steel plate with excellent weldability and less separation by rolling a steel ingot. contg. limited compsn. of C, Si, Mn, Nb, B, N, Ti, Al, S, etc. thoroughly at high and middle temps. after heat treatments. CONSTITUTION:The steel slab contg. 0.04-0.12wt% C, 0.05-0.3% Si, 1.2-2.5% Mn, 0.03-0.10% Nb, 0.0005-0.003% B, =1 kind among =50% cumulative draft at temp. higher than (Ar3 transformation point +150 deg.C), and further the same is subjected to finish rolling to >=60% comulative draft at temp. lower than said temp. and higher than the Ar3 transformation point; thereafter the rolled steel plate is air cooled.