Showing papers on "Weldability published in 1978"

Super high strength steel

Abstract: PURPOSE:To provide the title steel with excellent cold workability, high strength, high toughness and good weldability consisting of C, Si, Mn, Cr, Mo, V and Co of each specified amt. and the balance Fe and impurities.

Development of wear resistant and anti-shelling high strength rails in Japan

Abstract: The present situation of high strength rails in Japan is described. Fine pearlitic microstructure is found desirable for both wear resistance and fatigue crack prevention. On the basis of these results a new head-hardened rail has been developed, and a method of improving its weldability is proposed.

Niobium-containing weldable structural steel having good weldability

Abstract: Disclosed herein is a niobium-containing weldable structural steel having good weldability which consists of 0.005-0.04% of C, 0.01-0.50% of Si, 1.20-2.50% of Mn, 0.01-0.07% of Nb, 0.005-0.030% of Ti, 0.005-0.06% of Al and the balance of iron and inevitable impurities whereby [C(%)+1ON(%)] is not greater than 0.10% and Ti(%)/[C(%)+1ON(%)] is from 0.05 to 0.60 in order to restrict the amount of martensite islands in the weld heat affected zone to not greater than 15% in terms of the area fraction.

Manufacture of high tensile steel

Abstract: PURPOSE:To manufacture high tensile steel excellent in strength, toughness and weldability by rapid cooling low-carbon steel billets of a very few S content, after heating at a low temperature and rolling under a special condition. CONSTITUTION:Steel billets containing 0.005-0.08% C, =60% at >=850 deg.C and again rolled in the two phase region of (ferrite + austenite) of 20-70% ferrite volumetric rate at a reduction rate of 10- 60%. After being rolled, the billets are rapidly cooled at a quick cooling rate of more than 10 deg.C/sec to >=600 deg.C temperature in order to manufacture high tensile steel excellent in weldability.

High weldability nickel-base superalloy

Abstract: This is a nickel-base superalloy with excellent weldability and high strength. Its composition consists essentially of, by weight percent, 10-20 iron, 57-63 nickel, 7-18 chromium, 4-6 molybdenum, 1-2 niobium, 0.2-0.8 silicon, 0.01-0.05 zirconium, 1.0-2.5 titanium, 1.0-2.5 aluminum, 0.02-0.06 carbon, and 0.002-0.015 boron. The weldability and strength of this alloy give it a variety of applications. The long-time structural stability of this alloy together with its low swelling under nuclear radiation conditions, make it especially suitable for use as a duct material and controlling element cladding for sodium-cooled nuclear reactors.

Manufacture of high toughness bainite high tensile steel plate with superior weldability

Abstract: PURPOSE: To manufacture a bainite high tensile steel plate with superior weldability and low temp. thoughness by rolling a B and Ti-added steel of extremely low carbon equivalent under specific conditions. CONSTITUTION: A steel ingot is heated to below 1150°C and rolled at a total reduction ratio at below 900°C above 50% and a finish temp. of 700W800°C. The steel contains C; 0.005W0.03%, Si<0.8%, Mn; 1.2W2.2%, S<0.008%, T. Al; 0.005W 0.08%, Ti; 0.005W0.03%, B; 0.0005W0.0020% and N; 0.001W0.008%, and satisfies the following relation between Ti and N: -0.01≤Ti(%)-3.4(N%)≤0.02. In case the steel contains rare earth elements (REM); 0.001W0.03% and Ca; 0.0005W 0.01%, the value of REM%/S% is regulated to 1W10. The low carbon equivalent enhances the weldability, the addn. of B compensates a strength lowering, and the addn. of Ti makes the structure fine and enhances the low temp. toughness. COPYRIGHT: (C)1979,JPO&Japio

Manufacture of nonnrefined high tensile steel

Abstract: PURPOSE:To obtain a non-refined high tensile steel having strength and toughness almost equal to those of refined steel and improved weldability by reducing carbon equivalent of non-refined steel; off-setting a decrease in strength with the addition of B; and rolling the steel of a controlled compsn. at a temp. above Ar3 transformation point followed by proper slow cooling and air cooling.

Stainless cast steel for hydraulic turbine runner

Abstract: PURPOSE: To provide a stainless steel for a high lift hydraulic turbine runner having a specified compsn. of C, Si, Mn, Cr, Ni, Mo, V, etc., contg. a specified amt. of retained austenite and δ-ferrite, and exhibiting superior strength and toughness. CONSTITUTION: The stainless steel consists of, by wt., C 0.01W0.15%, Si 0.1W1%, Mn 0.1W2%, Cr 10W15%, Ni 2W7%, Mo 0.1W3%, V 0.05W0.5% and the balance Fe. To this compsn. may further be added 0.005W0.5% of one or more out of Nb, Zr and Hf. This steel has a mixed structure mainly composed of martensite and retained austenite, and it contains 10W40% of retained austenite and 10% or less of δ-ferrite. This steel is excellent in strength, toughness, corrosion fatigue strength and weldability, and it is suitable for use as a material for a high lift hydraulic turbine runner requiring a strength of about 100kg/mm 2 . COPYRIGHT: (C)1980,JPO&Japio

High performance turbo impeller

Abstract: PURPOSE:To get a high performance impeller having high strength and toughness at high temperatures and good weldability, by making the amount of residual austenite below 10% in martensitic stainless steel.

Production of chrome plated steel plate excelling in weldability

Abstract: PURPOSE: To produce Cr plated steel plates excelling in weldability, in particular, seam weldability, by plating the face and back sides of steel strip having cleaned surface with a specified amount of Sn, treating with electrolytic Cr acid, and precipitating nonmetallic Cr layer of which principal components are limited amounts of metallic Cr and Cr oxide. CONSTITUTION: A steel strip of which surface is cleaned is plated with Sn by less than 2.8g/m 2 on one side (less than 5.6g/m 2 in total of both sides). This steel strip is treated with electrolytic Cr acid to precipitate a nonmetallic Cr layer principally made of metallic Cr by 5W150mg/m 2 by one side (preferably 10W40mg/m 2 ) and Cr oxide of metallic Cr by 3W30mg/m 2 as converted on one side (preferably 7W 12mg/m 2 ). The Soudronic weld zone of Cr plated steel plate 2 by this method has a stable metal (flow line) (c) discharged from the gap between plates, and the contact face with copper wire has a sufficient penetration in the heat input part (d). As compared with the conventional Cr plated steel plate, the plate surface is fused well, and the area of head affected zone (e) is wider. COPYRIGHT: (C)1980,JPO&Japio

Steel welding method

Abstract: PURPOSE:To weld a steel material to be welded by a welding material having a strength lower than the strength of said steel undergoing restraint by welding, to cool the same, and thereafter to heat the welded part and to subject the welded parts to aging thereby to increase the strength of the soft welding joint more than the strength of the material to be welded. CONSTITUTION:A steel material to be welded such as a structure steel or the like is welded by a welding material having a strength lower than that of the steel material. In this case, welding is carried out preferably by use of a shield gas prepared by mixing 0.2 to 5% by volume of a nitrogen gas into a gas consisting more than a member selected from the group consisting of argon, helium and a carbonic acid gas. Then, the welded steel is cooled, and thereafter the welded part is heated and held at a temperature in the range of from 200 to 300 deg.C and then subjected to aging.

Production of chrome plating steel sheet with excellent weldability

Abstract: PURPOSE: To obtain chrome plating steel sheet with excellent weldability by carrying out temper rolling of less than 20% to chrome plating steel plate. CONSTITUTION: In case temper rolling is carried out to the chrome plating steel sheet, and its surface is made to crack, a welding current flows to the base iron part through those innumerable cracks, and it is possible to perform good Soudronic welding, etc. On the other hand, other quality and performance are lowered by the aforesaid refining rolling, but so far as the screw-down rate of the temper rolling and the plating specification of chrome plating steel sheet are retatined within the proper range, the aforesaid deterioration can be disregarded as a matter of fact. Namely, as for the metallic chromium quantity of chrome plating steel sheet, 3W 150mg/m 2 are desirable, while as for the chromium oxide quantity, 2W30mg/m 2 are desirable as metallic chromium conversion value. Also, the suitable temper rolling rate is less than 20%, and preferably less than 5%. COPYRIGHT: (C)1980,JPO&Japio

Dehydrogenation apparatus for welding of slightly weldable materials

Abstract: PURPOSE:To obtain effective weld joint, by butting joint groove part of two difficult weldability tube and using the cover, covering the tube hole, inactive gas, vacuum apparatus, tightly sealed case and heating apparatus etc.

Martensite system stainless steel for structure with excellent weldability and workability

Abstract: PURPOSE: To obtain this martensite system stainless steel for structure with excellent weldability and workability that can be gained by each bringing the C and N content of the martensite system stainless steel not more than 0.02% and by limiting Ni content not more than 0.1%. CONSTITUTION: This martensite system stainless steel is that not more than 0.02% C, not more than 0.02% N, 1.0W3.5% Mn, not more than 1.0% Cu, not more than 0.10% Ni, 10W13.5% Cr and not more than 0.50% Si are contained and Cr equivalent expressed in the following expression in not more than 10.5. Cr equivalent=[%cr]+0.4×[%Si]-0.4×[%Mn]-0.7×[%Ni]-0.6×[%Cu]-35×[%C]-10×[%N]. :C and N% are lowered, Ni% is also limited less than 0.1%, strength as steel for structure is kept, shearing cracks at a pickling plate and working cracks after shearing are eliminated, Cr equivalent is brought to specified value, and the toughness and workability of welded portions are improved, thus obtaining this stainless steel that is optimum as steel for steel manufacturing and cheap. COPYRIGHT: (C)1980,JPO&Japio

Weldability of Formable Sheet Titanium Alloy - Ti-15V-3Cr-Al-3Sn

Abstract: : Gas-Tungsten-Arc (GTA) and Electron Beam (EB) fusion welding process parameters were established for Ti-15V-3Cr-3Al-3Sn alloy sheet in 0.050-, 0.100- and 0.300-inch thicknesses. The material, purchased from Timet, was characterized by mechanical testing in the following conditions: solution annealed and solution annealed and aged at 900 and 950 F for eight hours. Solution annealed material is very ductile and formable. Aging response of base metal shows that 150 to 170 ksi minimum yield strengths can be achieved. GTA and EB welds were made using a square butt joint configuration in the 0.050- and 0. 100-inch thickness. A 'V' joint configuration was used to weld 0.100-inch thick material wire using the GTA process. 0.300-inch material was welded with the EB process only. All weldments were made using production equipment and there were no anomalies in welding this material. X-ray and dye penetrant tests showed that weldments were crackfree and within porosity limits. Bend and tensile tests made on weldments in the as-welded condition were very ductile and compared favorably to the ductility of solution annealed base metal. Aging response of welded specimens, tensile tested in both longitudinal and transverse directions, was similar to base metal and properties compared favorably to base metal properties. Notched tensile strengths, fracture toughness, and crack growth rates all indicate that Ti-15V-3Cr-3Al-3Sn weldments are satisfactory for structural applications.

High chromium steel for high temperature member

Abstract: PURPOSE:To provide the title steel having superior oxidation resistance, high temp. strength and good weldability, and consisting of each specified amt. of C, Si, Mn, Cr, V, Nb, Mo and/or W and the balance Fe.

Mechanical Properties of Soviet and American Al-Mg Alloy Plates and Welds for LNG Systems

Abstract: The application of liquefied gases in modern engineering requires materials suitable for service at temperatures approaching absolute zero. Aluminum and its alloys are not susceptible to sharp ductile-to-brittle transition at low temperatures and their ultimate tensile strength and yield strength are higher at low temperatures than at room temperature. Elongation of most aluminum alloys increases or remains constant with decreasing temperature. In addition, many aluminum alloys, including the Al-Mg alloys, possess good weldability. Therefore, aluminum alloys are widely used in vessels for storing and transporting LNG and other structures subject to extremely low temperatures. Selection of materials for use in LNG systems can be made by evaluating the properties of aluminum alloys and their welded joints over the low temperature range.

High strength steel with excellent workability and weldability

Abstract: PURPOSE:To provide the title high strength steel with excellent surface properties comprising a case of a specified compsn. contg. C, Mn, Si and one or more out of Nb, V, Ti and Zr except Fe and a core of a compsn. of the above case compsn. to which a specified amt. of P has been added.

Mechanical Properties of U. S./USSR Al-Mg Plate and Welds for LNG Applications

Abstract: Aluminum-magnesium alloys have an excellent combination of weldability, strength, and corrosion resistance, as well as exceptionally high toughness at room and low temperatures [1–11]. For these reasons, Al-Mg alloys are widely used for critical cryogenic applications, including the storage and ocean transportation of liquefied natural gas (LNG) [12–15].

Stainless cast steel for cryogenic temperature use

Abstract: PURPOSE: To obtain a stainless cast steel which has an improved toughness against cryogenic temperatures and an excellent weldability, by adding C, Si, Mn, Ni, Cr and N in required amounts, respectively, and mixing a specified rate of ferrite phase into its austenite matrix CONSTITUTION: This stainless cast steel is formed from a 2-phases structure, in which ferrite phase of 3W30% is mixed into austenite matrix, so that its cracking rusceptibility at the time of welding may be reduced in a considerable degree Moreover, when the cast steel is welded, precipitation of Cr-carbide at the heat affected zone is restrained and it has been prevented that the cast steel becomes brittle when it is welded Martensite trasformation has also been prevented certainly at the same time The cast steel contains less than 008% of C, less than 2% of Si, less than 3% of Mn, 40W120% of Ni, 170W250% of Cr and 005W003% of N, and the rest is composed of Fe COPYRIGHT: (C)1980,JPO&Japio

Development of high-strength chromium-molybdenum rail steel with improved weldability

Abstract: Chromium-molybdenum (Cr-Mo) steel rails have been in trial service since 1975, and favorable reports have been received from all test locations. These Cr-Mo rails, containing nominally 0.75% C, 0.85% Mn, 0.75% Cr, and 0.18% Mo, exhibit life expectancy equal to that of head-hardened and fully heat-treated rails. Rails of this composition require a special flash-butt welding cycle to delay the cooling rate of the weld to provide a uniform heat-affected zone microstructure. In this study, the Cr-Mo rail steel composition was modified by reducing the manganese and chromium contents while maintaining the same as-rolled hardness. The heating and cooling cycles used for making conventional flash-butt welds in carbon-steel rails were applied to the modified Cr-Mo steels. It was found that a 0.75% C, 0.60% Mn, 0.60% Cr and 0.21% Mo steel has heat-affected zones which are virtually martensite-free under the conventional flash-butt welding conditions. This lean Cr-Mo rail steel composition appears to be well-suited for heavy duty rail production.

Metallic product and its manufacture and use

Abstract: PURPOSE:To manufacture metallic product, which is easily processed and blazed, and is excellent in weldability, and which gives final metallic product constituted of nonpreciptating solid solution of high strength and high electric conductivity by the solution treatment at a specific temp. of an alloy consisting of a specific quantity of Cr and Zr individually or in combination, the remainder being practically copper.

Low alloy steel with hydrogen stress cracking resistance

Abstract: PURPOSE:To provide the title low alloy steel contg. C, Si, Mn, P, S and Cu except Fe and inevitable impurities and having Rockwell hardness less than a specified value without deteriorating the low temp. toughness, weldability, or the like.

Production of ultralow carbon* 80 kg*mm2 high tensile steel plate

Abstract: PURPOSE:To obtain an 80 kg/mm high tensile steel plate with excellnt weldability at a low preheating temp. by limiting C to a very low level; increasing the amt. of Cu to be added; and adding a proper amt. rolling, quenching, and tempering.

Effects of impurities on the weldability of electroformed nickel

Abstract: The effect of impurities on weld cracking of electroformed nickel was studied using gas tungsten arc welding, varestraint testing and hot ductility testing. High purity electroformed nickel was found to be very resistant to weld cracking; furthermore, intentional additions of copper and iron to levels above those commonly observed in electrodeposits had no detrimental effects on welding. However, nickel electrodeposits with sulfur and lead impurities were found to exhibit increased susceptibility to weld cracking with increasing impurity content. High levels of carbon, oxygen, and nitrogen result in intergranular porosity of the weld heat affected zone and this leads to weld cracking resulting from locally reduced strength and ductility. Other cracking mechanisms resulting from impurities are proposed.

Production of high toughness high tensile steel

Abstract: PURPOSE:To produce a high tensile steel with excellent low temp. toughness and weldability by hot rolling a steel slab of a specified compsn. contg. C, Si, Mn, S, Al, Nb, and Mo at a specified total reduction ratio followed by annealing at temps. within a specified range and reheating treatment at temps. within a specified range.

Alloying method for zinc-plated steel sheet

Abstract: PURPOSE:To make zinc-plated surface into alloy, by zinc plating and heat treating a steel hoop which has been dull finished. CONSTITUTION:Steel hoop finished by cold rolling is dull worked to 0.8-2.5murms. Then the steel hoop is brought into a heating furnace, where its surface is cleaned, thereafter the steel hoop is plated with zinc on the surface in a hot dipping bath of zink. The amount of coated molten zinc is controlled to a constant value, and the hoop is heated to a temp. 450-1,000 deg.C to form a layer of Zn-Fe alloy. The plated alloy layer is excllent in weldability and adherability for coating medium.

Copper alloy products and manufacture thereof

Abstract: PURPOSE:To obtain copper alloy products of a non-precipitation type solid soln. having easy workability, good weldability and solderability by soln. heat treating a copper alloy contg. iron and cobalt of each predetermined amt. at a predetermined temp.