摘要:
The invention relates to an internal high pressure shaping method for shaping metal tubes (5) produced from metal, especially steel, in a tool (1) that has a die cavity (2) with a complex contour. Said die cavity (2) has cylindrical sections (2a, 2b) on its two opposite ends. The tube which is conical across its entire length is inserted in such a die cavity in such a manner that it lies with its ends (5a, 5b) in the area of the cylindrical sections (2a, 2b). The sealing plugs force the ends (5a, 5b) against the cylindrical sections (2a, 2b), optionally while radially flaring them, so that they come to rest clamped between the wall of the cylindrical sections (2a, 2b) and the sealing plugs. The tube (5) is forced against the complex contour of the die cavity (2) by subjecting the tube (5) to an internal high pressure and simultaneous axial compression of the tube (5).
摘要:
This invention relates to a procedure for manufacturing cold-formed components (R) out of sheet steel and use of a sheet bar comprising the following steps: Generation of a sheet bar (P) out of a base plate (G), which consists of a first steel material; replacement of at least one section of the base plate (G) with a sheet steel blank (1, 2) whose thickness (D1, D2) or at least one material property differs from the first sheet steel (G), wherein the thickness (D1, D2) and/or deviating material property and the geometry of the sheet steel blank (1, 2) and its position in the sheet bar (P) are determined by the material flow during the ensuing cold forming process; and cold forming of the sheet bar (P) to fabricate the component (R). The procedure according to the invention ensures an improved result of cold forming, or even enables the manufacture of specific component shapes in the first place.
摘要:
A process for preparing a vacuum-treated steel for making forging ingots of great weight and high purity as required for rotors, turbine shafts, inductor shafts and other, usually annealed, large steel parts, which comprises: 1. Subjecting molten raw iron to blowing with oxygen and at least one slagging operation to form a foremetal containing 0.10 to 1 percent by weight carbon and less than 0.010 percent by weight phosphorus, at temperatures not exceeding 1650*C; 2. Separating said foremetal formed in step 1 from slag and directing an oxygen down-blast onto the surface of said molten metal while maintaining it molten to raise the temperature thereof to a temperature greater than 1700*C; 3. Simultaneous to said oxygen down-blast, injecting gas into said molten metal through at least one laterally disposed gas inlet terminating in a nozzle, the amount of gas being sufficient only to keep the nozzle free of said metal; 4. After said molten metal has reached a temperature in excess of 1700*C, discontinuing said oxygen down-blast; 5. Introducing an alloying component to said foremetal and increasing the injection of oxygen and inert gas to said molten metal; 6. Adding reducing agent to said molten metal; 7. Adding a desulfurizing agent to said molten metal to reduce sulfur content to less than 0.010 weight percent and introducing to said molten metal inert gas; and 8. Subjecting said molten metal to a vacuum treatment and teeming said molten metal.
摘要:
A PROCESS FOR MANUFACTURING AN UNANNEALED REINFORCING BAR STEEL FOR PRESTRESSED CONCRETE WHICH COMPRISES SUBJECTING A STEEL HAVING A COMPOSITION OF: 0.20-0.35 WEIGHT PERCENT CARBON 0.20-2.50 WEIGHT PERCENT SILICON 0.50-3.50 WEIGHT PERCENT MANGANESE 1.25-4.50 WEIGHT PERCENT CHROMIUM (MN+CR)=2.75-5.00 WEIGHT PERCENT, THE BALANCE CONSISTING ESSENTIALLY OF IRON BY COOLING IT IN QUIET AIR FROM THE HOT-ROLLED STATE WITH THE FORMATION OF BAINITE STRUCTURE AND, THEREAFTER, EITHER COLD DEFORMING IT PLASTICALLY WITHOUT ESSENTIAL INCREASE OF TENSILE STRENGTH AND TEMPERING THE SAME AT A TEMPERATURE IN THE RANGE OF 100 TO 400* C. OR TEMPERING IT IN THE TEMPERATURE RANGE BETWEEN 150 AND 550* C.
摘要:
A stainless semi-ferritic steel composition suitable for forming ribbing-free cold strip said steel composition having an austenite content of between about 10 and 40 percent, at temperatures above Ac1, said steel composition comprising: Up to 0.12 % by weight carbon 13-23 % BY WEIGHT CHROMIUM 0 - 2 % BY WEIGHT MOLYBDENUM 0-0.5 % BY WEIGHT NICKEL Up to a maximum of 1.0 % by weight silicon Up to a maximum of 0.35 % by weight manganese Up to a maximum of 0.010 % by weight sulphur 0.025-0.060 % BY WEIGHT PHOSPHORUS 0.020-0.060 % BY WEIGHT ARSENIC, AT LEAST 0.050 % OF SAID ARSENIC AND SAID PHOSPHORUS BEING COMBINED ARSENIC AND PHOSPHORUS, THE BALANCE BEING IRON PLUS OTHER COMMON IMPURITIES; A PROCESS FOR OBTAINING A SEMI-FERRITIC STAINLESS STEEL WHICH IS STILL AIR-HARDENING, SAID STAINLESS STEEL HAVING A AUSTENITE CONTENT OF BETWEEN 10 AND 40 PERCENT AT TEMPERATURES ABOVE Ac1 and capable of being cold rolled into a strip of slight thickness, which strip is characterized by being substantially non-washboarding, which process comprises utilizing as the steel composition the composition set forth above, maintaining the same at a temperature of between 700* and 780*C for between 2 and 10 hours, thereafter heating the same to a hot rolling temperature just below Ac1 and rolling down to the final hot rolling thickness, said steel composition being worked either as a crude ingot from the solidus temperature or in the form of a bloom in which it is worked from the cogging temperature.