38results about How to "Meet the tensile strength" patented technology

The laundry drum 1 is set up for removing water from wet laundry at high revolutions and has a circulating drum cover 2 which is bent from a thin-walled material strip to form a cylinder or flat truncated cone in such a way that the parallel end edges 3 and 4 of the material strip make contact in a connecting seam 5. In order that the laundry drum also withstands drum speeds above 1500 rpm in future, the end edges 3 and 4 have a crenellated toothing system 6 to 9, the teeth 6 and 7 of which engage in each case in the tooth gap 8 and 9 of the mating end edge in such a way that the base lines 11 of the tooth gaps 8, 9, butting against one another, form an at least approximately straight line and the teeth 6, 7 abut in the non-toothed region 8, 9 of the end edge 3, 4 outside the drum above the material strip and are connected fixedly there to the region 8, 9. Under a curved driver, the connecting seam 5 can also be curved in parallel.

The invention discloses a system for cooling a high-carbon steel wire rod after rolling. The device comprises a Stelmor controlled cooling device and a gas fog pre-heating device, wherein the gas fog pre-heating device is arranged on a roller path between a laying head and the Stelmor controlled cooling device. The invention further discloses a method for cooling a high-carbon steel wire rod after rolling. The method comprises the following steps of: controlling the temperature difference among different areas of a rod body to be below 100 DEG C by using the high thermal conductivity of convection vapor during gas fog pre-cooling; and entering the Stelmor controlled cooling device at the temperature of 650-750 DEG C for performing Stelmor cooling. Compared with a wire rod subjected to salt treatment, the finally obtained wire rod in the invention has the advantages that: the mechanical performance and microscopic structure are very close, the tensile strength of cold drawing can be met, and environmental pollution is greatly lowered.

The invention relates to the technical field of metallurgy, and particularly discloses a non-tempered N80 steel-grade petroleum casing pipe and a preparation method thereof. The non-tempered N80 steel-grade petroleum casing pipe comprises the following components in percent by weight: 0.28-0.32% of C, 0.25-0.40% of Si, 1.55-1.70% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.008% of S, 0.011-0.020% of Nb, 0.05-0.08% of V, 0.007-0.013% of Ti, 0.010-0.040% of Al, 0.013-0.017% of N, smaller than 0.10% of Cr, smaller than or equal to 0.10% of Ni, smaller than or equal to0.10% of Cu, smaller than or equal to 0.020% of As, smaller than or equal to 0.020% of Sn, smaller than or equal to 0.01% of Pb, smaller than or equal to 0.01% of Sb, smaller than or equal to 0.01% ofBi, smaller than or equal to 0.035% of Sn, As, Pb, Sb and Bi and the balance of Fe. Through component adjustment and technology optimization, design requirements on the tensile strength, the yield strength, the elongation and the impact energy of the N80 steel-grade petroleum casing pipe are met; the non-tempered N80 steel-grade petroleum casing pipe is stable in performance; compared with the tempering technology, the preparation method provided by the invention has the advantages as follows: the same quality requirements are met, the production process is shortened, energy is saved, the manufacturing cost is low, and the production efficiency is improved.

Provided are a steel sheet for a pressure vessel having excellent low-temperature lateral expansion, and a method for manufacturing the same. The steel plate for a pressure vessel according to the present invention contains, in wt%, 0.05% to 0.15% of C, 0.20% to 0.40% of Si, 0.3% to 0.6% of Mn, 0.015% or less of P, 0.015% or less of S, 0.02% to 0.10% of Al, 4.5% to 5.5% of Ni, 0.2% to 0.4% of Mo, 0.001% to 0.15% of Pd, and the balance of Fe and unavoidable impurities, and the steel sheet has a steel microstructure containing, in area fraction, 0.5% to 5.0% of retained austenite, 25% to 85% of tempered bainite, and the remainder of tempered martensite.

The invention discloses a manufacturing method of waterproof and antifreezing kraft paper. The method includes the technical steps of conducting beating, batching, wet paper sheet making, pre-drying,surface sizing, after-drying and the like on coniferous wood sulfate unbleached pulp. The invention aims to provide a manufacturing method of waterproof and antifreezing kraft paper, the obtained product has good tensile strength, outstanding bursting resistance, remarkable waterproof and antifreezing effects, can meet the packaging requirements of fresh cold chain food, completely solves the technical problems of no waterproofness and freezing protection performance in existing kraft paper, brings huge economic benefits to enterprises, and improves the enterprise competitiveness.

The invention discloses a cast iron continuous-cast section material and a manufacturing method thereof, in particular relates to an eutectic graphite grey cast iron continuous-cast section material and the manufacturing method thereof, and belongs to the field of the casting technique. The eutectic graphite grey cast iron continuous-cast section material is prepared from the following raw materials by mass percent: 3.40% to 3.60% of C, 2.4% to 2.9% of Si, 0.6% to 1.0% of Mn, 0.08% to 0.15% of P, less than or equal to 0.07% of S, 0.06% to 0.20% of Ti, 0.3% to 0.80% of Cu and 91.5% to 93% of Fe, wherein the total amount of the raw materials accounts for 100%. The prepared section material is excellent in surface roughness and free of generating shrinkage holes, shrinkage porosity and air holes. The structures, from the center to the edge, of the section material, are uniform and dense. The section material has the characteristics of being high in strength and uniform in hardness. The tensile strength and the uniformity of the section hardness of the material section disclosed by the invention are improved greatly.