45results about How to "Reduced weldability" patented technology

The invention discloses a TC128GrB steel plate for an oil bath tank truck and a production method of the TC128GrB steel plate. The TC128GrB steel plate comprises the following components in percentage by weight: 0.14%-0.24% of C, 0.15%-0.50% of Si, 1.30%-1.65% of Mn, no more than 0.015% of P, no more than 0.005% of S, no more than 0.30% of Cu, 0.020%-0.10% of V, 0.005%-0.020% of Nb, no more than 0.020% of Ti, 0.020%-0.050% of Al, no more than 0.53% of Cev, and the balance of Fe and inevitable impurities, wherein Cev=C+Mn / 6+(Cr+Mo+V) / 5 +(Ni+Cu) / 15. The TC128GrB steel plate is high in carbon content, relatively low in microalloy content and low in cost; the strength and toughness are matched; the mechanical property of the steel plate can completely meet the standard requirements of steel for the tank truck on TC128GrB steel; and the TC128GrB steel plate has high surplus, and is low in added precious metal content, and low in production cost.

The invention discloses a CO2 gas protection welding process of 800 MPa high-strength steel. The CO2 protection welding process is characterized by comprising the following steps of: (1) machining a joint: machining an X-shaped groove on the joint; (2) using a solid welding wire with the diameter of 1.2 mm and the tensile strength of 800 MPa, wherein the solid welding wire comprises the followingchemical components in percentage by weight: 0.04-0.10% of C, 0.30-0.80% of Si, 1.30-2.0% of Mn, 0.40-1.0% of Ni, 0.20-0.50% of Cr, 0.20-0.60% of Mo, 0.30-0.80% of Cu, 0.05-0.20% of Ti, 0.002-0.010% of B, less than and equal to 0.020% of P, less than and equal to 0.015% of S, less than and equal to 0.03% of Als, and the balance of Fe and inevitable impurities; (3) setting a welding mode: adoptingCO2 gas protection welding and a DC power supply opposition method; and (4) welding: carrying out one-side welding with back formation on a first welding line, and then carrying out multilayer multipass welding, wherein interlayer temperature is less than and equal to 160 DEG C. The invention has the advantages of simple process, high operability and low welding energy consumption and welding cost and can be widely used for the technical fields of the gas protection welding of the high-strength steel.

The invention discloses a supporting base wearing plate. With shape memory alloy as a matrix, the outer surface of the matrix is provided with a Titanium-plated coat, and the outer surface of the Titanium-plated coat is provided with a coated film. Rigidity, yield strength, strength of extension and impact resistance of the shape memory alloy is improved by adding high purity neodymium rare earth elements; compared with iron nickel titanium molybdenum shape memory alloy with a same percentage of iron atom and molybdenum atom, the adopted shape memory alloy has higher strength and corrosion-resistant performance at a temperature of -150DEG to +150 DEG C; the adopted shape memory alloy can bear big load action, has high security coefficient and prolongs service life; the coated film arranged on the outermost layer can improve corrosion-resistant performance, solvent resistance and oil resistance of the material itself, and is suitable for being applied to a position in which service environment is complex such as a bearing, supporting base and the like. Among them, properties of the coated film are affected when titanium atom content is too low, while too high content causes inferior compactness, thus proper content needs to be controlled.

The invention relates to a low-cost smelting method of round steel, in particular to a low-cost smelting method for improving cutting performance of round steel for machinery. The method comprises a converter smelting procedure, an LF furnace external refining procedure and a bloom continuous casting procedure; the converter lime and limestone consumption is properly reduced to reasonably reduce the basicity of furnace slag to increase the converter terminal sulfur content; the converter tapping carbon content is properly increased; the reasonable tapping temperature is selected; and the furnace external refining process is optimized. The round steel for machinery, produced by the method, is simple in operation, low in cost, high in purity, excellent in cutting performance and excellent in casting property. Compared with a traditional process, the smelting method guarantees the sulfur content in a finished product, satisfies the cutting requirement of customers, reduces the production cost, and solves such technical difficulties as weak continuous casting performance, easy generation of nodules, low purity and unstable quality in traditionally produced easy-cut round steel for machinery.