4results about How to "Good weldability" patented technology

The invention discloses low-C-high-Mn-Ni-Cu corrosion-resistant L555-grade subsea pipeline steel and a preparation method thereof, belongs to the technical field of subsea pipeline steel manufacturing, and aims to solve the technical problem that existing L555-grade pipeline steel is poor in corrosion resistance and low-temperature toughness. The low-C high-Mn-Ni-Cu corrosion-resistant L555-grade subsea pipeline steel provided by the invention is prepared from the following components in percentage by mass: 0.031 to 0.045 percent of C, 2.00 to 2.10 percent of Mn, 0.15 to 0.22 percent of Si, 0.60 to 0.80 percent of Ni, 0.31 to 0.40 percent of Cu, 0.15 to 0.20 percent of Cr, 0.020 to 0.030 percent of Nb, 0.010 to 0.015 percent of Ti, less than or equal to 0.008 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.004 percent of N and the balance of Fe and inevitable impurities. The L555-grade subsea pipeline steel provided by the invention has good corrosion resistance and low-temperature toughness, and is suitable for deepwater drilling riser main pipes and other pressure-bearing service components.

This utility model discloses a composite water-cooled plate for a battery tray and the battery tray itself. The composite water-cooled plate includes: a water-cooled channel plate with a recessed water channel groove on one side; and a water-cooled cover plate, which is a composite plate formed by a first plate layer and a second plate layer. The cover plate covers the water-cooled channel plate, and the first plate layer and the water-cooled channel plate are connected by resist welding. A cooling water flow channel for heat exchange is formed between the water-cooled channel plate and the water-cooled cover plate. This utility model, by using a water-cooled plate composed of stainless steel plate and steel-aluminum composite plate, increases the overall structural strength, solves the problem of poor structural strength in existing all-aluminum liquid cooling plates, improves its load-bearing capacity and the protection level of the battery tray, and ensures the safe operation of the battery pack.

The invention discloses a preparation method of corrosion-resistant L555-grade subsea pipeline steel, belongs to the technical field of subsea pipeline steel manufacturing, and aims to solve the problem that the strength, toughness and corrosion resistance of pipeline steel are difficult to synergistically improve due to insufficient tissue regulation and control capability in an existing L555-grade pipeline steel preparation method. The invention provides a preparation method of corrosion-resistant L555-grade subsea pipeline steel. The preparation method comprises the following steps: step 1, smelting and continuous casting process; step 2, controlling a rolling process; the method comprises the following steps: firstly, heating a continuous casting billet to 1180 + / -10 DEG C, and preserving heat for 30-60 minutes; step 3, a third-stage temperature control cooling process; the rolled plate blank is sequentially subjected to first-stage rapid cooling, second-stage medium-speed cooling-isothermal keeping stage and third-stage air cooling treatment; 4, the rolled subsea pipeline steel is subjected to online self-tempering treatment; the on-line self-tempering treatment process comprises the following steps: after cooling, carrying out on-line tempering treatment on the steel plate at 450-480 DEG C for 3-8 minutes. The corrosion resistance of the L555-grade subsea pipeline steel can be remarkably improved.

The invention discloses a method for producing H08A semi-killed low-silicon welding rod steel by adopting a small square billet process, and belongs to the technical field of ferrous metallurgy. The method comprises the four procedures of converter smelting, LF refining, continuous casting and rolling, by optimizing the technological parameters of all the procedures, precise control over the silicon content and effective removal of inclusions are achieved, and the product quality stability is improved; the sulfur content and the phosphorus content are both smaller than or equal to 0.030%, the inclusion rating is smaller than or equal to 1.5 grade, and the purity of the welding rod steel is improved; the silicon mass fraction is stabilized at 0.03-0.07%, and the problem that the welding performance is poor due to the fact that the silicon content in a traditional process exceeds the standard is solved.