2226 results about "Stainless steel material" patented technology

This ferritic-austenitic duplex stainless steel material has a composition containing, in terms of mass, at most 0.100% of C, 0.05-1.50% of Si, 0.05-2.00% of Mn, 4.00-9.00% of Ni, at most 0.050% of P, at most 0.0040% of S, 23.0-30.0% of Cr, 0.100-0.250% of N, 0.01-2.00% of Cu, 0.50-2.50% of Mo, at most 0.100% of Al, and at most 0.200% of Nb, with the remainder consisting of Fe and impurities, wherein: a DF value represented by expression (1) of DF=7.2(Cr+0.8Mo+0.78Si)-8.9(Ni+0.03Mn+0.72Cu+22C+21N)-44.9 (in the expression, the element symbols represent the contents (mass%) of the respective elements) is 45.0-70.0; and an austenite phase satisfies relational expression (2) of (0.8Cr)2+2Ni+7Mo+30Cu+30N≥340 (in the expression, the element symbols represent the contents (mass%) of the respective elements).

Alloy elements are reasonably matched, N and nitrides are added to form elements such as tungsten W, vanadium V, niobium Nb, cobalt Co, rare earth RE and the like for microalloying smelting, a forged and rolled material finished product is subjected to proper heat treatment, and the stainless steel subjected to heat treatment has good heat treatment performance through metallographic observation. According to the stainless steel, nanoscale carbides are separated out in a solid solution state, and fine particles mainly containing nitrides are dispersed and separated out in crystals in a thermodynamic state, so that the material is strengthened and does not diffuse to a crystal boundary, and the room-temperature mechanical property and the high-temperature mechanical property of the material are greatly improved; and when the stainless steel material produced by the method is used for manufacturing related products, the thickness of the stainless steel material can be reduced, and the overall input of the stainless steel material is greatly reduced, so that the large-scale application of noble metal strategic resource nickel is saved, and the aims of saving resources, energy and investment are fulfilled.

The invention belongs to the technical field of nondestructive testing, and particularly relates to a full-matrix microscopic ultrasonic leakage defect three-dimensional reconstruction method. According to the leakage defect three-dimensional reconstruction method, precise positioning and three-dimensional shape reconstruction of tiny complex defects in the austenite thin-wall stainless steel material are achieved, and technical support is provided for leakage micropore detection and three-dimensional representation of the austenite thin-wall stainless steel material. The leakage micropore three-dimensional reconstruction method comprises the following steps: recording an A-Scan original signal and position information of each path point to obtain full-matrix microscopic ultrasonic data; taking the minimum envelope entropy as an optimization target, performing variational mode decomposition and reconstruction on the A-Scan original signal of each path point, and calculating to obtain an optimal solution of a variational model; performing two-dimensional mask extraction on the processed full-matrix microscopic ultrasonic data to generate C scanning images with different depths; extracting to obtain two-dimensional defect edge masks under different depths; and carrying out splicing and volume rendering on a two-dimensional defect edge masking result.

A high-strength stainless steel waterproof coiled material and a method for preparing same. The high-strength stainless steel waterproof coiled material sequentially comprises, from bottom to top, a stainless steel material, a first bonding layer, a waterproof layer, a second bonding layer, and an isolation film. The raw materials of the first bonding layer comprise the following components in parts by weight: 80-90 parts of butyl rubber, 10-30 parts of polypropylene, 20-30 parts of filler A, 12-18 parts of a tackifier, 0.2-0.5 part of a coupling agent, 8-12 parts of a softener, 1-2 parts of stannous chloride, 1-3 parts of a vulcanizing agent, and 2-3 parts of an accelerant. The tackifier is composed of polyurethane and o-ethoxyphenyl isocyanate. The first bonding layer and the second bonding layer have the same raw materials. The high-strength stainless steel waterproof coiled material solves the problems in existing stainless steel waterproof coiled materials that bonding and stripping strength are low, and bonding and stripping strength decline significantly after soaking in water.

A ferrite-austenite duplex stainless steel material having a composition containing, by mass, 0.001 to 0.050% of C, 0.01 to 0.50% of Si, 1.0 to 4.5% of Mn, 0.050% or less of P, 0.030% or less of S, 1.5 to 3.5% of Ni, 19.6 to 24.0% of Cr, 0.01 to 1.00% of Mo, 0.01 to 1.20% of Cu, 0.010 to 0.090% of N, less than 0.130% of C + N, and the balance of Fe and impurities. The ferrite-austenite duplex stainless steel material has a metal structure in which the value of Md represented by formula (1) is 50.0-150.0 DEG C and the austenite phase is 25-49 vol%. In addition, the value of Md, which is represented by formula (1), of the austenite phase is 35.0-100.0 DEG C. Md = 551-462 (C + N)-9.2 Si-8.1 Mn-29 (Ni + Cu)-13.7 Cr-18.5 Mo (1) In the formula, the element symbols represent the content (mass%) of each element.

The utility model relates to the technical field of grinding, in particular to a grinding device for processing rhizoma polygonati raw materials, which comprises a stainless steel grinding box, a grinding table for grinding rhizoma polygonati is arranged in the grinding box, and the bottom of the grinding table is connected with a discharging mechanism for discharging ground materials. The grinding table is composed of a first table body and a second table body, a first driving mechanism used for driving the second table body up and down is arranged on the inner wall of the bottom of the grinding box, and a second driving mechanism used for driving the second table body to rotate is arranged on the upper portion of the grinding box; the first driving mechanism comprises a driving roller rotationally arranged below the second table body, and a concave area is arranged on the surface of the driving roller. According to the polygonatum sibiricum grinding table, the to-be-ground polygonatum sibiricum materials at the end opening position of the grinding cavity can be conveniently drawn into the grinding cavity to be ground while the grinding effect of the grinding table is not affected, and therefore the grinding efficiency of the polygonatum sibiricum materials is further improved.