There are 6 specific reasons why 430 stainless steel pipe is not easy to weld: 1. High thermal conductivity: 430 stainless steel pipes have higher thermal conductivity compared to austenitic stainless steel. This means that they can dissipate heat more effectively, and maintaining the heat required for welding can be challenging. 2. Rapid cooling rate: 430 stainless steel pipes tend to experience rapid cooling rates during welding, especially in thicker sections. This rapid cooling can cause brittle phases such as martensite to form in the heat-affected zone, increasing the risk of cracking. 3. Sensitivity to hydrogen embrittlement: Ferritic stainless steel is more susceptible to hydrogen embrittlement during welding. The welding process introduces hydrogen into the material, which can cause the formation of hydrogen-induced cracks if not managed properly. 4. Sensitivity to hot cracking: 430 ferritic stainless steel is prone to hot cracking, especially in the presence of impurities such as sulfur and phosphorus. The welding process may introduce these impurities, and proper welding techniques (such as preheating and controlling the interlayer temperature) are essential to minimize the risk of hot cracking. 5. Limited ductility at low temperatures: 430 stainless steel exhibits reduced ductility at lower temperatures, and the welding process...
Processing is an important link that affects the quality of color-coated plates. In order to ensure product quality, some precautions during processing are given below for reference. Because color-coated plates have coatings on their surfaces, there are many differences between them and ordinary cold-rolled plates and coated plates during processing. The most important difference is that the forming process must be carried out under the premise of ensuring that the coating is intact. The precautions during processing are as follows: 1. Mechanical properties are an important indicator for measuring formability and an important parameter for determining and adjusting the processing technology. Therefore, they should be considered first during processing. 2. Indicators such as pencil hardness, T-bend, and impact energy are closely related to processing performance, so they should be fully considered. 3. When the shape of the parts is complex and the degree of deformation is large, multi-pass forming should be adopted. If formed in one time, the bonding force between the coating and the substrate may be destroyed due to excessive deformation. 4. During processing, the appropriate gap should be set according to factors such as mold shape, deformation characteristics, and process conditions. The thickness of the coating should...
First of all, the cold-drawn steel pipe uses a good tube blank and the process is good. The cold-drawn steel pipe extrusion method is to put the heated tube bad in a closed extrusion cylinder, and the perforating rod moves with the extrusion rod to extrude the extruded part from a smaller die hole. This method can produce steel pipes with smaller diameters. General-purpose seamless pipes are made of ordinary carbon structural steel, low-alloy structural steel or alloy structural steel, with a large output, and are mainly used as pipes or structural parts for conveying fluids. According to the purpose, cold-drawn pipes are divided into three categories: 1. Supply according to chemical composition and mechanical properties; 2. Supply according to mechanical properties; 3. Supply according to water pressure test. Steel pipes supplied according to the first two types, if used to withstand liquid pressure, must also be subjected to water pressure tests. Basic requirements for cleaning cold-drawn steel pipes: 1. Wear labor protection supplies before pickling cold-drawn steel pipes. The on-site...
Product materials: 10#, 20#, 35#, 45#, 20G, GB5310-95, St45.8-Ⅲ, 16Mn, 27simn, 15crmo, 35crmo, cr5mo, 40cr, 10crmo910, 12cr1mov, 12crmov, A335P22, DZ40, DZ50, N80, 15mnv, A335p91, 30crmnsi, etc. Execute international GB9948-2006 (20# petroleum cracking tube, 15CrMo petroleum cracking tube), GB8162-2008 (structural tube), GB8163-2008 (fluid tube), GB3087-2008 (low and medium pressure boiler tube), GB5310-2008 (high pressure boiler tube), GB6479-2000 (fertilizer special tube), GB5310-2008 (high pressure boiler tube), etc. Using petroleum cracking tube to manufacture annular parts can improve material utilization, simplify manufacturing process, save materials and processing time, such as rolling bearing rings, jack sleeves, etc., which are currently widely made of steel pipes. Petroleum cracking tubes are also indispensable materials for various conventional weapons. Gun barrels, cannon barrels, etc. must be made of petroleum cracking tubes. Petroleum cracking tubes can be divided into round tubes and special-shaped tubes according to the different cross-sectional shapes. Since the area of petroleum cracking tubes is larger under the condition of equal circumference, more fluid can be transported by using round tubes. ...
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