Baosteel Special Metals Co., Ltd. (Baowu Group)

There are two classifications of stainless steel: one is divided into chrome stainless steel and chrome-nickel stainless steel according to the characteristics of alloy elements; the other is divided into M stainless steel, F stainless steel, and A stainless steel according to the organization state of the steel in the normalized state.A-F duplex stainless steel. Duplex Stainless Steel Pipe Duplex Stainless Steel Pipe  has good welding performance. Compared with ferritic stainless steel and austenitic stainless steel, it is not like the heat-affected zone of ferritic stainless steel. Due to the severe coarsening of grains, the plastic toughness is greatly reduced. It is not as sensitive to welding hot cracks as austenitic stainless steel. Due to its special advantages, duplex stainless steel is widely used in petrochemical equipment, seawater and wastewater treatment equipment, oil and gas pipelines, papermaking machinery and other industrial fields. In recent years, it has al

Duplex Stainless Steel Pipe  has good welding performance. Compared with ferritic stainless steel and austenitic stainless steel, it is neither like the heat-affected zone of ferritic stainless steel welding. Due to the severe coarsening of grains, plastic toughness is greatly reduced. It is not as sensitive to welding hot cracks as austenitic stainless steel. Stainless steel seamless pipe is a long steel with a hollow cross section and no seams on the periphery. The thicker the wall thickness of the product, the more economical and practical it is. The thinner the wall thickness, the higher the processing cost. The technology of this product determines its limited performance. Generally, the   Stainless Stainless Steel Tube  has low accuracy: uneven wall thickness, low brightness on the inside and outside of the tube, high fixed-length costs, and pits and black spots on the inside and outside, which are not easy to remove; its detection And shaping must be processed offline. Theref

Corrosion resistance of Stainless steel pipe ferritic (1) Uniform corrosion. Chromium is the most easily passivated element. In the atmospheric environment, iron-chromium alloys with chromium content above 12% can be self-passivated. In the oxidizing medium, the chromium content can be passivated above 17%. In some aggressive media, high chromium and adding molybdenum, nickel, copper and other elements can obtain good corrosion resistance. (2) Intergranular corrosion.  Stainless Steel Pipe Ferritic  is subject to the same intergranular corrosion as austenitic stainless steel, but sensitization and heat treatment to avoid this corrosion is just the opposite. Ferritic stainless steel is susceptible to intergranular corrosion when quenched from above 925 ℃, and the state susceptible to intergranular corrosion can be eliminated after a short time of tempering at 650 ~ 815 ℃ Intergranular corrosion in ferritic steel is also the result of chromium deficiency due to carbide precipitation

Duplex stainless steel pipe safety restrictions and requirements: 1. It is necessary to control the comparative example. The most suitable ratio is that the ferrite phase and the austenite phase are each half, and the number of one phase cannot exceed 65% at most, so as to ensure the best comprehensive performance. If the two ratios are out of tune, such as too many ferrite phases, it is easy to form a single-phase ferrite in the welded HAZ, which is sensitive to stress corrosion cracking in some media. Duplex Stainless Steel Pipe 2. It is necessary to master the organization transformation law of  Duplex Stainless Steel Pipe  and familiarize with the TTT and CCT transition curves of each steel grade. This is the key to correctly guide the process of heat treatment and thermoforming of duplex stainless steel. The precipitation of the brittle phase of duplex stainless steel should be More sensitive than austenitic stainless steel. 3. The continuous use temperature of the dupl

Stainless Steel Pipe Ferritic  is very unique in terms of model size and appearance. First, the thicker the wall of such stainless steel pipe, the higher the cost performance and practicality, and the thinner the pipe wall, the greater the processing cost. The increase, in addition, the performance limitation of the stainless steel tube depends on the processing technology. Generally, the precision of the seamless steel pipe is low, and the thickness of the pipe wall is not uniform, the brightness of the inner and outer surfaces of the pipe is low, and the cost of the fixed-length is relatively expensive. The surface is prone to pitting, black spots and is not easy to remove. In addition, the inspection and shaping of the precision stainless steel tube thick-walled tube must be processed offline. Therefore, the stainless steel pipe exhibits sufficient superiority in the field of high-pressure, high-strength mechanical structural materials. Stainless Steel Pipe Ferritic Stainless