Energy saving of SSAW steel pipe for transporting fluids

Date:2024-02-18Tags:SSAW steel pipe
Energy saving of SSAW steel pipe for transporting fluids

The conveying fluid pipe took advantage of the seasonal changes in the temperature drop in late autumn and took reasonable measures to start and stop the cooling tower operating fan and the axial flow fan used for cooling in the pump room, effectively reducing power consumption. According to calculations by the professional management department, this alone can reduce costs by nearly 100,000 yuan per month. In daily production operations, 15 cooling tower fans (sets) are running at full load at the same time, with a total power of up to 1600kW per hour, making it a veritable power consumer.


SSAW steel pipe


Since the steelmaking system and continuous casting system have special requirements for the supply of water medium, especially when smelting fine steel types, the control of the temperature difference of the water medium plays a vital role in stabilizing product quality and developing new steel types.

In addition, the changes in outdoor temperature can be used to reasonably start and stop the fan to achieve the purpose of reducing power consumption and saving energy. Actively contact each production line user point to gain an in-depth understanding of the specific requirements for water temperature, determine the most reasonable range, and achieve the purpose of reducing costs and increasing efficiency while meeting production needs. Make full use of the characteristics of seasonal changes and the decrease in outdoor temperature at night, and adopt the method of real-time tracking and detection of the temperature change data of the water medium transmitted by the personnel on duty at the production site, so as to adjust the operating fans in a timely manner and minimize the number of operating fans. Over the past week, the number of operating fans has been halved, as has power consumption.

Static pressure bursting strength of SSAW steel pipe

Through relevant comparative tests, it has been verified that the measured values of yield pressure and burst pressure of SSAW steel pipe and straight seam welded pipe are basically consistent with the theoretical values, and the deviations are close. But whether it is yield pressure or burst pressure, SSAW steel pipe is lower than straight seam welded pipe. The blasting test also shows that the circumferential deformation rate of the blast port of SSAW steel pipe is significantly greater than that of straight seam welded pipe. This confirms that the plastic deformation ability of SSAW steel pipe is better than that of straight seam welded pipe, and the blast opening is generally limited to one pitch. This is because the spiral weld plays a strong restraint on the expansion of the crack.

Defects to avoid when handling SSAW steel pipe

SSAW steel pipe plays a very important role in our lives. Based on the heat treatment process of SSAW steel pipe, the common defects of each process are introduced below.

(1) Defects generated during the heating process. For the heating process, heat treatment heating equipment and heating media must be selected. What happens or easily happens here is that the surface of the part will be affected by the oxidizing heating medium, and the heating temperature exceeds the process requirements. The austenite grains are too coarse and even the grain boundaries melt, which will seriously affect the appearance and internal quality of the parts. Therefore, in the actual process, feasible measures should be taken for such defect analysis.

(2) Defects caused when quenching small-diameter spiral tubes. The parts are cooled after heating and austenite homogenization to obtain the required structural and mechanical properties. At this time, the ideal cooling medium needs to be selected based on the material and specific hardness of the part. The ideal cooling medium is rapid cooling at high temperatures and slow cooling at low temperatures (3o0°C). Usually the cooling medium is air, water, oil (mineral oil, vegetable oil, etc.) 5% ~ 10% brine, 5% ~ 15% alkaline water, synthetic coolant, water quenching oil cooling, water quenching nitrate cooling, alkaline bath , nitrate bath, chloride salt bath, etc. The cooling performance of these cooling media is very different, especially for salt water, alkaline water, oil, alkali bath, nitrate bath, chloride salt bath, etc. If there is a problem the cooling medium performance will degrade (age) and if not detected in time it will become a significant source of defects. Insufficient hardness, soft spots, quenching cracks and poor deformation of quenched parts are common heat treatment defects.

(3) Defects that will occur during the tempering process. Parts are quenched to obtain a high-hardness quenched martensite structure or a slightly lower hardness lower bainite structure, but the structure at this time is unstable and its brittleness is very high. When used in production, it must be quenched and tempered to obtain the required structure and properties. Therefore, the tempering process parameters will have an important impact on the heat treatment quality of the parts, such as hardness, temper brittleness, temper cracks and other defects. Effective measures must be taken during the tempering process to avoid the above defects.

(4) The surface quenching defect is the overall heat treatment of the part, so that the inside and outside of the part can obtain the required hardness and requirements. The case hardening treatment is used only to harden the surface of the part and the core remains in its structural state before treatment. Therefore, surface quenching temperature, heating time, hardened layer depth, etc. will affect the heat treatment deformation and cracking, hardness level and service life of the parts.

(5) Chemical heat treatment defects of small diameter spiral tubes. The chemical heat treatment of the spiral tube is a heat treatment process that penetrates metal or non-metal atoms on the surface of the part to obtain the required surface properties (such as high wear). This process gives the part composite material dual functions and effects. However, if the process formula, process parameters, etc. are changed improperly, it will lead to deformation and cracking of parts, unqualified structure, unqualified hardness, etc. Therefore, full attention should be paid to the chemical heat treatment of parts, otherwise the parts will completely lose the significance of chemical heat treatment. The heat treatment of parts should be safe, economical and practical, and at the same time, a cool, clean and quiet working environment should be created.

The correct heat treatment process is the premise and foundation to ensure qualified heat treatment quality of parts. Once the above quality problems are discovered, they can be solved from people, machines, materials, methods, links and inspections. Through analysis and judgment, the root cause of the defect can be found.


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