Soft steel pipes are not recommended for heating applications because they are not able to withstand the high temperatures and pressure that are typically involved in heating systems. Soft steel pipes are more prone to corrosion and can easily deform or burst under the stress of heating. It is better to use pipes made of materials specifically designed for heating applications, such as stainless steel or copper, to ensure safety and efficiency. **

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One way to harden steel without heating it is through a process called cold working or cold forging. This involves deforming the steel at room temperature through processes such as rolling, hammering, or drawing. This causes the steel to become stronger and harder due to the internal stresses and dislocations created in the metal's structure. Another method is through a process called strain hardening, where the steel is subjected to plastic deformation, causing the dislocations in the crystal structure to increase, resulting in increased hardness. **

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To decommission a steel pipe used for heating, the first step is to shut off the heating system and allow the pipe to cool down completely. Next, drain any remaining water or heating fluid from the pipe. Once the pipe is empty, it should be disconnected from the heating system and any other connected pipes. Finally, the steel pipe should be properly cleaned and sealed to prevent any leaks or corrosion. **

Steel heating pipes do not rust on the inside because they are typically filled with hot water or steam, which creates an environment that is not conducive to rust formation. The high temperature of the water or steam helps to prevent the formation of rust by accelerating the evaporation of any moisture that may be present inside the pipes. Additionally, the constant flow of hot water or steam can help to remove any potential rust-causing impurities from the inside of the pipes, further reducing the likelihood of rust formation. Finally, many heating systems are treated with corrosion inhibitors to further protect the pipes from rust. **

Steel loses its hardness during heating at a temperature around 400-500 degrees Celsius, which is known as the critical temperature. At this temperature, the steel begins to lose its strength and hardness, becoming softer and more malleable. This process is known as tempering, and it is used to reduce the brittleness of the steel and improve its toughness. The color of the steel at this temperature can range from a light straw yellow to a dark blue, depending on the specific type of steel and the heating process used. **

To replace old steel heating pipes with copper pipes, you will first need to turn off the water supply to the heating system. Next, use a pipe cutter to remove the old steel pipes and clean the ends of the copper pipes that will be replacing them. Then, use soldering equipment to connect the copper pipes in place of the old steel pipes. Finally, test the new copper pipes for leaks before turning the water supply back on. It is recommended to consult a professional plumber if you are not experienced with this type of work. **