The properties of 10# seamless steel pipe mainly depend on the carbon content and microstructure of the steel. Under annealing or hot rolling, as the carbon content increases, the strength and hardness of the 10# seamless steel pipe increases, while the plasticity and impact toughness decreases (see figure). Poor weldability and cold bending.
Therefore, 10# seamless steel pipe used in engineering structure is usually limited in carbon content. The residual elements and impurity elements, such as manganese, silicon, nickel, phosphorus, sulfur, oxygen and nitrogen, also affect the properties of 10# seamless steel pipe. These effects sometimes reinforce each other and sometimes offset each other.
For example:
1. Sulfur, oxygen and nitrogen can all increase the hot brittleness of 10# seamless steel pipe, while appropriate manganese can reduce or partially offset its hot brittleness.
2. All the residual elements except manganese and nickel reduce the impact toughness of 10# seamless steel pipe and increase the cold brittleness.
3. In addition to sulfur and oxygen reducing strength, other impurity elements increase the strength of 10# seamless steel pipe to different degrees.
4. Almost all the impurity elements can reduce the plasticity and weldability of 10# seamless steel pipe.
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