The 20G high-pressure boiler tube market, which had been fluctuating and consolidating, saw prices surge again, boosted by news, with a single-day price increase of 80-120 yuan/ton. The last time such a significant increase occurred was in early August, also driven by the coal-to-gas policy, marking
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1. Preheating Preheating helps reduce the peak hardness of the heat-affected zone (HAZ) of medium-carbon steel and prevents cold cracking. It is a key process measure for welding medium-carbon steel. Preheating also improves joint plasticity and reduces post-weld residual stress. Typically, the preh
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Due to the varying properties of seamless square tubes, the material exhibits different behaviors. Mechanical properties are based on static stress. Whether performing static tensile tests or hardness tests, the stress is applied slowly to the specimen or workpiece. However, in actual production, ma
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