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Hydrogen embrittlement refers to the fact that after the steel absorbs and diffuses hydrogen atoms, the lattice structure is embrittlement, resulting in the material losing toughness, the tensile strength and ductility are significantly reduced, and the brittle fracture is more likely to occur.
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Cold-drawn seamless pipe is a kind of high-precision steel pipe formed by cold-drawn processing, because the inner wall and outer wall of the cold-drawn seamless pipe have no oxide layer, can withstand high pressure without leakage, high precision, high finish, cold bending without deformation, flaring, flattening without cracks, etc., so it is mainly used for the production of pneumatic or hydraulic components.
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Tempering is a heat treatment process in which a high-pressure boiler tube quenched into martensite is heated to a temperature below the critical point, held for an appropriate time, and then cooled to room temperature.