1: Thick-walled seamless steel pipe castability (castability): refers to the ability of metal materials to obtain qualified castings by casting. Casting properties mainly include fluidity, shortening and segregation. Fluidity refers to liquid metal filling molds. Capability, shortening refers to the degree of volume shortening when the casting is condensed. Segregation refers to the non-uniformity of the chemical composition and arrangement of the metal during the cooling and condensation process due to the difference in crystallization.
2: Thick wall seamless steel tube forgeability: refers to the metal material can change the shape without cracking during pressure processing. It can be hammered, rolled, stretched, twisted in hot or cold state. Pinch and other processing. The quality of forgeability is primarily related to the chemical composition of metal materials.
3: Thick-walled seamless steel pipe machinability (cuttability, machinability): refers to the ease with which a metal material becomes a qualified workpiece after being machined by a tool. The machinability is good and the surface roughness of the workpiece is usually processed. It is measured by the cutting speed and the degree of wear of the tool. It is related to many factors such as the chemical composition, mechanical function, thermal conductivity and degree of work hardening of the metal material. It is usually roughly judged by the hardness and the resistance for the machinability. Generally speaking, the higher the hardness of the metal material, the harder it is to cut. The hardness is not high, but the resistance is large and the cutting is difficult.
4: Weldability (weldability): refers to the customary function of metal materials for welding processing. Firstly, it refers to the difficulty of obtaining high-quality welded joints under certain welding process conditions. It contains two aspects: Combined function, that is, under certain welding process conditions, the certain metal constitutes the sensitivity of welding defects, and the second is the application of the function, that is, the certain metal welding joints have the applicability to the application requirements under certain welding process conditions.
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