Non-quenched-tempered alloy structure steel for slide block of precision machine tool, manufacturing process thereof and application thereof

Abstract

The invention discloses non-quenched-tempered alloy structure steel for a slide block of a precision machine tool, a manufacturing process thereof and an application thereof to solve mechanical performance problems existing in present steel. A technical scheme of the structure steel of the invention is characterized in that: the structure steel comprises 0.31-0.36% of C, 0.50-0.70% of Si, 1.15-1.30% of Mn, 0.02-0.05% of V, 0.020-0.035% of S, equal to or less than 0.020% of P, and the balance Fe and inevitable impurities, wherein the total content of P+S is equal to or less than 0.045%; and mechanical performance indexes are characterized in that the tensile strength (Rm, MPa) is 650-740, the hardness (HBW) is 192-219 and the yield strength (R0.2,MPa) is not less than 400. According to the manufacturing process, an EAF+LF+VD refinement is adopted, 0.03% of V and 0.55% of Si are added to steel; the finishing temperature in the finish rolling is not greater than 850DEG C; and the temperature of the steel into a burial pit is not greater than 400DEG C. The structure steel of the invention has the following advantages: the tensile strength index and the hardness index are guaranteed, yield strength requirements are satisfied, the service life of the slide block is improved by 20-40%, and usage performance requirements of users are reached.

Description

technical field [0001] The invention relates to an alloy structural steel, in particular to a non-quenched and tempered alloy structural steel for precision machine tool sliders; the invention also relates to a manufacturing method and application of the non-quenched and tempered alloy structural steel. Background technique [0002] The slider of the precision machine tool is an important part of the machine tool. During the machining process, the tensile strength (Rm, MPa) of the material is required to be 650-740 and the hardness (HBW) is 192-219, which cannot be too high; at the same time, the yield strength (R P0.2 , MPa) is not less than 400 and cannot be too low. At present, although the materials produced by domestic and foreign iron and steel enterprises can meet the performance indicators of the user's tensile strength (physical inspection level is 678MPa) and hardness (physical inspection level is 195HBW), their yield strength (physical inspection level is 387Mpa) ...

AI Technical Summary

Problems solved by technology

At present, although the materials produced by domestic and foreign iron and steel enterprises can meet the performance indicators of the user's tensile strength (physical inspection level is 678MPa) and hardness (physical inspection level is 195HBW), their yield strength (physical inspection level is 387Mpa) is low; Through the evaluation of the microstructure of the material object, the volume fraction of pearlite is 63% to 67%, and the grain size is 6 grades; in practical applications, it cannot meet the user's requirements for steel processing performance and parts performance requirements