Heat treatment process for ribbon of 1/10mm*12mm steel measuring tape

Abstract

Aheat treatment process for a ribbon of a 0.1mm*12mm steel measuring tape comprises the following steps: A, discharging; B, quenching: the ribbon is heated in a continuous heating furnace which is 4000-5000 mm long, the furnace operates at the firebox temperature of 1000-1050 DEG C and the constant running speed of 140-180 mm / s, and methanol is dropped at an inlet of the heating furnace at the rate of 40-60 drops / min during advancing of the ribbon; the ribbon is cooled in a template; C, tempering: the ribbon is tempered in a continuous tempering furnace with length of 6000-8000 mm after being quenched by the template; D, blowing: the ribbon is blown cold with argon after being discharged from the furnace. With adoption of a hot quenching process, the ribbon subjected to quenching has both hardness and toughness, so that the mechanical properties of the material are further improved. The silvery white and bright surface of the ribbon at the room temperature is guaranteed by adopting argon blowing cooling.

Description

technical field [0001] The invention belongs to the field of heat treatment process quenching, and in particular relates to a heat treatment process for a 1 / 10mm×12mm steel tape. Background technique [0002] A steel tape measure is a relatively common measuring tool in life, and it is one of the commonly used tools in the family. Because it is easy to use, easy to carry, and can meet the measurement accuracy of various objects, it is widely used in many industries, especially the construction industry and decoration industry. When measuring the length of an object, one end of the steel tape is often fixed and then tightened. Steel tape, the tape protrudes from the scale shell, and the length value of the object can be read from the corresponding number marked on the steel tape tape. When the measurement is finished, the tape is pulled by the spiral spring in the scale shell. The tape is then coiled up in the ruler housing and protrudes out of the ruler housing again the ne...

AI Technical Summary

Problems solved by technology

At present, the heating temperature of the commonly used heat treatment process is 840~880 ℃. At this temperature, the material can be completely austenified, and lath martensite + acicular martensite can be obtained after quenching, but because the acicular martensite structure is hard and Brittle, which determines that the tape has a more obvious brittle feature

At the same time, because in the tempering process, the commonly used tempering furnace is mostly tempered in the air, the surface of the tape is susceptible to partial oxidation, and because the oxidized structure is different from the metal matrix structure, the deformation coefficient is also different. Similarly, in the process of repeated pulling of the steel tape, the oxidized surface is prone to produce small micro-cracks, which will expand into crack sources and significantly reduce the fatigue life of the tape