CN103882200A - Heat treatment technique for normalizing and tempering ZG35SiMn steel - Google Patents

Abstract

The invention relates to a heat treatment technique for normalizing and tempering ZG35SiMn steel. The technique is characterized by comprising the following steps: normalizing treatment: charging at lower than 300 DEG C, heating to 850-880 DEG C at a rate of at most 120 DEG C/hour, keeping the temperature for 1.5-2.5 hours, discharging and cooling in air; and tempering treatment: when discharging and cooling in air to 550-650 DEG C after the normalizing treatment, keeping the temperature in the furnace for 1.5-2.5 hours, discharging and cooling in air. The technique performs the heat treatment by combining the normalizing and tempering, combines the discharging and cooling in normalizing and heating in tempering into one procedure, and thus, has the advantages of short heat treatment time and energy saving.

Description

ZG35SiMn steel is carried out to the thermal treatment process of normalizing and tempering

Technical field

The present invention relates to thermal treatment process, particularly ZG35SiMn steel is carried out the thermal treatment process of normalizing and tempering.

Background technology

Existing ZG35SiMn normalizing+tempering curve technique as shown in Figure 1 and Figure 2, this thermal treatment process, first normalizing+tempering process thermal treatment is separately carried out, current consumption is large, heat treatment time is long, although reach standard through this process heat foundry goods mechanical property after treatment and metallographic structure, but production cost is very high.

Summary of the invention

Object of the present invention is merged into normalizing and tempering exactly a technique and heat-treats, and come out of the stove refrigerating work procedure and tempering heating process of normalizing is merged into a procedure, and heat treatment time is short, save energy ZG35SiMn steel is carried out to the thermal treatment process of normalizing and tempering.

Solution of the present invention is such:

A thermal treatment process of ZG35SiMn steel being carried out to normalizing and tempering, comprises step:

(1), normalizing treatment step: in 300 ° of C shove charges of <, be warmed up to 850 ° of C-880 ° of C by a heat-up rate≤120 ° C/h, insulation 1.5 h-2.5h, the air cooling of coming out of the stove;

(2), temper step: when the air cooling of coming out of the stove after normalizing treatment melts down insulation 1.5 h-2.5h, the air cooling of coming out of the stove during to 550-650 ° of C.

Advantage of the present invention is normalizing and tempering to be merged into a technique heat-treat, and come out of the stove refrigerating work procedure and tempering heating process of normalizing is merged into a procedure, and heat treatment time is short, save energy.

Brief description of the drawings

Fig. 1 is traditional normalizing process graphic representation.

Fig. 2 is traditional tempering process graphic representation.

Fig. 3 is normalizing and tempering process curve figure of the present invention.

Embodiment

A thermal treatment process of ZG35SiMn steel being carried out to normalizing and tempering, comprises step:

(1), normalizing treatment step: in 300 ° of C shove charges of <, be warmed up to 850 ° of C-880 ° of C by a heat-up rate≤120 ° C/h, insulation 1.5 h-2.5h, the air cooling of coming out of the stove;

(2), temper step: melt down insulation 1.5 h-2.5h in the time coming out of the stove air cooling to 600 ° C after normalizing treatment, the air cooling of coming out of the stove.

ZG35SiMn steel after above-mentioned thermal treatment, its mechanical property and metallographic structure reach standard.

Claims (1)

1. a thermal treatment process of ZG35SiMn steel being carried out to normalizing and tempering, is characterized in that: comprise step:

(1), normalizing treatment step: in 300 ° of C shove charges of <, be warmed up to 850 ° of C-880 ° of C by a heat-up rate≤120 ° C/h, insulation 1.5 h-2.5h, the air cooling of coming out of the stove;

(2), temper step: when the air cooling of coming out of the stove after normalizing treatment melts down insulation 1.5 h-2.5h, the air cooling of coming out of the stove during to 550-650 ° of C.

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