Heat treatment review

Heat treatment review jingle

--Mesh belt continuous furnace - quenching, tempering articles

1

Regional division

Heated hot zone

Different products are stored

2

Empty box inspection

Product switching every day

No residue at the bottom of the empty box

3

Loading weighing

Loading the wire must be weighed

Evenly flattened

4

Tempering delay

Quenching and tempering have intervals

If it is not continuous, how?

Interval time is set

Tempering delay is eliminated

5

Test items

Surface hardness

Metallographic organization daily çž…

Eddy current testing recommended investment

Hard cracks are all driven away

6

Sink concentration

Sink concentration is risky

Refractometer to check daily

Especially dephosphorization is the focus

Separate slots are recommended

7

Temperature control

Working thermocouples in various districts

Sink oil tank can not leak

Temperature fluctuations

±10°C heating zone

±5 °C tempering zone

Check the temperature big data

Field verification alarm

Cheap metal type is the mainstream

Regular replacement must have

Replace after heating for 1 year

Tempering for 2 years to be decisive

8

SAT (system accuracy test)

SAT air/load

Detection can be compared

Comparison of doubles in the same area

Once a month, I have to

If the detection method is used

Punch every quarter

9

TUS (furnace temperature uniformity test)

TUS plane method

According to the size difference of the furnace

Number of galvanic changes

If you ask how long to test

See you every year or after major repairs

10

Carbon potential control

Carbon potential oxygen probe

Data fluctuations are required

±0.05 upstream and downstream

Check the alarm function enough

Daily verification can't leak

Fixed carbon foil weighing method

Three-gas analysis direct measurement

The two methods are basically unbiased

Flow curing is not chaotic

Burning carbon in the furnace

Combined with protective gas nitrogen

Stable atmosphere effect

11

Oil tank control

Oil level and agitation

Alarm device continues to look

12

Oil detection

Oil performance is critical

Half year testing is to be achieved

13

Instrument verification

Temperature control carbon control and other instruments

Regular verification is not tricky

Remarks section:

*heat treatment

Heat treatment refers to a metal thermal processing process in which the material is heated, held, and cooled in the solid state to obtain the desired structure and properties. --Excerpt from Baidu

5, eddy current testing:

Principle: In an eddy current probe, an alternating current flows through the coil and produces an oscillating magnetic field. If the probe and its magnetic field are close to the conductive material of the metal test piece, the circular electron flow called eddy current will begin to move through the metal like the rotating water in the fluid. The eddy current flowing through the metal will in turn generate its own magnetic field, interacting with the coil and its field through mutual inductance. Defects such as large fluctuations in metal hardness or surface cracks will affect the impedance of the coil, interrupting or changing the amplitude and mode of the eddy current and the magnetic field it produces.

8, SAT (system accuracy test):

Comparison method: Compare uncontrolled readings of control and resident thermocouples (can be the same as control thermocouples or over-temperature thermocouples).

Detection method A:

Compare uncorrected temperature control system readings (control thermocouples, leads, control instruments) with corrected test temperature system readings (test thermocouples and test instruments).

Detection method B:

Compare uncorrected control thermocouple readings with corrected test temperature system readings (test thermocouples and test instruments).

9, TUS (furnace temperature uniformity test):

The uniform temperature characteristics, effective working area and operating temperature range of the furnace can be determined.

Temperature uniformity allows for maximum error: ±15 ° C for quenching furnaces and ± 10 ° C for tempering furnaces.

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