heat treatment instruction

8/12/2019 Heat Treatment Instruction

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HEAT TREATMENT

GENERAL REQUIREMENTS

SPECIFICATIONNo

Revision: 1Date:

17/09/2005Page 1

CONTENT

1. HEAT TREATMENT EQUIPMENT1.1 Accuracy and uniformit y1.2 Loading / Unloading facili ties1.3 Loading / Unloading furnace1.4 Furnace floor1.5 Burner posi tion

2. PROCESS CONTROL2.1 Personnel2.2 Written Procedures2.3 Number of Thermocouples2.4 Thermocouple attachment2.5 Data recording

3. CALIBRATION3.1 Calibration of thermocouples3.2 Calibration of measuring equipment

4. DOCUMENTATION

4.1 Heat treatment instruction4.2 Heat treatment certificate4.3 Heat t reatment graph

REVISION OVERVIEW


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1. HEAT TREATMENT EQUIPMENT

1.1 Accuracy and uniformitySub-supplier shall prove the accuracy and uniformity of the heat-treatment equipment

used in the specific temperature-time range.For existing equipment, documented results of actual heat treatments performed in thepreceding year may be considered.

For new equipment, the accuracy and uniformity shall be measured on at least two testtreatments.

1.2 Loading / Unloading facilit ies.

Sub-supplier shall have suitable

means for loading / unloading bytransportation trucks, to minimizethe risk of damage of the castings.

1.3 Loading / Unloading o ffurnaces.

Furnace construction shall allow easyloading and unloading of the castings, tominimize risk of damage to the casting

and placing the castings in the furnaceproperly.

Castings shall be evenly distributed on thefurnace floor and in such a way that nodirect flame contact with the castings can

take place.No stacking of castings is allowed.


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1.4 Furnace Floor

The furnace floor shall be

levelled out to prevent distortionof the castings during heat-treatment.

Next figure shows an exampleof a non-sufficiently levelled

floor.

1.5 Burner posi tion.

Burner position shall be such that nodirect flame contact with the castingcan take place.

Oil burner.


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Mid section of the furnace allows for higher castings, as no burner has been installed

there.


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2. PROCESS CONTROL

2.1 PersonnelAll personnel performing heat treatments and temperature measurements shall be clearlyinstructed and qualified for these processes.

2.2 Written proceduresWritten procedures, relevant to the processes and documentation involved, shall be

available for reference at site.

2.3 Number of thermocouples

The number of thermo-couples to be used shall be adapted to the dimensions of thefurnace as well as the casting dimensions and distributed evenly over bottom and top

parts of the castings.Typical five couples are used, of which three couples are used for registeringtemperatures and two couples are used for control purposes.

2.4 Thermocouple attachment

A couple shall be in direct contact with the casting surface. No local welding is allowed.


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Temperatures measured, shall be recorded on a calibrated instrument, during the full heattreatment cycle.

Each measuring instrument shall have a calibration sticker showing instrument

identification number, date of last and next calibration.


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3. CALIBRATION

3.1 Calibration of Thermocouples

All thermo-couples used in theheat-treatment process arepurchased in a calibratedstate.

Thermo-couples can only beused in a relative short period

(average 30 treatments),

before couples are replaced.No risk for aging exists during

this period.


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3.2 Calibration of Measuring Instruments.Instruments used for measuring and/or registering temperatures shall be calibratedperiodically (yearly).

Calibration results shall be documented.


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Instruments used for calibration must be traceable to National Standards.

Each calibrated instrument shall be providedwith a calibration sticker, showing instrument

identification number, date of last and nextcalibration.


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4. DOCUMENTATION

4.1 Heat Treatment Instruction

A document called Shipping form accompanies the castings that have to be heat treated.This documents shows:

* Type, number and description of the casting;* Order number* Serial number

* Heat treatment specification number.


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4.2 Heat Treatment Certif icate

After heat treatment, a certificate confirming in figures the actual heat treatment conditions

of the batch is send to the customer.


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4.3 Heat Treatment GraphTo the heat treatment certificate the original heat treat graphs shall be added.


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heat treatment instruction

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