AMS 2750 rev E - Changes Detailed - Work In Progress



So...finished section 1 and 2...will post every section as soon as it's done...feel discuss...would like to have input from Nadcap / SAE / AMS / Heat Treaters.
Changes in bold
If marked re-written definition followed by text from rev D you need to consult your copy of the standard to see differences.
If marked "changes in bold" - the text is from rev E with changes marked.

The way I am doing it (my suggestion) is to print/scan the standard on legal format, landscape so that half of the page is the actual standard (on your left) and use the blank right side for notes.
It's easier for meetings and team reviews.

1.1 Identical to rev D
1.2 Identical to rev D
1.3 Identical to rev D
2. Identical to rev D
2.1 Additions to rev E
2.2 Definitions (were at 8.2 in rev D)
2.2.1 Was 8.2.1 - Identical to rev D
2.2.2 Was 8.2.2 - Identical to rev D
2.2.3 Was 8.2.3 - Identical to rev D
2.2.4 Was 8.2.4 - Identical to rev D
2.2.5 Was 8.2.5 - Identical to rev D
2.2.6 Was 8.2.7 - Identical to rev D
2.2.7 Was 8.2.8 - Identical to rev D
2.2.8 Was 8.2.9 - Identical to rev D
2.2.9 Was 8.2.10 - Identical to rev D
2.2.10 Was 8.2.11 - Identical to rev D
2.2.11 Was 8.2.12 - Identical to rev D
2.2.12 Was 8.2.13 - Identical to rev D
2.2.13 Was 8.2.14 - Identical to rev D
2.2.14 Was 8.2.15 - Identical to rev D
2.2.15 Re-written Definition
Was 8.2.16 - “Digital Instrumentation”: An instrument that presents process measurements in a digital display format. Typical examples are mechanical recorders with digital displays, digital indicators, controllers with digital displays, etc.

2.2.16 Was 8.2.17 - Identical to rev D

2.2.17 Elapsed Usage Time - NEW DEFINITION - not in rev D

2.2.18 Was 8.2.18 - Identical to rev D

2.2.19 Re-written Definition
Was 8.2.6 in rev D: “Catastrophic Failure of Survey Thermocouple”: The obvious failure of a survey thermocouple indicated by extreme high readings, extreme low readings, and/or erratic changes in readings.

2.2.21 Was 8.2.20 - Identical to rev D
2.2.22 Was 8.2.21 - Identical to rev D
2.2.23 Was 8.2.22 - Identical to rev D

2.2.24 Re-written definition
Was 8.2.23 in rev D - “Heat Sink”: A mass of material equivalent to the heat transfer characteristics of the thinnest section of the part being heat-treated. Heat sinks may be used during TUS (see

2.2.25 NEW DEFINITION. Note:month or monthly indicate a span of one month: day of actual month to same day of the next month (example: 29-31 January to 28 February; 31 March to 30April)

2.2.26 Was 8.2.24 - Identical to rev D

2.2.27 Was 8.2.25 - new in bold : Sensors that are attached to or in contact with production material, a representation of production material, or are buried in the load of production material and which supply temperature data of the production material to process instrumentation.

2.2.28 Was 8.2.26 - Identical to rev D
2.2.29 Was 8.2.27 - Identical to rev D
2.2.30 Was 8.2.28 - Identical to rev D
2.2.31 Was 8.2.29 - Identical to rev D
2.2.32 Was 8.2.30 - Identical to rev D
2.2.33 Was 8.2.31 - Identical to rev D
2.2.34 Was 8.2.32 - Identical to rev D

2.2.35 Was 8.2.33 Changes in bold :
OVER-TEMPERATURE INSTRUMENTATION: A separate sensor and instrument combination installed in the furnace, which is used to monitor any over-temperature occurrence and generate an alarm and/or cut back or shut down heat input. The purpose for this control is to protect material and/or the furnace from overheating.

2.2.20 Was 8.2.19 - Identical to rev D

2.2.36 Was 8.2.34 changes in bold:
PARTS HEAT TREATMENT: Heat treatment by a source other than the raw material producer. Product is tested to the requirements of the heat treat processing specification or to selected requirements of other specifications.

2.2.37 Was 8.2.35 - identical to rev D
2.2.38 Was 8.2.36 - identical to rev D
2.2.39 Was 8.2.37 - identical to rev D
2.2.40 Was 8.2.38 - identical to rev D
2.2.41 Was 8.2.39 - identical to rev D
2.2.42 Was 8.2.40 - identical to rev D

2.2.43 NEW DEFINITION - was not in rev D
2.2.44 Was 8.2.41 - identical to rev D
2.2.45 Was 8.2.42 - identical to rev D
2.2.46 Was 8.2.43 - identical to rev D
2.2.47 Was 8.2.44 - identical to rev D
2.2.48 Was 8.2.45 - identical to rev D
2.2.49 Was 8.2.46 - identical to rev D
2.2.50 Was 8.2.47 - identical to rev D
2.2.51 Was 8.2.48 - identical to rev D
2.2.52 Was 8.2.49 - identical to rev D
2.2.53 Was 8.2.50 - identical to rev D
2.2.54 Was 8.2.51 - identical to rev D

2.2.55 Was 8.2.52 in rev D - Changes in bold:
SECONDARY TEST INSTRUMENT: An instrument with calibration directly
traceable to a primary standard or reference standard and which is operated in a controlled test environment.

2.2.56 Was 8.2.53 - identical to rev D
2.2.57 Was 8.2.54 - identical to rev D
2.2.58 Was 8.2.55 - identical to rev D
2.2.59 Was 8.2.56 - identical to rev D
2.2.60 Was 8.2.57 - identical to rev D

2.2.61 Was 8.2.58 in rev D - Changes in bold:
STABILIZATION (also referred to as equalization, equilibrium, steady state or soaked condition): Furnace stabilization occurs when all control thermocouples are within the allowable TUS tolerance span and controllers are cycling and/or maintaining the desired temperature in each zone.
All survey thermocouples must be within the desired temperature range and must not be changing such that they may drift above or below the maximum or minimum temperature.

For unloaded furnaces: if the temperature readings of any TUS sensor exhibit an upward or downward trend that is not converging toward the set point the test period shall be extended as necessary until the trend is no longer evident.

For loaded furnaces: If a survey load is used during the TUS, some survey thermocouples may continue to rise in temperature and slowly approach the set temperature. This rise in temperature of survey thermocouples towards the set temperature meets the requirement for stabilization.

2.2.62 Was 8.2.59 - Identical to rev D
2.2.63 Was 8.2.60 - Identical to rev D
2.2.64 Was 8.2.61 - Identical to rev D
2.2.65 Was 8.2.62 - Identical to rev D
2.2.66 Was 8.2.63 - Identical to rev D
2.2.67 Was 8.2.64 - Identical to rev D
2.2.68 Was 8.2.65 - Identical to rev D

2.2.69 Was 8.2.66 - Identical to rev D
2.2.70 Was 8.2.67 - Identical to rev D
2.2.71 Was 8.2.68 - Identical to rev D
2.2.72 Was 8.2.69 - changes in bold
THERMAL PROCESSING EQUIPMENT: A term used to refer to any vessel (such as furnace, oven, freezer, liquid bath, etc.) used to process materials at controlled temperatures.
2.2.73 Was 8.2.70 - Identical to rev D
2.2.74 Was 8.2.71 - Identical to rev D
2.2.75 Was 8.2.72 - Identical to rev D
2.2.76 Was 8.2.73 - Identical to rev D
2.2.77 Was 8.2.74 - Changes in bold:
USE (of a thermocouple – e.g., and to One cycle of heating and cooling a thermocouple.
Sorin: reference in rev D was:

VACUUM FURNACE: A furnace capable of operation at any pressures lower than atmospheric pressure (760 mm Hg).

2.2.79 Was 8.2.75 - Identical to rev D


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What a great help - your efforts are noted and appreciated. I'll be checking back often to see more. :agree1:
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Sorin. You are a GOD!
Thanks for doing all this work and sharing it.
I can stop crying now!


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This area has many changes, too many for me to even try and compile here.

If you are inquiring to determine if you need to buy the new standard - you do. Changes are extensive.


I've finished a comparison of Rev E compared to Rev D. I've identified revised text in blue. Additions are in red. AMS 2750 Rev D text is identified in green. Hope it helps


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I've finished a comparison of Rev E compared to Rev D. I've identified revised text in blue. Additions are in red. AMS 2750 Rev D text is identified in green. Hope it helps

GAAAAAHHHH...Thank you so very much!!:thanx:

Friday the 13th, my butt...starting off as a very good day! I was asked for some information just the other day on Rev E and my stomach dropped.

Appreciated, have a great weekend.
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