If no other heat treatment is specified for the component on the drawing, then it is assumed whatever heat treat condition the component has when finished is acceptable. On the other hand, you could add a note stating something like "Rough machine all surfaces to within.XX" of final profile and heat treat Rc38-42 in accordance with AMS2759/1".
Full Answer
Should I call out quench and temper on the drawing?
You are paying for a quench and temper so you may as well call it out on the drawing. It is prudent even if you do not care about anything other than surface hardness. This is a significant issue if you are at lower hardnesses like Rc40.
What are the primary rules for drawing treatment specifications?
Primary rules: Rule 1.1: The specifications for drawing treatment have to be clear and coherent. It is better to go beyond in the demanded description rather than leave a possibility of interpretation at the performer of the treatment.
Is it prudent to specify quench and temper at RC60?
It is always prudent to specify the process. Spec should read quench and temper to Rc60. You are paying for a quench and temper so you may as well call it out on the drawing. It is prudent even if you do not care about anything other than surface hardness.
How to know the modes of drawing specification?
Choose from the list the treatment you want to know the modes of drawing specification Fill in the empty fields taking attention to the notes Copy & paste the complete specification in the drawing field respecting the chronological order of execution of the treatments from up to down
What is drawing in heat treatment?
The object of tempering or drawing is to reduce the brittleness in hardened steel and to remove the internal strains caused by the sudden cooling in the quenching bath. The tempering process consists in heating the steel by various means to a certain temperature and then cooling it.
Is heat treatment a finishing process?
Heat Treating techniques we employ include normalizing, annealing, tempering, quenching, and case hardening. Finishing can include any number of processes applied to the surface of your product to achieve your desired outcome. These include: Powder Coating.
Which process can be used to inspect heat treated parts?
Heat treatment verification methodsX-ray diffraction. The X-ray diffraction method enables measuring the absolute residual stress value and retained austenite content. ... Barkhausen noise analysis. ... Stresstech provides turnkey solutions for heat treatment verification and retained austenite measurements.
Is heat treatment followed after hardening?
Heat Treatment Steel: Hardening After hardening, you may need to temper the metal to remove some of the brittleness. To harden most steels, you would use the first two stages of heat treatment (slow temperature heat followed by soaking by a specified time to a uniform temperature), the third stage is different.
What are the 3 stages of heat treatment process?
Stages of Heat TreatmentThe Heating Stage.The Soaking Stage.The Cooling Stage.
What are the five basic heat treatment process?
Heat treatment techniques include annealing, case hardening, precipitation strengthening, tempering, carburizing, normalizing and quenching.
How do you design a heat treatment cycle?
Approach to Design of the Heat Treatment CycleSelection of austenizing temperature,Adequate soaking time for thermal homogenization of the component,Selection of appropriate quenching media to obtain required cooling rate,Cooling the component to the room temperature,Tempering temperature and time.
How many types of heat treatment are there?
4 TypesWhat are the 4 Types of Heat Treating Processes? Common types of heat treating methods include annealing, hardening, quenching, and stress relieving, each of which has its own unique process to produce different results.
Does heat treat change dimensions?
Experimental work has been done on many materials to show the effects of heat treatment on size change. The effects are different for every material grade. For example, a 3.15-inch cube of D-2 tool steel during hardening grew by 0.08% in one dimension, while shrinking in the other two dimensions.
Do you heat treat before or after machining?
Heat treatment is the first operation to consider after machining, and you might even consider machining pre-heat treated material.
Is heat treating and tempering the same?
Both heat treatments are used for treating steel, although annealing creates a softer steel that is easier to work while tempering produces a less brittle version that is widely used in building and industrial applications.
Why tempering is carried out after hardening?
Why Is Steel Tempered? Tempering steel after a hardening process allows for a middle ground of hardness and strength. This is achieved by allowing the carbon diffusion to occur within a steel microstructure. When steel is hardened, it can become excessively brittle and hard.
What are the primary rules of drawing treatment?
Primary rules: Rule 1.1: The specifications for drawing treatment have to be clear and coherent. It is better to go beyond in the demanded description rather than leave a possibility of interpretation at the performer of the treatment.
What is drawing specification 1.0?
Drawing Specifications 1.0 supports the Designer in the writing of the drawing specifications for heat, thermochemical, mechanical and surface treatments performed mainly on special structural steels. The adopted definitions are consistent with EN 10052 : 1995 Vocabulary of heat treatments terms for ferrous products.
What are the secondary rules of a cartouche?
Secondary rules: Rule 2.1: In the cartouche it has to be indicated the material, in terms of quality and dimensions with references to the specific product standards and the starting heat treatment condition. Rule 2.2: In the drawing field it has to be indicated the succession of the heat, thermochemical, mechanical and surface treatments in ...
