Heat Treating ASTM A709 Grade A Steel

[Mm22]

If I know the standard of the steal I have let's say ASTM A709 grade A how do I determine the temperature and time necessary for any heat treatment to be done on it?

 

[berkeman]

Welcome to PF.

If I know the standard of the steal I have let's say ASTM A709 grade A how do I determine the temperature and time necessary for any heat treatment to be done on it?

I did a quick Google search on heat treating ASTM grade steel and got good hits. Here is one of the first ones:

https://www.asminternational.org/documents/10192/1849770/ACF180B.pdf

 

[erobz]

If I know the standard of the steal I have let's say ASTM A709 grade A how do I determine the temperature and time necessary for any heat treatment to be done on it?

"Heat treating" it is too general a term. What do you wish to accomplish with the treatment is the question you need answer. You need to determine what the alloying elements are in the steel, and there will be an associated Isothermal Transformation Diagram for the alloy. It will tell you which phase (phases) you will land in for a certain temperature/time combination. Different phases have different mechanical properties.

Thats about all I remember, but maybe it can be of some use.

 

[jrmichler]

When I search A709 steel, I get the following hit (among others):

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ASTM A709/A709M-21
An ASTM designation number identifies a unique version of an ASTM standard.
A0709_A0709M-21
A = Ferrous Metals
0709 = assigned sequential number
M = SI units
21 = year of original adoption (or, In the case of revision, the last year of last revision)

Standard Specification for Structural Steel for Bridges​

Abstract
This specification covers carbon and high-strength low alloy steel structural shapes, plates and bars, and quenched and tempered alloy steel for structural plates intended for use in bridges.
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The ASTM Specification A709 covers several grades of steel, some of which might not be heat treatable. In order to heat treat steel, you need to know the exact grade, what heat treatments are possible for that grade, the mechanical properties resulting from those heat treatments, and what mechanical properties are needed for your application.

What is your application?

 

[Baluncore]

... how do I determine the temperature and time necessary for any heat treatment ...

Are you annealing, bending or hardening ?
Is the structure an elastic or plastic design ?
Will you bolt the joints, or pre-heat or post-heat the welds ?