ASTM Standard for AISI Materials

[Mechjj]

Dear Friends
I am working on some proposals for materials. I need references to use in the proposals. for some materials like inducers and diffusers of centrifugal pumps, ASTM Standards have clearly mentioned all requirements needed like chemical compositions and mechanical properties. But, for some materials, especially AISI materials (like 1045, 4140, ...), I have not found any standard giving all requirements. Although some standards like ASTM A29 have given the requirements of chemical composition, mechanical properties requirements (yield, tensile strength, hardness, ... ) have not been mentioned. Would you please help me to find out that in what standard I can find this data?

 

[EdStainless]

AISI named materials, and they haven't done that in over 30 years. They weren't material specifications.
If someone is quoting product with just an alloy name you should ask what the governing specs are.
There are ASTM specs for all of these alloys and product forms.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

 

[Mechjj]

Thanks for your reply.
As I said in ASTM A29 I can find the chemical composition of Grade 1045 and 4140, but could not find mechanical properties of them. Could you please tell me in what ASTM I can find the mechanical properties of them?

 

[EdStainless]

What is the product form? There are separate specs for bar, plate, tube, sheet and so on.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

 

[Mechjj]

For bars please.

 

[EdStainless]

Step 1. Join ASTM
Step 2. Ask for your free volume to be 1.03
Then you will have all of the steel bar and plate specs.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

 

[Mechjj]

Thanks/ I have access to it/ In which section I can find the mechanical properties of AISI 4140 and 1045?

 

[EdStainless]

Pull all of the steel bar specs and start working through them.
You are supposed to be able to search by alloy but your luck may vary, use both 4140 and G41400 as search terms.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

 

[mrfailure]

Lets start with the basics: AISI and almost identical SAE specifications were supplanted by the Unified Numbering System (UNS)system. It is important to note the the UNS (as well as the old AISI/SAE)standard only defined the allowable chemical composition, nothing more. They did not define compositional tolerance, or any mechanical properties.

You would be wise to purchase a current book of the UNS designations; they are available from ASTM and SAE. UNS designations for carbon and alloy steel start with a G and add a 0 to the end of the old AISI specs (e.g. G10450 and G41400). The UNS book cross-references ASTM (and other) specifications to the UNS alloy so this reference will allow you to find the correct specification for your needs. Good luck!

 

[bobjustbob]

4140 and 1045 or alloys with chemistries that meet these AISI designations may appear in multiple ASTM standards. The forming method, mechanical properties, and inspection change due to usage.

For example, a 1019 material could meet the requirements of multiple grades in ASTM A27, A148, A216, or A352 depending on how it is heat treated and inspected. Those are just the cast specs.

 

ASTM doesn't say much about AISI grades; I believe there may be one standard that references the entire list.
AISI is now passé and SAE now administers the standards for these alloys.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[Mechjj]

Thank all of you!
The materials I am looking their standard, are 1045 and 4140 for use as the shaft of a centrifugal pump. I am going to write special condition for the manufacturer, so I need a standard to refer to (for mechanical properties)

 

1045 and 4140 are two of the more popular choices for shafting. One important factor in the decision is the shaft diameter. As a generalization, smaller diameters require less alloy content to meet equivalent tensile properties.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."