Carbon Steel Selection

The application and plate thickness will ultimately dictate the grade of material required but the yield strength indicates that you will probably need ultra high strength steel and a good starting point would be ASTM A605. A538 and A590 cover similar steels.

You can try looking at these suppliers found on GlobalSpec. Use the advanced search on the left to narrow the list. Good luck!

There is a lot of carbon steel plates which satisfy your requirements, e.g.

[ASTM A516 Grade 55, 60, 65 & 70] and [ASTM A285 Grade A, B & C], ..... etc.

Each grade have a chemical composition and mechanical properties differs from other grade of the same material.

For example,

a. The tensile strength of ASTM A516 Grade 70 is : 70-90 Ksi (485-620 MPa).

b. The tensile strength of ASTM A516 Grade 55 is : 55-75 Ksi (380-515 MPa).

And the allowable tensile strength of each grade at higher temp. is lower than at ambient. temp. Also, at very lower temps., the plates shall be impact tested.

Also, there are plates recommended in design and fabrication of pressure vessels such as ASTM 516 and ASTM 285, and other plates for structural work such as ASTM 283.

So you are requested to explain the design pressure and design temp., loading cases, and environment where that plate shall be used.

Good advice Abdel.

The original poster needs to convert his designation of yield strength to MPA or KSI if he is to make the proper selection.

I suspect that the requirement is indeed for plate, however cold drawn flat bars may be an alternative if this is for machine construction

Nice contribution.

milo

Not sure about the conversions but try spec: (shows yield at 51.7 ksi)

SAE J1392 050 (HSLA 950)

High strength steel-

I use this for stamping component in load path and they perform very well.

Good luck,

Lisa

As a note and probally another dicussion, (if applicable)

If you are reviewing heat treating, you may want to review any

potential for hydrogen embrittlement.

(vulnerable steels have a Rockwell hardness above C30)

Also you may want to review case hardening verses through.

Again, Good Luck!

Dear Lisa

That is just general information:

A. The material must be characterized by its allowable tensile strength at the ambient temp. So, for a material with 51.7 ksi, the allowable tensile strength at ambient temp. shall about 12.925 ksi by using a factor of safety = 4, other codes can use another factor of safety.

B. At elevated temp. the allowable tensile strength shall be reduced.

C. At very lower temp. and cryogenic temp. the impact test is required.

D. The allowable shear strength can be 45-75% of allowable tensile strength, depending on what code of design you fellow.

Thanks,,,

my application is very simple there is no elevated temp, sub-zero temp, no impact loading. Basically we are designing a fork, which is sbjected to bending load, right now we are using M.S. for trial which is bending. The component is having 6 mm thk & is produced by stamping.

Hence we are looking for a lmatl which is available in 6 mm thk (X 45 X 80), which can be stamped on 1 ton press & still give a yield stength of 100 kgf/sq mm (roughly , 1MPa = 10 kgf/sq mm). Preferrably the matl should have the strenght before hardening, but it is not possible we can go for thru hardening after stamping.

the matl I found on Matweb are -

AISI 4140, AISI4150, AISI 5160, AISI6150, AISI8640H, AISI8650,AISI9255.

It seems that these matl don't require hardening, they posses the required yield strength even before hardening. But I don'e know whether they are available in flat forms.

Pls comment.

My guess is whatever steel material you choose will deflect the same, regardless of heat treat yield strength.

Youngs modulus.

You need to work on your section design to gain rigidity.

my 2cents

milo "I had this discussion with a metallurgist from a european mill and he's still in denial, scratching his,,, nether regions."

Youngs modulus doesn't change with heat treatmment. But here we are talking about yield strength i.e. failure load (load that will cause permanent deformation). Yield point can be changed by different combination of alloying element & heat treatment.

Thats my point. Youngs modulus doesn't change.

You need a more rigid section. Design, not material.

I watched an " engineer" design and fabricate a reel holder for phone cable once upon a time. His customer gave him an empty reel. He designed based on the empty reel.

Put loaded reel on, and collapsed under weight.

HEat treated Second prototype. it failed too.

I guess having daddy give him a job title with 'engineer' in it didn't make up for the fact that he wasn't one...

I believe the issue is "section modulus" and that s why I beams have the shape that they do.

section modulus

The moment of inertia of the area of the cross section of a structural member divided by the distance from the center of gravity to the farthest point of the section; a measure of the flexural strength of the beam.

milo 'metallurgist, not structural engineer'