ASTM A645 Properties (Chem., Mech. & Rankings)

In this post I'll talk about and give details about ASTM A645. First let's describe it and then have a look at its material's properties.

What is ASTM A645?

ASTM A645 is a Specification for Pressure Vessel Plates, 5% and 51 2% Nickel Alloy Steels, Specially Heat treated.

Category

Steel Plates, Sheets, and Strip for Pressure Vessels

Scope

This specification covers specially heat treated 5% and 5.1⁄2% nickel alloy steel plates intended primarily for welded pressure vessels for service at low or cryogenic temperatures.

Ok let's start with ASTM A645 chemical composition.

Chemical Composition

Grade B

C max.

0.13

Mn

0.90 - 1.50

P max.

0.020

S max.

0.010

Si

0.15 - 0.30

Ni

5.0 - 6.0

Cr

0.10 - 1.00

Mo

0.10 - 0.30

Al

0.02 - 0.05

N max.

0.010

Learn more about chemical composition.

Now it's the mechanical properties turn:

Yield Strength

Grade B

85 ksi (590 MPa) min.

Learn more about what is yield strength.

Tensile Strength

Grade B

110 - 120 ksi (690 - 830 MPa)

Learn more about what is tensile strength.

Elongation (min.) 50 mm

0.2.

Learn more about what is elongation.

Reduction of Area (min. %)

Not required.

Learn more about reduction of area.

Allowable Stress

Depends on the project (And its factor of safety).

Learn more about the what is allowable stress.

My Material's Rank

While engineers will often look for the cheapest material they can use, I took a different approach to material's selection to help newbie students.

I ranked materials according to their yield strengths and ASTM A645 currently ranks 15 in my yield strength index. This means there are other 14 materials that are more resistant.

Note: I've analysed 134 materials in order to create an yield strength index. Check my astm material's comparison post for more details.

ASTM Classroom

Are you having trouble understanding the basics of ASTM?

What is the difference between Code, Standard & Specification?

This video will walk you through:

References

Citation

When you need to include a fact or piece of information in an assignment or essay you should also include where and how you found that piece of information.

That gives credibility to your paper and it is sometimes required in higher education.

To make your life (and citation) easier just copy & paste the information below into your assignment or essay:

Luz, Gelson. ASTM A645 Properties (Chem., Mech. & Rankings). Materials Blog. Gelsonluz.com. dd mmmm. yyyy. <URL>

Now replace dd, mmmm and yyyy with the day, month, and year you browsed this page. Also replace URL for the actual url of this page (The < and > stay, ok?). This citation format is based on MLA.

Other References

A 20/A 20M Specification for General Requirements for⁣
Steel Plates for Pressure Vessels⁣

COMMENTS

Who is Gelson Luz anyway?


Gelson Luz is a Mechanical Engineer, expert in welding and passionate about materials. Search for "Gelson Luz" in your favorite browser to learn more.
Name

ASTM,171,Atomic-Mass,327,Atomic-Number,436,Atomic-Radius,86,Atomic-Symbol,329,Atomic-Volume,94,Boiling-Point,94,Chemical-Elements,100,Chemical-Symbol,217,Coefficient-of-Thermal-Expansion,85,Covalent-Radius,87,Crystal-Structure,109,Density,309,Elastic-Modulus,30,Electrical-Conductivity,79,Electro-Affinity,87,Electron-Configuration,109,Electronegativity,102,Electrons-per-Shell,112,Enthalpy-of-Fusion,93,Enthalpy-of-Vaporization,95,Group-Number,218,Heat-of-Fusion,87,Heat-of-Vaporization,85,Ionic-Radius,78,Ionization-Energy,102,Ionization-Potential,101,Melting-Point,96,Oxidation-States,104,Period-Number,107,Properties,38,Specific-Gravity,83,Specific-Heat,92,Specific-Weight,1,Tests,2,Thermal-Conductivity,105,Valence-Electrons,98,
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Materials: ASTM A645 Properties (Chem., Mech. & Rankings)
ASTM A645 Properties (Chem., Mech. & Rankings)
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