ASTM A387 Properties (Chem., Mech. & Rankings)

In this post I'll talk about and give details about ASTM A387. First let's describe it and then have a look at its material's properties.

What is ASTM A387?

ASTM A387 is a Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum.


Steel Plates, Sheets, and Strip for Pressure Vessels


This specification covers chromium-molybdenum alloy steel plates intended primarily for welded boilers and pressure vessels designed for elevated temperature service.

Ok let's start with ASTM A387 chemical composition.

Chemical Composition

Grade 5

C max.



0.30 - 0.60

P max.


S max.


Si max.



4.00 - 6.00


0.45 - 0.65

Learn more about chemical composition.

Now it's the mechanical properties turn:

Yield Strength

Grade 5

45 ksi (310 MPa) min.

Learn more about what is yield strength.

Tensile Strength

Grade 5

75 - 100 ksi (515 - 690 MPa)

Learn more about what is tensile strength.

Elongation (min.) 50 mm


Learn more about what is elongation.

Reduction of Area (min. %)


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 A387 currently ranks 60 in my yield strength index. This means there are other 59 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:



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 A387 Properties (Chem., Mech. & Rankings). Materials Blog. 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

A20/A20M Specification for General Requirements for⁣
Steel Plates for Pressure Vessels⁣
A370 Test Methods and Definitions for Mechanical Testing⁣
of Steel Products⁣
A435/A435M Specification for Straight-Beam Ultrasonic⁣
Examination of Steel Plates⁣
A577/A577M Specification for Ultrasonic Angle-Beam Examination⁣
of Steel Plates⁣
A578/A578M Specification for Straight-Beam Ultrasonic⁣
Examination of Rolled Steel Plates for Special Applications⁣
A1017/A1017M Specification for Pressure Vessel Plates,⁣
Alloy Steel, Chromium-Molybdenum-Tungsten⁣
2.2 AWS Specifications:⁣
A5.5/A5.5M Low-Alloy Steel Electrodes for Shielded⁣
Metal Arc Welding⁣
A5.23/A5.23M Low-Alloy Steel Electrodes and Fluxes for⁣
Submerged Arc Welding⁣
A5.28/A5.28M Low-Alloy Steel Electrodes and Rods for⁣
Gas Shielded Arc Welding⁣
A5.29/A5.29M Low-Alloy Steel Electrodes for Flux Cored⁣
Arc Welding⁣


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.

Materials: ASTM A387 Properties (Chem., Mech. & Rankings)
ASTM A387 Properties (Chem., Mech. & Rankings)
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