ASTM A437 Properties⚙️ (Chem., Mech. & Rankings) rev. 2022

In this post I'll talk about and give details about ASTM A437. First let's describe it and then have a look at its material's properties.

What is ASTM A437?

ASTM A437 is a Specification for Stainless and Alloy-Steel Turbine-Type Bolting Specially Heat Treated for High-Temperature Service.

Category

Corrosion-Resisting and Heat-Resisting Steels

Scope

This specification covers stainless and alloy-steel bolting specially heat treated for high-temperature service, such as steam turbine, gas turbine, and similar uses.

Ok let's start with ASTM A437 chemical composition.

Chemical Composition

Grade B4B

C

0.20 - 0.25

Mn

0.50 - 1.00

P max.

0.025

S max.

0.025

Si

0.20 - 0.50

Ni

0.50 - 1.00

Cr

11.0 - 12.5

Mo

0.90 - 1.25

V

0.20 -0.30

W

0.90 - 1.25

Al max.

0.05

Ti max.

0.05

Tin max.

0.04

Learn more about chemical composition.

Now it's the mechanical properties turn:

Yield Strength

Grade B4B

105 ksi (720 MPa) min

Learn more about what is yield strength.

Tensile Strength

Grade B4B

145 ksi (1000 MPa) min.

Learn more about what is tensile strength.

Elongation (min.) 50 mm

0.13.

Learn more about what is elongation.

Reduction of Area (min. %)

0.3.

Learn more about reduction of area.

Hardness Requirements

B4B Bolts

331 HB max.

Learn more about what is hardness.

Impact Requirements

Grade B4B

14J min. At room temperature

Learn more about impact testing (charpy v notch).

Other properties:

Density

7480 - 8000 kg/m3 (around 7.9 g/cm3 or 0.285 lb/in3).

Learn more about density.

Elastic Modulus

180 GPa (26107 ksi) - 210GPa (30458 ksi).

Learn more about the Elastic Modulus.

Poisson's Ratio

Usually around 0.26 – 0.31.

Learn more about the poisson ratio.

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 A437 currently ranks 7 in my yield strength index. This means there are other 6 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.

Details and PDF

Instructions:

1. Go to this page.
2. Type the name of the standard you are looking for in the search box. Tip: Don't forget to include "ASTM" as a keyword.
3. Read the details about the standard or download the PDF.

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 A437 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

A962/A962M Specification for Common Requirements for⁣
Bolting Intended for Use at Any Temperature from Cryogenic⁣
to the Creep Range⁣
E292 Test Methods for Conducting Time-for-Rupture Notch⁣
Tension Tests of Materials⁣
E112 Test Methods for Determining Average Grain Size⁣