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Creep properties AISI 4140

Creep properties AISI 4140

Creep properties AISI 4140

(OP)
Does anyone know where I can find graph or similar for creep properties of AISI 4140 or B16 type studs say up to 400C? Thanks

RE: Creep properties AISI 4140

Why not use the allowable stress value in ASME B&PV Code, Section II, Part D, Table 3 for SA 193 Grade B16? At 400 deg C (750 deg F) the allowable stress value is 20-22 Ksi depending on diameter for B16.

RE: Creep properties AISI 4140

(OP)
Thanks for that suggestion but in this case I am measuring the extension of the B16 stud in order to calculate the load using youngs modulus. I am concerned that if any creep occurs that may introduce error into the calculation. In effect I want to check there is no creep of any significance for a B16 stud operating below 400C so the load calc using youngs modulus remains correct.

RE: Creep properties AISI 4140

Well, the good news is that for this service temperature, time independent properties govern the selection of allowable stress when compared with creep or stress rupture below (see below)

(b) At temperatures in the range where creep and
stress rupture strength govern the selection of stresses,
the maximum allowable stress value for all materials is established
by the Committee not to exceed the lowest of the
following:
(1) 100% of the average stress to produce a creep
rate of 0.01%/1,000 hr
(2) 100Favg% of the average stress to cause rupture
at the end of 100,000 hr
(3) 80% of the minimum stress to cause rupture at
the end of 100,000 hr

Favg = multiplier applied to average stress for rupture
in 100,000 hr. At 1500°F and below, Favg = 0.67.
Above 1500°F, it is determined from the slope of
the log time‐to‐rupture versus log stress plot at
100,000 hr such that log Favg = 1/n, but it may
not exceed 0.67.

RE: Creep properties AISI 4140

(OP)
Thanks for the detail and information.

In your item (1) it mentions not to exceed [1]"100% of the average stress to produce a creep
rate of 0.01%/1,000 hr"

Any idea on how I find out the stress to produce that creep rate in AISI 4140 at 400C ?

May thanks.

RE: Creep properties AISI 4140

Find this publication

High-temperature property data: ferrous alloys

Front Cover
Michael F. Rothman, ASM International
ASM International, 1988 - Technology & Engineering - 463 pages

RE: Creep properties AISI 4140

(OP)
Thanks metengr for your great help. I will get that book.

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