Full Transcript:

What’s up guys? Michael – Michael Talks Metal here back for more metal madness!!! How about helping the channel w/a little support? Just a click here or there, subscribe here, or drop a like? Thanks, let’s do this! Our topic for today is another in our series on precipitation hardening types of stainless steel 17-4.  The AISI designation is Type 630 and the UNS designation for the chemical composition of this alloy is UNS S17400.

Capable of high strength and toughness after heat treatment and with the corrosion and oxidation resistance typical of stainless steels, 17-4 is one of the most common and commercially important of the PH stainless alloys.  It finds applications in a wide range of industries……..   from  aircraft and aerospace to chemical and petrochemical.

For aerospace applications, the alloy is aircraft quality where the cleanliness requirements of AMS 2301 are applicable or premium aircraft quality Consumable Electrode Melted (CEM) to AMS 2300.

For petrochemical sour gas applications, the double H1150 condition has NACE approval for sour gas service

As in all of the precipitation hardening stainless grades, it receives a solution anneal that is followed by an aging treatment to develop final properties.

Typical solution anneal is at 1900  fdeg F and then rapidly cooled to room temperature.

Aging temperatures are specified by the condition description:

The H900 condition  is aged at 900  deg F,  H1100 is aged at  1100 deg F, etc.

Aging  requires one hour at temperature for H900 and 4 hours when aged to other conditions..  Cooling rate after aging is an air cool.  The double H1150 condition is two 1150 deg four hour aging treatments.

 

Chemical Composition    UNS S17400

Carbon ………………………………………..  0.07 % Max

Manganese …………………………………..  1.00 % Max

Silicon ………………………………………….. 1.00 % Max

Phosphorus …………………………………..  0.04 % Max

Sulfur ……………………………………………. 0.03 % Max

Chromium ……………………………………… 15.00 – 17.50 %

Nickel ……………………………………………. 3.00 – 5.00 %

Copper ………………………………………….. 3.00 – 5.00 %

Columbium plus Tantalum  ……………….. ( 5 X C ) – 0.45 % *

Iron …………………………………………………  Balance

****Minimum is 5 times the actual carbon content of the alloy. For example if Carbon is .04%, then the CbTa minimum is .20 %.

 

Density  .280 lbs per cubic inch in the solution annealed condition

Minimum  Mechanical Properties:   H 900  condition –  Longitudinal

190,000 psi Tensile Strength

170,000 psi  Yield  Strength

10 % Elongation

35 % Reduction of Area

 

Specifications:

Bar and Forgings:   

AMS 5643 ( AMS 2301)

AMS 5622 (AMS 2300)

ASTM A 564

ASME SA 564

Plate:  

AMS 5604

ASTM A 693

ASME SA 693

 

But as we have told our viewers many times before, specifications and part requirements can add to or alter the information we have presented to you today….for the fifty second time in 53 weeks –  CHECK THE SPECS. Thank you for watching, don’t forget to check our site out at michlinmetals.com. Appreciate you tuning in, if you have made it this far and haven’t subscribed please consider doing so now, click here. If you have missed any of the previous videos, click here! See you next Thursday at 10am, I’m out!

 

For more information about 17-4 check out our material page.