Modified T-200 Maraging Steel
Modified T-200 Maraging Steel
(OP)
I'm looking for a source for this type of maraging steel in resonable quantities 1000 lbs or less. This is standard T-200 Maraging Steel MIL-S-46850, Type III, Condition A1 except; chemical composition is modified as follows.
Cobalt .75% max
Titanium .6%-.8%
Charpy V-notch impact strength in the maraged condition needs to be 65 Foot-Pounds min. in the long. direction. at room temperature IAW with ASTM E23-82, Notched Bar Impact Testing of Metallic Materials.
We used to buy this from Allvac (teledyn/vasco) but they no longer can supply it. Any thoughts??? I'm also considering alternatives: 13-8 SUPER-TOUGH, AERMET 100,...??? Aermet doesn't really meet the impact strength and 13-8 Super-Tough might equally hard to procure as modified T-200. Any help would be appreciated.
Thank you.
Cobalt .75% max
Titanium .6%-.8%
Charpy V-notch impact strength in the maraged condition needs to be 65 Foot-Pounds min. in the long. direction. at room temperature IAW with ASTM E23-82, Notched Bar Impact Testing of Metallic Materials.
We used to buy this from Allvac (teledyn/vasco) but they no longer can supply it. Any thoughts??? I'm also considering alternatives: 13-8 SUPER-TOUGH, AERMET 100,...??? Aermet doesn't really meet the impact strength and 13-8 Super-Tough might equally hard to procure as modified T-200. Any help would be appreciated.
Thank you.





RE: Modified T-200 Maraging Steel
Either way, try tech assist at Cartech.
= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: Modified T-200 Maraging Steel
Can you think of an alloy which would have the following properties (equal or better) and is readily available (no large min. buys):
Ultimate Tensile Stress KSI: 210
Yield Stress KSI:205
Elongation %:14
Reduction in Area %:62-70
Charpy V-Notch LT (FT-LBS):81-95
Fatigue Endurance Limit (KSI):110
Fracture Toughness KSI-IN1/2:112-129
Hardness (HRC):43/47
Thanks
RE: Modified T-200 Maraging Steel
The other alloy system with both high strength and toughness is the Multiphase alloys from SPS (MP35N, MP159, MP98). They are like AerMet 100 (will meet the strength and toughness, probably not the Charpy). They won't be easy to obtain.
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Modified T-200 Maraging Steel
Any other ideas?
RE: Modified T-200 Maraging Steel
We are doing specialty tubing work for people and paying over $30/lb for strip.
I also am doubtful of you rimpact values. I can find a numbe rof alloys that meet the properties (custom 465 aged at 1000F), except for the impact. If you have the endurance limit and K1c what does the impact matter?
= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: Modified T-200 Maraging Steel
If we needed the min buy then we could probably live with the price. We will probably use 1000lbs for the next ten or twenty years. Point taken about redundany of charpy versus fracture toughness and sigma e. Had to dust of the fracture mechanics brain cells. I'm going to read up on custom 465. I just printed the alloy data sheet. Any other information to consider (warnings, when not to use this alloy, etc.). Do you know the availablity and min. buys for this alloy? I'll have to call carpenter for the final word but I thought perhaps you would know off hand.
Thanks.
RE: Modified T-200 Maraging Steel
Can it be slit from sheet?
= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: Modified T-200 Maraging Steel